linux-kernel - Re: [syzbot] [rdma?] WARNING in gid_table_release

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Message-ID: <691d3ecd-7960-46bb-b41e-be223e320d33@linux.dev>
Date: Fri, 12 Sep 2025 13:01:13 -0700
From: "Yanjun.Zhu" <yanjun.zhu@...ux.dev>
To: syzbot <syzbot+b0da83a6c0e2e2bddbd4@...kaller.appspotmail.com>,
 edwards@...dia.com, hdanton@...a.com, jgg@...pe.ca, leon@...nel.org,
 leonro@...dia.com, linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
 syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [rdma?] WARNING in gid_table_release_one (3)



On 9/12/25 12:38 PM, yanjun.zhu wrote:
> On 9/11/25 9:42 PM, syzbot wrote:
>> syzbot has bisected this issue to:
>>
>> commit a92fbeac7e94a420b55570c10fe1b90e64da4025
>> Author: Leon Romanovsky <leonro@...dia.com>
>> Date:   Tue May 28 12:52:51 2024 +0000
>>
>>      RDMA/cache: Release GID table even if leak is detected
> 
> Maybe this commit just detects ref leaks and reports ref leak.
> Even though this commit is reverted, this ref leak still occurs.
> 
> The root cause is not in this commit.
> 
> "
> GID entry ref leak for dev syz1 index 2 ref=615
> "
> 
> Ref leaks in dev syz1.
In this link: https://syzkaller.appspot.com/x/log.txt?x=157dab12580000

"
[  184.209420][ T6164] infiniband syz1: set active
[  184.215960][ T6164] infiniband syz1: added syz_tun
[  184.222514][ T6001] veth0_macvtap: entered promiscuous mode
[  184.231935][   T42] wlan0: Created IBSS using preconfigured BSSID 
50:50:50:50:50:50
[  184.239777][   T42] wlan0: Creating new IBSS network, BSSID 
50:50:50:50:50:50
[  184.256962][ T6001] veth1_macvtap: entered promiscuous mode
[  184.276479][ T6164] syz1: rxe_create_cq: returned err = -12 < -- 
rxe_create_cq failed, the test should not continue.

[  184.288430][ T6008] veth0_vlan: entered promiscuous mode
"

err = -12, is -ENOMEM.

It means that memory allocation fails.

Zhu Yanjun

> 
> Zhu Yanjun
> 
>>
>> bisection log:  https://syzkaller.appspot.com/x/bisect.txt? 
>> x=13fc9642580000
>> start commit:   5f540c4aade9 Add linux-next specific files for 20250910
>> git tree:       linux-next
>> final oops:     https://syzkaller.appspot.com/x/report.txt? 
>> x=10029642580000
>> console output: https://syzkaller.appspot.com/x/log.txt?x=17fc9642580000
>> kernel config:  https://syzkaller.appspot.com/x/.config? 
>> x=5ed48faa2cb8510d
>> dashboard link: https://syzkaller.appspot.com/bug? 
>> extid=b0da83a6c0e2e2bddbd4
>> syz repro:      https://syzkaller.appspot.com/x/repro.syz? 
>> x=15b52362580000
>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16b41642580000
>>
>> Reported-by: syzbot+b0da83a6c0e2e2bddbd4@...kaller.appspotmail.com
>> Fixes: a92fbeac7e94 ("RDMA/cache: Release GID table even if leak is 
>> detected")
>>
>> For information about bisection process see: https://goo.gl/ 
>> tpsmEJ#bisection
>