INFO: task syz.1.1038:9663 blocked for more than 143 seconds.
Not tainted 6.16.0-syzkaller-12122-g3b5ca25ecfa8 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1038 state:D stack:25096 pid:9663 tgid:9663 ppid:5870 task_flags:0x400040 flags:0x00004002
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+0x7e6/0x1360 kernel/locking/mutex.c:760
pipe_release+0x48/0x330 fs/pipe.c:727
__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+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: 0033:0x7f91fdf8ebe9
RSP: 002b:00007ffe3b730468 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f91fe1b7da0 RCX: 00007f91fdf8ebe9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f91fe1b7da0 R08: 0000000000018fcc R09: 0000001d3b73075f
R10: 00007f91fe1b7cb0 R11: 0000000000000246 R12: 000000000003a04c
R13: 00007f91fe1b5fa0 R14: ffffffffffffffff R15: 00007ffe3b730580
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by kworker/1:2/121:
1 lock held by udevd/5233:
2 locks held by getty/5622:
#0: ffff88803420a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900036bb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by sshd-session/5849:
1 lock held by syz-executor/5850:
1 lock held by syz-executor/5875:
1 lock held by syz.1.1038/9663:
#0: ffff888030860c68 (&pipe->mutex){+.+.}-{4:4}, at: pipe_release+0x48/0x330 fs/pipe.c:727
1 lock held by syz.1.1038/9668:
#0: ffff888030860c68 (&pipe->mutex){+.+.}-{4:4}, at: splice_file_to_pipe+0x2e/0x440 fs/splice.c:1286
1 lock held by syz.3.1044/9688:
1 lock held by syz.3.1044/9691:
1 lock held by syz.3.1044/9697:
2 locks held by dhcpcd-run-hook/9695:
1 lock held by syz-executor/9696:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-syzkaller-12122-g3b5ca25ecfa8 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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+0x3fc/0x770 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: 0 PID: 9661 Comm: dhcpcd-run-hook Not tainted 6.16.0-syzkaller-12122-g3b5ca25ecfa8 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:should_fail_usercopy+0x9/0x20 lib/fault-inject-usercopy.c:37
Code: fd eb a9 cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa e8 97 0a c3 fc 01 00 00 00 48 c7 c7 60 89 8d 8e e9 f6 ed ff ff cc cc cc cc cc
RSP: 0018:ffffc9000400fc98 EFLAGS: 00000293
RAX: ffffffff84fca119 RBX: 00000000000000c0 RCX: ffff8880644e8000
RDX: 0000000000000000 RSI: ffffffff8dba39e3 RDI: ffffffff8be32680
RBP: ffffc9000400fee0 R08: 0000000000000000 R09: ffffffff820b7950
R10: ffffc9000400fd20 R11: fffff52000801fc4 R12: ffffc9000400fd20
R13: 1ffff92000801ffe R14: ffffc9000400fd20 R15: 00007ffe9dc22768
FS: 00007fe8a1790c80(0000) GS:ffff888125d21000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6a08fb6098 CR3: 0000000056796000 CR4: 00000000003526f0
Call Trace:
_inline_copy_from_user include/linux/uaccess.h:163 [inline]
_copy_from_user+0x2d/0xb0 lib/usercopy.c:18
copy_from_user include/linux/uaccess.h:212 [inline]
restore_sigcontext arch/x86/kernel/signal_64.c:59 [inline]
__ia32_sys_rt_sigreturn+0x228/0x7b0 arch/x86/kernel/signal_64.c:268
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe8a1898189
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:00007ffe9dc22740 EFLAGS: 00000246 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007ffe9dc22d08 RCX: 00007fe8a1898189
RDX: 00007ffe9dc22740 RSI: 00007ffe9dc22870 RDI: 0000000000000011
RBP: 00000000000025df R08: 00007fe8a1a2bb60 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 000055a4c5c90290
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000