INFO: task syz-executor.0:6131 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:28528 pid:6131 tgid:6131 ppid:6130 task_flags:0x400040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x15dd/0x52d0 kernel/sched/core.c:6908
__schedule_loop kernel/sched/core.c:6990 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7005
schedule_timeout+0xc3/0x2c0 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:100 [inline]
__wait_for_common kernel/sched/completion.c:121 [inline]
wait_for_common kernel/sched/completion.c:132 [inline]
wait_for_completion+0x2cc/0x5e0 kernel/sched/completion.c:153
__do_sys_io_destroy fs/aio.c:1472 [inline]
__se_sys_io_destroy+0x14e/0x220 fs/aio.c:1450
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x446da9
RSP: 002b:00007f9615e12098 EFLAGS: 00000246 ORIG_RAX: 00000000000000cf
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000446da9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f9615df1000
RBP: 00000000004bbb48 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004bb098
R13: 000000000000000b R14: 000000000056bf80 R15: 00007ffe43c029d8
INFO: task syz-executor.0:6148 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:28528 pid:6148 tgid:6148 ppid:6147 task_flags:0x400040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x15dd/0x52d0 kernel/sched/core.c:6908
__schedule_loop kernel/sched/core.c:6990 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7005
schedule_timeout+0xc3/0x2c0 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:100 [inline]
__wait_for_common kernel/sched/completion.c:121 [inline]
wait_for_common kernel/sched/completion.c:132 [inline]
wait_for_completion+0x2cc/0x5e0 kernel/sched/completion.c:153
__do_sys_io_destroy fs/aio.c:1472 [inline]
__se_sys_io_destroy+0x14e/0x220 fs/aio.c:1450
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x446da9
RSP: 002b:00007f9615e12098 EFLAGS: 00000246 ORIG_RAX: 00000000000000cf
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000446da9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f9615df1000
RBP: 00000000004bbb48 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004bb098
R13: 000000000000000b R14: 000000000056bf80 R15: 00007ffe43c029d8
Showing all locks held in the system:
2 locks held by ksoftirqd/1/23:
1 lock held by khungtaskd/30:
#0: ffffffff8e75e420 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e75e420 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e75e420 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5579:
#0: ffff88803682b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:161 [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:346 [inline]
watchdog+0xfd9/0x1030 kernel/hung_task.c:515
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6010 Comm: syz-executor.0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026
RIP: 0010:wait_consider_task+0x2de/0x2e30 kernel/exit.c:1481
Code: 3d 00 41 83 ff 30 0f 84 93 1c 00 00 45 85 ed 0f 85 c0 1c 00 00 4c 8b 6c 24 08 49 8d 5d 30 48 89 d8 48 c1 e8 03 42 0f b6 04 30 <84> c0 0f 85 34 25 00 00 8b 1b 31 ff 89 de e8 7f fc 3d 00 85 db 0f
RSP: 0018:ffffc900045ff9e0 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffff88807b28dbb0 RCX: 0000000000000000
RDX: ffff888021769e80 RSI: 0000000000000000 RDI: 0000000000000030
RBP: ffffc900045ffb68 R08: ffff888021769e80 R09: 0000000000000002
R10: 0000000000000004 R11: 0000000000000000 R12: ffffc900045ffc80
R13: ffff88807b28db80 R14: dffffc0000000000 R15: 0000000000000000
FS: 000000001af3e4c0(0000) GS:ffff888125563000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000541ff8 CR3: 0000000029e6e000 CR4: 00000000003526f0
Call Trace:
do_wait_thread kernel/exit.c:1570 [inline]
__do_wait+0x152/0x740 kernel/exit.c:1688
do_wait+0x1e7/0x540 kernel/exit.c:1722
kernel_wait4+0x232/0x2b0 kernel/exit.c:1881
__do_sys_wait4 kernel/exit.c:1909 [inline]
__se_sys_wait4 kernel/exit.c:1905 [inline]
__x64_sys_wait4+0x166/0x240 kernel/exit.c:1905
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x46913e
Code: 08 0f 85 55 ec ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 90 41 57 41 56 4d 89 c6 41 55 4d 89 cd 41 54 55 53 48 83 ec 08
RSP: 002b:00007ffe43c02c38 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 000000001af3e4c0 RCX: 000000000046913e
RDX: 0000000040000001 RSI: 00007ffe43c02d0c RDI: ffffffffffffffff
RBP: 00007ffe43c02d0c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000032
R13: 0000000000041b4f R14: 0000000000041b4b R15: 0000000000000005