[syzbot] [rdma?] WARNING in gid_table_release_one (4)

[syzbot <syzbot+0e8fa99d40c1f50c1527@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    af4e9ef3d784 uaccess: Fix scoped_user_read_access() for 'p..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=131cc952580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c5c49ee0942d1cdb
dashboard link: https://syzkaller.appspot.com/bug?extid=0e8fa99d40c1f50c1527
compiler:       Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-af4e9ef3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/162b63d580f6/vmlinux-af4e9ef3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1a13a91475a2/bzImage-af4e9ef3.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0e8fa99d40c1f50c1527@syzkaller.appspotmail.com

infiniband syz1: set active
infiniband syz1: added syz_tun
RDS/IB: syz1: added
smc: adding ib device syz1 with port count 1
smc:    ib device syz1 port 1 has no pnetid
smc: removing ib device syz1
------------[ cut here ]------------
GID entry ref leak for dev syz1 index 2 ref=1
WARNING: drivers/infiniband/core/cache.c:808 at release_gid_table drivers/infiniband/core/cache.c:805 [inline], CPU#0: syz.0.0/5321
WARNING: drivers/infiniband/core/cache.c:808 at gid_table_release_one+0x1fa/0x440 drivers/infiniband/core/cache.c:885, CPU#0: syz.0.0/5321
Modules linked in:
CPU: 0 UID: 0 PID: 5321 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:release_gid_table drivers/infiniband/core/cache.c:805 [inline]
RIP: 0010:gid_table_release_one+0x2aa/0x440 drivers/infiniband/core/cache.c:885
Code: 00 48 89 ef be 04 00 00 00 e8 f2 0e 92 f9 48 89 e8 48 c1 e8 03 42 0f b6 04 28 84 c0 75 54 8b 4d 00 48 89 df 4c 89 fe 44 89 e2 <67> 48 0f b9 3a 4d 89 ef 4c 8b 6c 24 68 48 8b 44 24 70 42 0f b6 04
RSP: 0018:ffffc9000ec06fd0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff901fbac0 RCX: 0000000000000001
RDX: 0000000000000002 RSI: ffff88801f36c160 RDI: ffffffff901fbac0
RBP: ffff888034720900 R08: ffff888034720903 R09: 1ffff110068e4120
R10: dffffc0000000000 R11: ffffed10068e4121 R12: 0000000000000002
R13: dffffc0000000000 R14: ffff8880443a5ed8 R15: ffff88801f36c160
FS:  00007f2c6167e6c0(0000) GS:ffff88808ca59000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005558b587a000 CR3: 00000000420e0000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ib_device_release+0xd2/0x1c0 drivers/infiniband/core/device.c:482
 device_release+0x9e/0x1d0 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+0x228/0x560 lib/kobject.c:737
 nldev_dellink+0x288/0x320 drivers/infiniband/core/nldev.c:1827
 rdma_nl_rcv_msg drivers/infiniband/core/netlink.c:-1 [inline]
 rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]
 rdma_nl_rcv+0x6d7/0xa10 drivers/infiniband/core/netlink.c:259
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0xa68/0xad0 net/socket.c:2592
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2683 [inline]
 __se_sys_sendmsg net/socket.c:2681 [inline]
 __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2c6079c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2c6167dfe8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f2c60a15fa0 RCX: 00007f2c6079c799
RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 0000000000000008
RBP: 00007f2c60832bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2c60a16038 R14: 00007f2c60a15fa0 R15: 00007ffebd9d0d58
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 48 89             	add    %cl,-0x77(%rax)
   3:	ef                   	out    %eax,(%dx)
   4:	be 04 00 00 00       	mov    $0x4,%esi
   9:	e8 f2 0e 92 f9       	call   0xf9920f00
   e:	48 89 e8             	mov    %rbp,%rax
  11:	48 c1 e8 03          	shr    $0x3,%rax
  15:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax
  1a:	84 c0                	test   %al,%al
  1c:	75 54                	jne    0x72
  1e:	8b 4d 00             	mov    0x0(%rbp),%ecx
  21:	48 89 df             	mov    %rbx,%rdi
  24:	4c 89 fe             	mov    %r15,%rsi
  27:	44 89 e2             	mov    %r12d,%edx
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	4d 89 ef             	mov    %r13,%r15
  32:	4c 8b 6c 24 68       	mov    0x68(%rsp),%r13
  37:	48 8b 44 24 70       	mov    0x70(%rsp),%rax
  3c:	42                   	rex.X
  3d:	0f                   	.byte 0xf
  3e:	b6 04                	mov    $0x4,%dh


---
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