Extracting prog: 5m47.620982609s
Minimizing prog: 56m13.23485296s
Simplifying prog options: 16m56.046553495s
Extracting C: 5m14.298038843s
Simplifying C: 0s


extracting reproducer from 1 programs
testing a last program of every proc
single: executing 1 programs separately with timeout 6m0s
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$ndb-ioctl$NBD_SET_SIZE_BLOCKS-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_DO_IT
detailed listing:
executing program 0:
r0 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x0)
ioctl$NBD_SET_SIZE_BLOCKS(r0, 0xab07, 0x3)
r1 = syz_open_dev$ndb(&(0x7f00000001c0), 0x0, 0x0)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000080)={<r2=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r1, 0xab00, r2)
ioctl$NBD_DO_IT(r1, 0xab03)

program crashed: INFO: task hung in bdev_release
single: successfully extracted reproducer
found reproducer with 6 syscalls
minimizing guilty program
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$ndb-ioctl$NBD_SET_SIZE_BLOCKS-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK
detailed listing:
executing program 0:
r0 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x0)
ioctl$NBD_SET_SIZE_BLOCKS(r0, 0xab07, 0x3)
r1 = syz_open_dev$ndb(&(0x7f00000001c0), 0x0, 0x0)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000080)={<r2=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r1, 0xab00, r2)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$ndb-ioctl$NBD_SET_SIZE_BLOCKS-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_DO_IT
detailed listing:
executing program 0:
r0 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x0)
ioctl$NBD_SET_SIZE_BLOCKS(r0, 0xab07, 0x3)
r1 = syz_open_dev$ndb(&(0x7f00000001c0), 0x0, 0x0)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000080))
ioctl$NBD_DO_IT(r1, 0xab03)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$ndb-ioctl$NBD_SET_SIZE_BLOCKS-syz_open_dev$ndb-ioctl$NBD_SET_SOCK-ioctl$NBD_DO_IT
detailed listing:
executing program 0:
r0 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x0)
ioctl$NBD_SET_SIZE_BLOCKS(r0, 0xab07, 0x3)
r1 = syz_open_dev$ndb(&(0x7f00000001c0), 0x0, 0x0)
ioctl$NBD_SET_SOCK(r1, 0xab00, 0xffffffffffffffff)
ioctl$NBD_DO_IT(r1, 0xab03)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$ndb-ioctl$NBD_SET_SIZE_BLOCKS-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_DO_IT
detailed listing:
executing program 0:
r0 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x0)
ioctl$NBD_SET_SIZE_BLOCKS(r0, 0xab07, 0x3)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000080)={<r1=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(0xffffffffffffffff, 0xab00, r1)
ioctl$NBD_DO_IT(0xffffffffffffffff, 0xab03)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$ndb-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_DO_IT
detailed listing:
executing program 0:
syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x0)
r0 = syz_open_dev$ndb(&(0x7f00000001c0), 0x0, 0x0)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000080)={<r1=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r0, 0xab00, r1)
ioctl$NBD_DO_IT(r0, 0xab03)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): ioctl$NBD_SET_SIZE_BLOCKS-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_DO_IT
detailed listing:
executing program 0:
ioctl$NBD_SET_SIZE_BLOCKS(0xffffffffffffffff, 0xab07, 0x3)
r0 = syz_open_dev$ndb(&(0x7f00000001c0), 0x0, 0x0)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000080)={<r1=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r0, 0xab00, r1)
ioctl$NBD_DO_IT(r0, 0xab03)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$ndb-ioctl$NBD_SET_SIZE_BLOCKS-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_DO_IT
detailed listing:
executing program 0:
r0 = syz_open_dev$ndb(0x0, 0x0, 0x0)
ioctl$NBD_SET_SIZE_BLOCKS(r0, 0xab07, 0x3)
r1 = syz_open_dev$ndb(&(0x7f00000001c0), 0x0, 0x0)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000080)={<r2=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r1, 0xab00, r2)
ioctl$NBD_DO_IT(r1, 0xab03)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$ndb-ioctl$NBD_SET_SIZE_BLOCKS-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_DO_IT
detailed listing:
executing program 0:
r0 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x0)
ioctl$NBD_SET_SIZE_BLOCKS(r0, 0xab07, 0x3)
r1 = syz_open_dev$ndb(0x0, 0x0, 0x0)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000080)={<r2=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r1, 0xab00, r2)
ioctl$NBD_DO_IT(r1, 0xab03)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$ndb-ioctl$NBD_SET_SIZE_BLOCKS-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_DO_IT
detailed listing:
executing program 0:
r0 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x0)
ioctl$NBD_SET_SIZE_BLOCKS(r0, 0xab07, 0x3)
r1 = syz_open_dev$ndb(&(0x7f00000001c0), 0x0, 0x0)
socketpair$nbd(0x1, 0x1, 0x0, 0x0)
ioctl$NBD_SET_SOCK(r1, 0xab00, 0xffffffffffffffff)
ioctl$NBD_DO_IT(r1, 0xab03)

program did not crash
extracting C reproducer
testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$ndb-ioctl$NBD_SET_SIZE_BLOCKS-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_DO_IT
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
simplifying guilty program options
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$ndb-ioctl$NBD_SET_SIZE_BLOCKS-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_DO_IT
detailed listing:
executing program 0:
r0 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x0)
ioctl$NBD_SET_SIZE_BLOCKS(r0, 0xab07, 0x3)
r1 = syz_open_dev$ndb(&(0x7f00000001c0), 0x0, 0x0)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000080)={<r2=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r1, 0xab00, r2)
ioctl$NBD_DO_IT(r1, 0xab03)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$ndb-ioctl$NBD_SET_SIZE_BLOCKS-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_DO_IT
detailed listing:
executing program 0:
r0 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x0)
ioctl$NBD_SET_SIZE_BLOCKS(r0, 0xab07, 0x3)
r1 = syz_open_dev$ndb(&(0x7f00000001c0), 0x0, 0x0)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000080)={<r2=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r1, 0xab00, r2)
ioctl$NBD_DO_IT(r1, 0xab03)

program crashed: INFO: task hung in bdev_release
extracting C reproducer
testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$ndb-ioctl$NBD_SET_SIZE_BLOCKS-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_DO_IT
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$ndb-ioctl$NBD_SET_SIZE_BLOCKS-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_DO_IT
detailed listing:
executing program 0:
r0 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x0)
ioctl$NBD_SET_SIZE_BLOCKS(r0, 0xab07, 0x3)
r1 = syz_open_dev$ndb(&(0x7f00000001c0), 0x0, 0x0)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000080)={<r2=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r1, 0xab00, r2)
ioctl$NBD_DO_IT(r1, 0xab03)

program crashed: INFO: task hung in bdev_release
validation run: crashed=true
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$ndb-ioctl$NBD_SET_SIZE_BLOCKS-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_DO_IT
detailed listing:
executing program 0:
r0 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x0)
ioctl$NBD_SET_SIZE_BLOCKS(r0, 0xab07, 0x3)
r1 = syz_open_dev$ndb(&(0x7f00000001c0), 0x0, 0x0)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000080)={<r2=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r1, 0xab00, r2)
ioctl$NBD_DO_IT(r1, 0xab03)

program crashed: INFO: task hung in bdev_release
validation run: crashed=true
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$ndb-ioctl$NBD_SET_SIZE_BLOCKS-syz_open_dev$ndb-socketpair$nbd-ioctl$NBD_SET_SOCK-ioctl$NBD_DO_IT
detailed listing:
executing program 0:
r0 = syz_open_dev$ndb(&(0x7f0000000000), 0x0, 0x0)
ioctl$NBD_SET_SIZE_BLOCKS(r0, 0xab07, 0x3)
r1 = syz_open_dev$ndb(&(0x7f00000001c0), 0x0, 0x0)
socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000000080)={<r2=>0xffffffffffffffff})
ioctl$NBD_SET_SOCK(r1, 0xab00, r2)
ioctl$NBD_DO_IT(r1, 0xab03)

program crashed: INFO: task hung in bdev_release
validation run: crashed=true
reproducing took 1h36m32.267235665s
repro crashed as (corrupted=false):
INFO: task syz.0.17:5918 
INFO: task syz.0.17:5918 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.17        state:D stack:25768 pid:5918  tgid:5918  ppid:5750   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x16d9/0x5700 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7668
 rt_mutex_slowlock_block+0x55e/0x690 kernel/locking/rtmutex.c:1670
 __rt_mutex_slowlock kernel/locking/rtmutex.c:1747 [inline]
 __rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1787 [inline]
 rt_mutex_slowlock+0x2d4/0x780 kernel/locking/rtmutex.c:1827
 __rt_mutex_lock kernel/locking/rtmutex.c:1842 [inline]
 __mutex_lock_common kernel/locking/rtmutex_api.c:562 [inline]
 mutex_lock_nested+0x168/0x1d0 kernel/locking/rtmutex_api.c:580
 bdev_release+0x1be/0x690 block/bdev.c:1173
 blkdev_release+0x15/0x20 block/fops.c:687
 __fput+0x41f/0xa80 fs/file_table.c:512
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
 exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff18aa9e1d9
RSP: 002b:00007fff2920aad8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ff18ad27da0 RCX: 00007ff18aa9e1d9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007ff18ad27da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007ff18ad27cb0 R11: 0000000000000246 R12: 000000000002e7ce
R13: 00007ff18ad25fac R14: 000000000002e4c3 R15: 00007fff2920abe0
 </TASK>
INFO: task syz.0.17:5919 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.17        state:D stack:27264 pid:5919  tgid:5918  ppid:5750   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x16d9/0x5700 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7668
 rt_mutex_slowlock_block+0x55e/0x690 kernel/locking/rtmutex.c:1670
 __rt_mutex_slowlock kernel/locking/rtmutex.c:1747 [inline]
 __rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1787 [inline]
 rt_mutex_slowlock+0x2d4/0x780 kernel/locking/rtmutex.c:1827
 __rt_mutex_lock kernel/locking/rtmutex.c:1842 [inline]
 __mutex_lock_common kernel/locking/rtmutex_api.c:562 [inline]
 mutex_lock_nested+0x168/0x1d0 kernel/locking/rtmutex_api.c:580
 bdev_release+0x1be/0x690 block/bdev.c:1173
 blkdev_release+0x15/0x20 block/fops.c:687
 __fput+0x41f/0xa80 fs/file_table.c:512
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
 exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff18aa9e1d9
RSP: 002b:00007ff18a0fe028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007ff18ad25fa0 RCX: 00007ff18aa9e1d9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000004
RBP: 00007ff18ab35888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff18ad26038 R14: 00007ff18ad25fa0 R15: 00007fff2920a978
 </TASK>

Showing all locks held in the system:
locks held by kworker/0:1/10: 3, on CPU#0:
 #0: ffff88813ff2b938 ((wq_completion)events){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff88813ff2b938 ((wq_completion)events){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff88813ff2b938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #0: ffff88813ff2b938 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #1: ffffc900000f7c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc900000f7c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc900000f7c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #1: ffffc900000f7c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #2: ffff888028174280 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x222/0x3e0 drivers/net/netdevsim/fib.c:1490
locks held by kworker/u8:0/12: 10, last CPU#1:
 #0: ffff88813ff64138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff88813ff64138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff88813ff64138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #0: ffff88813ff64138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #1: ffffc90000117c40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc90000117c40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc90000117c40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #1: ffffc90000117c40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #2: ffff888057bba310 (&devlink->lock_key#11){+.+.}-{4:4}, at: nsim_dev_trap_report_work+0x57/0xcb0 drivers/net/netdevsim/dev.c:834
 #3: ffff88802b632120 (&nsim_trap_data->trap_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
 #3: ffff88802b632120 (&nsim_trap_data->trap_lock){+.+.}-{3:3}, at: nsim_dev_trap_report drivers/net/netdevsim/dev.c:787 [inline]
 #3: ffff88802b632120 (&nsim_trap_data->trap_lock){+.+.}-{3:3}, at: nsim_dev_trap_report_work+0x1e0/0xcb0 drivers/net/netdevsim/dev.c:847
 #4: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #4: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #4: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
 #4: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e2/0x400 kernel/locking/spinlock_rt.c:57
 #5: ffffffff8f059580 (local_bh){.+.+}-{1:3}, at: __local_bh_disable_ip+0x3d/0x420 kernel/softirq.c:186
 #6: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: __local_bh_disable_ip+0x3d/0x420 kernel/softirq.c:186
 #7: ffff8880b85396f8 ((bh_lock)){+...}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
 #7: ffff8880b85396f8 ((bh_lock)){+...}-{3:3}, at: napi_skb_cache_get+0xbf/0x450 net/core/skbuff.c:289
 #8: ffff88801dad8b00 (&p->pi_lock){-...}-{2:2}, at: _task_rq_lock+0x5b/0x440 kernel/sched/core.c:770
 #9: ffff8880b853c320 (&rq->__lock){-...}-{2:2}, at: raw_spin_rq_lock_nested+0x2d/0x160 kernel/sched/core.c:677
locks held by khungtaskd/37: 1, last CPU#0:
 #0: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by kworker/u8:11/3261: 2, on CPU#1:
 #0: ffff88813ff64138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff88813ff64138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff88813ff64138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #0: ffff88813ff64138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #1: ffffc9000e4cfc40 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc9000e4cfc40 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc9000e4cfc40 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #1: ffffc9000e4cfc40 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
locks held by getty/5342: 2, on CPU#0:
 #0: ffff88803774e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900044f32e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
locks held by udevd/5630: 1, on CPU#0:
 #0: ffff888027c144c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd00 block/bdev.c:990
locks held by udevd/5755: 1, on CPU#0:
 #0: ffff888027c244c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd00 block/bdev.c:990
locks held by syz.0.17/5918: 1, on CPU#0:
 #0: ffff888027c144c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.0.17/5919: 1, on CPU#1:
 #0: ffff888027c144c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.1.18/5955: 1, on CPU#0:
 #0: ffff888027c244c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.1.18/5956: 1, on CPU#0:
 #0: ffff888027c244c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by udevd/5959: 1, on CPU#0:
 #0: ffff888026c444c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd00 block/bdev.c:990
locks held by udevd/5963: 1, on CPU#1:
 #0: ffff888027cbc4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd00 block/bdev.c:990
locks held by syz.2.19/5993: 1, on CPU#1:
 #0: ffff888027cbc4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.2.19/5994: 1, on CPU#1:
 #0: ffff888027cbc4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.3.20/6030: 1, on CPU#0:
 #0: ffff888026c444c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.3.20/6031: 1, on CPU#0:
 #0: ffff888026c444c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by udevd/6039: 1, on CPU#0:
 #0: ffff888026b544c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd00 block/bdev.c:990
locks held by syz.4.21/6079: 1, on CPU#1:
 #0: ffff888026b544c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.4.21/6080: 1, on CPU#1:
 #0: ffff888026b544c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by udevd/6083: 1, on CPU#0:
 #0: ffff888026b5c4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd00 block/bdev.c:990
locks held by syz.5.22/6123: 1, on CPU#0:
 #0: ffff888026b5c4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.5.22/6124: 1, on CPU#0:
 #0: ffff888026b5c4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by udevd/6128: 1, on CPU#0:
 #0: ffff888026bbc4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd00 block/bdev.c:990
locks held by syz.6.23/6166: 1, on CPU#0:
 #0: ffff888026bbc4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.6.23/6167: 1, on CPU#0:
 #0: ffff888026bbc4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by udevd/6168: 1, on CPU#0:
 #0: ffff888026ad44c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd00 block/bdev.c:990
locks held by syz.7.24/6215: 1, on CPU#0:
 #0: ffff888026ad44c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.7.24/6216: 1, on CPU#0:
 #0: ffff888026ad44c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by udevd/6217: 1, on CPU#1:
 #0: ffff888026a8c4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd00 block/bdev.c:990
locks held by syz.8.25/6259: 1, on CPU#1:
 #0: ffff888026a8c4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.8.25/6260: 1, on CPU#1:
 #0: ffff888026a8c4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by modprobe/6291: 1, last CPU#0:
 #0: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
 #0: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0x8f/0x2550 arch/x86/kernel/unwind_orc.c:495

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
 nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
 trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x135/0x170 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xfd7/0x1030 kernel/hung_task.c:561
 kthread+0x38b/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 1185 Comm: kworker/u8:10 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: bat_events batadv_tt_purge
RIP: 0010:lock_acquire+0xa8/0x350 kernel/locking/lockdep.c:5918
Code: 3d 1c 3f 10 0f 00 0f 84 e4 00 00 00 65 8b 05 3f 8a 04 12 85 c0 0f 85 d5 00 00 00 65 48 8b 2d 47 44 04 12 83 bd 0c 0c 00 00 00 <0f> 85 c0 00 00 00 48 89 5c 24 08 4c 89 fb 9c 41 5f fa 48 c7 c7 7c
RSP: 0018:ffffc90006787868 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 8000000000000001
RDX: 0000000000000000 RSI: ffffffff8b5cd123 RDI: 1ffff1100abfe44b
RBP: ffff8880299d5dc0 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff2164730 R12: ffff888055ff2258
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888124abb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f061045b6b0 CR3: 000000000efb0000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56
 spin_lock_bh include/linux/spinlock_rt.h:90 [inline]
 batadv_tt_local_purge+0x13e/0x380 net/batman-adv/translation-table.c:1400
 batadv_tt_purge+0x35/0x9f0 net/batman-adv/translation-table.c:3753
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

final repro crashed as (corrupted=false):
INFO: task syz.0.17:5918 
INFO: task syz.0.17:5918 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.17        state:D stack:25768 pid:5918  tgid:5918  ppid:5750   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x16d9/0x5700 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7668
 rt_mutex_slowlock_block+0x55e/0x690 kernel/locking/rtmutex.c:1670
 __rt_mutex_slowlock kernel/locking/rtmutex.c:1747 [inline]
 __rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1787 [inline]
 rt_mutex_slowlock+0x2d4/0x780 kernel/locking/rtmutex.c:1827
 __rt_mutex_lock kernel/locking/rtmutex.c:1842 [inline]
 __mutex_lock_common kernel/locking/rtmutex_api.c:562 [inline]
 mutex_lock_nested+0x168/0x1d0 kernel/locking/rtmutex_api.c:580
 bdev_release+0x1be/0x690 block/bdev.c:1173
 blkdev_release+0x15/0x20 block/fops.c:687
 __fput+0x41f/0xa80 fs/file_table.c:512
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
 exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff18aa9e1d9
RSP: 002b:00007fff2920aad8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ff18ad27da0 RCX: 00007ff18aa9e1d9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007ff18ad27da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007ff18ad27cb0 R11: 0000000000000246 R12: 000000000002e7ce
R13: 00007ff18ad25fac R14: 000000000002e4c3 R15: 00007fff2920abe0
 </TASK>
INFO: task syz.0.17:5919 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.17        state:D stack:27264 pid:5919  tgid:5918  ppid:5750   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x16d9/0x5700 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7668
 rt_mutex_slowlock_block+0x55e/0x690 kernel/locking/rtmutex.c:1670
 __rt_mutex_slowlock kernel/locking/rtmutex.c:1747 [inline]
 __rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1787 [inline]
 rt_mutex_slowlock+0x2d4/0x780 kernel/locking/rtmutex.c:1827
 __rt_mutex_lock kernel/locking/rtmutex.c:1842 [inline]
 __mutex_lock_common kernel/locking/rtmutex_api.c:562 [inline]
 mutex_lock_nested+0x168/0x1d0 kernel/locking/rtmutex_api.c:580
 bdev_release+0x1be/0x690 block/bdev.c:1173
 blkdev_release+0x15/0x20 block/fops.c:687
 __fput+0x41f/0xa80 fs/file_table.c:512
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
 exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff18aa9e1d9
RSP: 002b:00007ff18a0fe028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007ff18ad25fa0 RCX: 00007ff18aa9e1d9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000004
RBP: 00007ff18ab35888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff18ad26038 R14: 00007ff18ad25fa0 R15: 00007fff2920a978
 </TASK>

Showing all locks held in the system:
locks held by kworker/0:1/10: 3, on CPU#0:
 #0: ffff88813ff2b938 ((wq_completion)events){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff88813ff2b938 ((wq_completion)events){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff88813ff2b938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #0: ffff88813ff2b938 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #1: ffffc900000f7c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc900000f7c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc900000f7c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #1: ffffc900000f7c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #2: ffff888028174280 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x222/0x3e0 drivers/net/netdevsim/fib.c:1490
locks held by kworker/u8:0/12: 10, last CPU#1:
 #0: ffff88813ff64138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff88813ff64138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff88813ff64138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #0: ffff88813ff64138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #1: ffffc90000117c40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc90000117c40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc90000117c40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #1: ffffc90000117c40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #2: ffff888057bba310 (&devlink->lock_key#11){+.+.}-{4:4}, at: nsim_dev_trap_report_work+0x57/0xcb0 drivers/net/netdevsim/dev.c:834
 #3: ffff88802b632120 (&nsim_trap_data->trap_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
 #3: ffff88802b632120 (&nsim_trap_data->trap_lock){+.+.}-{3:3}, at: nsim_dev_trap_report drivers/net/netdevsim/dev.c:787 [inline]
 #3: ffff88802b632120 (&nsim_trap_data->trap_lock){+.+.}-{3:3}, at: nsim_dev_trap_report_work+0x1e0/0xcb0 drivers/net/netdevsim/dev.c:847
 #4: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #4: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #4: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
 #4: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e2/0x400 kernel/locking/spinlock_rt.c:57
 #5: ffffffff8f059580 (local_bh){.+.+}-{1:3}, at: __local_bh_disable_ip+0x3d/0x420 kernel/softirq.c:186
 #6: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: __local_bh_disable_ip+0x3d/0x420 kernel/softirq.c:186
 #7: ffff8880b85396f8 ((bh_lock)){+...}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
 #7: ffff8880b85396f8 ((bh_lock)){+...}-{3:3}, at: napi_skb_cache_get+0xbf/0x450 net/core/skbuff.c:289
 #8: ffff88801dad8b00 (&p->pi_lock){-...}-{2:2}, at: _task_rq_lock+0x5b/0x440 kernel/sched/core.c:770
 #9: ffff8880b853c320 (&rq->__lock){-...}-{2:2}, at: raw_spin_rq_lock_nested+0x2d/0x160 kernel/sched/core.c:677
locks held by khungtaskd/37: 1, last CPU#0:
 #0: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by kworker/u8:11/3261: 2, on CPU#1:
 #0: ffff88813ff64138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff88813ff64138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff88813ff64138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #0: ffff88813ff64138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
 #1: ffffc9000e4cfc40 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc9000e4cfc40 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc9000e4cfc40 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3361 [inline]
 #1: ffffc9000e4cfc40 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3479
locks held by getty/5342: 2, on CPU#0:
 #0: ffff88803774e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900044f32e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
locks held by udevd/5630: 1, on CPU#0:
 #0: ffff888027c144c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd00 block/bdev.c:990
locks held by udevd/5755: 1, on CPU#0:
 #0: ffff888027c244c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd00 block/bdev.c:990
locks held by syz.0.17/5918: 1, on CPU#0:
 #0: ffff888027c144c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.0.17/5919: 1, on CPU#1:
 #0: ffff888027c144c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.1.18/5955: 1, on CPU#0:
 #0: ffff888027c244c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.1.18/5956: 1, on CPU#0:
 #0: ffff888027c244c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by udevd/5959: 1, on CPU#0:
 #0: ffff888026c444c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd00 block/bdev.c:990
locks held by udevd/5963: 1, on CPU#1:
 #0: ffff888027cbc4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd00 block/bdev.c:990
locks held by syz.2.19/5993: 1, on CPU#1:
 #0: ffff888027cbc4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.2.19/5994: 1, on CPU#1:
 #0: ffff888027cbc4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.3.20/6030: 1, on CPU#0:
 #0: ffff888026c444c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.3.20/6031: 1, on CPU#0:
 #0: ffff888026c444c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by udevd/6039: 1, on CPU#0:
 #0: ffff888026b544c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd00 block/bdev.c:990
locks held by syz.4.21/6079: 1, on CPU#1:
 #0: ffff888026b544c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.4.21/6080: 1, on CPU#1:
 #0: ffff888026b544c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by udevd/6083: 1, on CPU#0:
 #0: ffff888026b5c4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd00 block/bdev.c:990
locks held by syz.5.22/6123: 1, on CPU#0:
 #0: ffff888026b5c4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.5.22/6124: 1, on CPU#0:
 #0: ffff888026b5c4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by udevd/6128: 1, on CPU#0:
 #0: ffff888026bbc4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd00 block/bdev.c:990
locks held by syz.6.23/6166: 1, on CPU#0:
 #0: ffff888026bbc4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.6.23/6167: 1, on CPU#0:
 #0: ffff888026bbc4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by udevd/6168: 1, on CPU#0:
 #0: ffff888026ad44c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd00 block/bdev.c:990
locks held by syz.7.24/6215: 1, on CPU#0:
 #0: ffff888026ad44c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.7.24/6216: 1, on CPU#0:
 #0: ffff888026ad44c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by udevd/6217: 1, on CPU#1:
 #0: ffff888026a8c4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd00 block/bdev.c:990
locks held by syz.8.25/6259: 1, on CPU#1:
 #0: ffff888026a8c4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by syz.8.25/6260: 1, on CPU#1:
 #0: ffff888026a8c4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1be/0x690 block/bdev.c:1173
locks held by modprobe/6291: 1, last CPU#0:
 #0: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
 #0: ffffffff8f1c3d00 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0x8f/0x2550 arch/x86/kernel/unwind_orc.c:495

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
 nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
 trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x135/0x170 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xfd7/0x1030 kernel/hung_task.c:561
 kthread+0x38b/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 1185 Comm: kworker/u8:10 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: bat_events batadv_tt_purge
RIP: 0010:lock_acquire+0xa8/0x350 kernel/locking/lockdep.c:5918
Code: 3d 1c 3f 10 0f 00 0f 84 e4 00 00 00 65 8b 05 3f 8a 04 12 85 c0 0f 85 d5 00 00 00 65 48 8b 2d 47 44 04 12 83 bd 0c 0c 00 00 00 <0f> 85 c0 00 00 00 48 89 5c 24 08 4c 89 fb 9c 41 5f fa 48 c7 c7 7c
RSP: 0018:ffffc90006787868 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 8000000000000001
RDX: 0000000000000000 RSI: ffffffff8b5cd123 RDI: 1ffff1100abfe44b
RBP: ffff8880299d5dc0 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff2164730 R12: ffff888055ff2258
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888124abb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f061045b6b0 CR3: 000000000efb0000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56
 spin_lock_bh include/linux/spinlock_rt.h:90 [inline]
 batadv_tt_local_purge+0x13e/0x380 net/batman-adv/translation-table.c:1400
 batadv_tt_purge+0x35/0x9f0 net/batman-adv/translation-table.c:3753
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>