INFO: task syz.1.98:641 blocked for more than 124 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.98 state:D stack:0 pid:641 tgid:641 ppid:289 flags:0x00004006
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_timeout+0xb2/0x3a0 kernel/time/timer.c:2595
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common+0x359/0x630 kernel/sched/completion.c:127
wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
rcu_barrier+0x415/0x530 kernel/rcu/tree.c:4657
netdev_run_todo+0x10e/0xcb0 net/core/dev.c:10880
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:3517
__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
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x9bc/0x2630 kernel/exit.c:953
do_group_exit+0x22a/0x300 kernel/exit.c:1095
get_signal+0x139d/0x14f0 kernel/signal.c:2933
arch_do_signal_or_restart+0x96/0x720 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+0x58/0xb0 kernel/entry/common.c:218
do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f197fbc1885
RSP: 002b:00007f1980ae4f80 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007f197fde5fa0 RCX: 00007f197fbc1885
RDX: 00007f1980ae4fc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f197fc11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007f197fde6038 R14: 00007f197fde5fa0 R15: 00007ffdd13546c8
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 281 Comm: sshd-session Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:stack_trace_consume_entry+0xd7/0x2a0 kernel/stacktrace.c:93
Code: 89 ff 49 89 d4 4c 89 45 c8 4d 89 ce 4c 89 55 d0 e8 9e 13 68 00 4c 8b 55 d0 4d 89 f1 4c 8b 45 c8 4c 89 e2 4c 89 ff 48 8b 75 c0 <4c> 8b 37 45 8d 7a 01 0f b6 04 13 84 c0 0f 85 4a 01 00 00 45 89 38
RSP: 0018:ffffc9000118f590 EFLAGS: 00000246
RAX: 1ffff92000231ed4 RBX: 1ffff92000231ed6 RCX: 000000000118f600
RDX: dffffc0000000000 RSI: ffffffff81d8ba81 RDI: ffffc9000118f6a0
RBP: ffffc9000118f5d8 R08: ffffc9000118f6b0 R09: ffffc9000118f6a8
R10: 0000000000000005 R11: ffffffff817457d0 R12: ffffc9000118f6ac
R13: 1ffff92000231ed5 R14: 0000000000000000 R15: 1ffff92000231ed5
FS: 00007f29c5270300(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f29c4bf84c0 CR3: 00000001082de000 CR4: 00000000003526b0
Call Trace:
arch_stack_walk+0x12a/0x170 arch/x86/kernel/stacktrace.c:27
stack_trace_save+0x9d/0xe0 kernel/stacktrace.c:122
save_stack+0xf8/0x1f0 mm/page_owner.c:174
__reset_page_owner+0x79/0x450 mm/page_owner.c:315
reset_page_owner include/linux/page_owner.h:28 [inline]
free_pages_prepare mm/page_alloc.c:1352 [inline]
free_unref_page+0xb4d/0xee0 mm/page_alloc.c:2842
__free_pages+0x6b/0x3b0 mm/page_alloc.c:5351
__free_slab+0xb6/0x110 mm/slub.c:2734
free_slab+0x18/0xf0 mm/slub.c:2757
discard_slab mm/slub.c:2763 [inline]
__put_partials+0x11b/0x150 mm/slub.c:3232
put_cpu_partial+0x91/0xc0 mm/slub.c:3307
__slab_free+0x1d3/0x2b0 mm/slub.c:4560
do_slab_free mm/slub.c:4642 [inline]
___cache_free+0xc9/0xe0 mm/slub.c:4753
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_slab_alloc+0x28/0x90 mm/kasan/common.c:330
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4178 [inline]
slab_alloc_node mm/slub.c:4227 [inline]
kmem_cache_alloc_noprof+0x1cb/0x430 mm/slub.c:4236
lsm_file_alloc security/security.c:734 [inline]
security_file_alloc+0x49/0x200 security/security.c:2859
init_file+0x9e/0x210 fs/file_table.c:153
alloc_empty_file+0xd9/0x280 fs/file_table.c:213
alloc_file fs/file_table.c:326 [inline]
alloc_file_pseudo+0x12a/0x1c0 fs/file_table.c:355
sock_alloc_file+0xbe/0x2b0 net/socket.c:469
sock_map_fd net/socket.c:494 [inline]
__sys_socket+0x14a/0x1c0 net/socket.c:1728
__do_sys_socket net/socket.c:1733 [inline]
__se_sys_socket net/socket.c:1731 [inline]
__x64_sys_socket+0x7e/0x90 net/socket.c:1731
x64_sys_call+0x2608/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:42
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: 0033:0x7f29c4b22707
Code: 54 24 0c e8 6b ac ff ff 83 f8 ff 74 04 8b 44 24 0c 48 83 c4 18 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 b8 29 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c1 e6 0c 00 f7 d8 64 89 01 48
RSP: 002b:00007ffdebd45bc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 0000000000000026 RCX: 00007f29c4b22707
RDX: 0000000000000000 RSI: 0000000000080002 RDI: 0000000000000001
RBP: 00007f29c4bae560 R08: 00000000000001f4 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000002
R13: 00007ffdebd45cf0 R14: 0000000000000049 R15: 00007ffdebd45cf0
net_ratelimit: 104381 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 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:6a:8d:5f:ab:81:26, 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: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)
net_ratelimit: 120971 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:6a:8d:5f:ab:81:26, 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:6a:8d:5f:ab:81:26, 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: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)