linux-kernel - Re: [syzbot] [bpf?] possible deadlock in __queue_map

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Message-ID: <67f7c5fb.050a0220.355867.0003.GAE@google.com>
Date: Thu, 10 Apr 2025 06:22:03 -0700
From: syzbot <syzbot+8bdfc2c53fb2b63e1871@...kaller.appspotmail.com>
To: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org, 
	daniel@...earbox.net, eddyz87@...il.com, haoluo@...gle.com, 
	john.fastabend@...il.com, jolsa@...nel.org, kpsingh@...nel.org, 
	linux-kernel@...r.kernel.org, martin.lau@...ux.dev, memxor@...il.com, 
	netdev@...r.kernel.org, song@...nel.org, syzkaller-bugs@...glegroups.com, 
	yonghong.song@...ux.dev
Subject: Re: [syzbot] [bpf?] possible deadlock in __queue_map_get

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
unregister_netdevice: waiting for DEV to become free

unregister_netdevice: waiting for batadv0 to become free. Usage count = 3


Tested on:

commit:         e403941b bpf: Convert ringbuf.c to rqspinlock
git tree:       https://github.com/kkdwivedi/linux.git res-lock-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1524f23f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ea2b297a0891c87e
dashboard link: https://syzkaller.appspot.com/bug?extid=8bdfc2c53fb2b63e1871
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.