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

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Message-ID: <68c498d5.050a0220.2ff435.0367.GAE@google.com>
Date: Fri, 12 Sep 2025 15:04:05 -0700
From: syzbot <syzbot+b0da83a6c0e2e2bddbd4@...kaller.appspotmail.com>
To: jgg@...pe.ca, leon@...nel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com, yanjun.zhu@...ux.dev
Subject: Re: [syzbot] [rdma?] WARNING in gid_table_release_one (3)

Hello,

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

------------[ cut here ]------------
GID entry ref leak for dev syz1 index 2 ref=445
WARNING: CPU: 1 PID: 1088 at drivers/infiniband/core/cache.c:809 release_gid_table drivers/infiniband/core/cache.c:806 [inline]
WARNING: CPU: 1 PID: 1088 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: 1088 Comm: kworker/u8:5 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:ffffc90003d0f908 EFLAGS: 00010246
RAX: 11007f8b953ea200 RBX: ffff88802d562cd8 RCX: ffff888026adda00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 1ffff11005aac59b R08: ffff8880b8724253 R09: 1ffff110170e484a
R10: dffffc0000000000 R11: ffffed10170e484b R12: ffff888028265480
R13: ffff88802d562c00 R14: ffff8880779b1800 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff888125d16000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000240 CR3: 000000007612e000 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:         dd87fd3f 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=144a9934580000
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.