INFO: task udevd:5839 blocked for more than 143 seconds.
Not tainted 6.15.0-rc3-syzkaller-00099-g49ba1ca2e0cc #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D
stack:23576 pid:5839 tgid:5839 ppid:5202 task_flags:0x400140 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x16e2/0x4cd0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x724/0xe80 kernel/locking/mutex.c:746
device_lock include/linux/device.h:922 [inline]
uevent_show+0x174/0x330 drivers/base/core.c:2730
dev_attr_show+0x55/0xc0 drivers/base/core.c:2424
sysfs_kf_seq_show+0x30d/0x490 fs/sysfs/file.c:65
seq_read_iter+0x4e7/0xe10 fs/seq_file.c:230
new_sync_read fs/read_write.c:489 [inline]
vfs_read+0x4cd/0x980 fs/read_write.c:570
ksys_read+0x145/0x250 fs/read_write.c:713
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd6d5d8bb6a
RSP: 002b:00007fffe7e65ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00005639725cb670 RCX: 00007fd6d5d8bb6a
RDX: 0000000000001000 RSI: 000056397259f620 RDI: 0000000000000008
RBP: 00005639725cb670 R08: 0000000000000008 R09: 0000000000000020
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000003fff R14: 00007fffe7e661c8 R15: 000000000000000a
INFO: task khidpd_07c00a0f:7325 blocked for more than 144 seconds.
Not tainted 6.15.0-rc3-syzkaller-00099-g49ba1ca2e0cc #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:khidpd_07c00a0f state:D stack:28328 pid:7325 tgid:7325 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x16e2/0x4cd0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6860
schedule_timeout+0x9a/0x270 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+0x2bf/0x5d0 kernel/sched/completion.c:148
__flush_work+0x9b9/0xbc0 kernel/workqueue.c:4244
__cancel_work_sync+0xbe/0x110 kernel/workqueue.c:4364
hidp_session_remove+0x62/0x260 net/bluetooth/hidp/core.c:1169
l2cap_unregister_user+0x18b/0x1b0 net/bluetooth/l2cap_core.c:1733
hidp_session_thread+0x3c9/0x410 net/bluetooth/hidp/core.c:1304
kthread+0x70e/0x8a0 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
Showing all locks held in the system:
8 locks held by kworker/0:0/9:
1 lock held by khungtaskd/31:
#0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6764
2 locks held by getty/5594:
#0: ffff8880305070a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002ffe2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
4 locks held by udevd/5839:
#0: ffff88807f90e9e0 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb7/0xe10 fs/seq_file.c:182
#1: ffff888021f78488 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x55/0x3c0 fs/kernfs/file.c:154
#2: ffff888057592788 (kn->active#5){.+.+}-{0:0}, at: kernfs_seq_start+0x75/0x3c0 fs/kernfs/file.c:155
#3: ffff8880577d1a20 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#3: ffff8880577d1a20 (&dev->mutex){....}-{4:4}, at: uevent_show+0x174/0x330 drivers/base/core.c:2730
1 lock held by syz-executor/5840:
2 locks held by khidpd_07c00a0f/7325:
#0: ffff888032bac078 (&hdev->lock){+.+.}-{4:4}, at: l2cap_unregister_user+0x6a/0x1b0 net/bluetooth/l2cap_core.c:1727
#1: ffffffff8f481cf0 (hidp_session_sem){++++}-{4:4}, at: hidp_session_remove+0x2c/0x260 net/bluetooth/hidp/core.c:1165
1 lock held by syz.2.628/8210:
#0: ffff888032bac078 (&hdev->lock){+.+.}-{4:4}, at: l2cap_chan_connect+0x102/0xe30 net/bluetooth/l2cap_core.c:6955
1 lock held by syz.2.628/8212:
#0:
ffff888032bac078 (
&hdev->lock){+.+.}-{4:4}, at: l2cap_chan_connect+0x102/0xe30 net/bluetooth/l2cap_core.c:6955
1 lock held by syz.3.644/8276:
#0: ffff888032bac078 (&hdev->lock){+.+.}-{4:4}, at: l2cap_chan_connect+0x102/0xe30 net/bluetooth/l2cap_core.c:6955
1 lock held by syz.1.995/9558:
#0:
ffffffff8f481cf0
(
hidp_session_sem
){++++}-{4:4}
, at: hidp_session_find+0x1a/0x100 net/bluetooth/hidp/core.c:1026
1 lock held by syz.6.1411/11019:
#0:
ffffffff8f481cf0
(
hidp_session_sem
){++++}-{4:4}
, at: hidp_session_find+0x1a/0x100 net/bluetooth/hidp/core.c:1026
1 lock held by syz.4.1499/11303:
#0: ffffffff8f481cf0
(
hidp_session_sem
){++++}-{4:4}
, at: hidp_session_find+0x1a/0x100 net/bluetooth/hidp/core.c:1026
1 lock held by syz.7.1529/11401:
#0: ffff888032bac078 (&hdev->lock){+.+.}-{4:4}, at: hci_inquiry+0x27a/0x610 net/bluetooth/hci_core.c:343
1 lock held by syz.5.1531/11411:
#0: ffffffff8f481cf0 (hidp_session_sem){++++}-{4:4}, at: hidp_session_find+0x1a/0x100 net/bluetooth/hidp/core.c:1026
1 lock held by syz.5.1531/11414:
#0: ffffffff8f481cf0 (hidp_session_sem){++++}-{4:4}, at: hidp_session_find+0x1a/0x100 net/bluetooth/hidp/core.c:1026
1 lock held by syz.8.1560/11534:
#0: ffffffff8df41338 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:304 [inline]
#0: ffffffff8df41338 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f4/0x730 kernel/rcu/tree_exp.h:998
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc3-syzkaller-00099-g49ba1ca2e0cc #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
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:274 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:437
kthread+0x70e/0x8a0 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: 9 Comm: kworker/0:0 Not tainted 6.15.0-rc3-syzkaller-00099-g49ba1ca2e0cc #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Workqueue: events hidp_session_dev_work
RIP: 0010:in_irqentry_text kernel/stacktrace.c:379 [inline]
RIP: 0010:filter_irq_stacks+0x52/0xa0 kernel/stacktrace.c:397
Code: f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 d4 fd 74 00 49 8b 04 de 48 3d 30 02 00 81 0f 93 c1 48 3d 70 16 00 81 0f 92 c2 <84> d1 75 27 48 3d 90 0b 58 8b 0f 92 c1 48 3d ab 0b 58 8b 0f 93 c0
RSP: 0018:ffffc90000007850 EFLAGS: 00000202
RAX: ffffffff8216f183 RBX: 0000000000000003 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000022 RDI: ffffc900000078f0
RBP: ffffc90000007b18 R08: 000000000000000f R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff817199f5 R12: 0000000000000022
R13: dffffc0000000000 R14: ffffc900000078f0 R15: ffffc90000007908
FS: 0000000000000000(0000) GS:ffff8881260cf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbbebbb4440 CR3: 000000000dd36000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
stack_depot_save_flags+0x40/0x910 lib/stackdepot.c:610
kasan_save_stack mm/kasan/common.c:48 [inline]
kasan_save_track+0x4f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x62/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2398 [inline]
slab_free mm/slub.c:4656 [inline]
kfree+0x193/0x440 mm/slub.c:4855
slab_free_after_rcu_debug+0x62/0x290 mm/slub.c:4693
rcu_do_batch kernel/rcu/tree.c:2568 [inline]
rcu_core+0xca5/0x1710 kernel/rcu/tree.c:2824
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2061 [inline]
RIP: 0010:vprintk_emit+0x58f/0x7a0 kernel/printk/printk.c:2449
Code: 85 32 01 00 00 e8 21 f2 1e 00 41 89 df 4d 85 f6 48 8b 1c 24 75 07 e8 10 f2 1e 00 eb 06 e8 09 f2 1e 00 fb 48 c7 c7 80 fa f2 8d <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 f9 3f
RSP: 0018:ffffc900000e7100 EFLAGS: 00000293
RAX: ffffffff81a0cb77 RBX: ffffffff81a0ca34 RCX: ffff88801bee8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8df2fa80
RBP: ffffc900000e7210 R08: ffffffff8f7ebf77 R09: 1ffffffff1efd7ee
R10: dffffc0000000000 R11: fffffbfff1efd7ef R12: dffffc0000000000
R13: 1ffff9200001ce24 R14: 0000000000000200 R15: 000000000000003a
dev_vprintk_emit+0x337/0x3f0 drivers/base/core.c:4891
dev_printk_emit+0xe0/0x130 drivers/base/core.c:4902
_dev_warn+0x10a/0x160 drivers/base/core.c:4958
hid_parser_main+0x8b8/0xc40 drivers/hid/hid-core.c:-1
hid_open_report+0x858/0xee0 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+0x397/0x710 drivers/hid/hid-core.c:2754
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26a/0x9a0 drivers/base/dd.c:658
__driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:800
driver_probe_device+0x4f/0x430 drivers/base/dd.c:830
__device_attach_driver+0x2ce/0x530 drivers/base/dd.c:958
bus_for_each_drv+0x24e/0x2e0 drivers/base/bus.c:462
__device_attach+0x2b8/0x400 drivers/base/dd.c:1030
bus_probe_device+0x185/0x260 drivers/base/bus.c:537
device_add+0x7b6/0xb50 drivers/base/core.c:3666
hid_add_device+0x398/0x540 drivers/hid/hid-core.c:2900
hidp_session_dev_add net/bluetooth/hidp/core.c:856 [inline]
hidp_session_dev_work+0x45/0x160 net/bluetooth/hidp/core.c:895
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x70e/0x8a0 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