INFO: task syz.2.2325:6003 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.2325 state:D stack:0 pid:6003 tgid:6002 ppid:5825 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:6053 [inline]
__schedule+0x1496/0x20b0 kernel/sched/core.c:7866
__schedule_loop kernel/sched/core.c:7943 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7958
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+0x368/0x650 kernel/sched/completion.c:127
wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
rcu_barrier+0x45a/0x580 kernel/rcu/tree.c:4657
netdev_run_todo+0x118/0xce0 net/core/dev.c:10912
rtnl_unlock+0x12/0x20 net/core/rtnetlink.c:152
tun_detach drivers/net/tun.c:704 [inline]
tun_chr_close+0xc5/0x150 drivers/net/tun.c:3520
__fput+0x20b/0xa30 fs/file_table.c:447
____fput+0x20/0x30 fs/file_table.c:475
task_work_run+0x1e8/0x260 kernel/task_work.c:246
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0xa46/0x2850 kernel/exit.c:955
do_group_exit+0x21f/0x2f0 kernel/exit.c:1098
get_signal+0x134c/0x1490 kernel/signal.c:2933
arch_do_signal_or_restart+0xbc/0x700 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: 0033:0x7fb190d9de59
RSP: 002b:00007fb191bba028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 0000000000000034 RBX: 00007fb191025fa0 RCX: 00007fb190d9de59
RDX: 0000000000004040 RSI: 0000200000000b40 RDI: 0000000000000003
RBP: 00007fb190e33e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb191026038 R14: 00007fb191025fa0 R15: 00007ffe06e0f968
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 5e823d74124d9c17bee2b333d3eb538db5552cb2
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+0xe45/0xf90 kernel/hung_task.c:423
kthread+0x2c7/0x360 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: 440 Comm: kworker/u8:25 Not tainted syzkaller #0 5e823d74124d9c17bee2b333d3eb538db5552cb2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: netns cleanup_net
RIP: 0010:kasan_check_range+0x4/0x2b0 mm/kasan/generic.c:188
Code: 52 e2 c5 03 cc 0f 0b b8 ea ff ff ff e9 45 e2 c5 03 cc cc cc cc cc b8 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 01 48 85 f6 0f 84 c0 01 00 00 55 48 89 e5 41 57 41 56 41 55 41
RSP: 0018:ffffc9000c3c7310 EFLAGS: 00000282
RAX: ffff88814c75801c RBX: ffff88814c75801c RCX: ffffffff81e6593b
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88814c75801c
RBP: ffffc9000c3c7318 R08: ffff888107ddb66f R09: 1ffff11020fbb6cd
R10: dffffc0000000000 R11: ffffed1020fbb6ce R12: 0000000000000001
R13: ffff888107ddb6ac R14: 0000000000000284 R15: ffff88814c758000
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbadb464087 CR3: 0000000111022000 CR4: 00000000003526b0
Call Trace:
instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:400 [inline]
__refcount_sub_and_test include/linux/refcount.h:389 [inline]
refcount_sub_and_test include/linux/refcount.h:427 [inline]
dec_stack_record_count mm/page_owner.c:245 [inline]
__reset_page_owner+0x34b/0x450 mm/page_owner.c:328
reset_page_owner include/linux/page_owner.h:28 [inline]
free_pages_prepare mm/page_alloc.c:1390 [inline]
free_unref_page+0xbb8/0xf70 mm/page_alloc.c:2876
__free_pages+0x6b/0x3b0 mm/page_alloc.c:5402
__free_slab+0xb2/0x110 mm/slub.c:2758
free_slab+0x18/0xe0 mm/slub.c:2781
discard_slab mm/slub.c:2787 [inline]
__put_partials+0x115/0x150 mm/slub.c:3256
put_cpu_partial+0x91/0xc0 mm/slub.c:3331
__slab_free+0x1cf/0x2a0 mm/slub.c:4584
do_slab_free mm/slub.c:4666 [inline]
___cache_free+0xc9/0xe0 mm/slub.c:4781
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0xb5/0x130 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x14f/0x180 mm/kasan/quarantine.c:286
__kasan_kmalloc+0x28/0xb0 mm/kasan/common.c:387
kasan_kmalloc include/linux/kasan.h:261 [inline]
__do_kmalloc_node mm/slub.c:4395 [inline]
__kmalloc_node_track_caller_noprof+0x24e/0x4f0 mm/slub.c:4414
kmalloc_reserve+0x144/0x4f0 net/core/skbuff.c:618
__alloc_skb+0x13f/0x360 net/core/skbuff.c:687
alloc_skb include/linux/skbuff.h:1363 [inline]
nlmsg_new include/net/netlink.h:1015 [inline]
rtmsg_ifinfo_build_skb+0x7a/0x270 net/core/rtnetlink.c:4106
rtmsg_ifinfo_event net/core/rtnetlink.c:4148 [inline]
rtmsg_ifinfo+0x91/0x1a0 net/core/rtnetlink.c:4157
dev_close_many+0x27b/0x4f0 net/core/dev.c:1666
unregister_netdevice_many_notify+0x4bd/0x1be0 net/core/dev.c:11507
unregister_netdevice_many+0x1d/0x30 net/core/dev.c:11595
cleanup_net+0x640/0xc90 net/core/net_namespace.c:637
process_one_work kernel/workqueue.c:3273 [inline]
process_scheduled_works+0x7f7/0x1060 kernel/workqueue.c:3354
worker_thread+0xc99/0x13f0 kernel/workqueue.c:3435
kthread+0x2c7/0x360 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: 76169 callbacks suppressed
bridge0: received packet on veth0_to_bridge 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:1b, vlan:0)
bridge0: received packet on veth0_to_bridge 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:1b, vlan:0)
bridge0: received packet on veth0_to_bridge 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:1b, vlan:0)
bridge0: received packet on veth0_to_bridge 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:1b, vlan:0)
bridge0: received packet on veth0_to_bridge 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:1b, vlan:0)