INFO: task syz.3.868:3245 blocked for more than 123 seconds.
Not tainted 6.12.38-syzkaller-g78c6c49396da #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.868 state:D stack:0 pid:3245 tgid:3244 ppid:292 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
synchronize_rcu_expedited+0x6b0/0x7b0 kernel/rcu/tree_exp.h:991
kern_unmount_array+0x63/0x420 fs/namespace.c:5621
ovl_free_fs+0x3fe/0x6d0 fs/overlayfs/params.c:739
ovl_free+0x84/0x270 fs/overlayfs/params.c:634
put_fs_context+0x14b/0x810 fs/fs_context.c:520
do_new_mount+0x31c/0xb40 fs/namespace.c:3530
path_mount+0x688/0x1050 fs/namespace.c:3853
do_mount fs/namespace.c:3866 [inline]
__do_sys_mount fs/namespace.c:4076 [inline]
__se_sys_mount+0x2bd/0x480 fs/namespace.c:4053
__x64_sys_mount+0xc3/0xf0 fs/namespace.c:4053
x64_sys_call+0x2021/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:166
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: 0033:0x7ffb0bd8ebe9
RSP: 002b:00007ffb0cbf6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffb0bfb5fa0 RCX: 00007ffb0bd8ebe9
RDX: 0000200000000580 RSI: 0000200000000000 RDI: 0000000000000000
RBP: 00007ffb0be11e19 R08: 0000200000000b00 R09: 0000000000000000
R10: 0000000001000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffb0bfb6038 R14: 00007ffb0bfb5fa0 R15: 00007ffc85477458
INFO: task syz.1.870:3252 blocked for more than 125 seconds.
Not tainted 6.12.38-syzkaller-g78c6c49396da #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.870 state:D stack:0 pid:3252 tgid:3251 ppid:288 flags:0x00000004
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
exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline]
synchronize_rcu_expedited+0x288/0x7b0 kernel/rcu/tree_exp.h:976
synchronize_rcu+0x77/0x2e0 kernel/rcu/tree.c:4119
kvm_device_release+0x1a3/0x220 virt/kvm/kvm_main.c:4791
__fput+0x1fb/0xa00 fs/file_table.c:429
____fput+0x20/0x30 fs/file_table.c:457
task_work_run+0x1e0/0x250 kernel/task_work.c:240
resume_user_mode_work+0x36/0x50 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+0x64/0xb0 kernel/entry/common.c:218
do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f3a6258ebe9
RSP: 002b:00007f3a60bf7038 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f3a627b5fa0 RCX: 00007f3a6258ebe9
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000003
RBP: 00007f3a62611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3a627b6038 R14: 00007f3a627b5fa0 R15: 00007ffe44fe3958
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.38-syzkaller-g78c6c49396da #0 ce4c5f9462df5e0b5dcad023e2a34ea92bcb2402
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 2913 Comm: kworker/0:17 Not tainted 6.12.38-syzkaller-g78c6c49396da #0 ce4c5f9462df5e0b5dcad023e2a34ea92bcb2402
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: mld mld_query_work
RIP: 0010:kasan_save_stack+0x1d/0x60 mm/kasan/common.c:43
Code: 00 00 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 55 48 89 e5 41 57 41 56 53 48 83 e4 f0 48 81 ec 10 02 00 00 89 f3 41 89 fe <49> 89 e7 ba 00 02 00 00 4c 89 ff 31 f6 e8 71 3e ab 03 4c 89 ff be
RSP: 0018:ffffc90000006d70 EFLAGS: 00000082
RAX: ffff88812f76d800 RBX: 0000000000000000 RCX: 00000000075a02b1
RDX: 0000000000000190 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000006fa0 R08: 0000000000001000 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000dec R12: ffff888106765e00
R13: 0000000000000000 R14: 0000000000000000 R15: ffff888100042000
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c32fee1 CR3: 00000000072a8000 CR4: 00000000003526b0
Call Trace:
__kasan_record_aux_stack+0xb2/0xd0 mm/kasan/generic.c:541
kasan_record_aux_stack_noalloc+0xf/0x20 mm/kasan/generic.c:551
insert_work kernel/workqueue.c:2191 [inline]
__queue_work+0x9c4/0x1120 kernel/workqueue.c:2351
__queue_delayed_work+0x18e/0x240 kernel/workqueue.c:2515
mod_delayed_work_on+0xb0/0x140 kernel/workqueue.c:2596
mod_delayed_work include/linux/workqueue.h:698 [inline]
igmp6_event_query+0x1c6/0x2e0 net/ipv6/mcast.c:1385
icmpv6_rcv+0xec9/0x1790 net/ipv6/icmp.c:995
ip6_protocol_deliver_rcu+0xbbc/0x12d0 net/ipv6/ip6_input.c:436
ip6_input_finish net/ipv6/ip6_input.c:481 [inline]
NF_HOOK include/linux/netfilter.h:317 [inline]
ip6_input+0x1c2/0x380 net/ipv6/ip6_input.c:490
ip6_mc_input+0x35a/0x670 net/ipv6/ip6_input.c:584
dst_input include/net/dst.h:469 [inline]
ip6_rcv_finish+0x344/0x3c0 net/ipv6/ip6_input.c:79
NF_HOOK include/linux/netfilter.h:317 [inline]
ipv6_rcv+0xed/0x220 net/ipv6/ip6_input.c:309
__netif_receive_skb_one_core net/core/dev.c:5757 [inline]
__netif_receive_skb net/core/dev.c:5870 [inline]
netif_receive_skb_internal net/core/dev.c:5956 [inline]
netif_receive_skb+0x147/0x7b0 net/core/dev.c:6015
br_netif_receive_skb net/bridge/br_input.c:30 [inline]
NF_HOOK include/linux/netfilter.h:317 [inline]
br_pass_frame_up+0x126/0x1c0 net/bridge/br_input.c:70
br_handle_frame_finish+0x12d9/0x1720 net/bridge/br_input.c:221
nf_hook_bridge_pre net/bridge/br_input.c:301 [inline]
br_handle_frame+0x5a6/0xba0 net/bridge/br_input.c:424
__netif_receive_skb_core+0xf4b/0x3940 net/core/dev.c:5651
__netif_receive_skb_one_core net/core/dev.c:5755 [inline]
__netif_receive_skb net/core/dev.c:5870 [inline]
process_backlog+0x3e5/0xae0 net/core/dev.c:6206
__napi_poll+0xd0/0x610 net/core/dev.c:6857
napi_poll net/core/dev.c:6926 [inline]
net_rx_action+0x584/0xce0 net/core/dev.c:7048
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
__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]
mld_query_work+0x951/0x2c10 net/ipv6/mcast.c:1529
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
net_ratelimit: 113619 callbacks suppressed
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:e2:1d:21:b5:67:d6, 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 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:aa:aa:aa:aa:aa:0c, 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 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:aa:aa:aa:aa:aa:0c, 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 bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
net_ratelimit: 138711 callbacks suppressed
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 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:aa:aa:aa:aa:aa:0c, 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 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:e2:1d:21:b5:67:d6, 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 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:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)