netdev - [syzbot ci] Re: xsk: fix immature cq descriptor production

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Message-ID: <68945e9d.050a0220.7f033.0041.GAE@google.com>
Date: Thu, 07 Aug 2025 01:06:53 -0700
From: syzbot ci <syzbot+ci0a6ec7a9d4421fcc@...kaller.appspotmail.com>
To: aleksander.lobakin@...el.com, andrii@...nel.org, ast@...nel.org, 
	bpf@...r.kernel.org, daniel@...earbox.net, e.kubanski@...tner.samsung.com, 
	maciej.fijalkowski@...el.com, magnus.karlsson@...el.com, 
	netdev@...r.kernel.org
Cc: syzbot@...ts.linux.dev, syzkaller-bugs@...glegroups.com
Subject: [syzbot ci] Re: xsk: fix immature cq descriptor production

syzbot ci has tested the following series

[v3] xsk: fix immature cq descriptor production
https://lore.kernel.org/all/20250806154127.2161434-1-maciej.fijalkowski@intel.com
* [PATCH v3 bpf] xsk: fix immature cq descriptor production

and found the following issue:
WARNING in xsk_create

Full report is available here:
https://ci.syzbot.org/series/ed9b41fb-c772-4c8d-ab6b-07919dac7f3f

***

WARNING in xsk_create

tree:      bpf
URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf.git
base:      e8d780dcd957d80725ad5dd00bab53b856429bc0
arch:      amd64
compiler:  Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
config:    https://ci.syzbot.org/builds/ac640846-151f-4c3e-8a63-10a1d56881e1/config
syz repro: https://ci.syzbot.org/findings/34ebabe4-f302-4e4b-9951-0a44d704970a/syz_repro

------------[ cut here ]------------
kmem_cache of name 'xsk_generic_xmit_cache' already exists
WARNING: CPU: 1 PID: 6031 at mm/slab_common.c:110 kmem_cache_sanity_check mm/slab_common.c:109 [inline]
WARNING: CPU: 1 PID: 6031 at mm/slab_common.c:110 __kmem_cache_create_args+0xa3/0x320 mm/slab_common.c:307
Modules linked in:
CPU: 1 UID: 0 PID: 6031 Comm: syz.2.21 Not tainted 6.16.0-syzkaller-06699-ge8d780dcd957-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:kmem_cache_sanity_check mm/slab_common.c:109 [inline]
RIP: 0010:__kmem_cache_create_args+0xa3/0x320 mm/slab_common.c:307
Code: 81 fc 58 a5 22 8e 74 26 49 8b 7c 24 f8 48 89 de e8 32 81 67 09 85 c0 75 e2 90 48 c7 c7 f2 e1 98 8d 48 89 de e8 5e 00 7f ff 90 <0f> 0b 90 90 48 89 df be 20 00 00 00 e8 cc 82 67 09 48 85 c0 0f 85
RSP: 0018:ffffc90002dffcc8 EFLAGS: 00010246
RAX: 2d59588130194a00 RBX: ffffffff8cb69260 RCX: ffff888105d20000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 0000000000000010 R08: ffffc90002dff9e7 R09: 1ffff920005bff3c
R10: dffffc0000000000 R11: fffff520005bff3d R12: ffff88801fde6928
R13: 0000607e5bfbe4c0 R14: ffffc90002dffd60 R15: 0000000000000098
FS:  00007f455d4c26c0(0000) GS:ffff8881a3c7e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f455c7b7dac CR3: 0000000106b38000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __kmem_cache_create include/linux/slab.h:353 [inline]
 xsk_create+0x67e/0x8d0 net/xdp/xsk.c:1817
 __sock_create+0x4b3/0x9f0 net/socket.c:1589
 sock_create net/socket.c:1647 [inline]
 __sys_socket_create net/socket.c:1684 [inline]
 __sys_socket+0xd7/0x1b0 net/socket.c:1731
 __do_sys_socket net/socket.c:1745 [inline]
 __se_sys_socket net/socket.c:1743 [inline]
 __x64_sys_socket+0x7a/0x90 net/socket.c:1743
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f455c58ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f455d4c2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007f455c7b5fa0 RCX: 00007f455c58ebe9
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 000000000000002c
RBP: 00007f455c611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f455c7b6038 R14: 00007f455c7b5fa0 R15: 00007ffd678e28c8
 </TASK>


***

If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
Tested-by: syzbot@...kaller.appspotmail.com

---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzkaller@...glegroups.com.