INFO: task kworker/0:3:643 blocked for more than 128 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:3 state:D stack:0 pid:643 tgid:643 ppid:2 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
context_switch kernel/sched/core.c:5996 [inline]
__schedule+0x134f/0x1ea0 kernel/sched/core.c:7843
__schedule_loop kernel/sched/core.c:7924 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7939
schedule_timeout+0xc7/0x3b0 kernel/time/timer.c:2596
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common+0x369/0x650 kernel/sched/completion.c:127
wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
rcu_barrier+0x415/0x540 kernel/rcu/tree.c:4657
scsi_host_dev_release+0xae/0x2f0 drivers/scsi/hosts.c:344
device_release+0xae/0x1e0 drivers/base/core.c:-1
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1aa/0x2a0 lib/kobject.c:737
put_device+0x23/0x40 drivers/base/core.c:3800
scsi_host_put+0x20/0x30 drivers/scsi/hosts.c:626
release_everything+0x1f8/0x210 drivers/usb/storage/usb.c:971
usb_stor_disconnect+0x1b9/0x1f0 drivers/usb/storage/usb.c:1179
usb_unbind_interface+0x2a7/0xa30 drivers/usb/core/driver.c:462
device_remove drivers/base/dd.c:569 [inline]
__device_release_driver drivers/base/dd.c:1272 [inline]
device_release_driver_internal+0x4c5/0x790 drivers/base/dd.c:1295
device_release_driver+0x1d/0x30 drivers/base/dd.c:1318
bus_remove_device+0x359/0x380 drivers/base/bus.c:576
device_del+0x581/0xd00 drivers/base/core.c:3881
usb_disable_device+0x3af/0x770 drivers/usb/core/message.c:1418
usb_disconnect+0x322/0x930 drivers/usb/core/hub.c:2353
hub_port_connect drivers/usb/core/hub.c:5414 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5714 [inline]
port_event drivers/usb/core/hub.c:5878 [inline]
hub_event+0x1c7a/0x4700 drivers/usb/core/hub.c:5960
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0x7d4/0x1020 kernel/workqueue.c:3319
worker_thread+0xc70/0x10b0 kernel/workqueue.c:3400
kthread+0x2c9/0x370 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 73dd41fee924560e78783f72ff837ca22365b77d
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2ba/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
watchdog+0xdad/0xf00 kernel/hung_task.c:423
kthread+0x2c9/0x370 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
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: 8796 Comm: syz-executor Not tainted syzkaller #0 73dd41fee924560e78783f72ff837ca22365b77d
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:__raw_callee_save___pv_queued_spin_unlock+0x14/0x1d
Code: cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 e5 52 b8 01 00 00 00 31 d2 f0 0f b0 17 <75> 07 5a 5d e9 43 30 00 00 56 0f b6 f0 e8 9a ff ff ff 5e 5a 5d c3
RSP: 0018:ffffc90001c9f468 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000206 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000206 RDI: ffffffff88bf0434
RBP: ffffc90001c9f470 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000393e84 R12: 0000000000000206
R13: ffffffffffffffd8 R14: dffffc0000000000 R15: 0000000000000206
FS: 0000555586b7e500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdbdeb6b4c0 CR3: 0000000135d3a000 CR4: 00000000003526b0
Call Trace:
pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:589 [inline]
queued_spin_unlock arch/x86/include/asm/qspinlock.h:57 [inline]
do_raw_spin_unlock include/linux/spinlock.h:204 [inline]
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:150 [inline]
_raw_spin_unlock_irqrestore+0x4a/0x70 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
avc_reclaim_node security/selinux/avc.c:487 [inline]
avc_alloc_node+0x3f8/0x530 security/selinux/avc.c:506
avc_insert security/selinux/avc.c:619 [inline]
avc_compute_av+0xeb/0x760 security/selinux/avc.c:995
avc_perm_nonode+0xda/0x1d0 security/selinux/avc.c:1118
avc_has_perm_noaudit+0x220/0x360 security/selinux/avc.c:1161
selinux_inode_permission+0x37d/0x5d0 security/selinux/hooks.c:3147
security_inode_permission+0xb0/0x150 security/security.c:2324
inode_permission+0xf3/0x4c0 fs/namei.c:543
may_lookup fs/namei.c:1768 [inline]
link_path_walk+0x221/0xec0 fs/namei.c:2374
path_openat+0x287/0x34f0 fs/namei.c:3937
do_filp_open+0x1f5/0x440 fs/namei.c:3968
do_sys_openat2+0x134/0x1d0 fs/open.c:1440
do_sys_open fs/open.c:1455 [inline]
__do_sys_openat fs/open.c:1471 [inline]
__se_sys_openat fs/open.c:1466 [inline]
__x64_sys_openat+0x13a/0x170 fs/open.c:1466
x64_sys_call+0xe69/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:258
do_syscall_x64 arch/x86/entry/common.c:47 [inline]
do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fdbdeb57817
Code: 48 89 fa 4c 89 df e8 a8 56 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffed4552970 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000555586b7e500 RCX: 00007fdbdeb57817
RDX: 0000000000080001 RSI: 00007fdbdec4d1ce RDI: ffffffffffffff9c
RBP: 00007fdbdec4d1ce R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004
R13: 00007ffed4552a30 R14: 00007ffed4553178 R15: 0000000000000000
net_ratelimit: 105831 callbacks suppressed
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:6e:f0:42:c6:3a:f8, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:6e:f0:42:c6:3a:f8, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:6e:f0:42:c6:3a:f8, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:6e:f0:42:c6:3a:f8, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:6e:f0:42:c6:3a:f8, vlan:0)