INFO: task syz-executor:2648 blocked for more than 143 seconds.
Not tainted 6.11.0-rc1-syzkaller-00012-gd483f034f032 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D
stack:24240 pid:2648 tgid:2648 ppid:1 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5188 [inline]
__schedule+0xcda/0x2f80 kernel/sched/core.c:6529
__schedule_loop kernel/sched/core.c:6606 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6621
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
rwsem_down_read_slowpath+0x61e/0xb20 kernel/locking/rwsem.c:1086
__down_read_common kernel/locking/rwsem.c:1250 [inline]
__down_read kernel/locking/rwsem.c:1263 [inline]
down_read+0x124/0x330 kernel/locking/rwsem.c:1528
kernfs_dop_revalidate+0xf0/0x5a0 fs/kernfs/dir.c:1159
d_revalidate fs/namei.c:868 [inline]
d_revalidate fs/namei.c:865 [inline]
lookup_fast+0x239/0x540 fs/namei.c:1679
walk_component+0x5b/0x5b0 fs/namei.c:2035
link_path_walk.part.0.constprop.0+0x669/0xd40 fs/namei.c:2404
link_path_walk fs/namei.c:2336 [inline]
path_openat+0x238/0x2d20 fs/namei.c:3882
do_filp_open+0x1dc/0x430 fs/namei.c:3913
do_sys_openat2+0x17a/0x1e0 fs/open.c:1416
do_sys_open fs/open.c:1431 [inline]
__do_sys_openat fs/open.c:1447 [inline]
__se_sys_openat fs/open.c:1442 [inline]
__x64_sys_openat+0x175/0x210 fs/open.c:1442
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff632336cb1
RSP: 002b:00007ffe0e3f4920 EFLAGS: 00000287
ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000858 RCX: 00007ff632336cb1
RDX: 0000000000090800 RSI: 00007ff6323a4de5 RDI: 00000000ffffff9c
RBP: 00007ffe0e3f49bc R08: 000000000004d1c0 R09: 00007ff632ffe080
R10: 0000000000000000 R11: 0000000000000287 R12: 0000000000000000
R13: 000000000018d035 R14: 000000000018d035 R15: 00007ffe0e3f4a10
INFO: task syz.2.3657:18294 blocked for more than 144 seconds.
Not tainted 6.11.0-rc1-syzkaller-00012-gd483f034f032 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.3657 state:D
stack:27872 pid:18294 tgid:18294 ppid:5866 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5188 [inline]
__schedule+0xcda/0x2f80 kernel/sched/core.c:6529
__schedule_loop kernel/sched/core.c:6606 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6621
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
rwsem_down_write_slowpath+0x539/0x12a0 kernel/locking/rwsem.c:1178
__down_write_common kernel/locking/rwsem.c:1306 [inline]
__down_write kernel/locking/rwsem.c:1315 [inline]
down_write+0x1d8/0x200 kernel/locking/rwsem.c:1580
kernfs_remove_by_name_ns+0x87/0x130 fs/kernfs/dir.c:1689
sysfs_remove_file include/linux/sysfs.h:773 [inline]
driver_remove_file drivers/base/driver.c:198 [inline]
driver_remove_file+0x4a/0x60 drivers/base/driver.c:194
remove_bind_files drivers/base/bus.c:600 [inline]
bus_remove_driver+0x224/0x2c0 drivers/base/bus.c:738
driver_unregister+0x76/0xb0 drivers/base/driver.c:274
usb_gadget_unregister_driver+0x49/0x70 drivers/usb/gadget/udc/core.c:1733
raw_release+0x1a9/0x2f0 drivers/usb/gadget/legacy/raw_gadget.c:462
__fput+0x408/0xbb0 fs/file_table.c:422
task_work_run+0x14e/0x250 kernel/task_work.c:222
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0xaa3/0x2b30 kernel/exit.c:882
do_group_exit+0xd3/0x2a0 kernel/exit.c:1031
get_signal+0x25fd/0x2770 kernel/signal.c:2917
arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x147/0x260 kernel/entry/common.c:218
do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f221caa73b9
RSP: 002b:00007ffef32aad78 EFLAGS: 00000246
ORIG_RAX: 00000000000000ca
RAX: fffffffffffffdfc RBX: 000000000018d9f7 RCX: 00007f221caa73b9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f221cc35f8c
RBP: 00007f221cc35f8c R08: 00007f221cc35f80 R09: 00007ffef32ab05f
R10: 00007ffef32aae70 R11: 0000000000000246 R12: 0000000000000bea
R13: 00007ffef32aae70 R14: 00007ffef32aae90 R15: 000000000018ce0d
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0:
ffffffff88cb68a0 (
rcu_read_lock
){....}-{1:2}
, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6620
3 locks held by kworker/1:1/37:
#0:
ffff888100ef1548
((wq_completion)pm
){+.+.}-{0:0}
, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206
#1:
ffffc90000277d80 (
(work_completion)(&hcd->wakeup_work)
){+.+.}-{0:0}
, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207
#2:
ffff888108bfd190
(
&dev->mutex){....}-{3:3}
, at: device_lock include/linux/device.h:1009 [inline]
, at: usb_remote_wakeup+0x21/0xe0 drivers/usb/core/hub.c:3840
2 locks held by getty/2606:
#0: ffff888113ca10a0
(
&tty->ldisc_sem
){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1:
ffffc900000432f0
(&ldata->atomic_read_lock
){+.+.}-{3:3}
, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/2648:
#0:
ffff888100abc148
(&root->kernfs_rwsem
){++++}-{3:3}
, at: kernfs_dop_revalidate+0x39e/0x5a0 fs/kernfs/dir.c:1141
1 lock held by syz-executor/2651:
#0: ffff888100abc148
(
&root->kernfs_rwsem
){++++}-{3:3}
, at: kernfs_dop_revalidate+0x39e/0x5a0 fs/kernfs/dir.c:1141
7 locks held by kworker/0:4/4921:
3 locks held by kworker/1:6/5026:
1 lock held by syz-executor/5866:
#0:
ffff888100abc148
(&root->kernfs_rwsem
){++++}-{3:3}
, at: kernfs_dop_revalidate+0x39e/0x5a0 fs/kernfs/dir.c:1141
1 lock held by syz-executor/6693:
#0:
ffff888100abc148
(
&root->kernfs_rwsem){++++}-{3:3}
, at: kernfs_dop_revalidate+0x39e/0x5a0 fs/kernfs/dir.c:1141
1 lock held by syz-executor/7045:
#0: ffff888100abc148
(&root->kernfs_rwsem
){++++}-{3:3}
, at: kernfs_dop_revalidate+0x39e/0x5a0 fs/kernfs/dir.c:1141
3 locks held by kworker/0:0/14002:
#0:
ffff888100080948
((wq_completion)events
){+.+.}-{0:0}
, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206
#1:
ffffc90007287d80 (
(work_completion)(&gadget->work)
){+.+.}-{0:0}
, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207
#2:
ffff888100abc148
(&root->kernfs_rwsem
){++++}-{3:3}
, at: kernfs_find_and_get_ns+0x71/0xc0 fs/kernfs/dir.c:918
6 locks held by kworker/0:2/14052:
1 lock held by udevd/15143:
5 locks held by kworker/0:5/15434:
#0: ffff8881052fc148
((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206
#1:
ffffc90002b77d80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207
#2: ffff888108fc4190 (&dev->mutex
){....}-{3:3}
, at: device_lock include/linux/device.h:1009 [inline]
, at: hub_event+0x1be/0x4f50 drivers/usb/core/hub.c:5849
#3: ffff8881f623d758
(
&rq->__lock){-.-.}-{2:2}
, at: rcu_try_lock_acquire include/linux/rcupdate.h:331 [inline]
, at: srcu_read_lock_nmisafe include/linux/srcu.h:267 [inline]
, at: console_srcu_read_lock kernel/printk/printk.c:286 [inline]
, at: console_flush_all+0x12d/0xd70 kernel/printk/printk.c:3041
#4: ffff8881f623d758 (&rq->__lock){-.-.}-{2:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
#4: ffff8881f623d758 (&rq->__lock){-.-.}-{2:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#4: ffff8881f623d758 (&rq->__lock){-.-.}-{2:2}, at: class_rcu_constructor include/linux/rcupdate.h:1150 [inline]
#4: ffff8881f623d758 (&rq->__lock){-.-.}-{2:2}, at: __sched_mm_cid_migrate_from_try_steal_cid kernel/sched/core.c:9985 [inline]
#4: ffff8881f623d758 (&rq->__lock){-.-.}-{2:2}, at: sched_mm_cid_migrate_to+0x558/0xdf0 kernel/sched/core.c:10050
2 locks held by kworker/u8:2/18258:
#0:
ffff888100089148
(
(wq_completion)events_unbound
){+.+.}-{0:0}
, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206
#1: ffffc9000a947d80
(
(work_completion)(&sub_info->work)
){+.+.}-{0:0}
, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207
1 lock held by modprobe/18325:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc1-syzkaller-00012-gd483f034f032 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119
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:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
watchdog+0xf4e/0x1280 kernel/hung_task.c:379
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
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: 15434 Comm: kworker/0:5 Not tainted 6.11.0-rc1-syzkaller-00012-gd483f034f032 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Workqueue: events dvb_usb_read_remote_control
RIP: 0010:io_serial_in+0x87/0xb0 drivers/tty/serial/8250/8250_port.c:407
Code: d8 ba fe 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 1a 66 03 5d 40 89 da ec <5b> 0f b6 c0 5d 41 5c c3 cc cc cc cc e8 08 c9 0f ff eb a2 e8 91 c9
RSP: 0018:ffffc90002b777e8 EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: ffffffff82988c40 RDI: ffffffff8dfc8700
RBP: ffffffff8dfc86c0 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000020 R14: fffffbfff1bf9132 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8881f6200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faaf80c2440 CR3: 0000000112498000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
serial_in drivers/tty/serial/8250/8250.h:137 [inline]
serial_lsr_in drivers/tty/serial/8250/8250.h:159 [inline]
wait_for_lsr+0xda/0x180 drivers/tty/serial/8250/8250_port.c:2068
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3315 [inline]
serial8250_console_write+0xca3/0x1090 drivers/tty/serial/8250/8250_port.c:3393
console_emit_next_record kernel/printk/printk.c:2983 [inline]
console_flush_all+0x53c/0xd70 kernel/printk/printk.c:3049
console_unlock+0xae/0x290 kernel/printk/printk.c:3118
vprintk_emit kernel/printk/printk.c:2348 [inline]
vprintk_emit+0x11a/0x5a0 kernel/printk/printk.c:2303
vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
_printk+0xc8/0x100 kernel/printk/printk.c:2373
m920x_read drivers/media/usb/dvb-usb/m920x.c:40 [inline]
m920x_rc_core_query+0x2d7/0x500 drivers/media/usb/dvb-usb/m920x.c:229
dvb_usb_read_remote_control+0xda/0x1c0 drivers/media/usb/dvb-usb/dvb-usb-remote.c:261
process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xf20 kernel/workqueue.c:3390
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244