INFO: task udevd:5217 blocked for more than 143 seconds.
Not tainted 6.15.0-rc1-syzkaller-00082-gf41f7b3d9daf #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:24536 pid:5217 tgid:5217 ppid:2839 task_flags:0x400140 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x132a/0x3b00 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 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+0x6c7/0xb90 kernel/locking/mutex.c:746
device_lock include/linux/device.h:922 [inline]
uevent_show+0x187/0x3b0 drivers/base/core.c:2730
dev_attr_show+0x53/0xe0 drivers/base/core.c:2424
sysfs_kf_seq_show+0x213/0x3e0 fs/sysfs/file.c:65
seq_read_iter+0x506/0x12b0 fs/seq_file.c:230
kernfs_fop_read_iter+0x422/0x5a0 fs/kernfs/file.c:279
new_sync_read fs/read_write.c:489 [inline]
vfs_read+0x8c8/0xc70 fs/read_write.c:570
ksys_read+0x12a/0x240 fs/read_write.c:713
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb03b9efb6a
RSP: 002b:00007fff9bd3c798 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00005639a131a0e0 RCX: 00007fb03b9efb6a
RDX: 0000000000001000 RSI: 00005639a1313850 RDI: 0000000000000008
RBP: 00005639a131a0e0 R08: 0000000000000008 R09: 0000000000000004
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000003fff R14: 00007fff9bd3cc78 R15: 000000000000000a
INFO: task udevd:5217 is blocked on a mutex likely owned by task kworker/0:2:2900.
task:kworker/0:2 state:R
running task stack:21816 pid:2900 tgid:2900 ppid:2 task_flags:0x4208060 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x132a/0x3b00 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common+0x2fc/0x4e0 kernel/sched/completion.c:116
usb_start_wait_urb+0x145/0x4b0 drivers/usb/core/message.c:64
usb_internal_control_msg drivers/usb/core/message.c:103 [inline]
usb_control_msg+0x326/0x4a0 drivers/usb/core/message.c:154
_usbctrl_vendorreq_sync+0xcb/0x1f0 drivers/net/wireless/realtek/rtlwifi/usb.c:42
_usb_read_sync+0x122/0x190 drivers/net/wireless/realtek/rtlwifi/usb.c:75
rtl_read_dword drivers/net/wireless/realtek/rtlwifi/wifi.h:2899 [inline]
read_efuse_byte+0x67b/0x980 drivers/net/wireless/realtek/rtlwifi/efuse.c:191
read_efuse+0x9cb/0xd70 drivers/net/wireless/realtek/rtlwifi/efuse.c:291
efuse_read_all_map drivers/net/wireless/realtek/rtlwifi/efuse.c:657 [inline]
rtl_efuse_shadow_map_update+0x1f8/0x2c0 drivers/net/wireless/realtek/rtlwifi/efuse.c:503
rtl_get_hwinfo+0xdf/0x880 drivers/net/wireless/realtek/rtlwifi/efuse.c:1233
_rtl92cu_read_adapter_info drivers/net/wireless/realtek/rtlwifi/rtl8192cu/hw.c:334 [inline]
rtl92cu_read_eeprom_info+0x2b4/0x2730 drivers/net/wireless/realtek/rtlwifi/rtl8192cu/hw.c:411
rtl_usb_probe+0x9a1/0x2630 drivers/net/wireless/realtek/rtlwifi/usb.c:1006
usb_probe_interface+0x300/0x9c0 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x23e/0xa90 drivers/base/dd.c:658
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:800
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:958
bus_for_each_drv+0x156/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1030
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3666
usb_set_configuration+0x1187/0x1e20 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:250
usb_probe_device+0xec/0x3e0 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x23e/0xa90 drivers/base/dd.c:658
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:800
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:958
bus_for_each_drv+0x156/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1030
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3666
usb_new_device+0xd07/0x1a20 drivers/usb/core/hub.c:2663
hub_port_connect drivers/usb/core/hub.c:5535 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5675 [inline]
port_event drivers/usb/core/hub.c:5835 [inline]
hub_event+0x2f85/0x5030 drivers/usb/core/hub.c:5917
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task udevd:5239 blocked for more than 144 seconds.
Not tainted 6.15.0-rc1-syzkaller-00082-gf41f7b3d9daf #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D
stack:24536 pid:5239 tgid:5239 ppid:2839 task_flags:0x400140 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x132a/0x3b00 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 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+0x6c7/0xb90 kernel/locking/mutex.c:746
device_lock include/linux/device.h:922 [inline]
uevent_show+0x187/0x3b0 drivers/base/core.c:2730
dev_attr_show+0x53/0xe0 drivers/base/core.c:2424
sysfs_kf_seq_show+0x213/0x3e0 fs/sysfs/file.c:65
seq_read_iter+0x506/0x12b0 fs/seq_file.c:230
kernfs_fop_read_iter+0x422/0x5a0 fs/kernfs/file.c:279
new_sync_read fs/read_write.c:489 [inline]
vfs_read+0x8c8/0xc70 fs/read_write.c:570
ksys_read+0x12a/0x240 fs/read_write.c:713
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb03b9efb6a
RSP: 002b:00007fff9bd3c798 EFLAGS: 00000246
ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00005639a131a0e0 RCX: 00007fb03b9efb6a
RDX: 0000000000001000 RSI: 00005639a1313250 RDI: 0000000000000008
RBP: 00005639a131a0e0 R08: 0000000000000008 R09: 0000000000000008
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000003fff R14: 00007fff9bd3cc78 R15: 000000000000000a
INFO: task udevd:5239 is blocked on a mutex likely owned by task kworker/0:2:2900.
task:kworker/0:2 state:R
running task
stack:21816 pid:2900 tgid:2900 ppid:2 task_flags:0x4208060 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x132a/0x3b00 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common+0x2fc/0x4e0 kernel/sched/completion.c:116
usb_start_wait_urb+0x145/0x4b0 drivers/usb/core/message.c:64
usb_internal_control_msg drivers/usb/core/message.c:103 [inline]
usb_control_msg+0x326/0x4a0 drivers/usb/core/message.c:154
_usbctrl_vendorreq_sync+0xcb/0x1f0 drivers/net/wireless/realtek/rtlwifi/usb.c:42
_usb_read_sync+0x122/0x190 drivers/net/wireless/realtek/rtlwifi/usb.c:75
rtl_read_dword drivers/net/wireless/realtek/rtlwifi/wifi.h:2899 [inline]
read_efuse_byte+0x67b/0x980 drivers/net/wireless/realtek/rtlwifi/efuse.c:191
read_efuse+0x4aa/0xd70 drivers/net/wireless/realtek/rtlwifi/efuse.c:320
efuse_read_all_map drivers/net/wireless/realtek/rtlwifi/efuse.c:657 [inline]
rtl_efuse_shadow_map_update+0x1f8/0x2c0 drivers/net/wireless/realtek/rtlwifi/efuse.c:503
rtl_get_hwinfo+0xdf/0x880 drivers/net/wireless/realtek/rtlwifi/efuse.c:1233
_rtl92cu_read_adapter_info drivers/net/wireless/realtek/rtlwifi/rtl8192cu/hw.c:334 [inline]
rtl92cu_read_eeprom_info+0x2b4/0x2730 drivers/net/wireless/realtek/rtlwifi/rtl8192cu/hw.c:411
rtl_usb_probe+0x9a1/0x2630 drivers/net/wireless/realtek/rtlwifi/usb.c:1006
usb_probe_interface+0x300/0x9c0 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x23e/0xa90 drivers/base/dd.c:658
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:800
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:958
bus_for_each_drv+0x156/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1030
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3666
usb_set_configuration+0x1187/0x1e20 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:250
usb_probe_device+0xec/0x3e0 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x23e/0xa90 drivers/base/dd.c:658
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:800
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:958
bus_for_each_drv+0x156/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1030
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3666
usb_new_device+0xd07/0x1a20 drivers/usb/core/hub.c:2663
hub_port_connect drivers/usb/core/hub.c:5535 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5675 [inline]
port_event drivers/usb/core/hub.c:5835 [inline]
hub_event+0x2f85/0x5030 drivers/usb/core/hub.c:5917
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 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/1:0/23:
#0: ffff8881066b3948 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc9000018fd18 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffff88810b3d0198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#2: ffff88810b3d0198 (&dev->mutex){....}-{4:4}, at: hub_event+0x1be/0x5030 drivers/usb/core/hub.c:5863
#3: ffff888124bdc198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#3: ffff888124bdc198 (&dev->mutex){....}-{4:4}, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1005
#4: ffff888118137160 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#4: ffff888118137160 (&dev->mutex){....}-{4:4}, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1005
#5: ffff88810b3d3508 (&port_dev->status_lock){+.+.}-{4:4}, at: usb_lock_port drivers/usb/core/hub.c:3220 [inline]
#5: ffff88810b3d3508 (&port_dev->status_lock){+.+.}-{4:4}, at: usb_reset_device+0x559/0xa90 drivers/usb/core/hub.c:6361
#6: ffff8881102ac568 (hcd->address0_mutex){+.+.}-{4:4}, at: usb_reset_and_verify_device+0x335/0x1120 drivers/usb/core/hub.c:6167
#7: ffffffff89bee090 (ehci_cf_port_reset_rwsem){.+.+}-{4:4}, at: hub_port_reset+0x1a1/0x1e00 drivers/usb/core/hub.c:3035
1 lock held by khungtaskd/30:
#0:
ffffffff890c1a00
(rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
(rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
(rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6764
2 locks held by getty/2899:
#0: ffff888100ec50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc900000432f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
5 locks held by kworker/0:2/2900:
3 locks held by kworker/1:4/5216:
#0: ffff8881066b3948 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffffff890c1a00 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#1: ffffffff890c1a00 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#1: ffffffff890c1a00 (rcu_read_lock){....}-{1:3}, at: __update_idle_core+0x58/0x5b0 kernel/sched/fair.c:7595
#2: ffffffff890af280 (
console_lock){+.+.}-{0:0}, at: lock_timer_base+0x127/0x1d0 kernel/time/timer.c:1046
4 locks held by udevd/5217:
#0: ffff888125132668 (
&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xe1/0x12b0 fs/seq_file.c:182
#1: ffff8881196f4488 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
#2: ffff88810faa9878 (kn->active#5){++++}-{0:0}, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
#3:
ffff88810afe8198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
ffff88810afe8198 (&dev->mutex){....}-{4:4}, at: uevent_show+0x187/0x3b0 drivers/base/core.c:2730
4 locks held by udevd/5239:
#0: ffff8881062e9790 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xe1/0x12b0 fs/seq_file.c:182
#1: ffff888139694c88 (&of->mutex
#2
){+.+.}-{4:4}, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
#2:
ffff88810faa9878 (kn->active#5){++++}-{0:0}, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
#3: ffff88810afe8198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#3: ffff88810afe8198 (&dev->mutex){....}-{4:4}, at: uevent_show+0x187/0x3b0 drivers/base/core.c:2730
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.15.0-rc1-syzkaller-00082-gf41f7b3d9daf #0 PREEMPT(voluntary)
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+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/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+0x11c4/0x15d0 kernel/hung_task.c:437
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
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: 18499 Comm: kworker/1:1 Not tainted 6.15.0-rc1-syzkaller-00082-gf41f7b3d9daf #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events legacy_dvb_usb_read_remote_control
RIP: 0010:convert_num_spec.isra.0+0x10/0x90 lib/vsprintf.c:2733
Code: e9 04 ff ff ff 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 55 41 89 f5 41 54 41 89 d4 55 bd 04 00 00 00 <41> 83 e4 01 53 44 29 ed 89 fb c1 e5 03 e8 0e 54 5d fa 89 ee bf 20
RSP: 0018:ffffc9000b9072e0 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffffffff8748ff04 RCX: ffffffff87201b60
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 000000000000001e
RBP: 0000000000000004 R08: 0000000000000005 R09: 000000000000002f
R10: 0000000000000020 R11: 0000000000917330 R12: 0000000000000000
R13: 0000000000000004 R14: 0000000000000004 R15: ffffc9000b907488
FS: 0000000000000000(0000) GS:ffff8882692d3000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005639a1a8e818 CR3: 00000001179ca000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
vsnprintf+0xdc5/0x1160 lib/vsprintf.c:2813
snprintf+0xc7/0x100 lib/vsprintf.c:2946
print_caller kernel/printk/printk.c:1390 [inline]
info_print_prefix+0x134/0x350 kernel/printk/printk.c:1409
record_print_text+0x140/0x400 kernel/printk/printk.c:1456
printk_get_next_message+0x2d1/0x6d0 kernel/printk/printk.c:3024
console_emit_next_record kernel/printk/printk.c:3092 [inline]
console_flush_all+0x6ea/0xc60 kernel/printk/printk.c:3226
__console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
console_unlock+0xd8/0x210 kernel/printk/printk.c:3325
vprintk_emit+0x418/0x6d0 kernel/printk/printk.c:2450
_printk+0xc7/0x100 kernel/printk/printk.c:2475
m920x_read drivers/media/usb/dvb-usb/m920x.c:40 [inline]
m920x_rc_query+0x496/0x770 drivers/media/usb/dvb-usb/m920x.c:193
legacy_dvb_usb_read_remote_control+0x109/0x4f0 drivers/media/usb/dvb-usb/dvb-usb-remote.c:123
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245