INFO: task syz.5.1913:6193 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.1913 state:D stack:0 pid:6193 tgid:6193 ppid:5711 flags:0x00004004
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
kvm_mmu_uninit_tdp_mmu+0x1df/0x210 arch/x86/kvm/mmu/tdp_mmu.c:51
kvm_mmu_uninit_vm+0x27/0x60 arch/x86/kvm/mmu/mmu.c:6572
kvm_arch_destroy_vm+0x398/0x420 arch/x86/kvm/x86.c:12971
kvm_destroy_vm virt/kvm/kvm_main.c:1355 [inline]
kvm_put_kvm+0xb04/0x12c0 virt/kvm/kvm_main.c:1392
kvm_vm_release+0x47/0x70 virt/kvm/kvm_main.c:1415
__fput+0x1fb/0xa00 fs/file_table.c:429
____fput+0x20/0x30 fs/file_table.c:457
task_work_run+0x1e5/0x260 kernel/task_work.c:246
resume_user_mode_work+0x35/0x50 include/linux/resume_user_mode.h:50
exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x63/0xb0 kernel/entry/common.c:218
do_syscall_64+0x63/0xf0 arch/x86/entry/common.c:84
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f3569d9cdd9
RSP: 002b:00007fff2f633208 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f356a017da0 RCX: 00007f3569d9cdd9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f356a017da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f356a017cb0 R11: 0000000000000246 R12: 00000000000368d8
R13: 00007f356a01609c R14: 000000000003661b R15: 00007f356a016090
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 4fe7cc6f12681e33e5673a6fddc2b9988498c256
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: 12 Comm: kworker/u8:0 Not tainted syzkaller #0 4fe7cc6f12681e33e5673a6fddc2b9988498c256
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: netns cleanup_net
RIP: 0010:update_stack_state+0x264/0x4b0 arch/x86/include/asm/stacktrace.h:-1
Code: 8b 7d c0 e8 4e 5f 9b 00 e9 0e ff ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 64 ff ff ff 48 89 df e8 01 5f 9b 00 e9 57 ff ff ff <4c> 89 e3 4d 8d 74 24 40 4d 89 f7 49 c1 ef 03 48 b8 00 00 00 00 00
RSP: 0018:ffffc90000006ab8 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffc90000006c08 RCX: ffffc90000007401
RDX: ffffc90000007480 RSI: 1ffff92000000d82 RDI: ffffc90000006c60
RBP: ffffc90000006b78 R08: ffffc90000006cd0 R09: ffffc90000006cc8
R10: 0000000000000003 R11: ffffffff8175e9a0 R12: ffffc90000006c08
R13: 0000000000000002 R14: ffffc90000008000 R15: ffffc90000000000
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbb48c9eff8 CR3: 000000010bb28000 CR4: 00000000003526b0
Call Trace:
unwind_next_frame+0x3c1/0x750 arch/x86/kernel/unwind_frame.c:315
arch_stack_walk+0x138/0x170 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
save_stack+0x125/0x240 mm/page_owner.c:174
__set_page_owner+0x8e/0x600 mm/page_owner.c:338
set_page_owner include/linux/page_owner.h:35 [inline]
post_alloc_hook+0x37d/0x3b0 mm/page_alloc.c:1863
prep_new_page+0x2d/0x190 mm/page_alloc.c:1871
get_page_from_freelist+0x496e/0x4a20 mm/page_alloc.c:3948
__alloc_pages_noprof+0x35f/0x7e0 mm/page_alloc.c:5312
alloc_slab_page+0x6b/0x1e0 mm/slub.c:-1
allocate_slab+0x69/0x420 mm/slub.c:2687
new_slab mm/slub.c:2741 [inline]
___slab_alloc+0x5a2/0x8d0 mm/slub.c:3934
__slab_alloc mm/slub.c:4025 [inline]
__slab_alloc_node mm/slub.c:4078 [inline]
slab_alloc_node mm/slub.c:4239 [inline]
kmem_cache_alloc_noprof+0x290/0x410 mm/slub.c:4260
dst_alloc+0x13c/0x250 net/core/dst.c:90
rt_dst_alloc net/ipv4/route.c:1647 [inline]
ip_route_input_slow net/ipv4/route.c:2385 [inline]
ip_route_input_rcu+0x1a0e/0x2700 net/ipv4/route.c:2499
ip_route_input_noref+0xd4/0x150 net/ipv4/route.c:2510
arp_process+0x908/0x1790 net/ipv4/arp.c:841
NF_HOOK+0x17e/0x1e0 include/linux/netfilter.h:317
arp_rcv+0x2f8/0x490 net/ipv4/arp.c:992
__netif_receive_skb_one_core net/core/dev.c:5789 [inline]
__netif_receive_skb net/core/dev.c:5902 [inline]
process_backlog+0x556/0xad0 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
__do_softirq+0xf/0x16 kernel/softirq.c:659
do_softirq+0xb8/0x110 kernel/softirq.c:503
__local_bh_enable_ip+0x74/0x80 kernel/softirq.c:430
__raw_write_unlock_bh include/linux/rwlock_api_smp.h:281 [inline]
_raw_write_unlock_bh+0x33/0x70 kernel/locking/spinlock.c:366
pneigh_ifdown_and_unlock net/core/neighbour.c:872 [inline]
__neigh_ifdown+0x239/0x470 net/core/neighbour.c:448
neigh_ifdown+0x23/0x30 net/core/neighbour.c:465
arp_ifdown+0x20/0x30 net/ipv4/arp.c:1365
fib_disable_ip net/ipv4/fib_frontend.c:1443 [inline]
fib_netdev_event+0x58c/0x5d0 net/ipv4/fib_frontend.c:1509
notifier_call_chain+0x10e/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]
dev_close_many+0x33b/0x4f0 net/core/dev.c:1667
unregister_netdevice_many_notify+0x4bb/0x1c30 net/core/dev.c:11495
unregister_netdevice_many+0x1d/0x30 net/core/dev.c:11583
cleanup_net+0x643/0xc90 net/core/net_namespace.c:637
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
net_ratelimit: 120523 callbacks suppressed
bridge0: received packet on bridge_slave_0 with own address as source address (addr:00:00:00:00:14:bb, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:14:bb, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:00:00:00:00:14:bb, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:00:00:00:00:14:bb, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:14:bb, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:14:bb, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:14:bb, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:14:bb, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:14:bb, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:00:00:00:00:14:bb, vlan:0)