INFO: task syz-executor:858 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:0 pid:858 tgid:858 ppid:1 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6109 [inline]
__schedule+0x16e0/0x2380 kernel/sched/core.c:7956
__schedule_loop kernel/sched/core.c:8031 [inline]
schedule+0xc1/0x170 kernel/sched/core.c:8046
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8103
__mutex_lock_common kernel/locking/mutex.c:707 [inline]
__mutex_lock+0x95d/0x1d10 kernel/locking/mutex.c:807
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1137
mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
rtnl_lock net/core/rtnetlink.c:79 [inline]
rtnetlink_rcv_msg+0x79e/0xa40 net/core/rtnetlink.c:6684
netlink_rcv_skb+0x24a/0x4e0 net/netlink/af_netlink.c:2554
rtnetlink_rcv+0x20/0x30 net/core/rtnetlink.c:6705
netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
netlink_unicast+0x8bf/0xa70 net/netlink/af_netlink.c:1340
netlink_sendmsg+0x7d1/0xad0 net/netlink/af_netlink.c:1895
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
__sys_sendto+0x663/0x6e0 net/socket.c:2198
__do_sys_sendto net/socket.c:2205 [inline]
__se_sys_sendto net/socket.c:2201 [inline]
__x64_sys_sendto+0xe9/0x100 net/socket.c:2201
x64_sys_call+0x2c2c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:45
do_syscall_x64 arch/x86/entry/common.c:47 [inline]
do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fd642d5ac97
RSP: 002b:00007ffe85c7f010 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000555574346500 RCX: 00007fd642d5ac97
RDX: 0000000000000028 RSI: 00007fd643b54670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffe85c7f074 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
R13: 0000000000000000 R14: 00007fd643b54670 R15: 0000000000000000
INFO: task syz-executor:860 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:0 pid:860 tgid:860 ppid:1 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6109 [inline]
__schedule+0x16e0/0x2380 kernel/sched/core.c:7956
__schedule_loop kernel/sched/core.c:8031 [inline]
schedule+0xc1/0x170 kernel/sched/core.c:8046
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8103
__mutex_lock_common kernel/locking/mutex.c:707 [inline]
__mutex_lock+0x95d/0x1d10 kernel/locking/mutex.c:807
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1137
mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
rtnl_lock net/core/rtnetlink.c:79 [inline]
rtnetlink_rcv_msg+0x79e/0xa40 net/core/rtnetlink.c:6684
netlink_rcv_skb+0x24a/0x4e0 net/netlink/af_netlink.c:2554
rtnetlink_rcv+0x20/0x30 net/core/rtnetlink.c:6705
netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
netlink_unicast+0x8bf/0xa70 net/netlink/af_netlink.c:1340
netlink_sendmsg+0x7d1/0xad0 net/netlink/af_netlink.c:1895
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
__sys_sendto+0x663/0x6e0 net/socket.c:2198
__do_sys_sendto net/socket.c:2205 [inline]
__se_sys_sendto net/socket.c:2201 [inline]
__x64_sys_sendto+0xe9/0x100 net/socket.c:2201
x64_sys_call+0x2c2c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:45
do_syscall_x64 arch/x86/entry/common.c:47 [inline]
do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fc4a475ac97
RSP: 002b:00007ffe12960190 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000055556423c500 RCX: 00007fc4a475ac97
RDX: 0000000000000028 RSI: 00007fc4a5554670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffe129601f4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
R13: 0000000000000000 R14: 00007fc4a5554670 R15: 0000000000000000
INFO: task kworker/u8:6:861 blocked for more than 124 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:6 state:D stack:0 pid:861 tgid:861 ppid:2 flags:0x00004000
Workqueue: events_unbound linkwatch_event
Call Trace:
context_switch kernel/sched/core.c:6109 [inline]
__schedule+0x16e0/0x2380 kernel/sched/core.c:7956
__schedule_loop kernel/sched/core.c:8031 [inline]
schedule+0xc1/0x170 kernel/sched/core.c:8046
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8103
__mutex_lock_common kernel/locking/mutex.c:707 [inline]
__mutex_lock+0x95d/0x1d10 kernel/locking/mutex.c:807
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1137
mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
rtnl_lock+0x19/0x20 net/core/rtnetlink.c:79
linkwatch_event+0x12/0x60 net/core/link_watch.c:285
process_one_work kernel/workqueue.c:3273 [inline]
process_scheduled_works+0x7f7/0x1060 kernel/workqueue.c:3354
worker_thread+0xc99/0x13f0 kernel/workqueue.c:3435
kthread+0x2c7/0x360 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
INFO: task syz-executor:880 blocked for more than 128 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:0 pid:880 tgid:880 ppid:1 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:6109 [inline]
__schedule+0x16e0/0x2380 kernel/sched/core.c:7956
__schedule_loop kernel/sched/core.c:8031 [inline]
schedule+0xc1/0x170 kernel/sched/core.c:8046
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8103
__mutex_lock_common kernel/locking/mutex.c:707 [inline]
__mutex_lock+0x95d/0x1d10 kernel/locking/mutex.c:807
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1137
mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
rtnl_lock net/core/rtnetlink.c:79 [inline]
rtnetlink_rcv_msg+0x79e/0xa40 net/core/rtnetlink.c:6684
netlink_rcv_skb+0x24a/0x4e0 net/netlink/af_netlink.c:2554
rtnetlink_rcv+0x20/0x30 net/core/rtnetlink.c:6705
netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
netlink_unicast+0x8bf/0xa70 net/netlink/af_netlink.c:1340
netlink_sendmsg+0x7d1/0xad0 net/netlink/af_netlink.c:1895
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
__sys_sendto+0x663/0x6e0 net/socket.c:2198
__do_sys_sendto net/socket.c:2205 [inline]
__se_sys_sendto net/socket.c:2201 [inline]
__x64_sys_sendto+0xe9/0x100 net/socket.c:2201
x64_sys_call+0x2c2c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:45
do_syscall_x64 arch/x86/entry/common.c:47 [inline]
do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f70e3f5ac97
RSP: 002b:00007fff8e0ca950 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00005555648a4500 RCX: 00007f70e3f5ac97
RDX: 000000000000002c RSI: 00007f70e4d54670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007fff8e0ca9b4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f70e4d54670 R15: 0000000000000000
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 696230b0126414627535663eb488b8b4d474df7d
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
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:114
nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:63
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
cpumask_backtrace+0x1f/0x30 lib/nmi_backtrace.c:127
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
watchdog+0xe45/0xf90 kernel/hung_task.c:423
kthread+0x2c7/0x360 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 53 Comm: kworker/u8:3 Not tainted syzkaller #0 696230b0126414627535663eb488b8b4d474df7d
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Workqueue: netns cleanup_net
RIP: 0010:find_match+0x185/0x10d0 net/ipv6/route.c:790
Code: 86 fc eb 05 e8 4c b2 86 fc 48 8b 7d d0 44 89 e6 8b 55 b0 44 89 f1 e8 aa de fd ff 41 89 c7 bf ff ff ff ff 89 c6 e8 6b b6 86 fc <41> 83 ff ff 74 1a bf fd ff ff ff 44 89 fe e8 58 b6 86 fc 41 83 ff
RSP: 0018:ffffc90000006c50 EFLAGS: 00000246
RAX: ffffffff8502b3d5 RBX: 0000000000000000 RCX: 0000000000000100
RDX: ffff8881016d2780 RSI: 00000000fffffffd RDI: 00000000ffffffff
RBP: ffffc90000006d10 R08: ffffc90000006f80 R09: ffffc90000006f90
R10: ffffc900000070f0 R11: fffff52000000e22 R12: 0000000000000001
R13: 1ffff11021e63718 R14: 0000000000000003 R15: 00000000fffffffd
FS: 0000000000000000(0000) GS:ffff8881f6c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559a135bd1f0 CR3: 000000010dbb2000 CR4: 00000000003526b0
Call Trace:
__find_rr_leaf+0x249/0x840 net/ipv6/route.c:872
find_rr_leaf net/ipv6/route.c:893 [inline]
rt6_select net/ipv6/route.c:937 [inline]
fib6_table_lookup+0x2d0/0x980 net/ipv6/route.c:2245
ip6_pol_route+0x17a/0x1370 net/ipv6/route.c:2281
ip6_pol_route_input+0x5a/0x80 net/ipv6/route.c:2338
pol_lookup_func include/net/ip6_fib.h:650 [inline]
fib6_rule_lookup+0x4f1/0x6d0 net/ipv6/fib6_rules.c:117
ip6_route_input_lookup net/ipv6/route.c:2350 [inline]
ip6_route_input+0x60d/0x8d0 net/ipv6/route.c:2646
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:5801 [inline]
__netif_receive_skb net/core/dev.c:5914 [inline]
netif_receive_skb_internal net/core/dev.c:6000 [inline]
netif_receive_skb+0x146/0x7b0 net/core/dev.c:6059
br_netif_receive_skb net/bridge/br_input.c:30 [inline]
NF_HOOK include/linux/netfilter.h:317 [inline]
br_pass_frame_up+0x126/0x1b0 net/bridge/br_input.c:70
br_handle_frame_finish+0x1178/0x1620 net/bridge/br_input.c:-1
nf_hook_bridge_pre net/bridge/br_input.c:301 [inline]
br_handle_frame+0x5a5/0xba0 net/bridge/br_input.c:424
__netif_receive_skb_core+0xfc4/0x3a70 net/core/dev.c:5695
__netif_receive_skb_one_core net/core/dev.c:5799 [inline]
__netif_receive_skb net/core/dev.c:5914 [inline]
process_backlog+0x40b/0xaf0 net/core/dev.c:6250
__napi_poll+0xcd/0x600 net/core/dev.c:6901
napi_poll net/core/dev.c:6970 [inline]
net_rx_action+0x5dc/0xd70 net/core/dev.c:7092
handle_softirqs+0x1b0/0x5b0 kernel/softirq.c:684
__do_softirq+0xf/0x16 kernel/softirq.c:722
do_softirq+0xb8/0x110 kernel/softirq.c:566
__local_bh_enable_ip+0x74/0x80 kernel/softirq.c:493
__raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline]
_raw_spin_unlock_bh+0x54/0x60 kernel/locking/spinlock.c:210
spin_unlock_bh include/linux/spinlock.h:397 [inline]
addrconf_ifdown+0x60d/0x1970 net/ipv6/addrconf.c:3953
addrconf_notify+0x17a/0xeb0 net/ipv6/addrconf.c:-1
notifier_call_chain+0x106/0x2b0 kernel/notifier.c:93
raw_notifier_call_chain+0x31/0x40 kernel/notifier.c:461
call_netdevice_notifiers_info net/core/dev.c:2074 [inline]
call_netdevice_notifiers_extack net/core/dev.c:2112 [inline]
call_netdevice_notifiers net/core/dev.c:2126 [inline]
unregister_netdevice_many_notify+0xde1/0x1be0 net/core/dev.c:11533
unregister_netdevice_many net/core/dev.c:11595 [inline]
default_device_exit_batch+0x845/0x8d0 net/core/dev.c:12166
ops_exit_list net/core/net_namespace.c:178 [inline]
cleanup_net+0x741/0xc90 net/core/net_namespace.c:642
process_one_work kernel/workqueue.c:3273 [inline]
process_scheduled_works+0x7f7/0x1060 kernel/workqueue.c:3354
worker_thread+0xc99/0x13f0 kernel/workqueue.c:3435
kthread+0x2c7/0x360 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: 96741 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:92:17:a3:60:28:66, 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:92:17:a3:60:28:66, 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:92:17:a3:60:28:66, 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:92:17:a3:60:28:66, 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:92:17:a3:60:28:66, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)