syzbot

INFO: task syz.2.679:9803 blocked for more than 143 seconds.
      Not tainted 6.10.0-syzkaller-12710-g3a7e02c040b1 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.679       state:D stack:25328 pid:9803  tgid:9803  ppid:9321   flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 raw_release+0x1b8/0x8a0 net/can/raw.c:415
 __sock_release net/socket.c:659 [inline]
 sock_close+0xbc/0x240 net/socket.c:1421
 __fput+0x24a/0x8a0 fs/file_table.c:422
 task_work_run+0x24f/0x310 kernel/task_work.c:222
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x168/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2d8ad77299
RSP: 002b:00007f2d8b02fb98 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f2d8af07a80 RCX: 00007f2d8ad77299
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f2d8af07a80 R08: 0000000000000006 R09: 00007f2d8b02fe7f
R10: 00000000003ff2a8 R11: 0000000000000246 R12: 000000000005e0ac
R13: 00007f2d8b02fc90 R14: 00007f2d8b02fcb0 R15: ffffffffffffffff
 </TASK>

Showing all locks held in the system:
2 locks held by kworker/1:0/25:
1 lock held by khungtaskd/30:
 #0: ffffffff8e937660 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
 #0: ffffffff8e937660 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #0: ffffffff8e937660 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6620
4 locks held by kworker/u8:4/62:
 #0: ffff8880166e5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
 #0: ffff8880166e5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
 #1: ffffc900015d7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
 #1: ffffc900015d7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
 #2: ffffffff8fc71bd0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:594
 #3: ffffffff8fc7e748 (rtnl_mutex){+.+.}-{3:3}, at: ip_mc_drop_socket+0x81/0x280 net/ipv4/igmp.c:2702
3 locks held by kworker/1:2/945:
5 locks held by kworker/u8:8/2498:
 #0: 
ffff8880b923ea18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:568
 #1: ffffc900096dfd00 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
 #1: ffffc900096dfd00 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
 #2: 
ffffffff8e937660
 (rcu_read_lock){....}-{1:2}, at: lock_timer_base+0x112/0x240 kernel/time/timer.c:1051
 #3: ffffffff951d98d8
 (&obj_hash[i].lock){-.-.}-{2:2}, at: jump_label_lock kernel/jump_label.c:27 [inline]
 (&obj_hash[i].lock){-.-.}-{2:2}, at: static_key_enable_cpuslocked+0xd7/0x260 kernel/jump_label.c:207
 #4: ffffffff8e7e6c88 (text_mutex){+.+.}-{3:3}, at: arch_jump_label_transform_apply+0x17/0x30 arch/x86/kernel/jump_label.c:145
1 lock held by dhcpcd/4896:
 #0: ffffffff8fc7e748
 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x2ce/0x1bc0 net/ipv4/devinet.c:1101
2 locks held by getty/4984:
 #0: 
ffff88802b02c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000312b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2211
2 locks held by kworker/1:4/5277:
2 locks held by kworker/1:5/5279:
3 locks held by kworker/1:6/5282:
1 lock held by syz-executor/9334:
 #0: ffffffff8fc7e748
 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3e/0x1b0 drivers/net/tun.c:3510
1 lock held by syz-executor/9435:
 #0: 
ffffffff8fc7e748
 (
rtnl_mutex
){+.+.}-{3:3}
, at: tun_detach drivers/net/tun.c:698 [inline]
, at: tun_chr_close+0x3e/0x1b0 drivers/net/tun.c:3510
1 lock held by syz-executor/9572:
 #0: ffffffff8fc7e748 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
 #0: ffffffff8fc7e748 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3e/0x1b0 drivers/net/tun.c:3510
2 locks held by syz.2.679/9803:
 #0: ffff88805bd3b208 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:799 [inline]
 #0: ffff88805bd3b208 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release net/socket.c:658 [inline]
 #0: ffff88805bd3b208 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: sock_close+0x90/0x240 net/socket.c:1421
 #1: ffffffff8fc7e748 (rtnl_mutex){+.+.}-{3:3}, at: raw_release+0x1b8/0x8a0 net/can/raw.c:415
1 lock held by syz-executor/9809:
 #0: ffffffff8fc7e748 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8fc7e748 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6644
3 locks held by kworker/u8:2/9821:
 #0: 
ffff88802aa28948
 ((wq_completion)ipv6_addrconf
){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3206 [inline]
, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
 #1: 
ffffc90003287d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
ffffc90003287d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
 #2: ffffffff8fc7e748 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4734
2 locks held by syz-executor/9837:
 #0: ffffffff8fc71bd0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: ffffffff8fc7e748 (rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3872
2 locks held by syz-executor/9839:
 #0: ffffffff8fc71bd0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: ffffffff8fc7e748 (rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3872
2 locks held by syz-executor/9841:
 #0: ffffffff8fc71bd0
 (
pernet_ops_rwsem
){++++}-{3:3}
, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: 
ffffffff8fc7e748
 (
rtnl_mutex
){+.+.}-{3:3}
, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3872
2 locks held by syz-executor/9843:
 #0: 
ffffffff8fc71bd0
 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: ffffffff8fc7e748 (rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3872
2 locks held by syz-executor/9850:
 #0: ffffffff8fc71bd0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: ffffffff8fc7e748 (rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3872
2 locks held by syz-executor/9858:
 #0: ffffffff8fc71bd0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: ffffffff8fc7e748 (rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3872
2 locks held by syz-executor/9863:
 #0: ffffffff8fc71bd0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: ffffffff8fc7e748 (rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3872
2 locks held by syz-executor/9864:
 #0: ffffffff8fc71bd0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: ffffffff8fc7e748
 (rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3872
2 locks held by syz-executor/9866:
 #0: ffffffff8fc71bd0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: ffffffff8fc7e748 (rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3872
7 locks held by syz-executor/9870:
 #0: ffff8880301ce420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2876 [inline]
 #0: ffff8880301ce420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x227/0xc90 fs/read_write.c:586
 #1: 
ffff888065b86088
 (
&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
 #2: ffff888022d87878 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
 #3: ffffffff8f51b628 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
 #4: ffff888068acf0e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline]
 #4: ffff888068acf0e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1094 [inline]
 #4: ffff888068acf0e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xce/0x7c0 drivers/base/dd.c:1292
 #5: ffff888068ace250 (&devlink->lock_key#38){+.+.}-{3:3}, at: nsim_drv_remove+0x50/0x160 drivers/net/netdevsim/dev.c:1672
 #6: ffffffff8fc7e748 (rtnl_mutex
){+.+.}-{3:3}
, at: nsim_destroy+0x71/0x5c0 drivers/net/netdevsim/netdev.c:773
2 locks held by syz-executor/9884:
 #0: 
ffffffff8fc71bd0
 (
pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: ffffffff8fc7e748 (rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3872
2 locks held by syz-executor/9890:
 #0: 
ffffffff8fc71bd0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: 
ffffffff8fc7e748 (rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3872
2 locks held by syz-executor/9892:
 #0: 
ffffffff8fc71bd0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: ffffffff8fc7e748 (rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3872
2 locks held by syz-executor/9895:
 #0: 
ffffffff8fc71bd0 (pernet_ops_rwsem){++++}-{3:3}
, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: 
ffffffff8fc7e748
 (
rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3872

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.10.0-syzkaller-12710-g3a7e02c040b1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 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:223 [inline]
 watchdog+0xfee/0x1030 kernel/hung_task.c:379
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
gspca_pac7302 5-1:0.0: URB error -71, resubmitting
gspca_pac7302 5-1:0.0: URB error -71, resubmitting
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5277 Comm: kworker/1:4 Not tainted 6.10.0-syzkaller-12710-g3a7e02c040b1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Workqueue: events kfree_rcu_monitor
RIP: 0010:io_serial_in+0x76/0xb0 drivers/tty/serial/8250/8250_port.c:406
Code: e0 62 55 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 31 9b bc 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:ffffc90000a16cd8 EFLAGS: 00000006
RAX: 1ffffffff2a49705 RBX: ffffffff9524bf60 RCX: 0000000000000000
RDX: 00000000000003f9 RSI: 0000000000000000 RDI: 0000000000000020
RBP: 0000000000000000 R08: ffffffff853e2076 R09: fffff52000142d7c
R10: dffffc0000000000 R11: ffffffff853e2030 R12: dffffc0000000000
R13: ffffffff8f12eac0 R14: 00000000000003f9 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7036a61440 CR3: 000000006af94000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 serial_port_in include/linux/serial_core.h:674 [inline]
 serial8250_console_write+0x2c2/0x1770 drivers/tty/serial/8250/8250_port.c:3357
 console_emit_next_record kernel/printk/printk.c:2983 [inline]
 console_flush_all+0x865/0xfd0 kernel/printk/printk.c:3049
 console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3118
 vprintk_emit+0x5a6/0x770 kernel/printk/printk.c:2348
 _printk+0xd5/0x120 kernel/printk/printk.c:2373
 int_irq+0x1bd/0x250 drivers/media/usb/gspca/gspca.c:104
 __usb_hcd_giveback_urb+0x42c/0x6e0 drivers/usb/core/hcd.c:1650
 dummy_timer+0x830/0x45a0 drivers/usb/gadget/udc/dummy_hcd.c:1987
 __run_hrtimer kernel/time/hrtimer.c:1689 [inline]
 __hrtimer_run_queues+0x59b/0xd50 kernel/time/hrtimer.c:1753
 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1815
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1043
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x2f/0x70 kernel/kcov.c:207
Code: 8b 04 24 65 48 8b 0c 25 40 d7 03 00 65 8b 15 d0 53 70 7e f7 c2 00 01 ff 00 74 11 f7 c2 00 01 00 00 74 35 83 b9 1c 16 00 00 00 <74> 2c 8b 91 f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b
RSP: 0018:ffffc90000a17b60 EFLAGS: 00000246
RAX: ffffffff814125d2 RBX: 0000000080000101 RCX: ffff888029c03c00
RDX: 0000000080000101 RSI: 0000000080000101 RDI: 0000000000000000
RBP: ffffc90000a17c40 R08: ffffffff814125c5 R09: ffffffff814120bf
R10: 0000000000000003 R11: ffff888029c03c00 R12: ffffc90000a189a0
R13: dffffc0000000000 R14: ffffc90000a11000 R15: ffffc90000a189a8
 unwind_next_frame+0x1e82/0x2a00 arch/x86/kernel/unwind_orc.c:672
 arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:4158 [inline]
 __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4170
 kmalloc_noprof include/linux/slab.h:685 [inline]
 kzalloc_noprof include/linux/slab.h:807 [inline]
 cfg80211_inform_single_bss_data+0xaff/0x2030 net/wireless/scan.c:2307
 cfg80211_inform_bss_data+0x3dd/0x5a70 net/wireless/scan.c:3159
 cfg80211_inform_bss_frame_data+0x3bc/0x720 net/wireless/scan.c:3249
 ieee80211_bss_info_update+0x8a7/0xbc0 net/mac80211/scan.c:226
 ieee80211_scan_rx+0x526/0x9c0 net/mac80211/scan.c:340
 __ieee80211_rx_handle_packet net/mac80211/rx.c:5225 [inline]
 ieee80211_rx_list+0x2b02/0x3780 net/mac80211/rx.c:5462
 ieee80211_rx_napi+0x18a/0x3c0 net/mac80211/rx.c:5485
 ieee80211_rx include/net/mac80211.h:5124 [inline]
 ieee80211_handle_queued_frames+0xe7/0x1e0 net/mac80211/main.c:439
 tasklet_action_common+0x321/0x4d0 kernel/softirq.c:785
 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 0e 7c 3b f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 63 a1 a3 f5 65 8b 05 64 97 44 74 85 c0 74 43 48 c7 04 24 0e 36
RSP: 0018:ffffc90003eff860 EFLAGS: 00000206
RAX: 73e6b86ab153f400 RBX: 1ffff920007dff10 RCX: ffffffff81701f3a
RDX: dffffc0000000000 RSI: ffffffff8c0ad5a0 RDI: 0000000000000001
RBP: ffffc90003eff8f0 R08: ffffffff9372686f R09: 1ffffffff26e4d0d
R10: dffffc0000000000 R11: fffffbfff26e4d0e R12: dffffc0000000000
R13: 1ffff920007dff0c R14: ffffc90003eff880 R15: 0000000000000246
 debug_object_active_state+0x239/0x360 lib/debugobjects.c:946
 debug_rcu_head_unqueue kernel/rcu/rcu.h:236 [inline]
 debug_rcu_bhead_unqueue kernel/rcu/tree.c:3321 [inline]
 kvfree_rcu_bulk+0xc5/0x4e0 kernel/rcu/tree.c:3398
 kvfree_rcu_drain_ready kernel/rcu/tree.c:3579 [inline]
 kfree_rcu_monitor+0x8a4/0x1020 kernel/rcu/tree.c:3597
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
gspca_pac7302 5-1:0.0: URB error -71, resubmitting
gspca_pac7302 5-1:0.0: URB error -71, resubmitting
gspca_pac7302 5-1:0.0: URB error -71, resubmitting
gspca_pac7302 5-1:0.0: URB error -71, resubmitting
gspca_pac7302 5-1:0.0: URB error -71, resubmitting
gspca_pac7302 5-1:0.0: URB error -71, resubmitting