BUG: rwlock bad magic on CPU, kworker/0:LINE/NUM, ADDR

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 90cf87d1 enetc: Let the hardware auto-advance the taprio b..
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=135479b3500000
kernel config: https://syzkaller.appspot.com/x/.config?x=5720c06118e6c4cc
dashboard link: https://syzkaller.appspot.com/bug?extid=cb987a9c796abc570b47
compiler: gcc (GCC) 10.1.0-syz 20200507

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+cb987a...@syzkaller.appspotmail.com

tipc: 32-bit node address hash set to aa1414ac
BUG: rwlock bad magic on CPU#0, kworker/0:18/18158, 00000000859f2a8d
CPU: 0 PID: 18158 Comm: kworker/0:18 Not tainted 5.10.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events tipc_net_finalize_work
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:118
rwlock_bug kernel/locking/spinlock_debug.c:144 [inline]
debug_write_lock_before kernel/locking/spinlock_debug.c:182 [inline]
do_raw_write_lock+0x1ef/0x280 kernel/locking/spinlock_debug.c:206
tipc_mon_reinit_self+0x1f7/0x630 net/tipc/monitor.c:685
tipc_net_finalize net/tipc/net.c:134 [inline]
tipc_net_finalize+0x1df/0x310 net/tipc/net.c:125
process_one_work+0x933/0x15a0 kernel/workqueue.c:2272
worker_thread+0x64c/0x1120 kernel/workqueue.c:2418
kthread+0x3af/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296


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[Dmitry Vyukov]

There was also "general protection fault in tipc_mon_reinit_self":
https://syzkaller.appspot.com/bug?id=dc141b9a05cb48d3d9b46837bc2fdc9e7d95dbe9
which also happened once. Smells like an intricate race condition.

> tipc_net_finalize net/tipc/net.c:134 [inline]
> tipc_net_finalize+0x1df/0x310 net/tipc/net.c:125
> process_one_work+0x933/0x15a0 kernel/workqueue.c:2272
> worker_thread+0x64c/0x1120 kernel/workqueue.c:2418
> kthread+0x3af/0x4a0 kernel/kthread.c:292
> ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
>
>
> ---
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> See https://goo.gl/tpsmEJ for more information about syzbot.
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>
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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.