Subject: [syzbot ci] Re: macsec: Add support for VLAN filtering in offload mode

From: syzbot ci <[email-masked]>
Date: Sat, 07 Mar 2026 10:59:12 -0800

syzbot ci has tested the following series

[v3] macsec: Add support for VLAN filtering in offload mode
https://lore.kernel.org/all/[email-masked]
* [PATCH net v3 1/3] nsim: Add support for VLAN filters
* [PATCH net v3 2/3] selftests: Add macsec offload VLAN tests
* [PATCH net v3 3/3] macsec: Support VLAN-filtering lower devices

and found the following issue:
WARNING in nsim_destroy

Full report is available here:
https://ci.syzbot.org/series/82631b62-e289-479c-90ac-235c613bbae1

***

WARNING in nsim_destroy

tree:      net
URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net.git
base:      b06ccbabe2506fd70b9167a644978b049150224a
arch:      amd64
compiler:  Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
config:    https://ci.syzbot.org/builds/0beaf859-b4a7-4d7b-b4cf-b7e48e02f7a5/config
C repro:   https://ci.syzbot.org/findings/6f1250ca-99f0-4162-b147-c373abd95c96/c_repro
syz repro: https://ci.syzbot.org/findings/6f1250ca-99f0-4162-b147-c373abd95c96/syz_repro

------------[ cut here ]------------
1
WARNING: drivers/net/netdevsim/netdev.c:1235 at nsim_destroy+0x155/0x780 drivers/net/netdevsim/netdev.c:1235, CPU#1: kworker/u8:3/5864
Modules linked in:
CPU: 1 UID: 0 PID: 5864 Comm: kworker/u8:3 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: netns cleanup_net
RIP: 0010:nsim_destroy+0x155/0x780 drivers/net/netdevsim/netdev.c:1235
Code: c4 48 89 c6 48 81 e6 00 f0 00 00 31 ff e8 c3 f0 af fa 4c 89 e0 48 25 00 f0 00 00 74 0c e8 d3 eb af fa eb 2e e8 cc eb af fa 90 <0f> 0b 90 41 ff c4 41 0f b7 d4 be 00 10 00 00 4c 89 ff e8 74 6d 8f
RSP: 0018:ffffc90004857628 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffff110222a31b8 RCX: ffff88816f3fd700
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff90109377 R09: 1ffffffff202126e
R10: dffffc0000000000 R11: fffffbfff202126f R12: 0000000000000000
R13: ffff888111518dc0 R14: dffffc0000000000 R15: ffff888111519508
FS:  0000000000000000(0000) GS:ffff8882a94ae000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feb04e16038 CR3: 000000000e54a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __nsim_dev_port_del+0x14d/0x1b0 drivers/net/netdevsim/dev.c:1528
 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1540 [inline]
 nsim_dev_reload_destroy+0x288/0x490 drivers/net/netdevsim/dev.c:1764
 nsim_dev_reload_down+0x8a/0xc0 drivers/net/netdevsim/dev.c:1038
 devlink_reload+0x1d1/0x8d0 net/devlink/dev.c:461
 devlink_pernet_pre_exit+0x1e6/0x3f0 net/devlink/core.c:507
 ops_pre_exit_list net/core/net_namespace.c:161 [inline]
 ops_undo_list+0x187/0x940 net/core/net_namespace.c:234
 cleanup_net+0x56b/0x800 net/core/net_namespace.c:704
 process_one_work kernel/workqueue.c:3275 [inline]
 process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3358
 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
 kthread+0x388/0x470 kernel/kthread.c:467
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </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: [email-masked]

---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at [email-masked].