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

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Message-ID: <68c49440.a70a0220.3543fc.003d.GAE@google.com>
Date: Fri, 12 Sep 2025 14:44:32 -0700
From: syzbot <syzbot+b0da83a6c0e2e2bddbd4@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Forwarded: Re: [syzbot] [rdma?] WARNING in gid_table_release_one (3)

For archival purposes, forwarding an incoming command email to
linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com.

***

Subject: Re: [syzbot] [rdma?] WARNING in gid_table_release_one (3)
Author: yanjun.zhu@...ux.dev

#syz test: https://github.com/zhuyj/linux.git 
v6.17_fix_gid_table_release_one

On 9/12/25 2:43 PM, syzbot wrote:
>> #syz test:https://github.com/zhuyj/linux.git v6.17_fix_gid_table_release_one
> unknown command "test:https://github.com/zhuyj/linux.git"
>
>> On 9/12/25 2:20 PM, syzbot wrote:
>>> Hello,
>>>
>>> syzbot has tested the proposed patch but the reproducer is still triggering an issue:
>>> WARNING in gid_table_release_one
>>>
>>> WARNING: CPU: 1 PID: 1342 at drivers/infiniband/core/cache.c:809 release_gid_table drivers/infiniband/core/cache.c:806 [inline]
>>> WARNING: CPU: 1 PID: 1342 at drivers/infiniband/core/cache.c:809 gid_table_release_one+0x346/0x4d0 drivers/infiniband/core/cache.c:886
>>> Modules linked in:
>>> CPU: 1 UID: 0 PID: 1342 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT(full)
>>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
>>> Workqueue: ib-unreg-wq ib_unregister_work
>>> RIP: 0010:release_gid_table drivers/infiniband/core/cache.c:806 [inline]
>>> RIP: 0010:gid_table_release_one+0x346/0x4d0 drivers/infiniband/core/cache.c:886
>>> Code: e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 3d 41 8b 0e 48 c7 c7 00 46 71 8c 4c 89 e6 44 89 fa e8 3b a5 fa f8 90 <0f> 0b 90 90 e9 e3 fe ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c
>>> RSP: 0018:ffffc90004bff908 EFLAGS: 00010246
>>> RAX: 6115427e6ab01100 RBX: ffff88807855c2d8 RCX: ffff888027abbc00
>>> RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
>>> RBP: 1ffff1100f0ab85b R08: 0000000000000003 R09: 0000000000000004
>>> R10: dffffc0000000000 R11: fffffbfff1bfa24c R12: ffff8880206a4b40
>>> R13: ffff88807855c200 R14: ffff88801ffd5a00 R15: 0000000000000002
>>> FS:  0000000000000000(0000) GS:ffff888125d16000(0000) knlGS:0000000000000000
>>> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> CR2: 0000200000000240 CR3: 000000005e54a000 CR4: 00000000003526f0
>>> Call Trace:
>>>    <TASK>
>>>    ib_device_release+0xd2/0x1c0 drivers/infiniband/core/device.c:509
>>>    device_release+0x99/0x1c0 drivers/base/core.c:-1
>>>    kobject_cleanup lib/kobject.c:689 [inline]
>>>    kobject_release lib/kobject.c:720 [inline]
>>>    kref_put include/linux/kref.h:65 [inline]
>>>    kobject_put+0x22b/0x480 lib/kobject.c:737
>>>    process_one_work kernel/workqueue.c:3236 [inline]
>>>    process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
>>>    worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
>>>    kthread+0x70e/0x8a0 kernel/kthread.c:463
>>>    ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:148
>>>    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
>>>    </TASK>
>>>
>>>
>>> Tested on:
>>>
>>> commit:         e5320428 RDMA/rxe: Add logs to find out the root cause
>>> git tree:https://github.com/zhuyj/linux.git v6.17_fix_gid_table_release_one
>>> console output:https://syzkaller.appspot.com/x/log.txt?x=12829934580000
>>> kernel config:https://syzkaller.appspot.com/x/.config?x=4239c29711f936f
>>> dashboard link:https://syzkaller.appspot.com/bug?extid=b0da83a6c0e2e2bddbd4
>>> compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
>>>
>>> Note: no patches were applied.