INFO: task syz.4.1238:10433 blocked for more than 143 seconds.
Not tainted 6.15.0-rc2-syzkaller-00042-g1a1d569a75f3 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1238 state:D stack:24200 pid:10433 tgid:10433 ppid:9936 task_flags:0x400040 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b88/0x5240 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6860
schedule_timeout+0xb1/0x2b0 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion+0x32f/0x600 kernel/sched/completion.c:148
__flush_work+0xa48/0xc60 kernel/workqueue.c:4244
__cancel_work_sync+0xbc/0x110 kernel/workqueue.c:4364
uhid_dev_destroy drivers/hid/uhid.c:584 [inline]
uhid_char_release+0xac/0x600 drivers/hid/uhid.c:662
__fput+0x3e9/0x9f0 fs/file_table.c:465
task_work_run+0x251/0x310 kernel/task_work.c:227
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:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc19038e169
RSP: 002b:00007fc1906dfb88 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fc1905b7ba0 RCX: 00007fc19038e169
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fc1905b7ba0 R08: 0000000000000000 R09: 0000001e906dfe7f
R10: 00007fc1905b7ac0 R11: 0000000000000246 R12: 00000000000714ee
R13: 00007fc1905b6080 R14: ffffffffffffffff R15: 00007fc1906dfca0
Showing all locks held in the system:
2 locks held by kworker/u8:0/12:
#0: ffff88801eab5148 (
(wq_completion)iou_exit){+.+.}-{0:0}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:613
#1: ffff8880b8723b08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x41f/0x7a0 kernel/sched/psi.c:987
1 lock held by khungtaskd/31:
#0: ffffffff8ed3dfa0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8ed3dfa0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8ed3dfa0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x30/0x180 kernel/locking/lockdep.c:6764
6 locks held by kworker/0:2/975:
#0: ffff888144683548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff888144683548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x990/0x18e0 kernel/workqueue.c:3319
#1: ffffc90003907c60 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc90003907c60 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9cb/0x18e0 kernel/workqueue.c:3319
#2: ffff888145b02198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#2: ffff888145b02198 (&dev->mutex){....}-{4:4}, at: hub_event+0x200/0x50f0 drivers/usb/core/hub.c:5859
#3: ffff888032c85198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#3: ffff888032c85198 (&dev->mutex){....}-{4:4}, at: usb_disconnect+0x103/0x960 drivers/usb/core/hub.c:2307
#4:
ffff88807ea38160 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
ffff88807ea38160 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1095 [inline]
ffff88807ea38160 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xce/0x7c0 drivers/base/dd.c:1293
#5:
ffffffff8fb83808 (input_mutex){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:201 [inline]
ffffffff8fb83808 (input_mutex){+.+.}-{4:4}, at: __input_unregister_device+0x2ff/0x630 drivers/input/input.c:2221
2 locks held by getty/5594:
#0:
ffff8880359220a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x5bb/0x1700 drivers/tty/n_tty.c:2222
1 lock held by syz-executor/5856:
#0: ffffffff8ed434b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline]
#0: ffffffff8ed434b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x454/0x830 kernel/rcu/tree_exp.h:998
3 locks held by kworker/0:3/5895:
2 locks held by syz.3.1619/11799:
#0: ffff888078448e08 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#0: ffff888078448e08 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: __sock_release net/socket.c:646 [inline]
#0: ffff888078448e08 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: sock_close+0x90/0x240 net/socket.c:1391
#1: ffff88807d032258 (sk_lock-AF_CAN){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1651 [inline]
#1: ffff88807d032258 (sk_lock-AF_CAN){+.+.}-{0:0}, at: bcm_release+0x1eb/0x950 net/can/bcm.c:1571
3 locks held by syz.1.1622/11813:
#0:
ffff88802a3da160 (&mousedev->mutex
#2){+.+.}-{4:4}, at: mousedev_close_device+0x2e/0xe0 drivers/input/mousedev.c:441
#1:
ffff88802a3d92c0 (&dev->mutex#2
){+.+.}-{4:4}
, at: class_mutex_constructor include/linux/mutex.h:201 [inline]
, at: input_close_device+0x4b/0x260 drivers/input/input.c:645
#2: ffffffff8ed434b8 (rcu_state.exp_mutex){+.+.}-{4:4}
, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline]
, at: synchronize_rcu_expedited+0x454/0x830 kernel/rcu/tree_exp.h:998
2 locks held by syz.1.1622/11815:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc2-syzkaller-00042-g1a1d569a75f3 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x4ab/0x4e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:437
kthread+0x7b7/0x940 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
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: 5895 Comm: kworker/0:3 Not tainted 6.15.0-rc2-syzkaller-00042-g1a1d569a75f3 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events uhid_device_add_worker
RIP: 0010:serial8250_console_write+0x1229/0x1e00 drivers/tty/serial/8250/8250_port.c:3446
Code: c0 20 d0 68 93 65 48 8b 00 48 3b 84 24 80 01 00 00 0f 85 e2 0b 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc <49> 8d 9f 08 01 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48
RSP: 0018:ffffc900041bebe0 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 0000000000000081 RCX: ffff888030eb9e00
RDX: ffff888030eb9e00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900041bedb0 R08: ffffffff859755dc R09: fffff52000837d58
R10: dffffc0000000000 R11: ffffffff85978a50 R12: ffffffff9aa84df0
R13: dffffc0000000000 R14: 1ffffffff35509be R15: ffffffff9aa84b40
FS: 0000000000000000(0000) GS:ffff888124f93000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb9d097fab8 CR3: 0000000033b36000 CR4: 00000000003526f0
DR0: 0000000000000680 DR1: 0000000000000003 DR2: 0000000000000007
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
console_emit_next_record kernel/printk/printk.c:3138 [inline]
console_flush_all+0x86b/0xec0 kernel/printk/printk.c:3226
__console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
console_unlock+0x151/0x3b0 kernel/printk/printk.c:3325
vprintk_emit+0x761/0xa40 kernel/printk/printk.c:2450
dev_vprintk_emit+0x358/0x420 drivers/base/core.c:4891
dev_printk_emit+0xdf/0x130 drivers/base/core.c:4902
_dev_warn+0x12d/0x180 drivers/base/core.c:4958
hid_parser_main+0x896/0xc40 drivers/hid/hid-core.c:-1
hid_open_report+0xbda/0x1590 drivers/hid/hid-core.c:1328
hid_parse include/linux/hid.h:1126 [inline]
hid_generic_probe+0x3d/0x90 drivers/hid/hid-generic.c:66
__hid_device_probe drivers/hid/hid-core.c:2717 [inline]
hid_device_probe+0x3bf/0x710 drivers/hid/hid-core.c:2754
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2b9/0xad0 drivers/base/dd.c:658
__driver_probe_device+0x1a2/0x390 drivers/base/dd.c:800
driver_probe_device+0x50/0x430 drivers/base/dd.c:830
__device_attach_driver+0x2d6/0x530 drivers/base/dd.c:958
bus_for_each_drv+0x258/0x2e0 drivers/base/bus.c:462
__device_attach+0x341/0x530 drivers/base/dd.c:1030
bus_probe_device+0x189/0x260 drivers/base/bus.c:537
device_add+0x856/0xbf0 drivers/base/core.c:3666
hid_add_device+0x3b6/0x520 drivers/hid/hid-core.c:2900
uhid_device_add_worker+0x44/0xf0 drivers/hid/uhid.c:73
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
worker_thread+0x870/0xd50 kernel/workqueue.c:3400
kthread+0x7b7/0x940 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245