INFO: task syz.3.1327:4807 blocked for more than 124 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1327 state:D stack:0 pid:4807 tgid:4807 ppid:297 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:6027 [inline]
__schedule+0x14ce/0x2100 kernel/sched/core.c:7894
__schedule_loop kernel/sched/core.c:7975 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7990
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8047
__mutex_lock_common kernel/locking/mutex.c:707 [inline]
__mutex_lock+0x960/0x1bc0 kernel/locking/mutex.c:805
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136
mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
rcu_barrier+0x4d/0x540 kernel/rcu/tree.c:4589
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:6576
kvm_arch_destroy_vm+0x398/0x420 arch/x86/kvm/x86.c:12980
kvm_destroy_vm virt/kvm/kvm_main.c:1355 [inline]
kvm_put_kvm+0xb04/0x12c0 virt/kvm/kvm_main.c:1392
kvm_vcpu_release+0x58/0x80 virt/kvm/kvm_main.c:4183
__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: 0033:0x7f65aa59ce59
RSP: 002b:00007ffe3494b708 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f65aa817da0 RCX: 00007f65aa59ce59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f65aa817da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f65aa817cb0 R11: 0000000000000246 R12: 000000000003eb0c
R13: 00007f65aa81618c R14: 000000000003eab8 R15: 00007f65aa816180
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 471281939cd7bfdfff4c6b6074d5d68627c837ba
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 4837 Comm: syz-executor Not tainted syzkaller #0 471281939cd7bfdfff4c6b6074d5d68627c837ba
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x32/0x70 kernel/kcov.c:217
Code: 48 8b 45 08 65 48 8b 0d bc 29 7d 7e 65 8b 15 bd 29 7d 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 ec 0b 00 00 00 <74> 2c 8b 91 c8 0b 00 00 83 fa 02 75 21 48 8b 91 d0 0b 00 00 48 8b
RSP: 0018:ffffc90000230410 EFLAGS: 00000246
RAX: ffffffff8483903d RBX: ffffc90000230750 RCX: ffff8881180d3900
RDX: 0000000000000100 RSI: ffff8881455d43a8 RDI: ffffc90000230750
RBP: ffffc90000230410 R08: 00000000000002ff R09: 0200000000000000
R10: 00000000000002ff R11: 0200000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffc90000230440 R15: 1ffff92000046084
FS: 00005555832a3500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3fe131fff8 CR3: 000000011a044000 CR4: 00000000003526b0
DR0: 000004000002002c DR1: fffeffffff7fff00 DR2: 0000000080000002
DR3: 0000000000000003 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
flow_hash_from_keys+0x6d/0x140 net/core/flow_dissector.c:1815
fib_multipath_hash_from_keys include/net/ip_fib.h:556 [inline]
rt6_multipath_hash+0xd9b/0x15b0 net/ipv6/route.c:-1
ip6_route_input+0x75a/0x8f0 net/ipv6/route.c:2641
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]
process_backlog+0x44b/0xad0 net/core/dev.c:6250
__napi_poll+0xd0/0x610 net/core/dev.c:6901
napi_poll net/core/dev.c:6970 [inline]
net_rx_action+0x5ea/0xd80 net/core/dev.c:7092
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_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:396 [inline]
addrconf_ifdown+0x614/0x1980 net/ipv6/addrconf.c:3950
addrconf_notify+0x17a/0xea0 net/ipv6/addrconf.c:-1
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]
unregister_netdevice_many_notify+0xe3f/0x1c30 net/core/dev.c:11533
unregister_netdevice_many+0x1d/0x30 net/core/dev.c:11595
setup_net+0x5e5/0x9b0 net/core/net_namespace.c:383
copy_net_ns+0x512/0xa30 net/core/net_namespace.c:510
create_new_namespaces+0x3b5/0x720 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228
ksys_unshare+0x503/0x8d0 kernel/fork.c:3374
__do_sys_unshare kernel/fork.c:3457 [inline]
__se_sys_unshare kernel/fork.c:3455 [inline]
__x64_sys_unshare+0x3c/0x50 kernel/fork.c:3455
x64_sys_call+0x2998/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:273
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: 0033:0x7f669b79e127
Code: 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdfb77ff88 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f669ba15f40 RCX: 00007f669b79e127
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007f669ba167b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffdfb7801c8 R15: 0000000000000000
net_ratelimit: 148926 callbacks suppressed
bridge0: received packet on bridge_slave_0 with own address as source address (addr:00:00:00:00:14:bb, vlan:0)
ICMPv6: NA: 00:00:00:00:14:bb advertised our address fe80::200:ff:fe00:14bb on bridge0!
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:00:00:00:00:14:bb, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
ICMPv6: NA: 00:00:00:00:14:bb advertised our address fe80::200:ff:fe00:14bb on bridge0!
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)
ICMPv6: NA: 00:00:00:00:14:bb advertised our address fe80::200:ff:fe00:14bb on bridge0!
net_ratelimit: 184883 callbacks suppressed
ICMPv6: NA: 00:00:00:00:14:bb advertised our address fe80::200:ff:fe00:14bb on bridge0!
bridge0: received packet on veth0_to_bridge with own address as source address (addr:62:51:37:01:cf:9a, 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)
ICMPv6: NA: 00:00:00:00:14:bb advertised our address fe80::200:ff:fe00:14bb on bridge0!
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:00:00:00:00:14:bb, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:62:51:37:01:cf:9a, vlan:0)
ICMPv6: NA: 00:00:00:00:14:bb advertised our address fe80::200:ff:fe00:14bb on bridge0!
bridge0: received packet on veth0_to_bridge with own address as source address (addr:62:51:37:01:cf:9a, vlan:0)