INFO: task syz.3.390:7603 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.390 state:D stack:25400 pid:7603 tgid:7603 ppid:5832 task_flags:0x400040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x14bc/0x5000 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6960
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7017
__mutex_lock_common kernel/locking/mutex.c:692 [inline]
__mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:776
pipe_release+0x48/0x330 fs/pipe.c:729
__fput+0x44c/0xa70 fs/file_table.c:468
task_work_run+0x1d4/0x260 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
exit_to_user_mode_loop+0xff/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+0x2d0/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f441238f749
RSP: 002b:00007fff59f69798 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f44125e7da0 RCX: 00007f441238f749
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f44125e7da0 R08: 0000000000000184 R09: 0000001759f69a8f
R10: 00007f44125e7cb0 R11: 0000000000000246 R12: 000000000001c630
R13: 00007f44125e6090 R14: ffffffffffffffff R15: 00007fff59f698b0
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8df41a20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8df41a20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8df41a20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by udevd/5203:
1 lock held by dhcpcd/5497:
2 locks held by getty/5593:
#0: ffff8880345ad0a0 (&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+0x449/0x1460 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/5820:
1 lock held by syz-executor/5839:
1 lock held by syz.3.390/7603:
#0: ffff88807a942c68 (&pipe->mutex){+.+.}-{4:4}, at: pipe_release+0x48/0x330 fs/pipe.c:729
1 lock held by syz.3.390/7605:
#0: ffff88807a942c68 (&pipe->mutex){+.+.}-{4:4}, at: splice_file_to_pipe+0x2e/0x440 fs/splice.c:1289
1 lock held by syz.1.411/7690:
1 lock held by syz.1.411/7691:
1 lock held by syz.1.411/7692:
1 lock held by udevd/7705:
=============================================
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 10/25/2025
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]
__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+0xf95/0xfe0 kernel/hung_task.c:515
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:246
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 101 PID: 5497 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:mark_lock+0x95/0x190 kernel/locking/lockdep.c:4731
Code: 83 3d 22 88 e3 0d 00 75 13 48 8d 3d e5 a1 e6 0d 48 c7 c6 17 29 87 8d 67 48 0f b9 3a 90 31 c9 4c 89 fe 4c 89 f7 b8 01 00 00 00 <85> 69 60 74 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 49
RSP: 0018:ffffc90000a086f8 EFLAGS: 00000006
RAX: 0000000000000001 RBX: 0000000000000009 RCX: ffffffff93276928
RDX: 0000000000000008 RSI: ffff88802dd348a8 RDI: ffff88802dd33d00
RBP: 0000000000000200 R08: ffffffff81743f85 R09: ffffffff8df41a20
R10: ffffc90000a08a38 R11: ffffffff81ada120 R12: 0000000000000003
R13: ffff88802dd348a8 R14: ffff88802dd33d00 R15: 0000000000000003
FS: 00007f9de441b740(0000) GS:ffff888125f35000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0861af2000 CR3: 000000007ce3a000 CR4: 00000000003526f0
Call Trace:
mark_usage kernel/locking/lockdep.c:4674 [inline]
__lock_acquire+0x6b6/0x2cf0 kernel/locking/lockdep.c:5191
lock_acquire+0x117/0x340 kernel/locking/lockdep.c:5868
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:867 [inline]
class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0xc2/0x23d0 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:56 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
unpoison_slab_object mm/kasan/common.c:339 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:365
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4953 [inline]
slab_alloc_node mm/slub.c:5263 [inline]
kmem_cache_alloc_noprof+0x37d/0x710 mm/slub.c:5270
sigqueue_alloc kernel/signal.c:455 [inline]
__send_signal_locked+0x22a/0xeb0 kernel/signal.c:1087
do_send_sig_info kernel/signal.c:1269 [inline]
group_send_sig_info+0x1fd/0x260 kernel/signal.c:1419
do_bpf_send_signal+0xa9/0x1c0 kernel/trace/bpf_trace.c:813
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+0x98/0x3a0 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:733
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:37 [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 72 01 56 03 66
RSP: 0018:ffffc900033b7ae8 EFLAGS: 00000246
RAX: 00000000000000f6 RBX: 0000000000000200 RCX: 000000000000083f
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000083f
RBP: ffffc900033b7bc0 R08: ffffc900033b7b47 R09: 1ffff92000676f68
R10: dffffc0000000000 R11: fffff52000676f69 R12: ffff8880b8731c01
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880b8731c70
__apic_send_IPI_self arch/x86/include/asm/apic.h:459 [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+0x1d7/0x530 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:871
____bpf_send_signal kernel/trace/bpf_trace.c:880 [inline]
bpf_send_signal+0x1d/0x30 kernel/trace/bpf_trace.c:878
bpf_prog_948316cddd0b7b1c+0x41/0x49
bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline]
bpf_trace_run2+0x284/0x4c0 kernel/trace/bpf_trace.c:2116
__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+0x9a/0xf0 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:78 [inline]
syscall_enter_from_user_mode include/linux/entry-common.h:109 [inline]
do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:90
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9de445d189
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:00007ffc4655c240 EFLAGS: 00000293 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f9de441b740 RCX: 00007f9de445d189
RDX: 000055ae78f055e0 RSI: 00007ffc4655c370 RDI: 0000000000000011
RBP: 00007ffc46560f80 R08: 0000000000000008 R09: 0000000000000000
R10: 00007ffc46560f80 R11: 0000000000000293 R12: 000055ae78f055e0
R13: 000055ae928a7390 R14: 00000000ffffffff R15: 0000000000000000