INFO: task udevd:5854 blocked for more than 143 seconds.
Not tainted 6.14.0-rc4-syzkaller-00177-ga466fd7e9faf #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:25176 pid:5854 tgid:5854 ppid:5209 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0x190e/0x4c90 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6857
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914
__mutex_lock_common kernel/locking/mutex.c:662 [inline]
__mutex_lock+0x817/0x1010 kernel/locking/mutex.c:730
device_lock include/linux/device.h:1030 [inline]
uevent_show+0x17d/0x340 drivers/base/core.c:2729
dev_attr_show+0x55/0xc0 drivers/base/core.c:2423
sysfs_kf_seq_show+0x331/0x4c0 fs/sysfs/file.c:59
seq_read_iter+0x43f/0xd70 fs/seq_file.c:230
new_sync_read fs/read_write.c:484 [inline]
vfs_read+0x975/0xb40 fs/read_write.c:565
ksys_read+0x18f/0x2b0 fs/read_write.c:708
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd195f16b6a
RSP: 002b:00007fff5d9131e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 000055e9eacab220 RCX: 00007fd195f16b6a
RDX: 0000000000001000 RSI: 000055e9eacc9490 RDI: 0000000000000008
RBP: 000055e9eacab220 R08: 0000000000000008 R09: 0000000000000000
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000003fff R14: 00007fff5d9136c8 R15: 000000000000000a
INFO: task khidpd_04590009:5860 blocked for more than 143 seconds.
Not tainted 6.14.0-rc4-syzkaller-00177-ga466fd7e9faf #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:khidpd_04590009 state:D stack:28432 pid:5860 tgid:5860 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0x190e/0x4c90 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6857
schedule_timeout+0xb0/0x290 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+0x355/0x620 kernel/sched/completion.c:148
__flush_work+0xa47/0xc60 kernel/workqueue.c:4244
__cancel_work_sync+0xbc/0x110 kernel/workqueue.c:4364
hidp_session_remove+0x64/0x260 net/bluetooth/hidp/core.c:1169
l2cap_unregister_user+0x19c/0x1c0 net/bluetooth/l2cap_core.c:1733
hidp_session_thread+0x450/0x490 net/bluetooth/hidp/core.c:1304
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
INFO: task syz-executor224:5907 blocked for more than 144 seconds.
Not tainted 6.14.0-rc4-syzkaller-00177-ga466fd7e9faf #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor224 state:D
stack:26992 pid:5907 tgid:5906 ppid:5852 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0x190e/0x4c90 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6857
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914
__mutex_lock_common kernel/locking/mutex.c:662 [inline]
__mutex_lock+0x817/0x1010 kernel/locking/mutex.c:730
l2cap_chan_connect+0xff/0xeb0 net/bluetooth/l2cap_core.c:6919
l2cap_sock_connect+0x620/0x950 net/bluetooth/l2cap_sock.c:256
__sys_connect_file net/socket.c:2045 [inline]
__sys_connect+0x288/0x2d0 net/socket.c:2064
__do_sys_connect net/socket.c:2070 [inline]
__se_sys_connect net/socket.c:2067 [inline]
__x64_sys_connect+0x7a/0x90 net/socket.c:2067
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fae36930b19
RSP: 002b:00007fae360e1218 EFLAGS: 00000246
ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007fae369b33e8 RCX: 00007fae36930b19
RDX: 000000000000000e RSI: 0000400000000080 RDI: 0000000000000004
RBP: 00007fae369b33e0 R08: 000000000000001f R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000400000000140
R13: 0000400000000100 R14: 0000400000000150 R15: 0000400000000144
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0:
ffffffff8eb38fa0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
ffffffff8eb38fa0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
ffffffff8eb38fa0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746
6 locks held by kworker/0:2/973:
2 locks held by getty/5588:
#0:
ffff88803549a0a0
(
&tty->ldisc_sem
){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1:
ffffc90002fde2f0
(
&ldata->atomic_read_lock
){+.+.}-{4:4}
, at: n_tty_read+0x616/0x1770 drivers/tty/n_tty.c:2211
4 locks held by udevd/5854:
#0:
ffff88807f8898b8
(
&p->lock
){+.+.}-{4:4}
, at: seq_read_iter+0xb4/0xd70 fs/seq_file.c:182
#1:
ffff888034555488
(
&of->mutex
#2
){+.+.}-{4:4}
, at: kernfs_seq_start+0x53/0x3b0 fs/kernfs/file.c:154
#2:
ffff88803327e878
(
kn->active
#5
){.+.+}-{0:0}
, at: kernfs_seq_start+0x72/0x3b0 fs/kernfs/file.c:155
#3:
ffff88807f4f5a20
(
&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:1030 [inline]
, at: uevent_show+0x17d/0x340 drivers/base/core.c:2729
2 locks held by khidpd_04590009/5860:
#0:
ffff888030d98078
(
&hdev->lock
){+.+.}-{4:4}
, at: l2cap_unregister_user+0x6a/0x1c0 net/bluetooth/l2cap_core.c:1727
#1:
ffffffff90063710
(
hidp_session_sem
){++++}-{4:4}
, at: hidp_session_remove+0x2d/0x260 net/bluetooth/hidp/core.c:1165
1 lock held by syz-executor224/5907:
#0:
ffff888030d98078 (&hdev->lock){+.+.}-{4:4}, at: l2cap_chan_connect+0xff/0xeb0 net/bluetooth/l2cap_core.c:6919
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.14.0-rc4-syzkaller-00177-ga466fd7e9faf #0
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+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:399
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 973 Comm: kworker/0:2 Not tainted 6.14.0-rc4-syzkaller-00177-ga466fd7e9faf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events hidp_session_dev_work
RIP: 0010:io_serial_in+0x76/0xb0 drivers/tty/serial/8250/8250_port.c:409
Code: f0 e1 3d fc 89 e9 41 d3 e6 48 83 c3 40 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 c1 1b a5 fc 44 03 33 44 89 f2 ec <0f> b6 c0 5b 41 5e 41 5f 5d c3 cc cc cc cc 89 e9 80 e1 07 38 c1 7c
RSP: 0018:ffffc900044f6bd8 EFLAGS: 00000006
RAX: 1ffffffff3532c05 RBX: ffffffff9a9960a0 RCX: 0000000000000000
RDX: 00000000000003f9 RSI: 0000000000000000 RDI: 0000000000000020
RBP: 0000000000000000 R08: ffffffff8583dd46 R09: fffff5200089ed5c
R10: dffffc0000000000 R11: ffffffff8583dd00 R12: 0000000000000000
R13: dffffc0000000000 R14: 00000000000003f9 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fae3692e7b3 CR3: 000000000e938000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
serial_port_in include/linux/serial_core.h:791 [inline]
serial8250_console_write+0x4be/0x1e00 drivers/tty/serial/8250/8250_port.c:3429
console_emit_next_record kernel/printk/printk.c:3122 [inline]
console_flush_all+0x869/0xeb0 kernel/printk/printk.c:3210
__console_flush_and_unlock kernel/printk/printk.c:3269 [inline]
console_unlock+0x14f/0x3b0 kernel/printk/printk.c:3309
vprintk_emit+0x730/0xa10 kernel/printk/printk.c:2432
dev_vprintk_emit+0x341/0x400 drivers/base/core.c:4890
dev_printk_emit+0xdd/0x120 drivers/base/core.c:4901
_dev_warn+0x122/0x170 drivers/base/core.c:4957
hid_parser_main+0x812/0xc00 drivers/hid/hid-core.c:660
hid_open_report+0xbd8/0x1580 drivers/hid/hid-core.c:1324
hid_parse include/linux/hid.h:1124 [inline]
hid_generic_probe+0x3d/0x90 drivers/hid/hid-generic.c:66
__hid_device_probe drivers/hid/hid-core.c:2713 [inline]
hid_device_probe+0x3bf/0x710 drivers/hid/hid-core.c:2750
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+0x24e/0x2e0 drivers/base/bus.c:462
__device_attach+0x333/0x520 drivers/base/dd.c:1030
bus_probe_device+0x189/0x260 drivers/base/bus.c:537
device_add+0x856/0xbf0 drivers/base/core.c:3665
hid_add_device+0x3b6/0x520 drivers/hid/hid-core.c:2896
hidp_session_dev_add net/bluetooth/hidp/core.c:856 [inline]
hidp_session_dev_work+0x46/0x160 net/bluetooth/hidp/core.c:895
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xabe/0x18e0 kernel/workqueue.c:3319
worker_thread+0x870/0xd30 kernel/workqueue.c:3400
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.236 msecs