INFO: task syz.6.5761:17997 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.5761 state:D stack:0 pid:17997 tgid:17996 ppid:16851 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
super_lock+0x150/0x300 fs/super.c:115
super_lock_shared fs/super.c:140 [inline]
iterate_supers+0x8a/0x560 fs/super.c:934
ksys_sync+0x95/0x160 fs/sync.c:103
__ia32_sys_sync+0x12/0x20 fs/sync.c:114
x64_sys_call+0x2a58/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:163
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7ffbf358f6c9
RSP: 002b:00007ffbf4431038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007ffbf37e5fa0 RCX: 00007ffbf358f6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffbf37e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffbf37e6038 R14: 00007ffbf37e5fa0 R15: 00007ffe8bc62af8
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2bf/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+0xd8f/0xed0 kernel/hung_task.c:423
kthread+0x2ca/0x370 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 22154 Comm: syz.4.7082 Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:36 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:230 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:149 [inline]
RIP: 0010:wrmsr arch/x86/include/asm/msr.h:256 [inline]
RIP: 0010:native_apic_msr_write+0x42/0x60 arch/x86/include/asm/apic.h:212
Code: 75 17 5d c3 cc cc cc cc cc 81 ff d0 00 00 00 74 f1 81 ff e0 00 00 00 74 e9 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 eb d4 f3 0f 1e fa 89 f6 31 d2 e8 dd f1 9a 01 5d c3 cc cc cc
RSP: 0018:ffffc900016ff980 EFLAGS: 00000046
RAX: 000000000000003e RBX: ffff8881f6f28398 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 000000000000003e RDI: 0000000000000838
RBP: ffffc900016ff980 R08: ffff88812e0f1300 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff8141fe60 R12: 000000000000003e
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000020
FS: 00007f00c822c6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000022ff6 CR3: 0000000130f4a000 CR4: 00000000003526b0
Call Trace:
apic_write arch/x86/include/asm/apic.h:405 [inline]
lapic_next_event+0x15/0x20 arch/x86/kernel/apic/apic.c:415
clockevents_program_min_delta+0x1b9/0x360 kernel/time/clockevents.c:248
clockevents_program_event+0x24d/0x350 kernel/time/clockevents.c:-1
tick_program_event+0x9b/0x120 kernel/time/tick-oneshot.c:44
__hrtimer_reprogram kernel/time/hrtimer.c:700 [inline]
hrtimer_reprogram+0x341/0x3e0 kernel/time/hrtimer.c:883
hrtimer_start_range_ns+0x16da/0x2190 kernel/time/hrtimer.c:1348
hrtimer_start_expires include/linux/hrtimer.h:290 [inline]
hrtimer_restart include/linux/hrtimer.h:298 [inline]
common_hrtimer_rearm+0x10e/0x120 kernel/time/posix-timers.c:250
posixtimer_rearm+0x155/0x360 kernel/time/posix-timers.c:268
dequeue_signal+0x1c6/0x4f0 kernel/signal.c:700
get_signal+0x51c/0x14f0 kernel/signal.c:2813
arch_do_signal_or_restart+0x96/0x720 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x58/0xb0 kernel/entry/common.c:218
do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f00c738f6c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f00c822c0e8 EFLAGS: 00000246
RAX: fffffffffffffffc RBX: 00007f00c75e6098 RCX: 00007f00c738f6c9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f00c75e6098
RBP: 00007f00c75e6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f00c75e6128 R14: 00007ffc8a567220 R15: 00007ffc8a567308