INFO: task syz.4.3828:19933 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.3828 state:D stack:24584 pid:19933 tgid:19933 ppid:17486 task_flags:0x400040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7026
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083
__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:729
__fput+0x44c/0xa70 fs/file_table.c:468
task_work_run+0x1d4/0x260 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xe9/0x130 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/0xfa0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff8daf8efc9
RSP: 002b:00007ffe88903288 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ff8db1e7da0 RCX: 00007ff8daf8efc9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007ff8db1e7da0 R08: 0000000000000228 R09: 0000001d8890357f
R10: 00007ff8db1e7cb0 R11: 0000000000000246 R12: 00000000000765da
R13: 00007ff8db1e6270 R14: ffffffffffffffff R15: 00007ffe889033a0
INFO: task syz.4.3828:19948 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.3828 state:D stack:28904 pid:19948 tgid:19933 ppid:17486 task_flags:0x400040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7026
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083
__mutex_lock_common kernel/locking/mutex.c:676 [inline]
__mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760
anon_pipe_write+0x15d/0x1460 fs/pipe.c:458
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x5c9/0xb30 fs/read_write.c:686
ksys_write+0x145/0x250 fs/read_write.c:738
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: 0033:0x7ff8daf8efc9
RSP: 002b:00007ff8dbe0a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ff8db1e6180 RCX: 00007ff8daf8efc9
RDX: 00000000ffffff98 RSI: 0000200000000000 RDI: 000000000000000d
RBP: 00007ff8db011f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff8db1e6218 R14: 00007ff8db1e6180 R15: 00007ffe88903128
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8df3d2e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8df3d2e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8df3d2e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5591:
#0: ffff88814dca40a0 (&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 syz-executor/15938:
1 lock held by syz-executor/16674:
1 lock held by syz-executor/17105:
1 lock held by syz-executor/17908:
1 lock held by syz.4.3828/19933:
#0: ffff888055c4d868 (&pipe->mutex){+.+.}-{4:4}, at: pipe_release+0x48/0x330 fs/pipe.c:729
1 lock held by syz.4.3828/19937:
#0: ffff888055c4d868 (&pipe->mutex){+.+.}-{4:4}, at: splice_file_to_pipe+0x2e/0x440 fs/splice.c:1289
1 lock held by syz.4.3828/19948:
#0: ffff888055c4d868 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1460 fs/pipe.c:458
1 lock held by syz.3.3839/19986:
1 lock held by syz.3.3839/19987:
=============================================
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:332 [inline]
watchdog+0xf60/0xfa0 kernel/hung_task.c:495
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 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: 5817 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:unwind_next_frame+0x521/0x2390 arch/x86/kernel/unwind_orc.c:512
Code: 63 18 00 00 0f b7 1e c1 eb 0b 80 e3 01 48 8b 44 24 28 0f b6 04 28 84 c0 4c 8b 7c 24 70 0f 85 6d 18 00 00 48 8b 44 24 10 88 18 <0f> b7 1e 83 e3 0f 83 fb 05 0f 8f 85 00 00 00 83 fb 03 0f 8f 01 01
RSP: 0018:ffffc900000078f8 EFLAGS: 00000046
RAX: ffffc900000079fd RBX: 0000000000000000 RCX: ffffffff8f90eff8
RDX: ffffffff900b99be RSI: ffffffff900b99c2 RDI: ffffffff8bbf0800
RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff81738d25
R10: ffffc90000007a18 R11: ffffffff81ac2cd0 R12: ffffffff900b99c3
R13: ffffc90000007a18 R14: ffffc900000079c8 R15: ffffc90000007a00
FS: 0000555573676500(0000) GS:ffff888126140000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f93f11e5fa8 CR3: 0000000078154000 CR4: 00000000003526f0
Call Trace:
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:342 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:368
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4955 [inline]
slab_alloc_node mm/slub.c:5265 [inline]
kmem_cache_alloc_noprof+0x367/0x6e0 mm/slub.c:5272
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+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:733
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 e9 d0 40 d6 09 cc f3 0f 1e fa 89 f6 31 d2 e9 f2 10 50 03 66
RSP: 0018:ffffc90003ce7ae8 EFLAGS: 00000246
RAX: 00000000000000f6 RBX: 0000000000000200 RCX: 000000000000083f
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000083f
RBP: ffffc90003ce7bc0 R08: ffffc90003ce7b47 R09: 1ffff9200079cf68
R10: dffffc0000000000 R11: fffff5200079cf69 R12: ffff8880b8831401
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880b88314f0
__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+0x1d7/0x550 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: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:1350 [inline]
__bpf_prog_run include/linux/filter.h:721 [inline]
bpf_prog_run include/linux/filter.h:728 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline]
bpf_trace_run2+0x284/0x4b0 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+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+0xd3/0xfa0 arch/x86/entry/syscall_64.c:90
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f76f132b099
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 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 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007ffcb430fa40 EFLAGS: 00000202 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007ffcb4310100 RCX: 00007f76f132b099
RDX: 00007ffcb430fa40 RSI: 00007ffcb430fb70 RDI: 0000000000000011
RBP: 00007ffcb4310340 R08: 00007ffcb4310000 R09: 00007ffcb4310010
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffcb43103a0
R13: 0000000000000000 R14: 00007ffcb4310550 R15: 00007ffcb4310190