INFO: task kworker/u8:25:13260 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:25 state:D stack:0 pid:13260 tgid:13260 ppid:2 flags:0x00004000
Workqueue: ipv6_addrconf addrconf_dad_work
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
rtnl_lock+0x19/0x20 net/core/rtnetlink.c:79
addrconf_dad_work+0xca/0x14e0 net/ipv6/addrconf.c:4234
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0x7d2/0x1020 kernel/workqueue.c:3319
worker_thread+0xc58/0x1250 kernel/workqueue.c:3400
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
INFO: task kworker/u8:38:13273 blocked for more than 124 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:38 state:D stack:0 pid:13273 tgid:13273 ppid:2 flags:0x00004000
Workqueue: events_unbound linkwatch_event
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
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:3238 [inline]
process_scheduled_works+0x7d2/0x1020 kernel/workqueue.c:3319
worker_thread+0xc58/0x1250 kernel/workqueue.c:3400
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
INFO: task syz.2.6210:19666 blocked for more than 124 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.6210 state:D stack:0 pid:19666 tgid:19665 ppid:14349 flags:0x00004004
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
rtnl_lock+0x19/0x20 net/core/rtnetlink.c:79
setup_net+0x503/0x990 net/core/net_namespace.c:378
copy_net_ns+0x513/0xa30 net/core/net_namespace.c:510
create_new_namespaces+0x3b5/0x720 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x126/0x180 kernel/nsproxy.c:228
ksys_unshare+0x4fe/0x880 kernel/fork.c:3352
__do_sys_unshare kernel/fork.c:3423 [inline]
__se_sys_unshare kernel/fork.c:3421 [inline]
__x64_sys_unshare+0x3c/0x50 kernel/fork.c:3421
x64_sys_call+0x2998/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:273
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f02daf8f6c9
RSP: 002b:00007f02dbe0b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f02db1e5fa0 RCX: 00007f02daf8f6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000060000600
RBP: 00007f02db011f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f02db1e6038 R14: 00007f02db1e5fa0 R15: 00007ffc84be3ce8
INFO: task syz-executor:19683 blocked for more than 124 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:19683 tgid:19683 ppid:1 flags:0x00004004
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
rtnl_lock+0x19/0x20 net/core/rtnetlink.c:79
ip_tunnel_init_net+0x2f2/0x860 net/ipv4/ip_tunnel.c:1159
ipgre_init_net+0x28/0x30 net/ipv4/ip_gre.c:1063
ops_init+0x1b2/0x5d0 net/core/net_namespace.c:139
setup_net+0x20e/0x990 net/core/net_namespace.c:356
copy_net_ns+0x513/0xa30 net/core/net_namespace.c:510
create_new_namespaces+0x3b5/0x720 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x126/0x180 kernel/nsproxy.c:228
ksys_unshare+0x4fe/0x880 kernel/fork.c:3352
__do_sys_unshare kernel/fork.c:3423 [inline]
__se_sys_unshare kernel/fork.c:3421 [inline]
__x64_sys_unshare+0x3c/0x50 kernel/fork.c:3421
x64_sys_call+0x2998/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:273
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fad05990ec7
RSP: 002b:00007ffcf1df1af8 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fad05be5f40 RCX: 00007fad05990ec7
RDX: 0000000000000005 RSI: 00007ffcf1df19c0 RDI: 0000000040000000
RBP: 00007fad05be67b8 R08: 00007fad06717d60 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffcf1df1dc8 R15: 0000000000000000
NMI backtrace for cpu 0
CPU: 0 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 33 Comm: rcuop/1 Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:task_stack_page include/linux/sched/task_stack.h:23 [inline]
RIP: 0010:last_frame arch/x86/kernel/unwind_frame.c:82 [inline]
RIP: 0010:is_last_frame arch/x86/kernel/unwind_frame.c:87 [inline]
RIP: 0010:is_last_task_frame arch/x86/kernel/unwind_frame.c:156 [inline]
RIP: 0010:unwind_next_frame+0x10d/0x750 arch/x86/kernel/unwind_frame.c:276
Code: f7 e8 f7 3d 98 00 48 ba 00 00 00 00 00 fc ff df 4c 89 75 98 49 8b 06 48 89 45 a8 4c 8d 68 20 4c 89 e8 48 c1 e8 03 80 3c 10 00 <74> 12 4c 89 ef e8 c9 3d 98 00 48 ba 00 00 00 00 00 fc ff df 49 8b
RSP: 0018:ffffc90000230028 EFLAGS: 00000246
RAX: 1ffff110206cf004 RBX: ffffc900002300a8 RCX: 0000000000230000
RDX: dffffc0000000000 RSI: ffffffff84733703 RDI: ffffc900002300a8
RBP: ffffc90000230098 R08: ffffc90000230170 R09: ffffc90000230168
R10: 0000000000000006 R11: ffffffff817457d0 R12: 0000000000000000
R13: ffff888103678020 R14: ffffc900002300d0 R15: ffffc90000230658
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdab4fe5f40 CR3: 0000000109f72000 CR4: 00000000003526b0
Call Trace:
arch_stack_walk+0x139/0x170 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9d/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:48 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:69
kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565
poison_kmalloc_redzone mm/kasan/common.c:378 [inline]
__kasan_kmalloc+0x96/0xb0 mm/kasan/common.c:395
kasan_kmalloc include/linux/kasan.h:260 [inline]
__kmalloc_cache_noprof+0x24c/0x490 mm/slub.c:4402
kmalloc_noprof include/linux/slab.h:881 [inline]
kzalloc_noprof include/linux/slab.h:1017 [inline]
ref_tracker_alloc+0x153/0x540 lib/ref_tracker.c:203
__netdev_tracker_alloc include/linux/netdevice.h:4109 [inline]
netdev_hold include/linux/netdevice.h:4138 [inline]
dst_init+0xcf/0x420 net/core/dst.c:52
dst_alloc+0x163/0x250 net/core/dst.c:93
rt_dst_alloc net/ipv4/route.c:1642 [inline]
ip_route_input_slow net/ipv4/route.c:2380 [inline]
ip_route_input_rcu+0x184a/0x2520 net/ipv4/route.c:2494
ip_route_input_noref+0xbf/0x130 net/ipv4/route.c:2505
arp_process+0x89d/0x1740 net/ipv4/arp.c:840
NF_HOOK+0x157/0x1b0 include/linux/netfilter.h:317
arp_rcv+0x2f8/0x490 net/ipv4/arp.c:991
__netif_receive_skb_one_core net/core/dev.c:5769 [inline]
__netif_receive_skb net/core/dev.c:5882 [inline]
process_backlog+0x556/0xae0 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: 95554 callbacks suppressed
bridge0: received packet on 30{ X功 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
bridge0: received packet on 30{ X功 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on 30{ X功 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:d6:a0:80:af:54:9a, vlan:0)
bridge0: received packet on 30{ X功 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on 30{ X功 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on 30{ X功 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)