INFO: task syz.8.981:9144 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.8.981 state:D stack:26432 pid:9144 tgid:9143 ppid:8129 task_flags:0x400140 flags:0x00080002
Call Trace:
__schedu[ 498.637073][ T38] context_switch kernel/sched/core.c:5388 [inline]
__schedu[ 498.637073][ T38] __schedule+0x16d8/0x55e0 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7283
fuse_wait_aborted+0x175/0x420 fs/fuse/dev.c:2546
fuse_conn_destroy+0x193/0x390 fs/fuse/inode.c:2120
fuse_sb_destroy fs/fuse/inode.c:2139 [inline]
fuse_kill_sb_anon+0x210/0x290 fs/fuse/inode.c:2152
deactivate_locked_super+0xbc/0x130 fs/super.c:476
vfs_get_super fs/super.c:1338 [inline]
get_tree_nodev+0xd7/0x150 fs/super.c:1346
fuse_get_tree+0x28c/0x3a0 fs/fuse/inode.c:2055
vfs_get_tree+0x92/0x2a0 fs/super.c:1754
fc_mount fs/namespace.c:1193 [inline]
do_new_mount_fc fs/namespace.c:3761 [inline]
do_new_mount+0x319/0xdc0 fs/namespace.c:3837
do_mount fs/namespace.c:4170 [inline]
__do_sys_mount fs/namespace.c:4386 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4363
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f812194ce59
RSP: 002b:00007f811fb9e028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f8121bc5fa0 RCX: 00007f812194ce59
RDX: 00002000000020c0 RSI: 0000200000002080 RDI: 0000000000000000
RBP: 00007f81219e2d6f R08: 00002000000003c0 R09: 0000000000000000
R10: 0000000000000413 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8121bc6038 R14: 00007f8121bc5fa0 R15: 00007ffd7c78c948
Showing all locks held in the system:
6 locks held by kworker/0:1/10:
#0: ffff888021af5138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline]
#0: ffff888021af5138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3397
#1: ffffc900000f7c40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline]
#1: ffffc900000f7c40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3397
#2: ffff888029a5c210 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1040 [inline]
#2: ffff888029a5c210 (&dev->mutex){....}-{4:4}, at: hub_event+0x187/0x4cf0 drivers/usb/core/hub.c:5899
#3: ffff888035af4210 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1040 [inline]
#3: ffff888035af4210 (&dev->mutex){....}-{4:4}, at: usb_disconnect+0xe3/0x990 drivers/usb/core/hub.c:2336
#4: ffff88803f8eb1d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1040 [inline]
#4: ffff88803f8eb1d8 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1174 [inline]
#4: ffff88803f8eb1d8 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb9/0x880 drivers/base/dd.c:1372
#5: ffff88801eef5318 (&(&priv->bus_notifier)->rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x54/0x90 kernel/notifier.c:379
2 locks held by kdevtmpfs/33:
#0: ffff88801c294480 (sb_writers){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
#1: ffff88801aef4e38 (&type->i_mutex_dir_key/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1074 [inline]
#1: ffff88801aef4e38 (&type->i_mutex_dir_key/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2914 [inline]
#1: ffff88801aef4e38 (&type->i_mutex_dir_key/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2938 [inline]
#1: ffff88801aef4e38 (&type->i_mutex_dir_key/1){+.+.}-{4:4}, at: __start_removing_path+0x1bc/0x310 fs/namei.c:2973
1 lock held by khungtaskd/38:
#0: ffffffff8ddc7b60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8ddc7b60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8ddc7b60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5364:
#0: ffff8880367db0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003cc62e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1390 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/7362:
#0: ffff888037788480 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
1 lock held by udevd/8041:
#0: ffff888037142480 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
1 lock held by udevd/8156:
#0: ffff88801c294480 (sb_writers){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
1 lock held by syz.8.981/9144:
#0: ffff888039c960d0 (&type->s_umount_key#82/1){+.+.}-{4:4}, at: alloc_super+0x283/0xa70 fs/super.c:345
1 lock held by syz.7.1882/11510:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd7/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 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: 11510 Comm: syz.7.1882 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:find_held_lock kernel/locking/lockdep.c:5350 [inline]
RIP: 0010:__lock_release kernel/locking/lockdep.c:5535 [inline]
RIP: 0010:lock_release+0x101/0x3c0 kernel/locking/lockdep.c:5889
Code: 8d 60 ff 49 8d af f8 0b 00 00 4d 63 ec 48 89 04 24 83 f8 32 0f 83 2a 02 00 00 4a 8d 1c ad 00 00 00 00 4c 01 eb 48 8d 6c dd 00 <48> 89 ef 4c 89 f6 e8 f4 f1 76 09 44 89 64 24 14 45 89 e5 85 c0 0f
RSP: 0018:ffffc90003d5f5b8 EFLAGS: 00000006
RAX: 0000000000000002 RBX: 0000000000000005 RCX: 0000000000000046
RDX: ffffffff8feb7f00 RSI: ffffffff8d416ded RDI: ffffffff8b873ba0
RBP: ffff8880253849a0 R08: ffffc90003d5ff48 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8ddc7b60 R12: 0000000000000001
R13: 0000000000000001 R14: ffffffff8ddc7b60 R15: ffff888025383d80
FS: 00007f39168a66c0(0000) GS:ffff8881264a1000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0ccacf6658 CR3: 000000003ac5a000 CR4: 00000000003526f0
Call Trace:
rcu_lock_release include/linux/rcupdate.h:310 [inline]
rcu_read_unlock include/linux/rcupdate.h:869 [inline]
class_rcu_destructor include/linux/rcupdate.h:1181 [inline]
unwind_next_frame+0x1baa/0x2550 arch/x86/kernel/unwind_orc.c:709
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2689 [inline]
slab_free mm/slub.c:6251 [inline]
kfree+0x1c5/0x6c0 mm/slub.c:6566
io_clean_op+0x298/0x330 io_uring/io_uring.c:325
io_free_batch_list io_uring/io_uring.c:1129 [inline]
__io_submit_flush_completions+0xd4d/0xf80 io_uring/io_uring.c:1167
io_submit_flush_completions io_uring/io_uring.h:251 [inline]
io_submit_state_end io_uring/io_uring.c:1952 [inline]
io_submit_sqes+0x1cec/0x2310 io_uring/io_uring.c:2076
__do_sys_io_uring_enter io_uring/io_uring.c:2651 [inline]
__se_sys_io_uring_enter+0x364/0x1be0 io_uring/io_uring.c:2600
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f391864ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f39168a6028 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 00007f39188c5fa0 RCX: 00007f391864ce59
RDX: 0000000000007721 RSI: 0000000000002219 RDI: 0000000000000000
RBP: 00007f39186e2d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000016 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f39188c6038 R14: 00007f39188c5fa0 R15: 00007ffe5a9915a8