INFO: task syz.3.165:6482 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.165 state:D stack:26920 pid:6482 tgid:6482 ppid:5863 task_flags:0x400040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115
__mutex_lock_common kernel/locking/mutex.c:676 [inline]
__mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760
pipe_release+0x48/0x330 fs/pipe.c:727
__fput+0x44c/0xa70 fs/file_table.c:468
task_work_run+0x1d1/0x260 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f128b78eec9
RSP: 002b:00007ffcdff1c4d8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f128b9e7da0 RCX: 00007f128b78eec9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f128b9e7da0 R08: 0000000000003c2c R09: 00000007dff1c7cf
R10: 00007f128b9e7cb0 R11: 0000000000000246 R12: 000000000001d785
R13: 00007ffcdff1c5d0 R14: ffffffffffffffff R15: 00007ffcdff1c5f0
Showing all locks held in the system:
3 locks held by kworker/1:0/24:
1 lock held by khungtaskd/31:
#0: ffffffff8e13a0e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13a0e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e13a0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
1 lock held by udevd/5234:
1 lock held by dhcpcd/5528:
2 locks held by getty/5625:
#0: ffff88814d0290a0 (&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+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by dhcpcd/5664:
1 lock held by dhcpcd/5668:
1 lock held by syz-executor/5861:
1 lock held by syz-executor/5862:
1 lock held by syz-executor/5865:
1 lock held by udevd/5919:
1 lock held by udevd/5939:
1 lock held by udevd/6437:
1 lock held by syz.3.165/6482:
#0: ffff888058868868 (&pipe->mutex){+.+.}-{4:4}, at: pipe_release+0x48/0x330 fs/pipe.c:727
1 lock held by syz.3.165/6484:
#0: ffff888058868868 (&pipe->mutex){+.+.}-{4:4}, at: splice_file_to_pipe+0x2e/0x440 fs/splice.c:1289
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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:328 [inline]
watchdog+0xf93/0xfe0 kernel/hung_task.c:491
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148
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: 101 PID: 5528 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:group_send_sig_info+0x185/0x260 kernel/signal.c:1418
Code: 48 c7 c2 c0 c7 89 8b e8 99 95 16 00 48 c7 c7 e0 a0 13 8e 4c 89 e6 e8 7a 7b 16 00 e8 05 27 20 00 31 ff 44 89 ee e8 db be 38 00 <45> 85 ed 74 2f e8 91 ba 38 00 65 48 8b 05 e9 7b 17 11 48 3b 44 24
RSP: 0018:ffffc90000a08e58 EFLAGS: 00000006
RAX: ffffffff8186f425 RBX: ffff88802eac5a00 RCX: 0000000000010000
RDX: ffff88802eac5a00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8186f2dd
R10: dffffc0000000000 R11: ffffffff81cbfb20 R12: ffffffff8186f2dd
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000011
FS: 00007f33d529c740(0000) GS:ffff888125d39000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564433c8a168 CR3: 0000000033718000 CR4: 00000000003526f0
Call Trace:
do_bpf_send_signal+0xa9/0x1c0 kernel/trace/bpf_trace.c:814
irq_work_single+0xe1/0x240 kernel/irq_work.c:221
irq_work_run_list kernel/irq_work.c:252 [inline]
irq_work_run+0x155/0x2f0 kernel/irq_work.c:261
__sysvec_irq_work+0xa8/0x3d0 arch/x86/kernel/irq_work.c:22
instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
sysvec_irq_work+0x9e/0xc0 arch/x86/kernel/irq_work.c:17
asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:36 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:139 [inline]
RIP: 0010:wrmsrq arch/x86/include/asm/msr.h:199 [inline]
RIP: 0010:native_apic_msr_write+0x39/0x50 arch/x86/include/asm/apic.h:212
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 c3 cc cc cc cc cc f3 0f 1e fa 89 f6 31 d2 e9 12 1f 8f 03 66
RSP: 0018:ffffc90003a3fb08 EFLAGS: 00000246
RAX: 00000000000000f6 RBX: 0000000000000200 RCX: 000000000000083f
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000083f
RBP: ffffc90003a3fbe0 R08: ffffc90003a3fb67 R09: 1ffff92000747f6c
R10: dffffc0000000000 R11: fffff52000747f6d R12: ffff8880b8731401
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880b87314b0
__apic_send_IPI_self arch/x86/include/asm/apic.h:455 [inline]
arch_irq_work_raise+0x6d/0x80 arch/x86/kernel/irq_work.c:31
irq_work_raise kernel/irq_work.c:84 [inline]
__irq_work_queue_local+0x1d7/0x550 kernel/irq_work.c:112
irq_work_queue+0x99/0x140 kernel/irq_work.c:124
bpf_send_signal_common+0x3b4/0x540 kernel/trace/bpf_trace.c:872
____bpf_send_signal kernel/trace/bpf_trace.c:881 [inline]
bpf_send_signal+0x1d/0x30 kernel/trace/bpf_trace.c:879
bpf_prog_7ba5217f62dcd359+0x41/0x49
bpf_dispatcher_nop_func include/linux/bpf.h:1335 [inline]
__bpf_prog_run include/linux/filter.h:718 [inline]
bpf_prog_run include/linux/filter.h:725 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2257 [inline]
bpf_trace_run2+0x284/0x4b0 kernel/trace/bpf_trace.c:2298
__bpf_trace_sys_enter+0x38/0x60 include/trace/events/syscalls.h:18
__do_trace_sys_enter include/trace/events/syscalls.h:18 [inline]
trace_sys_enter+0xb0/0x100 include/trace/events/syscalls.h:18
syscall_trace_enter+0xf9/0x160 kernel/entry/syscall-common.c:53
syscall_enter_from_user_mode_work include/linux/entry-common.h:95 [inline]
syscall_enter_from_user_mode include/linux/entry-common.h:125 [inline]
do_syscall_64+0xd3/0x3b0 arch/x86/entry/syscall_64.c:90
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f33d52de189
Code: 16 00 00 00 eb de 66 2e 0f 1f 84 00 00 00 00 00 90 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec d0 00 00 00 49 89 d0 48 85 f6 0f 84
RSP: 002b:00007ffcdf8a8b40 EFLAGS: 00000293 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f33d529c740 RCX: 00007f33d52de189
RDX: 00005644060a25e0 RSI: 00007ffcdf8a8c70 RDI: 0000000000000011
RBP: 00007ffcdf8a9410 R08: 0000000000000008 R09: 0000000000000000
R10: 00007ffcdf8a9410 R11: 0000000000000293 R12: 00005644060a25e0
R13: 0000564433ca3df0 R14: 00000000ffffffff R15: 00007ffcdf8a91c0