INFO: task syz-executor.0:4471 blocked for more than 143 seconds.
Not tainted 5.15.178-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:20152 pid: 4471 ppid: 1 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5027 [inline]
__schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
schedule+0x11b/0x1f0 kernel/sched/core.c:6456
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6515
__mutex_lock_common+0xe34/0x25a0 kernel/locking/mutex.c:669
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
fuse_lock_inode+0xcf/0x120 fs/fuse/inode.c:491
fuse_lookup+0x111/0x600 fs/fuse/dir.c:427
__lookup_slow+0x275/0x3d0 fs/namei.c:1663
lookup_slow+0x53/0x70 fs/namei.c:1680
walk_component+0x48c/0x610 fs/namei.c:1976
link_path_walk+0x642/0xd90
path_openat+0x249/0x2f20 fs/namei.c:3738
do_filp_open+0x21c/0x460 fs/namei.c:3769
do_sys_openat2+0x13b/0x4f0 fs/open.c:1253
do_sys_open fs/open.c:1269 [inline]
__do_sys_openat fs/open.c:1285 [inline]
__se_sys_openat fs/open.c:1280 [inline]
__x64_sys_openat+0x243/0x290 fs/open.c:1280
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f38c5200581
RSP: 002b:00007ffea4267730 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f38c5200581
RDX: 0000000000090800 RSI: 00007f38c524b45d RDI: 00000000ffffff9c
RBP: 00007ffea42677fc R08: 0000000000000000 R09: 0000000000000010
R10: 0000000000000000 R11: 0000000000000287 R12: 0000000000000000
R13: 0000000000013ec9 R14: 0000000000013e6b R15: 0000000000000006
</TASK>
INFO: task syz-executor.0:4565 blocked for more than 143 seconds.
Not tainted 5.15.178-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:24408 pid: 4565 ppid: 4471 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5027 [inline]
__schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
schedule+0x11b/0x1f0 kernel/sched/core.c:6456
request_wait_answer fs/fuse/dev.c:411 [inline]
__fuse_request_send fs/fuse/dev.c:430 [inline]
fuse_simple_request+0x112f/0x1a00 fs/fuse/dev.c:515
fuse_lookup_name+0x356/0x900 fs/fuse/dir.c:383
fuse_lookup+0x17e/0x600 fs/fuse/dir.c:428
__lookup_slow+0x275/0x3d0 fs/namei.c:1663
lookup_slow+0x53/0x70 fs/namei.c:1680
walk_component+0x48c/0x610 fs/namei.c:1976
link_path_walk+0x642/0xd90
path_openat+0x249/0x2f20 fs/namei.c:3738
do_filp_open+0x21c/0x460 fs/namei.c:3769
do_sys_openat2+0x13b/0x4f0 fs/open.c:1253
do_sys_open fs/open.c:1269 [inline]
__do_sys_openat fs/open.c:1285 [inline]
__se_sys_openat fs/open.c:1280 [inline]
__x64_sys_openat+0x243/0x290 fs/open.c:1280
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f38c51ff720
RSP: 002b:00007f38c4560e20 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f38c51ff720
RDX: 0000000000000002 RSI: 00007f38c4560f40 RDI: 00000000ffffff9c
RBP: 00007f38c4560f40 R08: 0000000000000000 R09: 00000000000004a0
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000004
R13: 00007f38c4560f3c R14: 00007f38c4560f40 R15: 00007f38bc141000
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8cb1fce0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3932:
#0: ffff88814c768098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc900025ae2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1db0 drivers/tty/n_tty.c:2158
2 locks held by syz-executor.0/4471:
#0: ffff888070540150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:799 [inline]
#0: ffff888070540150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x45/0x70 fs/namei.c:1679
#1: ffff8880705405b8 (&fi->mutex){+.+.}-{3:3}, at: fuse_lock_inode+0xcf/0x120 fs/fuse/inode.c:491
2 locks held by syz-executor.0/4565:
#0: ffff888070540150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:799 [inline]
#0: ffff888070540150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x45/0x70 fs/namei.c:1679
#1: ffff8880705405b8 (&fi->mutex){+.+.}-{3:3}, at: fuse_lock_inode+0xcf/0x120 fs/fuse/inode.c:491
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
watchdog+0xe72/0xeb0 kernel/hung_task.c:295
kthread+0x3f6/0x4f0 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 144 Comm: kworker/u4:1 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: 0x0 (bat_events)
RIP: 0010:account_idle_time+0x0/0x120 kernel/sched/cputime.c:220
Code: 48 89 df e8 42 5c 70 00 4c 01 33 5b 41 5c 41 5e 41 5f c3 48 c7 c7 e0 61 9e 8c 48 89 de e8 48 8f db 02 eb 9c 66 0f 1f 44 00 00 <41> 57 41 56 41 55 41 54 53 49 89 fe e8 2f 51 e5 08 89 c3 83 f8 08
RSP: 0018:ffffc900010cfaf8 EFLAGS: 00000002
RAX: dffffc0000000000 RBX: ffffffff8c8bd680 RCX: 1ffffffff1f14200
RDX: 1ffffffff1f14200 RSI: ffffffff8af9f2a0 RDI: 0000000000277af7
RBP: 000000000000fb52 R08: ffffffff8f8a1000 R09: ffffffff8f8a1008
R10: ffffffff8f8a1018 R11: ffffffff8f8a1010 R12: 1ffffffff1917bba
R13: 1ffffffff1917bbb R14: 0000000000277af7 R15: ffffffff8c8bddd0
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055da1e656600 CR3: 000000001fd6d000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
vtime_account_idle kernel/sched/cputime.c:767 [inline]
vtime_task_switch_generic+0x179/0x580 kernel/sched/cputime.c:776
vtime_task_switch include/linux/vtime.h:95 [inline]
finish_task_switch+0x3ea/0x630 kernel/sched/core.c:4895
context_switch kernel/sched/core.c:5030 [inline]
__schedule+0x12cc/0x45b0 kernel/sched/core.c:6373
schedule+0x11b/0x1f0 kernel/sched/core.c:6456
worker_thread+0xf56/0x1280 kernel/workqueue.c:2478
kthread+0x3f6/0x4f0 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>