INFO: task kworker/u8:2:44 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:2 state:D stack:0 pid:44 tgid:44 ppid:2 flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
context_switch kernel/sched/core.c:6026 [inline]
__schedule+0x1399/0x1fa0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7961 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7976
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:10900
rtnl_unlock+0x12/0x20 net/core/rtnetlink.c:152
cleanup_net+0x648/0xc90 net/core/net_namespace.c:638
process_one_work kernel/workqueue.c:3261 [inline]
process_scheduled_works+0x7d4/0x1020 kernel/workqueue.c:3342
worker_thread+0xc51/0x1370 kernel/workqueue.c:3423
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 0f3775a9ea948f8f8f06e34e337f4a1c8395b27e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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+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: 17 Comm: ksoftirqd/0 Not tainted syzkaller #0 0f3775a9ea948f8f8f06e34e337f4a1c8395b27e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__in6_dev_get include/net/addrconf.h:342 [inline]
RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:433 [inline]
RIP: 0010:find_match+0xbb/0x10e0 net/ipv6/route.c:781
Code: 74 08 48 89 df e8 65 fe e5 fc 48 89 d8 bb c0 00 00 00 48 03 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 48 89 df e8 3b fe e5 fc 48 8b 1b 48 85 db 0f 84 e5 0b 00 00
RSP: 0018:ffffc90000117058 EFLAGS: 00000246
RAX: 1ffff1102626e418 RBX: ffff8881313720c0 RCX: dffffc0000000000
RDX: ffff888103652600 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000117110 R08: ffffc900001173a0 R09: ffffc900001173b0
R10: ffffc90000117510 R11: fffff52000022ea6 R12: 0000000000000001
R13: 1ffff110216e0918 R14: 0000000000000003 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056248c3861f0 CR3: 000000010c36e000 CR4: 00000000003526b0
Call Trace:
__find_rr_leaf+0x24e/0x840 net/ipv6/route.c:869
find_rr_leaf net/ipv6/route.c:890 [inline]
rt6_select net/ipv6/route.c:934 [inline]
fib6_table_lookup+0x2ee/0x9e0 net/ipv6/route.c:2242
ip6_pol_route+0x17a/0x1370 net/ipv6/route.c:2278
ip6_pol_route_input+0x5a/0x80 net/ipv6/route.c:2335
pol_lookup_func include/net/ip6_fib.h:626 [inline]
fib6_rule_lookup+0x4ee/0x6d0 net/ipv6/fib6_rules.c:117
ip6_route_input_lookup net/ipv6/route.c:2347 [inline]
ip6_route_input+0x62e/0x8f0 net/ipv6/route.c:2643
ip6_rcv_finish_core net/ipv6/ip6_input.c:66 [inline]
ip6_rcv_finish+0x15a/0x3c0 net/ipv6/ip6_input.c:77
NF_HOOK include/linux/netfilter.h:317 [inline]
ipv6_rcv+0xf1/0x240 net/ipv6/ip6_input.c:309
__netif_receive_skb_one_core net/core/dev.c:5789 [inline]
__netif_receive_skb net/core/dev.c:5902 [inline]
process_backlog+0x44b/0xad0 net/core/dev.c:6238
__napi_poll+0xd3/0x610 net/core/dev.c:6889
napi_poll net/core/dev.c:6958 [inline]
net_rx_action+0x5ea/0xd80 net/core/dev.c:7080
handle_softirqs+0x1aa/0x630 kernel/softirq.c:621
run_ksoftirqd+0x20/0x30 kernel/softirq.c:999
smpboot_thread_fn+0x492/0x8b0 kernel/smpboot.c:164
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
net_ratelimit: 116877 callbacks suppressed
bridge0: received packet on ªªªªª( 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 ªªªªª( with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on ªªªªª( with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on ªªªªª( with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on ªªªªª( with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on ªªªªª( 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:06:76:ab:35:1c:2b, vlan:0)
bridge0: received packet on ªªªªª( 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)
net_ratelimit: 132797 callbacks suppressed
bridge0: received packet on ªªªªª( 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:06:76:ab:35:1c:2b, vlan:0)
bridge0: received packet on ªªªªª( 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 ªªªªª( 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:06:76:ab:35:1c:2b, vlan:0)
bridge0: received packet on ªªªªª( with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on ªªªªª( with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on ªªªªª( with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on ªªªªª( with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)