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

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Message-ID: <68c4db64.050a0220.2ff435.036a.GAE@google.com>
Date: Fri, 12 Sep 2025 19:48:04 -0700
From: syzbot <syzbot+b0da83a6c0e2e2bddbd4@...kaller.appspotmail.com>
To: hdanton@...a.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
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=452
WARNING: drivers/infiniband/core/cache.c:809 at release_gid_table drivers/infiniband/core/cache.c:806 [inline], CPU#1: kworker/u8:6/2125
WARNING: drivers/infiniband/core/cache.c:809 at gid_table_release_one+0x346/0x4d0 drivers/infiniband/core/cache.c:886, CPU#1: kworker/u8:6/2125
Modules linked in:
CPU: 1 UID: 0 PID: 2125 Comm: kworker/u8:6 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 a0 56 91 8c 4c 89 e6 44 89 fa e8 7b a8 f4 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:ffffc900050a7908 EFLAGS: 00010246
RAX: aa4d2ac68a741700 RBX: ffff888075471cd8 RCX: ffff888029ac9e40
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 1ffff1100ea8e39b R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1c3a6c8 R12: ffff888028a5fe20
R13: ffff888075471c00 R14: ffff8880291e4000 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff888125ae8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555556a47588 CR3: 000000007a4a8000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ib_device_release+0xda/0x1d0 drivers/infiniband/core/device.c:510
 device_release+0x9c/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:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


Tested on:

commit:         590b221e Add linux-next specific files for 20250912
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=16939934580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=12a1d1f3a8199632
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
patch:          https://syzkaller.appspot.com/x/patch.diff?x=12a76b62580000