INFO: task hung in emon (2)

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: task hung in emon usb	1				1	295d	295d	0/29	auto-obsoleted due to no activity on 2025/01/31 07:56
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device[ 1036.270638][   T31] INFO: task kworker/0:1:10 blocked for more than 143 seconds.

Apr  6 03:50:2[ 1036.278898][   T31]       Not tainted 6.14.0-syzkaller-13524-gf4d2ef48250a #0
4 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkal[ 1036.316462][   T31] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
ler daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 [ 1036.346447][   T31] task:kworker/0:1     state:D stack:23784 pid:10    tgid:10    ppid:2      task_flags:0x4208060 flags:0x00004000
syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:[ 1036.378794][   T31] Workqueue: usb_hub_wq hub_event
50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller daemon.err dhc[ 1036.392899][   T31] Call Trace:
pcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: lib[ 1036.405586][   T31]  <TASK>
udev: received NULL device
Apr  6 03:50:24 syzk[ 1036.413460][   T31]  context_switch kernel/sched/core.c:5382 [inline]
Apr  6 03:50:24 syzk[ 1036.413460][   T31]  __schedule+0x116f/0x5de0 kernel/sched/core.c:6767
aller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 sy[ 1036.424646][   T31]  ? __lock_acquire+0x5ca/0x1ba0 kernel/locking/lockdep.c:5232
zkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 [ 1036.436848][   T31]  ? __pfx___schedule+0x10/0x10 usercopy_64.c:-1
syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:2[ 1036.448213][   T31]  ? find_held_lock+0x2b/0x80 kernel/locking/lockdep.c:5348
4 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller da[ 1036.461411][   T31]  ? sched_submit_work kernel/sched/core.c:6826 [inline]
Apr  6 03:50:24 syzkaller da[ 1036.461411][   T31]  ? schedule+0x2d7/0x3a0 kernel/sched/core.c:6859
emon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller [ 1036.472165][   T31]  __schedule_loop kernel/sched/core.c:6845 [inline]
Apr  6 03:50:24 syzkaller [ 1036.472165][   T31]  schedule+0xe7/0x3a0 kernel/sched/core.c:6860
daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkalle[ 1036.484086][   T31]  usb_kill_urb drivers/usb/core/urb.c:713 [inline]
Apr  6 03:50:24 syzkalle[ 1036.484086][   T31]  usb_kill_urb+0x253/0x320 drivers/usb/core/urb.c:699
r daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkal[ 1036.495838][   T31]  ? __pfx_usb_kill_urb+0x10/0x10 drivers/usb/core/urb.c:928
ler daemon.err d[ 1036.501409][T18740] Bluetooth: hci5: command 0x1003 tx timeout
hcpcd[5491]: libudev: received N[ 1036.501453][ T5834] Bluetooth: hci5: Opcode 0x1003 failed: -110
ULL device
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL de[ 1036.553783][   T31]  ? __pfx_autoremove_wake_function+0x10/0x10 include/linux/list.h:196
vice
Apr  6 03:50:24 syzkaller daemon.err dhcpcd[5491]: libudev: received NULL device
Apr  6 0[ 1036.565865][   T31]  usb_start_wait_urb+0x250/0x4b0 drivers/usb/core/message.c:65
3:50:24 syzkalle[ 1036.568037][   T31]  ? __pfx_usb_start_wait_urb+0x10/0x10 drivers/usb/core/message.c:37
r daemon.err dhc[ 1036.568078][   T31]  ? __asan_memset+0x23/0x50 mm/kasan/shadow.c:84
pcd[5491]: libud[ 1036.568109][   T31]  usb_internal_control_msg drivers/usb/core/message.c:103 [inline]
pcd[5491]: libud[ 1036.568109][   T31]  usb_control_msg+0x326/0x4a0 drivers/usb/core/message.c:154
ev: received NUL[ 1036.568179][   T31]  ? __pfx_usb_control_msg+0x10/0x10 drivers/usb/core/message.c:68
L device
Apr  6 03:50:24 syzkal[ 1036.601741][   T31]  get_bMaxPacketSize0.constprop.0+0xd0/0x1f0 drivers/usb/core/hub.c:4815
ler daemon.err d[ 1036.609573][   T31]  hub_port_init+0x690/0x3a70 drivers/usb/core/hub.c:5011
hcpcd[5491]: lib[ 1036.615695][   T31]  hub_port_connect drivers/usb/core/hub.c:5460 [inline]
hcpcd[5491]: lib[ 1036.615695][   T31]  hub_port_connect_change drivers/usb/core/hub.c:5671 [inline]
hcpcd[5491]: lib[ 1036.615695][   T31]  port_event drivers/usb/core/hub.c:5831 [inline]
hcpcd[5491]: lib[ 1036.615695][   T31]  hub_event+0x2c67/0x4fa0 drivers/usb/core/hub.c:5913
udev: received N[ 1036.621435][   T31]  ? __pfx_hub_event+0x10/0x10 drivers/usb/core/hub.c:4666
ULL device
Apr [ 1036.628115][   T31]  ? debug_object_deactivate+0x1ec/0x3a0 lib/debugobjects.c:888
 6 03:50:24 syzk[ 1036.634662][   T31]  ? rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
 6 03:50:24 syzk[ 1036.634662][   T31]  ? rcu_is_watching+0x12/0xc0 kernel/rcu/tree.c:736
aller daemon.err[ 1036.640817][   T31]  process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
 dhcpcd[5491]: l[ 1036.647219][   T31]  ? __pfx_hcd_resume_work+0x10/0x10 drivers/usb/core/hcd.c:2482
Apr  6 03:50:24 [ 1036.653916][   T31]  ? __pfx_process_one_work+0x10/0x10 arch/x86/include/asm/bitops.h:206
syzkaller daemon[ 1036.660641][   T31]  ? assign_work+0x1a0/0x250 kernel/workqueue.c:1200
.err dhcpcd[5491[ 1036.666672][   T31]  process_scheduled_works kernel/workqueue.c:3319 [inline]
.err dhcpcd[5491[ 1036.666672][   T31]  worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
]: libudev: rece[ 1036.672691][   T31]  ? __pfx_worker_thread+0x10/0x10 include/linux/list.h:183
ived NULL device[ 1036.679058][   T31]  kthread+0x3c2/0x780 kernel/kthread.c:464

Apr  6 03:50:2[ 1036.679086][   T31]  ? __pfx_kthread+0x10/0x10 arch/x86/include/asm/bitops.h:206
4 syzkaller daem[ 1036.690624][   T31]  ? __pfx_kthread+0x10/0x10 arch/x86/include/asm/bitops.h:206
on.err dhcpcd[54[ 1036.696576][   T31]  ? __pfx_kthread+0x10/0x10 arch/x86/include/asm/bitops.h:206
Apr  6 03:50:24 [ 1036.702747][   T31]  ? __pfx_kthread+0x10/0x10 arch/x86/include/asm/bitops.h:206
Apr  6 03:50:24 Apr  6 03:50:24 Apr  6 03:50:24 Apr  6 03:50:24 [ 1036.702773][   T31]  ? rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
Apr  6 03:50:24 Apr  6 03:50:24 Apr  6 03:50:24 Apr  6 03:50:24 [ 1036.702773][   T31]  ? rcu_is_watching+0x12/0xc0 kernel/rcu/tree.c:736
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/04/06 03:37	upstream	f4d2ef48250a	1c65791e	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-kasan-gce-selinux-root	INFO: task hung in emon
2025/02/21 22:42	upstream	334426094588	0808a665	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-kasan-gce-selinux-root	INFO: task hung in emon