INFO: task syz-executor.4:29762 blocked for more than 143 seconds.
Not tainted 5.12.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:28272 pid:29762 ppid: 8476 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:4322 [inline]
__schedule+0x911/0x21b0 kernel/sched/core.c:5073
schedule+0xcf/0x270 kernel/sched/core.c:5152
rwsem_down_write_slowpath+0x7e5/0x1200 kernel/locking/rwsem.c:1106
__down_write_common kernel/locking/rwsem.c:1261 [inline]
__down_write_common kernel/locking/rwsem.c:1258 [inline]
__down_write kernel/locking/rwsem.c:1270 [inline]
down_write+0x137/0x150 kernel/locking/rwsem.c:1407
unregister_netdevice_notifier+0x1e/0x170 net/core/dev.c:1949
raw_release+0x58/0x8a0 net/can/raw.c:352
__sock_release+0xcd/0x280 net/socket.c:599
sock_close+0x18/0x20 net/socket.c:1258
__fput+0x288/0x920 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:140
exit_task_work include/linux/task_work.h:30 [inline]
do_exit+0xbfc/0x2a60 kernel/exit.c:825
do_group_exit+0x125/0x310 kernel/exit.c:922
get_signal+0x42c/0x2100 kernel/signal.c:2777
arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789
handle_signal_work kernel/entry/common.c:147 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x466459
RSP: 002b:00007fdf3bc39188 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: 0000000000000003 RBX: 000000000056bf60 RCX: 0000000000466459
RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001d
RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffdbb268fff R14: 00007fdf3bc39300 R15: 0000000000022000
Showing all locks held in the system:
3 locks held by kworker/u4:3/105:
1 lock held by khungtaskd/1626:
#0: ffffffff8bf74360 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6327
1 lock held by in:imklog/8175:
#0: ffff888014b3a370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:961
3 locks held by kworker/u4:11/23649:
#0: ffff88814079b138 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff88814079b138 ((wq_completion)netns){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
#0: ffff88814079b138 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
#0: ffff88814079b138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
#0: ffff88814079b138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
#0: ffff88814079b138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x871/0x1600 kernel/workqueue.c:2246
#1: ffffc90009cd7da8 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1600 kernel/workqueue.c:2250
#2: ffffffff8d659b10 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xb10 net/core/net_namespace.c:557
2 locks held by syz-executor.4/29762:
#0: ffff8880767b0750 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline]
#0: ffff8880767b0750 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: __sock_release+0x86/0x280 net/socket.c:598
#1: ffffffff8d659b10 (pernet_ops_rwsem){++++}-{3:3}, at: unregister_netdevice_notifier+0x1e/0x170 net/core/dev.c:1949
1 lock held by syz-executor.4/30266:
#0: ffffffff8d659b10 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2fa/0x760 net/core/net_namespace.c:470
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1626 Comm: khungtaskd Not tainted 5.12.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x141/0x1d7 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
watchdog+0xd48/0xfb0 kernel/hung_task.c:294
kthread+0x3b1/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4833 Comm: systemd-journal Not tainted 5.12.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0033:0x7f906b381880
Code: b8 02 00 00 00 0f 05 48 8b 3c 24 48 89 c2 e8 67 f6 ff ff 48 89 d0 48 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d 08 77 20 00 <f7> d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 29 bb 20 00
RSP: 002b:00007fffbf091848 EFLAGS: 00000202
RAX: fffffffffffffffe RBX: 00007fffbf091b50 RCX: fffffffffffffe00
RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055ad1acc1240
RBP: 000000000000000d R08: 00000000000001c0 R09: 00000000ffffffff
R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000055ad1acb3040 R14: 00007fffbf091b10 R15: 000055ad1acc0530
FS: 00007f906bdf28c0 GS: 0000000000000000