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

[syzbot]

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+0e8fa9...@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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