INFO: task syz.5.1428:4667 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.1428 state:D stack:0 pid:4667 tgid:4664 ppid:4618 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5996 [inline]
__schedule+0x134f/0x1ea0 kernel/sched/core.c:7843
__schedule_loop kernel/sched/core.c:7924 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7939
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:12961
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
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x9e3/0x2650 kernel/exit.c:953
do_group_exit+0x229/0x2f0 kernel/exit.c:1095
get_signal+0x1398/0x14e0 kernel/signal.c:2933
arch_do_signal_or_restart+0xbc/0x760 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+0x57/0xb0 kernel/entry/common.c:218
do_syscall_64+0x63/0xf0 arch/x86/entry/common.c:84
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f5200b9aeb9
RSP: 002b:00007f52019b5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffff2 RBX: 00007f5200e16180 RCX: 00007f5200b9aeb9
RDX: 0000000000000000 RSI: 000000000000ae41 RDI: 0000000000000011
RBP: 00007f5200c08c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5200e16218 R14: 00007f5200e16180 R15: 00007ffe6fe29ff8
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 e538f3f6a543b135812147031d083fd1f2699041
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
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: 281 Comm: sshd-session Not tainted syzkaller #0 e538f3f6a543b135812147031d083fd1f2699041
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
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 1c 4e 7d 7e 65 8b 15 1d 4e 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:ffffc90000230950 EFLAGS: 00000246
RAX: ffffffff847e8005 RBX: 1ffff9200004614c RCX: ffff8881082a2600
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffffc90000230ca8
RBP: ffffc90000230950 R08: ffff88811ea73c8f R09: 0000000000000000
R10: ffff88811ea73c80 R11: ffffed1023d4e792 R12: ffff8881f6f50f90
R13: dffffc0000000000 R14: ffffc90000230ca8 R15: 0000000000000039
FS: 00007fdbd05b1300(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fefe7145000 CR3: 0000000101af8000 CR4: 00000000003526b0
Call Trace:
__netif_receive_skb_core+0xc5/0x3ab0 net/core/dev.c:5547
__netif_receive_skb_one_core net/core/dev.c:5761 [inline]
__netif_receive_skb net/core/dev.c:5876 [inline]
process_backlog+0x3e5/0xad0 net/core/dev.c:6212
__napi_poll+0xd3/0x610 net/core/dev.c:6863
napi_poll net/core/dev.c:6932 [inline]
net_rx_action+0x5ea/0xd80 net/core/dev.c:7054
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]
__release_sock+0xa5/0x400 net/core/sock.c:3106
release_sock+0x64/0x1f0 net/core/sock.c:3680
tcp_sendmsg+0x49/0xd0 net/ipv4/tcp.c:1362
inet_sendmsg+0xb7/0x120 net/ipv4/af_inet.c:858
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
sock_write_iter+0x40c/0x530 net/socket.c:1166
new_sync_write fs/read_write.c:591 [inline]
vfs_write+0x761/0xf90 fs/read_write.c:684
ksys_write+0x145/0x260 fs/read_write.c:737
__do_sys_write fs/read_write.c:749 [inline]
__se_sys_write fs/read_write.c:746 [inline]
__x64_sys_write+0x7f/0x90 fs/read_write.c:746
x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
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: 0033:0x7fdbd06a5407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffc74f8e8a0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fdbd05b1300 RCX: 00007fdbd06a5407
RDX: 0000000000000034 RSI: 00005558c558d130 RDI: 0000000000000004
RBP: 00005558c5590c60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001
R13: 00007ffc74f8e9f0 R14: 0000000000000000 R15: 0000000000000004
net_ratelimit: 77895 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:67:5f, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:67:5f, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:00:00:00:00:67:5f, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:67:5f, 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:00:00:00:00:67:5f, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:00:00:00:00:67:5f, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:00:00:00:00:67:5f, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:00:00:00:00:67:5f, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:00:00:00:00:67:5f, vlan:0)