INFO: task syz.0.7945:23983 blocked for more than 124 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.7945 state:D stack:0 pid:23983 tgid:23983 ppid:16275 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_timeout+0xb2/0x3a0 kernel/time/timer.c:2595
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common+0x359/0x630 kernel/sched/completion.c:127
wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
rcu_barrier+0x415/0x530 kernel/rcu/tree.c:4657
netdev_run_todo+0x10e/0xcb0 net/core/dev.c:10880
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: 0033:0x7f9c3f5c1f85
RSP: 002b:00007f9c4040bf80 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007f9c3f7e5fa0 RCX: 00007f9c3f5c1f85
RDX: 00007f9c4040bfc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f9c3f611f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007f9c3f7e6038 R14: 00007f9c3f7e5fa0 R15: 00007ffcd28e8168
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 20 Comm: rcuop/0 Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__sanitizer_cov_trace_switch+0x6e/0x130 kernel/kcov.c:350
Code: 07 0f 85 d5 00 00 00 b9 07 00 00 00 48 85 c0 75 13 e9 c6 00 00 00 b9 01 00 00 00 48 85 c0 0f 84 b8 00 00 00 55 48 89 e5 41 57 <41> 56 41 54 53 48 8b 55 08 65 4c 8b 04 25 00 eb 04 00 45 31 c9 eb
RSP: 0018:ffffc90000007120 EFLAGS: 00000202
RAX: 0000000000000004 RBX: ffffc900000075b4 RCX: 0000000000000005
RDX: 0000000000000100 RSI: ffffffff87b2af90 RDI: 0000000000000001
RBP: ffffc90000007128 R08: ffff888103662600 R09: ffffc900000075a8
R10: 0000000000000003 R11: 0000000000000100 R12: 0000000000000001
R13: 0000000013c122ef R14: 0000000085269abe R15: 00000000c5d68905
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbab17f84c0 CR3: 0000000169d2e000 CR4: 00000000003526b0
Call Trace:
jhash2+0x1c9/0x350 include/linux/jhash.h:135
__xfrm6_pref_hash net/xfrm/xfrm_hash.h:72 [inline]
__xfrm6_dpref_spref_hash net/xfrm/xfrm_hash.h:81 [inline]
__addr_hash net/xfrm/xfrm_hash.h:189 [inline]
policy_hash_direct net/xfrm/xfrm_policy.c:566 [inline]
xfrm_policy_lookup_bytype+0x444/0x1200 net/xfrm/xfrm_policy.c:2178
xfrm_policy_lookup net/xfrm/xfrm_policy.c:2236 [inline]
__xfrm_policy_check+0xb2c/0x32e0 net/xfrm/xfrm_policy.c:3742
__xfrm_policy_check2+0x367/0x720 include/net/xfrm.h:1243
xfrm_policy_check include/net/xfrm.h:1248 [inline]
xfrm6_policy_check include/net/xfrm.h:1258 [inline]
icmpv6_rcv+0x10e/0x1790 net/ipv6/icmp.c:903
ip6_protocol_deliver_rcu+0xbbc/0x12d0 net/ipv6/ip6_input.c:436
ip6_input_finish net/ipv6/ip6_input.c:481 [inline]
NF_HOOK include/linux/netfilter.h:317 [inline]
ip6_input+0x1c2/0x380 net/ipv6/ip6_input.c:490
ip6_mc_input+0x35a/0x670 net/ipv6/ip6_input.c:584
dst_input include/net/dst.h:469 [inline]
ip6_rcv_finish+0x360/0x3e0 net/ipv6/ip6_input.c:79
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:5769 [inline]
__netif_receive_skb net/core/dev.c:5882 [inline]
process_backlog+0x44b/0xae0 net/core/dev.c:6218
__napi_poll+0xd3/0x610 net/core/dev.c:6869
napi_poll net/core/dev.c:6938 [inline]
net_rx_action+0x584/0xce0 net/core/dev.c:7060
handle_softirqs+0x1ab/0x630 kernel/softirq.c:621
__do_softirq+0xf/0x16 kernel/softirq.c:659
do_softirq+0xa6/0x100 kernel/softirq.c:503
__local_bh_enable_ip+0x74/0x80 kernel/softirq.c:430
local_bh_enable include/linux/bottom_half.h:33 [inline]
rcu_do_batch+0x5c6/0xd20 kernel/rcu/tree.c:2594
nocb_cb_wait kernel/rcu/tree_nocb.h:923 [inline]
rcu_nocb_cb_kthread+0x4dc/0xac0 kernel/rcu/tree_nocb.h:957
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: 117969 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 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: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)
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)