INFO: task syz.5.2192:7351 blocked for more than 123 seconds.
Not tainted 6.12.38-syzkaller-g886d2f37b799 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.2192 state:D stack:0 pid:7351 tgid:7351 ppid:2500 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
__mutex_lock_common kernel/locking/mutex.c:707 [inline]
__mutex_lock+0x81e/0x1b50 kernel/locking/mutex.c:803
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1134
mutex_lock+0x102/0x1c0 kernel/locking/mutex.c:285
rcu_barrier+0x4d/0x530 kernel/rcu/tree.c:4589
netdev_run_todo+0x10e/0xcb0 net/core/dev.c:10868
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:3517
__fput+0x1fb/0xa00 fs/file_table.c:429
____fput+0x20/0x30 fs/file_table.c:457
task_work_run+0x1e0/0x250 kernel/task_work.c:240
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x9bc/0x2630 kernel/exit.c:953
do_group_exit+0x22a/0x300 kernel/exit.c:1095
get_signal+0x139d/0x14f0 kernel/signal.c:2933
arch_do_signal_or_restart+0x96/0x720 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+0x58/0xb0 kernel/entry/common.c:218
do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f5bfa9c14a5
RSP: 002b:00007f5bfb760f80 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007f5bfabb5fa0 RCX: 00007f5bfa9c14a5
RDX: 00007f5bfb760fc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f5bfaa11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007f5bfabb6038 R14: 00007f5bfabb5fa0 R15: 00007ffd1b6cb018
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.38-syzkaller-g886d2f37b799 #0 f36c02f5443cd552c209ccf9d090ed65beec93f8
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2bf/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+0xd8f/0xed0 kernel/hung_task.c:423
kthread+0x2ca/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: 30 Comm: ksoftirqd/1 Not tainted 6.12.38-syzkaller-g886d2f37b799 #0 f36c02f5443cd552c209ccf9d090ed65beec93f8
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:213
Code: 52 00 5b 5d c3 cc cc cc cc cc cc cc cc cc cc cc cc cc b8 b2 df d4 b9 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 e5 <48> 8b 45 08 65 48 8b 0c 25 80 e9 04 00 65 8b 15 ec 1d 7f 7e 81 e2
RSP: 0018:ffffc900001f7110 EFLAGS: 00000246
RAX: ffffffff84e1f045 RBX: ffffc900001f7510 RCX: ffff888103679300
RDX: 0000000000000100 RSI: ffff888108301000 RDI: ffff888108301000
RBP: ffffc900001f7110 R08: ffffc900001f7378 R09: 0000000000000017
R10: ffffc900001f7510 R11: fffff5200003eea6 R12: ffff888108301000
R13: dffffc0000000000 R14: ffff888108301000 R15: ffffc900001f7378
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9d87bf84c0 CR3: 00000000072a8000 CR4: 00000000003526b0
DR0: 0000000000000001 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
__find_rr_leaf+0x4c7/0x790 net/ipv6/route.c:833
find_rr_leaf net/ipv6/route.c:893 [inline]
rt6_select net/ipv6/route.c:934 [inline]
fib6_table_lookup+0x302/0x9b0 net/ipv6/route.c:2230
ip6_pol_route+0x167/0x12c0 net/ipv6/route.c:2266
ip6_pol_route_input+0x5a/0x80 net/ipv6/route.c:2323
pol_lookup_func include/net/ip6_fib.h:626 [inline]
fib6_rule_lookup+0x4cc/0x6b0 net/ipv6/fib6_rules.c:117
ip6_route_input_lookup net/ipv6/route.c:2335 [inline]
ip6_route_input+0x59f/0x8d0 net/ipv6/route.c:2631
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+0xed/0x220 net/ipv6/ip6_input.c:309
__netif_receive_skb_one_core net/core/dev.c:5757 [inline]
__netif_receive_skb net/core/dev.c:5870 [inline]
process_backlog+0x44b/0xae0 net/core/dev.c:6206
__napi_poll+0xd0/0x610 net/core/dev.c:6857
napi_poll net/core/dev.c:6926 [inline]
net_rx_action+0x584/0xce0 net/core/dev.c:7048
handle_softirqs+0x1ab/0x630 kernel/softirq.c:621
run_ksoftirqd+0x20/0x30 kernel/softirq.c:999
smpboot_thread_fn+0x493/0x8c0 kernel/smpboot.c:164
kthread+0x2ca/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: 112990 callbacks suppressed
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:6e:c6:4b:4e:9b:57, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:3a:e7:fe:3a:a4:ce, 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 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:0c, vlan:0)
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 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:aa:aa:aa:aa:aa:0c, vlan:0)