INFO: task syz.4.1376:4591 blocked for more than 122 seconds.
Not tainted 6.12.30-syzkaller-ge2bf362ee23b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1376 state:D stack:0 pid:4591 tgid:4591 ppid:3660 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5929 [inline]
__schedule+0x145b/0x1f10 kernel/sched/core.c:7755
__schedule_loop kernel/sched/core.c:7836 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7851
request_wait_answer fs/fuse/dev.c:476 [inline]
__fuse_request_send fs/fuse/dev.c:491 [inline]
__fuse_simple_request+0xdb1/0x1980 fs/fuse/dev.c:586
fuse_simple_request fs/fuse/fuse_i.h:1248 [inline]
fuse_flush+0x909/0x1d50 fs/fuse/file.c:582
filp_flush fs/open.c:1550 [inline]
filp_close+0xc0/0x160 fs/open.c:1563
__range_close fs/file.c:712 [inline]
__close_range+0x50e/0x6c0 fs/file.c:769
__do_sys_close_range fs/open.c:1616 [inline]
__se_sys_close_range fs/open.c:1613 [inline]
__x64_sys_close_range+0x7e/0x90 fs/open.c:1613
x64_sys_call+0x1686/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:437
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: 0033:0x7f607bf8e929
RSP: 002b:00007ffc54151db8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007f607c1b7ba0 RCX: 00007f607bf8e929
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f607c1b7ba0 R08: 00000000000000a0 R09: 00000009541520af
R10: 00000000003ffd3c R11: 0000000000000246 R12: 0000000000030557
R13: 00007f607c1b6160 R14: ffffffffffffffff R15: 00007ffc54151ed0
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.30-syzkaller-ge2bf362ee23b #0 e1c904518e9113895a28c59b25a6002cdacb68bf
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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:229 [inline]
watchdog+0xd8f/0xed0 kernel/hung_task.c:385
kthread+0x2c7/0x370 kernel/kthread.c:389
ret_from_fork+0x64/0xa0 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:
net_ratelimit: 113185 callbacks suppressed
bridge0: received packet on O3ãc¤± with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on O3ãc¤± 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 veth0_to_bridge with own address as source address (addr:56:d0:ba:72:21:da, vlan:0)
bridge0: received packet on O3ãc¤± with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on O3ãc¤± 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 veth0_to_bridge with own address as source address (addr:56:d0:ba:72:21:da, vlan:0)
bridge0: received packet on O3ãc¤± with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on O3ãc¤± with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 4605 Comm: syz-executor Not tainted 6.12.30-syzkaller-ge2bf362ee23b #0 e1c904518e9113895a28c59b25a6002cdacb68bf
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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 e7 ac 97 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 b9 ac 97 00 48 ba 00 00 00 00 00 fc ff df 49 8b
RSP: 0018:ffffc90000006f28 EFLAGS: 00000246
RAX: 1ffff1102415fbe4 RBX: ffffc90000006fa8 RCX: 0000000000006f00
RDX: dffffc0000000000 RSI: ffffffff8158405e RDI: ffffc90000006fa8
RBP: ffffc90000006f98 R08: ffffc90000007070 R09: ffffc90000007068
R10: 0000000000000018 R11: ffffffff817403e0 R12: 0000000000000000
R13: ffff888120afdf20 R14: ffffc90000006fd0 R15: ffffc9000d6af968
FS: 000055555b6ad500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005597f6a06b98 CR3: 0000000165054000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x4a/0x60 mm/kasan/generic.c:579
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2413 [inline]
slab_free mm/slub.c:4662 [inline]
kmem_cache_free+0x1c1/0x4c0 mm/slub.c:4767
kfree_skbmem net/core/skbuff.c:-1 [inline]
__kfree_skb+0x18f/0x210 net/core/skbuff.c:1215
sk_skb_reason_drop+0xd8/0x310 net/core/skbuff.c:1252
kfree_skb_reason include/linux/skbuff.h:1271 [inline]
kfree_skb include/linux/skbuff.h:1280 [inline]
ip6_mc_input+0x4f3/0x670 net/ipv6/ip6_input.c:587
dst_input include/net/dst.h:469 [inline]
ip6_rcv_finish+0x341/0x3c0 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:6202
__napi_poll+0xd3/0x610 net/core/dev.c:6853
napi_poll net/core/dev.c:6922 [inline]
net_rx_action+0x584/0xce0 net/core/dev.c:7044
handle_softirqs+0x1ae/0x630 kernel/softirq.c:603
__do_softirq+0xf/0x16 kernel/softirq.c:641
do_softirq+0xa6/0x100 kernel/softirq.c:485
__local_bh_enable_ip+0x74/0x80 kernel/softirq.c:412
__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+0x608/0x1940 net/ipv6/addrconf.c:3956
addrconf_notify+0x17a/0xea0 net/ipv6/addrconf.c:-1
notifier_call_chain+0x10e/0x2c0 kernel/notifier.c:93
raw_notifier_call_chain+0x31/0x40 kernel/notifier.c:461
call_netdevice_notifiers_info net/core/dev.c:2067 [inline]
call_netdevice_notifiers_extack net/core/dev.c:2105 [inline]
call_netdevice_notifiers net/core/dev.c:2119 [inline]
unregister_netdevice_many_notify+0xe32/0x1bd0 net/core/dev.c:11485
unregister_netdevice_many+0x1d/0x30 net/core/dev.c:11547
setup_net+0x5cc/0x990 net/core/net_namespace.c:383
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:3351
__do_sys_unshare kernel/fork.c:3422 [inline]
__se_sys_unshare kernel/fork.c:3420 [inline]
__x64_sys_unshare+0x3c/0x50 kernel/fork.c:3420
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: 0033:0x7f53dfb90127
Code: 73 01 c3 48 c7 c1 a8 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd11251aa8 EFLAGS: 00000206 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f53dfdb5f40 RCX: 00007f53dfb90127
RDX: 0000000000000005 RSI: 00007ffd11251970 RDI: 0000000040000000
RBP: 00007f53dfdb6738 R08: 00007f53e08e7d60 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000008
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000
net_ratelimit: 119264 callbacks suppressed
bridge0: received packet on O3ãc¤± with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on O3ãc¤± 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:56:d0:ba:72:21:da, 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 O3ãc¤± with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on O3ãc¤± 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:56:d0:ba:72:21:da, 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 O3ãc¤± with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on O3ãc¤± with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)