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

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Message-ID: <68c2ec01.050a0220.3c6139.003f.GAE@google.com>
Date: Thu, 11 Sep 2025 08:34:25 -0700
From: syzbot <syzbot+b0da83a6c0e2e2bddbd4@...kaller.appspotmail.com>
To: edwards@...dia.com, jgg@...pe.ca, leon@...nel.org, 
	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)

syzbot has found a reproducer for the following issue on:

HEAD commit:    5f540c4aade9 Add linux-next specific files for 20250910
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=157dab12580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5ed48faa2cb8510d
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
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15b52362580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16b41642580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/df0dfb072f52/disk-5f540c4a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/20649042ae30/vmlinux-5f540c4a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4c16358268b8/bzImage-5f540c4a.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b0da83a6c0e2e2bddbd4@...kaller.appspotmail.com

------------[ cut here ]------------
GID entry ref leak for dev syz1 index 2 ref=615
WARNING: drivers/infiniband/core/cache.c:809 at release_gid_table drivers/infiniband/core/cache.c:806 [inline], CPU#0: kworker/u8:2/36
WARNING: drivers/infiniband/core/cache.c:809 at gid_table_release_one+0x346/0x4d0 drivers/infiniband/core/cache.c:886, CPU#0: kworker/u8:2/36
Modules linked in:
CPU: 0 UID: 0 PID: 36 Comm: kworker/u8:2 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 43 91 8c 4c 89 e6 44 89 fa e8 fb 67 f5 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:ffffc90000ac7908 EFLAGS: 00010246
RAX: 621d731dcb27e200 RBX: ffff88806241b8d8 RCX: ffff888141289e40
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 1ffff1100c48371b R08: ffff8880b8724253 R09: 1ffff110170e484a
R10: dffffc0000000000 R11: ffffed10170e484b R12: ffff888027503e00
R13: ffff88806241b800 R14: ffff8880289a2400 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8881259f0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555569847588 CR3: 00000000338c8000 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+0x228/0x480 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+0x47c/0x820 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.