INFO: task syz.0.2256:14418 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.2256 state:D stack:24584 pid:14418 tgid:14418 ppid:5839 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+0x449/0xa70 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: 0033:0x7f6adcb8eec9
RSP: 002b:00007fffe48d84e8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f6adcde7da0 RCX: 00007f6adcb8eec9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f6adcde7da0 R08: 0000000000000eb0 R09: 00000011e48d87df
R10: 00007f6adcde7cb0 R11: 0000000000000246 R12: 0000000000059eb5
R13: 00007f6adcde6270 R14: ffffffffffffffff R15: 00007fffe48d8600
INFO: task syz.0.2256:14429 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.2256 state:D stack:28904 pid:14429 tgid:14418 ppid:5839 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_ioctl+0xc4/0x490 fs/pipe.c:626
vfs_ioctl fs/ioctl.c:51 [inline]
do_vfs_ioctl+0xe67/0x1430 fs/ioctl.c:551
__do_sys_ioctl fs/ioctl.c:595 [inline]
__se_sys_ioctl+0x82/0x170 fs/ioctl.c:583
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: 0033:0x7f6adcb8eec9
RSP: 002b:00007f6addaba038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6adcde6090 RCX: 00007f6adcb8eec9
RDX: 0000000000000000 RSI: 000000000000541b RDI: 0000000000000007
RBP: 00007f6adcc11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6adcde6128 R14: 00007f6adcde6090 R15: 00007fffe48d8388
INFO: task syz.0.2256:14433 blocked for more than 146 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.2256 state:D stack:28616 pid:14433 tgid:14418 ppid:5839 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: 0033:0x7f6adcb8eec9
RSP: 002b:00007f6adda99038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f6adcde6180 RCX: 00007f6adcb8eec9
RDX: 0000000000000001 RSI: 0000200000000000 RDI: 0000000000000007
RBP: 00007f6adcc11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6adcde6218 R14: 00007f6adcde6180 R15: 00007fffe48d8388
Showing all locks held in the system:
2 locks held by kworker/0:0/9:
1 lock held by khungtaskd/31:
#0: ffffffff8e13d320 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13d320 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8e13d320 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5587:
#0: ffff88814d98d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900036be2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by syz.0.2256/14418:
#0: ffff88804784b068 (&pipe->mutex){+.+.}-{4:4}, at: pipe_release+0x48/0x330 fs/pipe.c:729
1 lock held by syz.0.2256/14419:
#0: ffff88804784b068 (&pipe->mutex){+.+.}-{4:4}, at: splice_file_to_pipe+0x2e/0x440 fs/splice.c:1289
1 lock held by syz.0.2256/14429:
#0: ffff88804784b068 (&pipe->mutex){+.+.}-{4:4}, at: pipe_ioctl+0xc4/0x490 fs/pipe.c:626
1 lock held by syz.0.2256/14433:
#0: ffff88804784b068 (&pipe->mutex){+.+.}-{4:4}, at: anon_pipe_write+0x15d/0x1460 fs/pipe.c:458
1 lock held by syz.5.2265/14451:
1 lock held by syz.5.2265/14468:
=============================================
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 10/02/2025
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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5827 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:__might_fault+0x5/0x130 mm/memory.c:7076
Code: e8 60 bd b2 ff 48 89 df 31 f6 e8 e6 09 fd ff e9 e8 fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <41> 57 41 56 41 55 41 54 53 89 f5 49 89 fe 49 bc 00 00 00 00 00 fc
RSP: 0018:ffffc9000410f910 EFLAGS: 00000293
RAX: ffffffff8168d83d RBX: 00007fffd0138340 RCX: ffff88803045dac0
RDX: 0000000000000000 RSI: 00000000000000b5 RDI: ffffffff8d80f827
RBP: ffffc9000410faf0 R08: ffffffff8f9e0f77 R09: 1ffffffff1f3c1ee
R10: dffffc0000000000 R11: fffffbfff1f3c1ef R12: 00007fffd0138140
R13: dffffc0000000000 R14: 00007fffd0138140 R15: ffff88803045dac0
FS: 000055558bcaa500(0000) GS:ffff888125e0f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffb2cc2000 CR3: 0000000077ef4000 CR4: 00000000003526f0
Call Trace:
__clear_user arch/x86/include/asm/uaccess_64.h:181 [inline]
copy_fpstate_to_sigframe+0x13a/0xce0 arch/x86/kernel/fpu/signal.c:203
get_sigframe+0x58d/0x7d0 arch/x86/kernel/signal.c:163
x64_setup_rt_frame+0x15b/0xd40 arch/x86/kernel/signal_64.c:175
setup_rt_frame arch/x86/kernel/signal.c:250 [inline]
handle_signal arch/x86/kernel/signal.c:294 [inline]
arch_do_signal_or_restart+0x3f1/0x790 arch/x86/kernel/signal.c:339
exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40
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: 0033:0x7fbb5a585017
Code: 89 7c 24 10 48 89 4c 24 18 e8 65 1c 03 00 4c 8b 54 24 18 8b 54 24 14 41 89 c0 48 8b 74 24 08 8b 7c 24 10 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 89 44 24 10 e8 b5 1c 03 00 8b 44
RSP: 002b:00007fffd0138510 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000588 RCX: 00007fbb5a585017
RDX: 0000000040000001 RSI: 00007fffd013857c RDI: 00000000ffffffff
RBP: 00007fffd013857c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000001388
R13: 00000000000927c0 R14: 000000000005a25c R15: 00007fffd01385d0