linux-kernel - [syzbot] [wireless?] WARNING: ODEBUG bug in bss

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Message-ID: <68a03321.050a0220.e29e5.0040.GAE@google.com>
Date: Sat, 16 Aug 2025 00:28:33 -0700
From: syzbot <syzbot+266cecacfaabc2ca17d0@...kaller.appspotmail.com>
To: johannes@...solutions.net, linux-kernel@...r.kernel.org, 
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [wireless?] WARNING: ODEBUG bug in bss_free

Hello,

syzbot found the following issue on:

HEAD commit:    8f5ae30d69d7 Linux 6.17-rc1
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12be85a2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=412ee2f8b704a5e6
dashboard link: https://syzkaller.appspot.com/bug?extid=266cecacfaabc2ca17d0
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
userspace arch: i386

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/005a27f2fde5/disk-8f5ae30d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/eedc3e5b0288/vmlinux-8f5ae30d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/400079450339/bzImage-8f5ae30d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+266cecacfaabc2ca17d0@...kaller.appspotmail.com

------------[ cut here ]------------
ODEBUG: activate active (active state 1) object: ffff888057456e00 object type: rcu_head hint: 0x0
WARNING: CPU: 0 PID: 11283 at lib/debugobjects.c:615 debug_print_object+0x16b/0x1e0 lib/debugobjects.c:612
Modules linked in:
CPU: 0 UID: 0 PID: 11283 Comm: kworker/u8:13 Not tainted 6.17.0-rc1-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: netns cleanup_net
RIP: 0010:debug_print_object+0x16b/0x1e0 lib/debugobjects.c:612
Code: 4c 89 ff e8 57 19 53 fd 4d 8b 0f 48 c7 c7 a0 3c e3 8b 48 8b 34 24 4c 89 ea 89 e9 4d 89 f0 41 54 e8 8a 4a b3 fc 48 83 c4 08 90 <0f> 0b 90 90 ff 05 c7 af d3 0a 48 83 c4 08 5b 41 5c 41 5d 41 5e 41
RSP: 0018:ffffc9000b7674f8 EFLAGS: 00010282
RAX: 109ab45e96de0500 RBX: dffffc0000000000 RCX: ffff88806a35bc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfa1ec R12: 0000000000000000
R13: ffffffff8be33e20 R14: ffff888057456e00 R15: ffffffff8b8bd3c0
FS:  0000000000000000(0000) GS:ffff888125c1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000080186000 CR3: 0000000078eae000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 00000000e08e800c DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 debug_object_activate+0x26a/0x420 lib/debugobjects.c:842
 debug_rcu_head_queue kernel/rcu/rcu.h:236 [inline]
 kvfree_call_rcu+0x4f/0x410 mm/slab_common.c:1953
 bss_free+0xb9/0x250 net/wireless/scan.c:89
 bss_ref_put net/wireless/scan.c:143 [inline]
 cfg80211_put_bss+0x1e2/0x230 net/wireless/scan.c:3353
 cfg80211_dev_free+0x257/0x2d0 net/wireless/core.c:1226
 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+0x22b/0x480 lib/kobject.c:737
 mac80211_hwsim_del_radio+0x2de/0x460 drivers/net/wireless/virtual/mac80211_hwsim.c:5677
 hwsim_exit_net+0x584/0x640 drivers/net/wireless/virtual/mac80211_hwsim.c:6554
 ops_exit_list net/core/net_namespace.c:198 [inline]
 ops_undo_list+0x497/0x990 net/core/net_namespace.c:251
 cleanup_net+0x4c5/0x800 net/core/net_namespace.c:682
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


---
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