INFO: task syz-executor.0:6168 blocked for more than 143 seconds.
Not tainted 6.16.0-rc7-syzkaller-g5f33ebd2018c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:21640 pid:6168 tgid:6168 ppid:1 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5397 [inline]
__schedule+0x16fd/0x4cf0 kernel/sched/core.c:6786
__schedule_loop kernel/sched/core.c:6864 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6879
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6936
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x724/0xe80 kernel/locking/mutex.c:747
fuse_lock_inode+0xd3/0x120 fs/fuse/inode.c:594
fuse_lookup+0x18a/0x640 fs/fuse/dir.c:434
__lookup_slow+0x297/0x3d0 fs/namei.c:1817
lookup_slow+0x53/0x70 fs/namei.c:1834
walk_component fs/namei.c:2138 [inline]
link_path_walk+0x935/0xea0 fs/namei.c:2506
path_openat+0x28c/0x3830 fs/namei.c:4051
do_filp_open+0x1fa/0x410 fs/namei.c:4082
do_sys_openat2+0x121/0x1c0 fs/open.c:1437
do_sys_open fs/open.c:1452 [inline]
__do_sys_openat fs/open.c:1468 [inline]
__se_sys_openat fs/open.c:1463 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1463
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: 0033:0x7f4580c7c391
RSP: 002b:00007ffdfdde7750 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f4580c7c391
RDX: 0000000000090800 RSI: 00007f4580cd7b46 RDI: 00000000ffffff9c
RBP: 00007ffdfdde781c R08: 0000000000000000 R09: 7fffffffffffffff
R10: 0000000000000000 R11: 0000000000000287 R12: 0000000000000000
R13: 000000000001abff R14: 000000000001abcc R15: 0000000000000008
INFO: task syz-executor.0:6227 blocked for more than 143 seconds.
Not tainted 6.16.0-rc7-syzkaller-g5f33ebd2018c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:25128 pid:6227 tgid:6222 ppid:6168 task_flags:0x400040 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5397 [inline]
__schedule+0x16fd/0x4cf0 kernel/sched/core.c:6786
__schedule_loop kernel/sched/core.c:6864 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6879
request_wait_answer fs/fuse/dev.c:565 [inline]
__fuse_request_send fs/fuse/dev.c:579 [inline]
__fuse_simple_request+0xf15/0x18d0 fs/fuse/dev.c:673
fuse_simple_request fs/fuse/fuse_i.h:1237 [inline]
fuse_lookup_name+0x34c/0x860 fs/fuse/dir.c:388
fuse_lookup+0x1e9/0x640 fs/fuse/dir.c:435
__lookup_slow+0x297/0x3d0 fs/namei.c:1817
lookup_slow+0x53/0x70 fs/namei.c:1834
walk_component fs/namei.c:2138 [inline]
link_path_walk+0x935/0xea0 fs/namei.c:2506
path_openat+0x28c/0x3830 fs/namei.c:4051
do_filp_open+0x1fa/0x410 fs/namei.c:4082
do_sys_openat2+0x121/0x1c0 fs/open.c:1437
do_sys_open fs/open.c:1452 [inline]
__do_sys_openat fs/open.c:1468 [inline]
__se_sys_openat fs/open.c:1463 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1463
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: 0033:0x7f4580c7b5e0
RSP: 002b:00007f45819c0e20 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f4580c7b5e0
RDX: 0000000000000002 RSI: 00007f45819c0f40 RDI: 00000000ffffff9c
RBP: 00007f45819c0f40 R08: 0000000000000000 R09: 00000000000010f7
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000005
R13: 00007f45819c0f3c R14: 00007f45819c0f40 R15: 00007f4577a00000
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e13f0e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13f0e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e13f0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
2 locks held by kworker/u8:5/1157:
2 locks held by getty/5600:
#0: ffff88814c6c60a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900036cb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
2 locks held by syz-executor.0/6168:
#0: ffff888072038148 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:884 [inline]
#0: ffff888072038148 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: lookup_slow+0x46/0x70 fs/namei.c:1833
#1: ffff888072038608 (&fi->mutex){+.+.}-{4:4}, at: fuse_lock_inode+0xd3/0x120 fs/fuse/inode.c:594
2 locks held by syz-executor.0/6227:
#0: ffff888072038148 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:884 [inline]
#0: ffff888072038148 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: lookup_slow+0x46/0x70 fs/namei.c:1833
#1: ffff888072038608 (&fi->mutex){+.+.}-{4:4}, at: fuse_lock_inode+0xd3/0x120 fs/fuse/inode.c:594
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc7-syzkaller-g5f33ebd2018c #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:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:470
kthread+0x711/0x8a0 kernel/kthread.c:464
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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6156 Comm: syz-execprog Not tainted 6.16.0-rc7-syzkaller-g5f33ebd2018c #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:debug_spin_unlock kernel/locking/spinlock_debug.c:101 [inline]
RIP: 0010:do_raw_spin_unlock+0x64/0x240 kernel/locking/spinlock_debug.c:141
Code: 0f 85 f3 00 00 00 48 89 df be 04 00 00 00 e8 23 58 83 00 48 89 d8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 74 01 00 00 83 3b 00 <0f> 84 ea 00 00 00 4c 8d 73 10 4d 89 f5 49 c1 ed 03 43 80 7c 25 00
RSP: 0018:ffffc90002e57ac8 EFLAGS: 00000002
RAX: 0000000000000000 RBX: ffffffff99ca5e90 RCX: ffffffff819ee32d
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff99ca5e90
RBP: ffffc90002e57b80 R08: ffffffff99ca5e93 R09: 1ffffffff3394bd2
R10: dffffc0000000000 R11: fffffbfff3394bd3 R12: dffffc0000000000
R13: 0000000000000002 R14: ffffffff99ca5e94 R15: 1ffff920005caf60
FS: 000000c000060098(0000) GS:ffff888125c23000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005632ff696168 CR3: 0000000075943000 CR4: 0000000000350ef0
Call Trace:
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:150 [inline]
_raw_spin_unlock_irqrestore+0x78/0x110 kernel/locking/spinlock.c:194
debug_hrtimer_init_on_stack kernel/time/hrtimer.c:439 [inline]
debug_setup_on_stack kernel/time/hrtimer.c:477 [inline]
hrtimer_setup_sleeper_on_stack+0x24/0x80 kernel/time/hrtimer.c:2067
futex_setup_timer+0x48/0xd0 kernel/futex/core.c:468
futex_wait+0xe8/0x360 kernel/futex/waitwake.c:712
do_futex+0x333/0x420 kernel/futex/syscalls.c:102
__do_sys_futex kernel/futex/syscalls.c:179 [inline]
__se_sys_futex+0x36f/0x400 kernel/futex/syscalls.c:160
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: 0033:0x47efe3
Code: 24 20 c3 cc cc cc cc 48 8b 7c 24 08 8b 74 24 10 8b 54 24 14 4c 8b 54 24 18 4c 8b 44 24 20 44 8b 4c 24 28 b8 ca 00 00 00 0f 05 <89> 44 24 30 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc
RSP: 002b:000000c000041e80 EFLAGS: 00000202 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047efe3
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 0000000001fb6e40
RBP: 000000c000041ec8 R08: 0000000000000000 R09: 0000000000000000
R10: 000000c000041eb8 R11: 0000000000000202 R12: 000000c000041eb8
R13: 000000c0009ee808 R14: 000000c000002700 R15: 000000c000476fc0