INFO: task kworker/u4:1:10 blocked for more than 186 seconds.
Not tainted 5.15.0-rc4-next-20211008-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:1 state:D stack:24440 pid: 10 ppid: 2 flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
context_switch kernel/sched/core.c:4953 [inline]
__schedule+0x940/0x26f0 kernel/sched/core.c:6234
schedule+0xd2/0x260 kernel/sched/core.c:6307
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6366
__mutex_lock_common kernel/locking/mutex.c:672 [inline]
__mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:732
rcu_barrier+0x44/0x440 kernel/rcu/tree.c:3996
wg_destruct+0x274/0x430 drivers/net/wireguard/device.c:240
netdev_run_todo+0x6b4/0xa80 net/core/dev.c:10600
default_device_exit_batch+0x2ff/0x3c0 net/core/dev.c:11581
ops_exit_list+0x10d/0x160 net/core/net_namespace.c:171
cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:593
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297
worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
INFO: task syz-executor.3:26071 can't die for more than 186 seconds.
task:syz-executor.3 state:R running task stack:24784 pid:26071 ppid: 23252 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:4953 [inline]
__schedule+0x940/0x26f0 kernel/sched/core.c:6234
schedule+0xd2/0x260 kernel/sched/core.c:6307
schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857
do_wait_for_common kernel/sched/completion.c:85 [inline]
__wait_for_common kernel/sched/completion.c:106 [inline]
wait_for_common kernel/sched/completion.c:117 [inline]
wait_for_completion+0x174/0x270 kernel/sched/completion.c:138
rcu_barrier+0x2db/0x440 kernel/rcu/tree.c:4061
netdev_run_todo+0x2b2/0xa80 net/core/dev.c:10572
rtnl_unlock net/core/rtnetlink.c:112 [inline]
rtnetlink_rcv_msg+0x420/0xb80 net/core/rtnetlink.c:5573
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2491
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x86d/0xda0 net/netlink/af_netlink.c:1916
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:724
____sys_sendmsg+0x6e8/0x810 net/socket.c:2409
___sys_sendmsg+0xf3/0x170 net/socket.c:2463
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2492
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fdaa858e8d9
RSP: 002b:00007fdaa5aa2188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fdaa86931a0 RCX: 00007fdaa858e8d9
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000006
RBP: 00007fdaa85e8cb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd7b34507f R14: 00007fdaa5aa2300 R15: 0000000000022000
Showing all locks held in the system:
5 locks held by kworker/u4:1/10:
#0: ffff8881407b3138 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8881407b3138 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff8881407b3138 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline]
#0: ffff8881407b3138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline]
#0: ffff8881407b3138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline]
#0: ffff8881407b3138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2268
#1: ffffc90000cf7db0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2272
#2: ffffffff8d2e1d90 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xb00 net/core/net_namespace.c:555
#3: ffff888087e152d0 (&wg->device_update_lock){+.+.}-{3:3}, at: wg_destruct+0x14b/0x430 drivers/net/wireguard/device.c:229
#4: ffffffff8bb8a630 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x44/0x440 kernel/rcu/tree.c:3996
1 lock held by khungtaskd/27:
#0: ffffffff8bb813a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
1 lock held by kswapd0/97:
1 lock held by in:imklog/6245:
#0: ffff88807f416af0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
2 locks held by agetty/6476:
#0: ffff88801cad5098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252
#1: ffffc90002a4c2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113
2 locks held by systemd-udevd/26476:
1 lock held by syz-executor.4/26491:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc4-next-20211008-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:254 [inline]
watchdog+0xcb7/0xed0 kernel/hung_task.c:339
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8 Comm: kworker/u4:0 Not tainted 5.15.0-rc4-next-20211008-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:debug_object_init_on_stack+0x0/0x20 lib/debugobjects.c:632
Code: 44 24 18 e9 9f f5 ff ff 66 90 8b 05 02 17 b5 09 85 c0 75 01 c3 31 d2 e9 de f2 ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 <8b> 05 e2 16 b5 09 85 c0 75 01 c3 ba 01 00 00 00 e9 bb f2 ff ff 66
RSP: 0018:ffffc90000cd7b60 EFLAGS: 00000216
RAX: ffff888010e6d700 RBX: 1ffff9200019af6d RCX: 0000000000000000
RDX: ffff888010e6d700 RSI: ffffffff89adec80 RDI: ffffc90000cd7b88
RBP: 000000010000f265 R08: 0000000000000000 R09: 0000000000000003
R10: ffffffff894e3b7f R11: 0000000000000000 R12: ffffc90000cd7b88
R13: ffffffff8b80f180 R14: ffff888010daee00 R15: ffff888010c69800
FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020010000 CR3: 000000000b88e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
init_timer_on_stack_key kernel/time/timer.c:752 [inline]
schedule_timeout+0xf2/0x2a0 kernel/time/timer.c:1879
toggle_allocation_gate mm/kfence/core.c:738 [inline]
toggle_allocation_gate+0x305/0x390 mm/kfence/core.c:723
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297
worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
----------------
Code disassembly (best guess):
0: 44 24 18 rex.R and $0x18,%al
3: e9 9f f5 ff ff jmpq 0xfffff5a7
8: 66 90 xchg %ax,%ax
a: 8b 05 02 17 b5 09 mov 0x9b51702(%rip),%eax # 0x9b51712
10: 85 c0 test %eax,%eax
12: 75 01 jne 0x15
14: c3 retq
15: 31 d2 xor %edx,%edx
17: e9 de f2 ff ff jmpq 0xfffff2fa
1c: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1)
23: 00 00 00 00
27: 0f 1f 00 nopl (%rax)
* 2a: 8b 05 e2 16 b5 09 mov 0x9b516e2(%rip),%eax # 0x9b51712 <-- trapping instruction
30: 85 c0 test %eax,%eax
32: 75 01 jne 0x35
34: c3 retq
35: ba 01 00 00 00 mov $0x1,%edx
3a: e9 bb f2 ff ff jmpq 0xfffff2fa
3f: 66 data16