linux-kernel - [syzbot] WARNING: still has locks held in tls_rx_reader

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Date:   Wed, 20 Jul 2022 10:09:31 -0700
From:   syzbot <syzbot+16e72110feb2b653ef27@...kaller.appspotmail.com>
To:     borisp@...dia.com, bpf@...r.kernel.org, daniel@...earbox.net,
        davem@...emloft.net, edumazet@...gle.com, john.fastabend@...il.com,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, pabeni@...hat.com,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] WARNING: still has locks held in tls_rx_reader_lock

Hello,

syzbot found the following issue on:

HEAD commit:    e22c88799f26 Merge branch '100GbE' of git://git.kernel.org..
git tree:       net-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=159aa626080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3c46ba1483fd8356
dashboard link: https://syzkaller.appspot.com/bug?extid=16e72110feb2b653ef27
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11d11d78080000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=147797ac080000

The issue was bisected to:

commit 4cbc325ed6b4dce4910be06d9d6940a8b919c59b
Author: Jakub Kicinski <kuba@...nel.org>
Date:   Fri Jul 15 05:22:25 2022 +0000

    tls: rx: allow only one reader at a time

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=16966bac080000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=15966bac080000
console output: https://syzkaller.appspot.com/x/log.txt?x=11966bac080000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+16e72110feb2b653ef27@...kaller.appspotmail.com
Fixes: 4cbc325ed6b4 ("tls: rx: allow only one reader at a time")

====================================
WARNING: syz-executor279/3626 still has locks held!
5.19.0-rc6-syzkaller-01454-ge22c88799f26 #0 Not tainted
------------------------------------
1 lock held by syz-executor279/3626:
 #0: ffff888026449ab0 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1659 [inline]
 #0: ffff888026449ab0 (sk_lock-AF_INET6){+.+.}-{0:0}, at: tls_rx_reader_lock+0x2da/0x4e0 net/tls/tls_sw.c:1817

stack backtrace:
CPU: 0 PID: 3626 Comm: syz-executor279 Not tainted 5.19.0-rc6-syzkaller-01454-ge22c88799f26 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 try_to_freeze include/linux/freezer.h:66 [inline]
 get_signal+0x1424/0x2600 kernel/signal.c:2647
 arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop kernel/entry/common.c:166 [inline]
 exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f66234ef999
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f66234802f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: fffffffffffffe00 RBX: 00007f66235773f0 RCX: 00007f66234ef999
RDX: 00000000000000c1 RSI: 0000000020000080 RDI: 0000000000000003
RBP: 00007f6623545064 R08: 00007f6623480700 R09: 0000000000000000
R10: 00007f6623480700 R11: 0000000000000246 R12: 0100000000000000
R13: e8fece2d4e6d48fb R14: 0cb28def7c465af4 R15: 00007f66235773f8
 </TASK>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches