Extracting prog: 3m27.51260249s
Minimizing prog: 1h4m6.172648892s
Simplifying prog options: 6m9.918027184s
Extracting C: 2m43.514081475s
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:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-socket$nl_netfilter-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000000)='./sys\x00', &(0x7f0000000040)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000080)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
socket$nl_netfilter(0x10, 0x3, 0xc)
pwrite64(r0, &(0x7f00000000c0)="02", 0x1, 0x4)
program crashed: INFO: task hung in do_get_write_access
single: successfully extracted reproducer
found reproducer with 5 syscalls
minimizing guilty program
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-socket$nl_netfilter
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000000)='./sys\x00', &(0x7f0000000040)='sysfs\x00', 0x0, 0x0)
openat(0xffffffffffffff9c, &(0x7f0000000080)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
socket$nl_netfilter(0x10, 0x3, 0xc)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000000)='./sys\x00', &(0x7f0000000040)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000080)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f00000000c0)="02", 0x1, 0x4)
program crashed: INFO: task hung in do_get_write_access
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000000)='./sys\x00', &(0x7f0000000040)='sysfs\x00', 0x0, 0x0)
pwrite64(0xffffffffffffffff, &(0x7f00000000c0)="02", 0x1, 0x4)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./sys\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000080)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f00000000c0)="02", 0x1, 0x4)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mount-openat-pwrite64
detailed listing:
executing program 0:
mount(0x0, &(0x7f0000000000)='./sys\x00', &(0x7f0000000040)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000080)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f00000000c0)="02", 0x1, 0x4)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, 0x0, 0x1ff)
mount(0x0, &(0x7f0000000000)='./sys\x00', &(0x7f0000000040)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000080)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f00000000c0)="02", 0x1, 0x4)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./sys\x00', 0x1ff)
mount(0x0, 0x0, &(0x7f0000000040)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000080)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f00000000c0)="02", 0x1, 0x4)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000000)='./sys\x00', 0x0, 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000080)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f00000000c0)="02", 0x1, 0x4)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000000)='./sys\x00', &(0x7f0000000040)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, 0x0, 0x2, 0x0)
pwrite64(r0, &(0x7f00000000c0)="02", 0x1, 0x4)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000000)='./sys\x00', &(0x7f0000000040)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000080)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, 0x0, 0x0, 0x4)
program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000000)='./sys\x00', &(0x7f0000000040)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000080)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f00000000c0), 0x0, 0x4)
program did not crash
extracting C reproducer
testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-pwrite64
program crashed: INFO: task hung in jbd2_journal_commit_transaction
a never seen crash title: INFO: task hung in jbd2_journal_commit_transaction, ignore
simplifying guilty program options
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000000)='./sys\x00', &(0x7f0000000040)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000080)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f00000000c0)="02", 0x1, 0x4)
program crashed: INFO: task hung in __rq_qos_throttle
a never seen crash title: INFO: task hung in __rq_qos_throttle, 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000000)='./sys\x00', &(0x7f0000000040)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000080)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f00000000c0)="02", 0x1, 0x4)
program crashed: INFO: task hung in jbd2_journal_commit_transaction
a never seen crash title: INFO: task hung in jbd2_journal_commit_transaction, ignore
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000000)='./sys\x00', &(0x7f0000000040)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000080)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f00000000c0)="02", 0x1, 0x4)
program crashed: INFO: task hung in do_get_write_access
validation run: crashed=true
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000000)='./sys\x00', &(0x7f0000000040)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000080)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f00000000c0)="02", 0x1, 0x4)
program crashed: INFO: task hung in jbd2_journal_commit_transaction
validation run: crashed=true
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-pwrite64
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./sys\x00', 0x1ff)
mount(0x0, &(0x7f0000000000)='./sys\x00', &(0x7f0000000040)='sysfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000080)='./sys/bus/pci/devices/0000:00:03.0/config\x00', 0x2, 0x0)
pwrite64(r0, &(0x7f00000000c0)="02", 0x1, 0x4)
program crashed: INFO: task hung in jbd2_journal_commit_transaction
validation run: crashed=true
reproducing took 1h24m42.425690305s
repro crashed as (corrupted=false):
INFO: task jbd2/sda1-8:73 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:jbd2/sda1-8 state:D stack:0 pid:73 tgid:73 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:6060 [inline]
__schedule+0x1496/0x20b0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7957 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7972
io_schedule+0x88/0xe0 kernel/sched/core.c:8786
bit_wait_io+0x17/0xd0 kernel/sched/wait_bit.c:209
__wait_on_bit+0xb3/0x2e0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x139/0x190 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
__wait_on_buffer+0x5a/0x70 fs/buffer.c:123
wait_on_buffer include/linux/buffer_head.h:422 [inline]
jbd2_journal_commit_transaction+0x2dba/0x5510 fs/jbd2/commit.c:814
kjournald2+0x386/0x6a0 fs/jbd2/journal.c:201
kthread+0x2c7/0x360 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
INFO: task syz.3.309:986 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.309 state:D stack:0 pid:986 tgid:986 ppid:384 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6060 [inline]
__schedule+0x1496/0x20b0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7957 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7972
io_schedule+0x88/0xe0 kernel/sched/core.c:8786
bit_wait_io+0x17/0xd0 kernel/sched/wait_bit.c:209
__wait_on_bit+0xb3/0x2e0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x139/0x190 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
do_get_write_access+0x558/0xd70 fs/jbd2/transaction.c:1096
jbd2_journal_get_write_access+0x268/0x3d0 fs/jbd2/transaction.c:1245
__ext4_journal_get_write_access+0x1b6/0x6a0 fs/ext4/ext4_jbd2.c:239
ext4_reserve_inode_write+0x1f6/0x2e0 fs/ext4/inode.c:5892
__ext4_mark_inode_dirty+0xac/0x5e0 fs/ext4/inode.c:6066
ext4_dirty_inode+0xc9/0x110 fs/ext4/inode.c:6103
__mark_inode_dirty+0x24e/0xc50 fs/fs-writeback.c:2515
generic_update_time fs/inode.c:2056 [inline]
inode_update_time fs/inode.c:2069 [inline]
__file_update_time fs/inode.c:2258 [inline]
file_update_time+0x1d3/0x210 fs/inode.c:2288
ext4_page_mkwrite+0x2bf/0x1120 fs/ext4/inode.c:6221
do_page_mkwrite mm/memory.c:3263 [inline]
do_shared_fault mm/memory.c:5537 [inline]
do_fault mm/memory.c:5599 [inline]
do_pte_missing+0x12c4/0x4440 mm/memory.c:4069
handle_pte_fault mm/memory.c:5940 [inline]
__handle_mm_fault mm/memory.c:6083 [inline]
handle_mm_fault+0x1189/0x1ba0 mm/memory.c:6251
do_user_addr_fault+0x951/0x1230 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1479 [inline]
exc_page_fault+0x58/0xc0 arch/x86/mm/fault.c:1534
asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f742ac667f1
RSP: 002b:00007ffd02c5dd00 EFLAGS: 00010202
RAX: 0000001b34b64000 RBX: 0000000000000000 RCX: 000000000003fde8
RDX: 0000001b34b63fff RSI: 0000000000000008 RDI: 00007f742bb55720
RBP: 00007f742bb55720 R08: 0000000000000000 R09: 00007f742b026038
R10: 00007f742bb55700 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003
INFO: task syz.0.312:988 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.312 state:D stack:0 pid:988 tgid:988 ppid:378 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6060 [inline]
__schedule+0x1496/0x20b0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7957 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7972
io_schedule+0x88/0xe0 kernel/sched/core.c:8786
bit_wait_io+0x17/0xd0 kernel/sched/wait_bit.c:209
__wait_on_bit+0xb3/0x2e0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x139/0x190 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
do_get_write_access+0x558/0xd70 fs/jbd2/transaction.c:1096
jbd2_journal_get_write_access+0x268/0x3d0 fs/jbd2/transaction.c:1245
__ext4_journal_get_write_access+0x1b6/0x6a0 fs/ext4/ext4_jbd2.c:239
ext4_reserve_inode_write+0x1f6/0x2e0 fs/ext4/inode.c:5892
__ext4_mark_inode_dirty+0xac/0x5e0 fs/ext4/inode.c:6066
ext4_dirty_inode+0xc9/0x110 fs/ext4/inode.c:6103
__mark_inode_dirty+0x24e/0xc50 fs/fs-writeback.c:2515
generic_update_time fs/inode.c:2056 [inline]
inode_update_time fs/inode.c:2069 [inline]
__file_update_time fs/inode.c:2258 [inline]
file_update_time+0x1d3/0x210 fs/inode.c:2288
ext4_page_mkwrite+0x2bf/0x1120 fs/ext4/inode.c:6221
do_page_mkwrite mm/memory.c:3263 [inline]
do_shared_fault mm/memory.c:5537 [inline]
do_fault mm/memory.c:5599 [inline]
do_pte_missing+0x12c4/0x4440 mm/memory.c:4069
handle_pte_fault mm/memory.c:5940 [inline]
__handle_mm_fault mm/memory.c:6083 [inline]
handle_mm_fault+0x1189/0x1ba0 mm/memory.c:6251
do_user_addr_fault+0x951/0x1230 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1479 [inline]
exc_page_fault+0x58/0xc0 arch/x86/mm/fault.c:1534
asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f28af4667f1
RSP: 002b:00007ffd3769c490 EFLAGS: 00010202
RAX: 0000001b34564000 RBX: 0000000000000000 RCX: 000000000003fde8
RDX: 0000001b34563fff RSI: 0000000000000008 RDI: 00007f28b0355720
RBP: 00007f28b0355720 R08: 0000000000000000 R09: 00007f28af826038
R10: 00007f28b0355700 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003
INFO: task syz.4.311:990 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.311 state:D stack:0 pid:990 tgid:990 ppid:381 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6060 [inline]
__schedule+0x1496/0x20b0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7957 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7972
io_schedule+0x88/0xe0 kernel/sched/core.c:8786
bit_wait_io+0x17/0xd0 kernel/sched/wait_bit.c:209
__wait_on_bit+0xb3/0x2e0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x139/0x190 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
do_get_write_access+0x558/0xd70 fs/jbd2/transaction.c:1096
jbd2_journal_get_write_access+0x268/0x3d0 fs/jbd2/transaction.c:1245
__ext4_journal_get_write_access+0x1b6/0x6a0 fs/ext4/ext4_jbd2.c:239
ext4_reserve_inode_write+0x1f6/0x2e0 fs/ext4/inode.c:5892
__ext4_mark_inode_dirty+0xac/0x5e0 fs/ext4/inode.c:6066
ext4_dirty_inode+0xc9/0x110 fs/ext4/inode.c:6103
__mark_inode_dirty+0x24e/0xc50 fs/fs-writeback.c:2515
generic_update_time fs/inode.c:2056 [inline]
inode_update_time fs/inode.c:2069 [inline]
__file_update_time fs/inode.c:2258 [inline]
file_update_time+0x1d3/0x210 fs/inode.c:2288
ext4_page_mkwrite+0x2bf/0x1120 fs/ext4/inode.c:6221
do_page_mkwrite mm/memory.c:3263 [inline]
do_shared_fault mm/memory.c:5537 [inline]
do_fault mm/memory.c:5599 [inline]
do_pte_missing+0x12c4/0x4440 mm/memory.c:4069
handle_pte_fault mm/memory.c:5940 [inline]
__handle_mm_fault mm/memory.c:6083 [inline]
handle_mm_fault+0x1189/0x1ba0 mm/memory.c:6251
do_user_addr_fault+0x951/0x1230 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1479 [inline]
exc_page_fault+0x58/0xc0 arch/x86/mm/fault.c:1534
asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f3026e6ba23
RSP: 002b:00007fff9c4721b0 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b34724000 RSI: 0000000000040000 RDI: 00007f30271e0708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007fff9c472440
INFO: task syz.5.313:993 blocked for more than 124 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.313 state:D stack:0 pid:993 tgid:993 ppid:382 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6060 [inline]
__schedule+0x1496/0x20b0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7957 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7972
io_schedule+0x88/0xe0 kernel/sched/core.c:8786
bit_wait_io+0x17/0xd0 kernel/sched/wait_bit.c:209
__wait_on_bit+0xb3/0x2e0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x139/0x190 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
do_get_write_access+0x558/0xd70 fs/jbd2/transaction.c:1096
jbd2_journal_get_write_access+0x268/0x3d0 fs/jbd2/transaction.c:1245
__ext4_journal_get_write_access+0x1b6/0x6a0 fs/ext4/ext4_jbd2.c:239
ext4_reserve_inode_write+0x1f6/0x2e0 fs/ext4/inode.c:5892
__ext4_mark_inode_dirty+0xac/0x5e0 fs/ext4/inode.c:6066
ext4_dirty_inode+0xc9/0x110 fs/ext4/inode.c:6103
__mark_inode_dirty+0x24e/0xc50 fs/fs-writeback.c:2515
generic_update_time fs/inode.c:2056 [inline]
inode_update_time fs/inode.c:2069 [inline]
__file_update_time fs/inode.c:2258 [inline]
file_update_time+0x1d3/0x210 fs/inode.c:2288
ext4_page_mkwrite+0x2bf/0x1120 fs/ext4/inode.c:6221
do_page_mkwrite mm/memory.c:3263 [inline]
do_shared_fault mm/memory.c:5537 [inline]
do_fault mm/memory.c:5599 [inline]
do_pte_missing+0x12c4/0x4440 mm/memory.c:4069
handle_pte_fault mm/memory.c:5940 [inline]
__handle_mm_fault mm/memory.c:6083 [inline]
handle_mm_fault+0x1189/0x1ba0 mm/memory.c:6251
do_user_addr_fault+0x951/0x1230 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1479 [inline]
exc_page_fault+0x58/0xc0 arch/x86/mm/fault.c:1534
asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f8e9bc6ba23
RSP: 002b:00007ffe7863ab60 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b34824000 RSI: 0000000000040000 RDI: 00007f8e9bfe0708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffe7863adf0
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 9a2c17613351c9eac8e18d74829f474689ac6bc1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2ba/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
watchdog+0xe45/0xf90 kernel/hung_task.c:423
kthread+0x2c7/0x360 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 9a2c17613351c9eac8e18d74829f474689ac6bc1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:116
Code: cc cc cc cc cc cc cc b8 08 67 f5 e4 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 23 b9 42 00 55 48 89 e5 fb f4 <5d> c3 cc cc cc cc cc cc cc cc cc cc cc b8 00 00 00 00 90 90 90 90
RSP: 0018:ffffffff87407da0 EFLAGS: 000002c2
RAX: ffff8881f6e00000 RBX: ffffffff874156c0 RCX: ffffffff85a4a4fd
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000022ce4
RBP: ffffffff87407da0 R08: ffff8881f6e395eb R09: 1ffff1103edc72bd
R10: dffffc0000000000 R11: ffffed103edc72be R12: 0000000000000000
R13: 1ffffffff0e82ad8 R14: dffffc0000000000 R15: ffffffff87ecc9a8
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f29ee5ebbf0 CR3: 000000010d3b8000 CR4: 00000000003526b0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:-1 [inline]
default_idle+0x17/0x30 arch/x86/kernel/process.c:754
arch_cpu_idle+0xd/0x20 arch/x86/kernel/process.c:791
default_idle_call+0x3e/0x80 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:193 [inline]
do_idle+0x1df/0x570 kernel/sched/idle.c:346
cpu_startup_entry+0x47/0x60 kernel/sched/idle.c:445
rest_init+0x10b/0x130 init/main.c:760
start_kernel+0x462/0x4bb init/main.c:1242
x86_64_start_reservations+0x2e/0x30 arch/x86/kernel/head64.c:507
x86_64_start_kernel+0x6a/0x7b arch/x86/kernel/head64.c:488
common_startup_64+0x13b/0x157
final repro crashed as (corrupted=false):
INFO: task jbd2/sda1-8:73 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:jbd2/sda1-8 state:D stack:0 pid:73 tgid:73 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:6060 [inline]
__schedule+0x1496/0x20b0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7957 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7972
io_schedule+0x88/0xe0 kernel/sched/core.c:8786
bit_wait_io+0x17/0xd0 kernel/sched/wait_bit.c:209
__wait_on_bit+0xb3/0x2e0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x139/0x190 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
__wait_on_buffer+0x5a/0x70 fs/buffer.c:123
wait_on_buffer include/linux/buffer_head.h:422 [inline]
jbd2_journal_commit_transaction+0x2dba/0x5510 fs/jbd2/commit.c:814
kjournald2+0x386/0x6a0 fs/jbd2/journal.c:201
kthread+0x2c7/0x360 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
INFO: task syz.3.309:986 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.309 state:D stack:0 pid:986 tgid:986 ppid:384 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6060 [inline]
__schedule+0x1496/0x20b0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7957 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7972
io_schedule+0x88/0xe0 kernel/sched/core.c:8786
bit_wait_io+0x17/0xd0 kernel/sched/wait_bit.c:209
__wait_on_bit+0xb3/0x2e0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x139/0x190 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
do_get_write_access+0x558/0xd70 fs/jbd2/transaction.c:1096
jbd2_journal_get_write_access+0x268/0x3d0 fs/jbd2/transaction.c:1245
__ext4_journal_get_write_access+0x1b6/0x6a0 fs/ext4/ext4_jbd2.c:239
ext4_reserve_inode_write+0x1f6/0x2e0 fs/ext4/inode.c:5892
__ext4_mark_inode_dirty+0xac/0x5e0 fs/ext4/inode.c:6066
ext4_dirty_inode+0xc9/0x110 fs/ext4/inode.c:6103
__mark_inode_dirty+0x24e/0xc50 fs/fs-writeback.c:2515
generic_update_time fs/inode.c:2056 [inline]
inode_update_time fs/inode.c:2069 [inline]
__file_update_time fs/inode.c:2258 [inline]
file_update_time+0x1d3/0x210 fs/inode.c:2288
ext4_page_mkwrite+0x2bf/0x1120 fs/ext4/inode.c:6221
do_page_mkwrite mm/memory.c:3263 [inline]
do_shared_fault mm/memory.c:5537 [inline]
do_fault mm/memory.c:5599 [inline]
do_pte_missing+0x12c4/0x4440 mm/memory.c:4069
handle_pte_fault mm/memory.c:5940 [inline]
__handle_mm_fault mm/memory.c:6083 [inline]
handle_mm_fault+0x1189/0x1ba0 mm/memory.c:6251
do_user_addr_fault+0x951/0x1230 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1479 [inline]
exc_page_fault+0x58/0xc0 arch/x86/mm/fault.c:1534
asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f742ac667f1
RSP: 002b:00007ffd02c5dd00 EFLAGS: 00010202
RAX: 0000001b34b64000 RBX: 0000000000000000 RCX: 000000000003fde8
RDX: 0000001b34b63fff RSI: 0000000000000008 RDI: 00007f742bb55720
RBP: 00007f742bb55720 R08: 0000000000000000 R09: 00007f742b026038
R10: 00007f742bb55700 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003
INFO: task syz.0.312:988 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.312 state:D stack:0 pid:988 tgid:988 ppid:378 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6060 [inline]
__schedule+0x1496/0x20b0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7957 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7972
io_schedule+0x88/0xe0 kernel/sched/core.c:8786
bit_wait_io+0x17/0xd0 kernel/sched/wait_bit.c:209
__wait_on_bit+0xb3/0x2e0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x139/0x190 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
do_get_write_access+0x558/0xd70 fs/jbd2/transaction.c:1096
jbd2_journal_get_write_access+0x268/0x3d0 fs/jbd2/transaction.c:1245
__ext4_journal_get_write_access+0x1b6/0x6a0 fs/ext4/ext4_jbd2.c:239
ext4_reserve_inode_write+0x1f6/0x2e0 fs/ext4/inode.c:5892
__ext4_mark_inode_dirty+0xac/0x5e0 fs/ext4/inode.c:6066
ext4_dirty_inode+0xc9/0x110 fs/ext4/inode.c:6103
__mark_inode_dirty+0x24e/0xc50 fs/fs-writeback.c:2515
generic_update_time fs/inode.c:2056 [inline]
inode_update_time fs/inode.c:2069 [inline]
__file_update_time fs/inode.c:2258 [inline]
file_update_time+0x1d3/0x210 fs/inode.c:2288
ext4_page_mkwrite+0x2bf/0x1120 fs/ext4/inode.c:6221
do_page_mkwrite mm/memory.c:3263 [inline]
do_shared_fault mm/memory.c:5537 [inline]
do_fault mm/memory.c:5599 [inline]
do_pte_missing+0x12c4/0x4440 mm/memory.c:4069
handle_pte_fault mm/memory.c:5940 [inline]
__handle_mm_fault mm/memory.c:6083 [inline]
handle_mm_fault+0x1189/0x1ba0 mm/memory.c:6251
do_user_addr_fault+0x951/0x1230 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1479 [inline]
exc_page_fault+0x58/0xc0 arch/x86/mm/fault.c:1534
asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f28af4667f1
RSP: 002b:00007ffd3769c490 EFLAGS: 00010202
RAX: 0000001b34564000 RBX: 0000000000000000 RCX: 000000000003fde8
RDX: 0000001b34563fff RSI: 0000000000000008 RDI: 00007f28b0355720
RBP: 00007f28b0355720 R08: 0000000000000000 R09: 00007f28af826038
R10: 00007f28b0355700 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003
INFO: task syz.4.311:990 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.311 state:D stack:0 pid:990 tgid:990 ppid:381 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6060 [inline]
__schedule+0x1496/0x20b0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7957 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7972
io_schedule+0x88/0xe0 kernel/sched/core.c:8786
bit_wait_io+0x17/0xd0 kernel/sched/wait_bit.c:209
__wait_on_bit+0xb3/0x2e0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x139/0x190 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
do_get_write_access+0x558/0xd70 fs/jbd2/transaction.c:1096
jbd2_journal_get_write_access+0x268/0x3d0 fs/jbd2/transaction.c:1245
__ext4_journal_get_write_access+0x1b6/0x6a0 fs/ext4/ext4_jbd2.c:239
ext4_reserve_inode_write+0x1f6/0x2e0 fs/ext4/inode.c:5892
__ext4_mark_inode_dirty+0xac/0x5e0 fs/ext4/inode.c:6066
ext4_dirty_inode+0xc9/0x110 fs/ext4/inode.c:6103
__mark_inode_dirty+0x24e/0xc50 fs/fs-writeback.c:2515
generic_update_time fs/inode.c:2056 [inline]
inode_update_time fs/inode.c:2069 [inline]
__file_update_time fs/inode.c:2258 [inline]
file_update_time+0x1d3/0x210 fs/inode.c:2288
ext4_page_mkwrite+0x2bf/0x1120 fs/ext4/inode.c:6221
do_page_mkwrite mm/memory.c:3263 [inline]
do_shared_fault mm/memory.c:5537 [inline]
do_fault mm/memory.c:5599 [inline]
do_pte_missing+0x12c4/0x4440 mm/memory.c:4069
handle_pte_fault mm/memory.c:5940 [inline]
__handle_mm_fault mm/memory.c:6083 [inline]
handle_mm_fault+0x1189/0x1ba0 mm/memory.c:6251
do_user_addr_fault+0x951/0x1230 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1479 [inline]
exc_page_fault+0x58/0xc0 arch/x86/mm/fault.c:1534
asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f3026e6ba23
RSP: 002b:00007fff9c4721b0 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b34724000 RSI: 0000000000040000 RDI: 00007f30271e0708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007fff9c472440
INFO: task syz.5.313:993 blocked for more than 124 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.313 state:D stack:0 pid:993 tgid:993 ppid:382 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6060 [inline]
__schedule+0x1496/0x20b0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7957 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7972
io_schedule+0x88/0xe0 kernel/sched/core.c:8786
bit_wait_io+0x17/0xd0 kernel/sched/wait_bit.c:209
__wait_on_bit+0xb3/0x2e0 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0x139/0x190 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:101 [inline]
do_get_write_access+0x558/0xd70 fs/jbd2/transaction.c:1096
jbd2_journal_get_write_access+0x268/0x3d0 fs/jbd2/transaction.c:1245
__ext4_journal_get_write_access+0x1b6/0x6a0 fs/ext4/ext4_jbd2.c:239
ext4_reserve_inode_write+0x1f6/0x2e0 fs/ext4/inode.c:5892
__ext4_mark_inode_dirty+0xac/0x5e0 fs/ext4/inode.c:6066
ext4_dirty_inode+0xc9/0x110 fs/ext4/inode.c:6103
__mark_inode_dirty+0x24e/0xc50 fs/fs-writeback.c:2515
generic_update_time fs/inode.c:2056 [inline]
inode_update_time fs/inode.c:2069 [inline]
__file_update_time fs/inode.c:2258 [inline]
file_update_time+0x1d3/0x210 fs/inode.c:2288
ext4_page_mkwrite+0x2bf/0x1120 fs/ext4/inode.c:6221
do_page_mkwrite mm/memory.c:3263 [inline]
do_shared_fault mm/memory.c:5537 [inline]
do_fault mm/memory.c:5599 [inline]
do_pte_missing+0x12c4/0x4440 mm/memory.c:4069
handle_pte_fault mm/memory.c:5940 [inline]
__handle_mm_fault mm/memory.c:6083 [inline]
handle_mm_fault+0x1189/0x1ba0 mm/memory.c:6251
do_user_addr_fault+0x951/0x1230 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1479 [inline]
exc_page_fault+0x58/0xc0 arch/x86/mm/fault.c:1534
asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f8e9bc6ba23
RSP: 002b:00007ffe7863ab60 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b34824000 RSI: 0000000000040000 RDI: 00007f8e9bfe0708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffe7863adf0
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 9a2c17613351c9eac8e18d74829f474689ac6bc1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2ba/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
watchdog+0xe45/0xf90 kernel/hung_task.c:423
kthread+0x2c7/0x360 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 9a2c17613351c9eac8e18d74829f474689ac6bc1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:116
Code: cc cc cc cc cc cc cc b8 08 67 f5 e4 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 23 b9 42 00 55 48 89 e5 fb f4 <5d> c3 cc cc cc cc cc cc cc cc cc cc cc b8 00 00 00 00 90 90 90 90
RSP: 0018:ffffffff87407da0 EFLAGS: 000002c2
RAX: ffff8881f6e00000 RBX: ffffffff874156c0 RCX: ffffffff85a4a4fd
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000022ce4
RBP: ffffffff87407da0 R08: ffff8881f6e395eb R09: 1ffff1103edc72bd
R10: dffffc0000000000 R11: ffffed103edc72be R12: 0000000000000000
R13: 1ffffffff0e82ad8 R14: dffffc0000000000 R15: ffffffff87ecc9a8
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f29ee5ebbf0 CR3: 000000010d3b8000 CR4: 00000000003526b0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:-1 [inline]
default_idle+0x17/0x30 arch/x86/kernel/process.c:754
arch_cpu_idle+0xd/0x20 arch/x86/kernel/process.c:791
default_idle_call+0x3e/0x80 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:193 [inline]
do_idle+0x1df/0x570 kernel/sched/idle.c:346
cpu_startup_entry+0x47/0x60 kernel/sched/idle.c:445
rest_init+0x10b/0x130 init/main.c:760
start_kernel+0x462/0x4bb init/main.c:1242
x86_64_start_reservations+0x2e/0x30 arch/x86/kernel/head64.c:507
x86_64_start_kernel+0x6a/0x7b arch/x86/kernel/head64.c:488
common_startup_64+0x13b/0x157