INFO: task syz.3.1883:12830 blocked for more than 143 seconds.
Not tainted 6.11.0-rc2-syzkaller-00387-g2984e69a24af #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1883 state:D stack:24672 pid:12830 tgid:12830 ppid:12404 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5188 [inline]
__schedule+0x1800/0x4a60 kernel/sched/core.c:6529
__schedule_loop kernel/sched/core.c:6606 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6621
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
pipe_release+0x4e/0x330 fs/pipe.c:727
__fput+0x24a/0x8a0 fs/file_table.c:422
task_work_run+0x24f/0x310 kernel/task_work.c:228
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x168/0x370 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f780f5799b9
RSP: 002b:00007ffc22d756d8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f780f717a80 RCX: 00007f780f5799b9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f780f717a80 R08: 0000000000000006 R09: 00007ffc22d759bf
R10: 00000000003ffbc4 R11: 0000000000000246 R12: 000000000006d96d
R13: 00007ffc22d757d0 R14: 00007ffc22d757f0 R15: ffffffffffffffff
INFO: task syz.3.1883:12833 blocked for more than 144 seconds.
Not tainted 6.11.0-rc2-syzkaller-00387-g2984e69a24af #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1883 state:D stack:26592 pid:12833 tgid:12830 ppid:12404 flags:0x00000000
Call Trace:
context_switch kernel/sched/core.c:5188 [inline]
__schedule+0x1800/0x4a60 kernel/sched/core.c:6529
__schedule_loop kernel/sched/core.c:6606 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6621
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
pipe_ioctl+0xa0/0x480 fs/pipe.c:622
vfs_ioctl fs/ioctl.c:51 [inline]
do_vfs_ioctl+0xece/0x2e50 fs/ioctl.c:861
__do_sys_ioctl fs/ioctl.c:905 [inline]
__se_sys_ioctl+0x81/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f780f5799b9
RSP: 002b:00007f781033d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f780f716058 RCX: 00007f780f5799b9
RDX: 0000000000000000 RSI: 000000000000541b RDI: 0000000000000006
RBP: 00007f780f5e78d8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f780f716058 R15: 00007ffc22d75578
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e9382a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
#0: ffffffff8e9382a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8e9382a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6626
6 locks held by dhcpcd/4895:
2 locks held by getty/4980:
#0: ffff88802f6190a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000312b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ac/0x1e00 drivers/tty/n_tty.c:2211
4 locks held by syz-executor/12404:
2 locks held by syz-executor/12612:
1 lock held by syz.3.1883/12830:
#0: ffff88805b700468 (&pipe->mutex){+.+.}-{3:3}, at: pipe_release+0x4e/0x330 fs/pipe.c:727
1 lock held by syz.3.1883/12831:
#0: ffff88805b700468 (&pipe->mutex){+.+.}-{3:3}, at: splice_file_to_pipe+0x2e/0x500 fs/splice.c:1292
1 lock held by syz.3.1883/12833:
#0: ffff88805b700468 (&pipe->mutex){+.+.}-{3:3}, at: pipe_ioctl+0xa0/0x480 fs/pipe.c:622
2 locks held by syz.0.1898/12881:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc2-syzkaller-00387-g2984e69a24af #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:379
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 101 PID: 5041 Comm: dhcpcd Not tainted 6.11.0-rc2-syzkaller-00387-g2984e69a24af #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:lockdep_hardirqs_on+0x6b/0x150 kernel/locking/lockdep.c:4408
Code: 8b 05 89 4f 4c 74 85 c0 75 74 65 8b 05 36 4c 4c 74 85 c0 75 69 83 3d 73 3e 3c 09 00 75 2e 48 c7 04 24 00 00 00 00 9c 8f 04 24 04 24 00 02 00 00 75 67 83 3d 55 3e 3c 09 00 75 10 48 8b 83 b8
RSP: 0018:ffffc900031b7eb0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8880212e1e00 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8c0ae6e0 RDI: ffffffff8bb5d850
RBP: ffffc900031b7f48 R08: ffffffff9017d12f R09: 1ffffffff202fa25
R10: dffffc0000000000 R11: fffffbfff202fa26 R12: ffff8880212e1e00
R13: 0000000000000000 R14: ffffffff8bb5d850 R15: ffffffffffffffff
FS: 00007f2e83e60740(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe16d761d8 CR3: 000000007b3d2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
exit_to_user_mode include/linux/entry-common.h:365 [inline]
syscall_exit_to_user_mode+0x21e/0x370 kernel/entry/common.c:220
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2e83f2dad5
Code: 85 d2 74 0d 0f 10 02 48 8d 54 24 20 0f 11 44 24 20 64 8b 04 25 18 00 00 00 85 c0 75 27 41 b8 08 00 00 00 b8 0f 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 75 48 8b 15 24 73 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffe16d75d10 EFLAGS: 00000246
RAX: fffffffffffffffc RBX: 00005627abc74e20 RCX: 00007f2e83f2dad5
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00005627abc872d0
RBP: 00007ffe16d76060 R08: 0000000000000008 R09: 0000000000000000
R10: 00007ffe16d76060 R11: 0000000000000246 R12: 0000000000000000
R13: 000056279989b610 R14: 00000000ffffffff R15: 0000000000000000