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Date: Fri, 01 Mar 2024 20:01:03 -0800
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Subject: Re: [syzbot] [rds?] WARNING in rds_conn_connect_if_down
From: syzbot <syzbot+d4faee732755bba9838e@syzkaller.appspotmail.com>
To: eadavis@qq.com, linux-kernel@vger.kernel.org, 
	syzkaller-bugs@googlegroups.com
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Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in rds_conn_connect_if_down

------------[ cut here ]------------
WARNING: CPU: 1 PID: 5694 at net/rds/connection.c:933 rds_conn_connect_if_down+0x95/0xb0 net/rds/connection.c:933
Modules linked in:
CPU: 1 PID: 5694 Comm: syz-executor.0 Not tainted 6.8.0-rc6-syzkaller-g5ad3cb0ed525-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:rds_conn_connect_if_down+0x95/0xb0 net/rds/connection.c:933
Code: 00 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 ee f8 43 f7 49 8b 3e 5b 41 5e 41 5f e9 f1 fa ff ff e8 2c db e1 f6 90 <0f> 0b 90 eb cb 89 d9 80 e1 07 38 c1 7c a9 48 89 df e8 35 f8 43 f7
RSP: 0018:ffffc900050c78a0 EFLAGS: 00010293
RAX: ffffffff8ab19224 RBX: 0000000000000002 RCX: ffff88807f89bb80
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffffc900050c7ad0 R08: ffffffff8ab191eb R09: ffffffff8ab2b261
R10: 0000000000000002 R11: ffff88807f89bb80 R12: ffff8880218c2800
R13: ffff88802b6d9740 R14: ffff8880182f2000 R15: dffffc0000000000
FS:  00007f22049de6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020d10000 CR3: 000000006ea98000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rds_sendmsg+0x1409/0x2280 net/rds/send.c:1319
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667
 do_syscall_64+0xf9/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f2204e7dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f22049de0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f2204fac120 RCX: 00007f2204e7dda9
RDX: 0000000000000000 RSI: 0000000020000800 RDI: 0000000000000003
RBP: 00007f2204eca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f2204fac120 R15: 00007ffff6293078
 </TASK>


Tested on:

commit:         5ad3cb0e Merge tag 'for-v6.8-rc2' of git://git.kernel...
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=120ebcf2180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fad652894fc96962
dashboard link: https://syzkaller.appspot.com/bug?extid=d4faee732755bba9838e
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=107427ac180000