INFO: task syz.4.393:7886 blocked for more than 144 seconds.
Not tainted syzkaller #0
Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.393 state:D stack:23944 pid:7886 tgid:7886 ppid:5827 task_flags:0x40004c flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5264 [inline]
__schedule+0x1848/0x4ec0 kernel/sched/core.c:6872
__schedule_loop kernel/sched/core.c:6954 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6969
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7026
rwsem_down_read_slowpath+0x5fd/0x8f0 kernel/locking/rwsem.c:1086
__down_read_common kernel/locking/rwsem.c:1261 [inline]
__down_read kernel/locking/rwsem.c:1274 [inline]
down_read+0x98/0x2e0 kernel/locking/rwsem.c:1539
mmap_read_lock include/linux/mmap_lock.h:365 [inline]
exit_mm+0xcc/0x2c0 kernel/exit.c:557
do_exit+0x650/0x2300 kernel/exit.c:958
do_group_exit+0x21c/0x2d0 kernel/exit.c:1111
__do_sys_exit_group kernel/exit.c:1122 [inline]
__se_sys_exit_group kernel/exit.c:1120 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1120
x64_sys_call+0x2210/0x2210 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd73278f6c9
RSP: 002b:00007fffc6325c18 EFLAGS: 00000246
ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd73278f6c9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fffc6325c7c R08: 00000010c6325d0f R09: 00000000000927c0
R10: 0000000000000148 R11: 0000000000000246 R12: 000000000000005b
R13: 00000000000927c0 R14: 000000000004c130 R15: 00007fffc6325cd0
INFO: task syz.4.393:7887 blocked for more than 146 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.393 state:D stack:24584 pid:7887 tgid:7886 ppid:5827 task_flags:0x400040 flags:0x00080003
Call Trace:
context_switch kernel/sched/core.c:5264 [inline]
__schedule+0x1848/0x4ec0 kernel/sched/core.c:6872
__schedule_loop kernel/sched/core.c:6954 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6969
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7026
rwsem_down_write_slowpath+0x872/0xfe0 kernel/locking/rwsem.c:1185
__down_write_common kernel/locking/rwsem.c:1317 [inline]
__down_write kernel/locking/rwsem.c:1326 [inline]
down_write+0x1ab/0x1f0 kernel/locking/rwsem.c:1591
mmap_write_lock include/linux/mmap_lock.h:309 [inline]
userfaultfd_release_all+0x152/0x5d0 mm/userfaultfd.c:2105
userfaultfd_release+0xe7/0x1b0 fs/userfaultfd.c:877
__fput+0x44c/0xa70 fs/file_table.c:468
task_work_run+0x1d4/0x260 kernel/task_work.c:233
get_signal+0x11ec/0x1340 kernel/signal.c:2807
arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
exit_to_user_mode_loop+0x87/0x4f0 kernel/entry/common.c:75
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x2e9/0xfa0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd73278f6c9
RSP: 002b:00007fd7336ad038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffff5 RBX: 00007fd7329e5fa0 RCX: 00007fd73278f6c9
RDX: 0000200000000000 RSI: 00000000c028aa03 RDI: 0000000000000003
RBP: 00007fd732811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd7329e6038 R14: 00007fd7329e5fa0 R15: 00007fffc63258b8
INFO: task syz.4.393:7891 blocked for more than 147 seconds.
Not tainted syzkaller #0
Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.393 state:D stack:23432 pid:7891 tgid:7886 ppid:5827 task_flags:0x40054c flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5264 [inline]
__schedule+0x1848/0x4ec0 kernel/sched/core.c:6872
__schedule_loop kernel/sched/core.c:6954 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6969
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7026
rwsem_down_read_slowpath+0x5fd/0x8f0 kernel/locking/rwsem.c:1086
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8df3b720 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8df3b720 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8df3b720 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5584:
#0: ffff88802ffae0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900036bb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by syz-executor/5810:
3 locks held by kworker/0:3/5836:
#0: ffff8880b863a3d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xad/0x140 kernel/sched/core.c:646
#1: ffff8880b8624048 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880 kernel/sched/psi.c:933
#2: ffff8880b8625b98 (&base->lock){-.-.}-{2:2}, at: lock_timer_base kernel/time/timer.c:1004 [inline]
#2: ffff8880b8625b98 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x1ae/0xf30 kernel/time/timer.c:1085
1 lock held by syz.4.393/7887:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:336 [inline]
watchdog+0xfa9/0xff0 kernel/hung_task.c:499
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
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 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: 13 f1 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d f3 0a 0c 00 f3 0f 1e fa fb f4 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff8dc07d80 EFLAGS: 000002c2
RAX: 7ae6a4fd5a6b1300 RBX: ffffffff81976627 RCX: 7ae6a4fd5a6b1300
RDX: 0000000000000001 RSI: ffffffff8d786e5e RDI: ffffffff8bbf41e0
RBP: ffffffff8dc07ea8 R08: ffff8880b863339b R09: 1ffff110170c6673
R10: dffffc0000000000 R11: ffffed10170c6674 R12: ffffffff8f7da970
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1b92660
FS: 0000000000000000(0000) GS:ffff888125ec2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f16af5b4198 CR3: 00000000724d0000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x73/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:190 [inline]
do_idle+0x1e7/0x510 kernel/sched/idle.c:330
cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:428
rest_init+0x2de/0x300 init/main.c:758
start_kernel+0x3ac/0x410 init/main.c:1208
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x147