INFO: task syz.0.2441:8143 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.2441 state:D stack:0 pid:8143 tgid:8104 ppid:8086 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
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+0xbd/0x160 fs/open.c:1563
close_files fs/file.c:427 [inline]
put_files_struct+0x1b5/0x330 fs/file.c:442
exit_files+0x84/0xa0 fs/file.c:459
do_exit+0x985/0x2630 kernel/exit.c:948
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: 0033:0x7f406b98eba9
RSP: 002b:00007f406c7ad0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f406bbd6188 RCX: 00007f406b98eba9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f406bbd6188
RBP: 00007f406bbd6180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f406bbd6218 R14: 00007ffe94625a20 R15: 00007ffe94625b08
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 064bd8e71db8281f775729d9237f740d6717dea5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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+0x2c7/0x370 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: 14334 Comm: syz.3.4388 Not tainted syzkaller #0 064bd8e71db8281f775729d9237f740d6717dea5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:in_irqentry_text kernel/stacktrace.c:382 [inline]
RIP: 0010:filter_irq_stacks+0x69/0xa0 kernel/stacktrace.c:398
Code: 00 49 8b 04 de 48 3d 30 02 a0 85 0f 93 c1 48 3d 90 17 a0 85 0f 92 c2 84 d1 75 27 48 3d f0 ae 8e 85 0f 92 c1 48 3d 16 af 8e 85 <0f> 93 c0 08 c8 74 11 48 ff c3 49 83 c7 08 49 39 dc 75 ae 44 89 e3
RSP: 0018:ffffc900000078c8 EFLAGS: 00000287
RAX: ffffffff81dbe9fe RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000082801 RSI: 0000000000000025 RDI: ffffc90000007970
RBP: ffffc900000078f0 R08: ffffc900000078f0 R09: ffffc900000078e8
R10: 0000000000000024 R11: ffffffff81744550 R12: 0000000000000025
R13: dffffc0000000000 R14: ffffc90000007970 R15: ffffc90000007970
FS: 00007f7d880cf6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c30f108 CR3: 000000015ee20000 CR4: 00000000003526b0
Call Trace:
stack_depot_save_flags+0x38/0x800 lib/stackdepot.c:609
kasan_save_stack mm/kasan/common.c:49 [inline]
kasan_save_track+0x4f/0x80 mm/kasan/common.c:69
kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565
unpoison_slab_object mm/kasan/common.c:320 [inline]
__kasan_slab_alloc+0x73/0x90 mm/kasan/common.c:346
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4169 [inline]
slab_alloc_node mm/slub.c:4218 [inline]
kmem_cache_alloc_node_noprof+0x139/0x3b0 mm/slub.c:4272
kmalloc_reserve+0xcf/0x500 net/core/skbuff.c:596
__alloc_skb+0x144/0x370 net/core/skbuff.c:687
alloc_skb include/linux/skbuff.h:1331 [inline]
wg_packet_send_keepalive+0x66/0x1e0 drivers/net/wireguard/send.c:226
wg_expired_send_persistent_keepalive+0x57/0x80 drivers/net/wireguard/timers.c:141
call_timer_fn+0x4c/0x300 kernel/time/timer.c:1797
expire_timers kernel/time/timer.c:1848 [inline]
__run_timers kernel/time/timer.c:2422 [inline]
__run_timer_base+0x6b3/0x9a0 kernel/time/timer.c:2434
run_timer_base kernel/time/timer.c:2443 [inline]
run_timer_softirq+0x35/0x70 kernel/time/timer.c:2453
handle_softirqs+0x1ab/0x630 kernel/softirq.c:621
__do_softirq kernel/softirq.c:659 [inline]
invoke_softirq kernel/softirq.c:476 [inline]
__irq_exit_rcu+0x48/0xc0 kernel/softirq.c:708
irq_exit_rcu+0xd/0x30 kernel/softirq.c:720
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0x82/0x90 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2076 [inline]
RIP: 0010:vprintk_emit+0x530/0x640 kernel/printk/printk.c:2462
Code: 81 e6 00 02 00 00 31 ff e8 1d 2a 1e 00 48 81 e3 00 02 00 00 75 07 e8 2f 25 1e 00 eb 06 e8 28 25 1e 00 fb c6 05 00 a3 31 07 00 42 fd ff ff e8 16 25 1e 00 e9 a5 fe ff ff 41 ff ce bf 58 89 41
RSP: 0018:ffffc900025ce920 EFLAGS: 00000283
RAX: ffffffff8167c7f8 RBX: 0000000000000200 RCX: 0000000000080000
RDX: ffffc90004a3e000 RSI: 000000000000d7e4 RDI: 000000000000d7e5
RBP: ffffc900025ce9e8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520004b9d14 R12: 1ffff920004b9d28
R13: 000000000000004b R14: 0000000000000000 R15: dffffc0000000000
vprintk_default+0x2a/0x40 kernel/printk/printk.c:2478
vprintk+0x93/0xa0 kernel/printk/printk_safe.c:73
_printk+0xd0/0x120 kernel/printk/printk.c:2488
__nla_validate_parse+0x256a/0x2d50 lib/nlattr.c:647
__nla_parse+0x46/0x60 lib/nlattr.c:732
nla_parse_nested_deprecated include/net/netlink.h:1339 [inline]
do_setlink+0x29ea/0x4010 net/core/rtnetlink.c:3080
rtnl_setlink+0x351/0x460 net/core/rtnetlink.c:3233
rtnetlink_rcv_msg+0x87f/0xa00 net/core/rtnetlink.c:6678
netlink_rcv_skb+0x22e/0x4a0 net/netlink/af_netlink.c:2555
rtnetlink_rcv+0x20/0x30 net/core/rtnetlink.c:6696
netlink_unicast_kernel net/netlink/af_netlink.c:1323 [inline]
netlink_unicast+0x8c0/0xa60 net/netlink/af_netlink.c:1349
netlink_sendmsg+0x7f0/0xaf0 net/netlink/af_netlink.c:1899
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
sock_write_iter+0x49c/0x4f0 net/socket.c:1166
do_iter_readv_writev+0x4f2/0x6a0 fs/read_write.c:-1
vfs_writev+0x485/0xcf0 fs/read_write.c:1076
do_writev+0x14d/0x2d0 fs/read_write.c:1123
__do_sys_writev fs/read_write.c:1196 [inline]
__se_sys_writev fs/read_write.c:1193 [inline]
__x64_sys_writev+0x81/0x90 fs/read_write.c:1193
x64_sys_call+0x1fbb/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:21
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: 0033:0x7f7d8718eba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f7d880cf038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f7d873d6090 RCX: 00007f7d8718eba9
RDX: 0000000000000001 RSI: 0000200000000300 RDI: 000000000000000c
RBP: 00007f7d87211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7d873d6128 R14: 00007f7d873d6090 R15: 00007fffa4388618