INFO: task syz.3.46:474 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.46 state:D stack:0 pid:474 tgid:474 ppid:290 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:6016 [inline]
__schedule+0x1399/0x1fa0 kernel/sched/core.c:7870
__schedule_loop kernel/sched/core.c:7951 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7966
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
netdev_run_todo+0x118/0xce0 net/core/dev.c:10887
rtnl_unlock+0x12/0x20 net/core/rtnetlink.c:152
tun_detach drivers/net/tun.c:704 [inline]
tun_chr_close+0xc5/0x150 drivers/net/tun.c:3520
__fput+0x1fe/0xa00 fs/file_table.c:429
____fput+0x20/0x30 fs/file_table.c:457
task_work_run+0x1e8/0x260 kernel/task_work.c:246
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x9ad/0x2720 kernel/exit.c:954
do_group_exit+0x229/0x2f0 kernel/exit.c:1096
get_signal+0x1398/0x14e0 kernel/signal.c:2933
arch_do_signal_or_restart+0xbc/0x760 arch/x86/kernel/signal.c:337
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+0x57/0xb0 kernel/entry/common.c:218
do_syscall_64+0x63/0xf0 arch/x86/entry/common.c:84
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f75ded9c819
RSP: 002b:00007ffc2f4ab898 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffdfc RBX: 0000000000009888 RCX: 00007f75ded9c819
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f75df015fac
RBP: 0000000000000bea R08: 7fffffffffffffff R09: 0000000000000000
R10: 00007ffc2f4ab9a0 R11: 0000000000000246 R12: 00007ffc2f4ab9c0
R13: 00007f75df015fac R14: 000000000000a472 R15: 00007ffc2f4ab9a0
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 de3e1d1c5728fabb050931035751e453f935abb5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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+0x2c6/0x370 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 381 Comm: kworker/1:3 Not tainted syzkaller #0 de3e1d1c5728fabb050931035751e453f935abb5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: wg-crypt-wg0 wg_packet_tx_worker
RIP: 0010:__asan_memset+0x3e/0x50 mm/kasan/shadow.c:88
Code: 89 ff 48 8b 4d 08 48 89 d6 ba 01 00 00 00 e8 29 e4 ff ff 84 c0 74 10 4c 89 ff 44 89 f6 48 89 da e8 c7 77 c1 03 eb 02 31 c0 5b <41> 5e 41 5f 5d c3 cc cc cc cc cc 0f 1f 80 00 00 00 00 b8 c5 41 ee
RSP: 0018:ffffc90000230760 EFLAGS: 00000246
RAX: ffffc900002308d0 RBX: 1ffff92000046114 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc900002308f0
RBP: ffffc90000230770 R08: ffffc900002308ef R09: 0000000000000000
R10: ffffc900002308d0 R11: fffff5200004611e R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc900002308d0
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555564b7a888 CR3: 00000000074a8000 CR4: 00000000003526b0
Call Trace:
ip6t_do_table+0xd8/0x14d0 net/ipv6/netfilter/ip6_tables.c:261
ip6table_mangle_hook+0x2ab/0x730 net/ipv6/netfilter/ip6table_mangle.c:73
nf_hook_entry_hookfn include/linux/netfilter.h:155 [inline]
nf_hook_slow+0xd5/0x240 net/netfilter/core.c:626
nf_hook include/linux/netfilter.h:272 [inline]
NF_HOOK include/linux/netfilter.h:315 [inline]
ipv6_rcv+0x1d4/0x240 net/ipv6/ip6_input.c:309
__netif_receive_skb_one_core net/core/dev.c:5776 [inline]
__netif_receive_skb net/core/dev.c:5889 [inline]
process_backlog+0x44b/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+0x1ad/0x630 kernel/softirq.c:621
__do_softirq+0xf/0x16 kernel/softirq.c:659
do_softirq+0xb8/0x110 kernel/softirq.c:503
__local_bh_enable_ip+0x74/0x80 kernel/softirq.c:430
__raw_read_unlock_bh include/linux/rwlock_api_smp.h:257 [inline]
_raw_read_unlock_bh+0x2d/0x40 kernel/locking/spinlock.c:284
wg_socket_send_skb_to_peer+0x176/0x1e0 drivers/net/wireguard/socket.c:184
wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline]
wg_packet_tx_worker+0x1d2/0x4e0 drivers/net/wireguard/send.c:276
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0x7d1/0x1020 kernel/workqueue.c:3319
worker_thread+0xc70/0x10b0 kernel/workqueue.c:3400
kthread+0x2c6/0x370 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
net_ratelimit: 119526 callbacks suppressed
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:42:df:24:d1:e1:a8, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:42:df:24:d1:e1:a8, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)