INFO: task syz.5.785:2743 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.785 state:D stack:0 pid:2743 tgid:2743 ppid:1598 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:6016 [inline]
__schedule+0x134f/0x1ea0 kernel/sched/core.c:7864
__schedule_loop kernel/sched/core.c:7945 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7960
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
__flush_work+0x712/0xb10 kernel/workqueue.c:4233
__cancel_work_sync kernel/workqueue.c:4354 [inline]
cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4391
uhid_dev_destroy drivers/hid/uhid.c:584 [inline]
uhid_char_release+0xa7/0x600 drivers/hid/uhid.c:662
__fput+0x1fb/0xa00 fs/file_table.c:429
____fput+0x20/0x30 fs/file_table.c:457
task_work_run+0x1e5/0x260 kernel/task_work.c:246
resume_user_mode_work+0x35/0x50 include/linux/resume_user_mode.h:50
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+0x63/0xb0 kernel/entry/common.c:218
do_syscall_64+0x63/0xf0 arch/x86/entry/common.c:84
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fe48a59c799
RSP: 002b:00007ffd1e5d4198 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fe48a817da0 RCX: 00007fe48a59c799
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fe48a817da0 R08: 00007fe48a816038 R09: 0000000000000000
R10: 00000000003ffb84 R11: 0000000000000246 R12: 00000000000211a0
R13: 00007fe48a81609c R14: 000000000002113a R15: 00007ffd1e5d42a0
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 ea8366dfa2e562e213f3551e28da65e141ad079f
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+0x64/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: kworker/1:0 Not tainted syzkaller #0 ea8366dfa2e562e213f3551e28da65e141ad079f
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: events uhid_device_add_worker
RIP: 0010:skb_network_header include/linux/skbuff.h:3035 [inline]
RIP: 0010:ipv6_hdr include/linux/ipv6.h:116 [inline]
RIP: 0010:br_multicast_ipv6_rcv net/bridge/br_multicast.c:3961 [inline]
RIP: 0010:br_multicast_rcv+0xa67/0x83c0 net/bridge/br_multicast.c:4042
Code: fc 48 8b 5c 24 18 4c 8d b3 e0 00 00 00 4c 89 f0 48 c1 e8 03 48 ba 00 00 00 00 00 fc ff df 48 89 84 24 b8 00 00 00 80 3c 10 00 <74> 12 4c 89 f7 e8 8f 7e cc fc 48 ba 00 00 00 00 00 fc ff df 4c 89
RSP: 0018:ffffc90000230100 EFLAGS: 00000246
RAX: 1ffff1102893fe6c RBX: ffff8881449ff280 RCX: ffff88810367df00
RDX: dffffc0000000000 RSI: ffffffff87d5e120 RDI: 00000000ffffffd6
RBP: ffffc90000230750 R08: ffff88810367df00 R09: 0000000000000002
R10: 00000000ffffffd6 R11: 0000000000000100 R12: ffff888107bdcbf8
R13: ffff88810db46000 R14: ffff8881449ff360 R15: 1ffff1102893fe66
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7d57f45000 CR3: 000000010c32a000 CR4: 00000000003526b0
DR0: 00000000000000d6 DR1: 0000000000000002 DR2: 0000000000000001
DR3: 0000000000000004 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
br_handle_frame_finish+0x5c5/0x1760 net/bridge/br_input.c:153
nf_hook_bridge_pre net/bridge/br_input.c:301 [inline]
br_handle_frame+0x5a6/0xba0 net/bridge/br_input.c:424
__netif_receive_skb_core+0xfb1/0x3ab0 net/core/dev.c:5670
__netif_receive_skb_one_core net/core/dev.c:5774 [inline]
__netif_receive_skb net/core/dev.c:5889 [inline]
process_backlog+0x3e5/0xad0 net/core/dev.c:6225
__napi_poll+0xd0/0x610 net/core/dev.c:6876
napi_poll net/core/dev.c:6945 [inline]
net_rx_action+0x5ea/0xd80 net/core/dev.c:7067
handle_softirqs+0x1aa/0x630 kernel/softirq.c:621
__do_softirq kernel/softirq.c:659 [inline]
invoke_softirq kernel/softirq.c:476 [inline]
__irq_exit_rcu+0x47/0xb0 kernel/softirq.c:708
irq_exit_rcu+0xd/0x30 kernel/softirq.c:720
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0x82/0x90 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_flush_all+0x713/0xac0 arch/x86/include/asm/irqflags.h:-1
Code: de 48 81 e6 00 02 00 00 31 ff e8 38 8f 1e 00 48 81 e3 00 02 00 00 75 07 e8 4a 8a 1e 00 eb 06 e8 43 8a 1e 00 fb 48 8b 5c 24 18 <48> 8b 44 24 28 42 80 3c 20 00 74 08 48 89 df e8 89 6e 76 00 48 8b
RSP: 0018:ffffc90000207000 EFLAGS: 00000293
RAX: ffffffff8169151d RBX: ffffffff878f4a38 RCX: ffff88810367df00
RDX: 0000000000000000 RSI: 0000000000000200 RDI: 0000000000000000
RBP: ffffc90000207130 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000040df0 R12: dffffc0000000000
R13: ffffffff878f49e0 R14: ffffffff878f4a38 R15: 0000000000000001
__console_flush_and_unlock kernel/printk/printk.c:3298 [inline]
console_unlock+0xf8/0x2c0 kernel/printk/printk.c:3338
vprintk_emit+0x282/0x650 kernel/printk/printk.c:2462
dev_vprintk_emit+0x359/0x420 drivers/base/core.c:4962
dev_printk_emit+0xef/0x150 drivers/base/core.c:4973
__dev_printk+0x17f/0x1b0 drivers/base/core.c:4985
_dev_warn+0x11f/0x180 drivers/base/core.c:5029
hid_parser_main+0x84b/0xdc0 drivers/hid/hid-core.c:664
hid_open_report+0x876/0x1110 drivers/hid/hid-core.c:1310
hid_parse include/linux/hid.h:1137 [inline]
hid_generic_probe+0x42/0x90 drivers/hid/hid-generic.c:66
__hid_device_probe drivers/hid/hid-core.c:2703 [inline]
hid_device_probe+0x2c4/0x5d0 drivers/hid/hid-core.c:2740
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2d8/0x890 drivers/base/dd.c:657
__driver_probe_device+0x198/0x280 drivers/base/dd.c:799
driver_probe_device+0x54/0x3f0 drivers/base/dd.c:829
__device_attach_driver+0x2f1/0x4b0 drivers/base/dd.c:957
bus_for_each_drv+0x264/0x300 drivers/base/bus.c:459
__device_attach+0x2c9/0x3c0 drivers/base/dd.c:1029
device_initial_probe+0x1e/0x30 drivers/base/dd.c:1078
bus_probe_device+0x18b/0x270 drivers/base/bus.c:534
device_add+0x80c/0xbf0 drivers/base/core.c:3692
hid_add_device+0x39b/0x560 drivers/hid/hid-core.c:2886
uhid_device_add_worker+0x49/0xf0 drivers/hid/uhid.c:73
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+0x64/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
net_ratelimit: 89344 callbacks suppressed
bridge0: received packet on veth1_to_bridge with own address as source address (addr:e2:d1:ab:a3:69:1b, 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 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:aa:aa:aa:aa:aa:0c, 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:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:e2:d1:ab:a3:69:1b, 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 bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
net_ratelimit: 84498 callbacks suppressed
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 bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, 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 bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, 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:e2:d1:ab:a3:69:1b, 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 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:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)