linux-kernel - [syzbot] [net?] [bpf?] WARNING: ODEBUG bug in handle

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Message-ID: <68af39ae.a70a0220.3cafd4.002c.GAE@google.com>
Date: Wed, 27 Aug 2025 10:00:30 -0700
From: syzbot <syzbot+60db000b8468baeddbb1@...kaller.appspotmail.com>
To: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org, 
	daniel@...earbox.net, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
	peterz@...radead.org, syzkaller-bugs@...glegroups.com, tglx@...utronix.de
Subject: [syzbot] [net?] [bpf?] WARNING: ODEBUG bug in handle_softirqs

Hello,

syzbot found the following issue on:

HEAD commit:    4774cfe3543a Merge tag 'scsi-fixes' of git://git.kernel.or..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=140f4e82580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3a936e3316f9e2dc
dashboard link: https://syzkaller.appspot.com/bug?extid=60db000b8468baeddbb1
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/202021f78569/disk-4774cfe3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/694d0f540b2c/vmlinux-4774cfe3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c3c1a8d42953/bzImage-4774cfe3.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+60db000b8468baeddbb1@...kaller.appspotmail.com

------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff888055e82a78 object type: timer_list hint: br_ip6_multicast_port_query_expired+0x0/0x20 net/bridge/br_multicast.c:1682
WARNING: CPU: 0 PID: 15 at lib/debugobjects.c:615 debug_print_object+0x16b/0x1e0 lib/debugobjects.c:612
Modules linked in:
CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.16.0-rc1-syzkaller-00203-g4774cfe3543a #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:debug_print_object+0x16b/0x1e0 lib/debugobjects.c:612
Code: 4c 89 ff e8 17 37 5c fd 4d 8b 0f 48 c7 c7 a0 90 e2 8b 48 8b 34 24 4c 89 ea 89 e9 4d 89 f0 41 54 e8 4a 6a bc fc 48 83 c4 08 90 <0f> 0b 90 90 ff 05 77 9d d9 0a 48 83 c4 08 5b 41 5c 41 5d 41 5e 41
RSP: 0000:ffffc90000147758 EFLAGS: 00010282
RAX: bfb6a7e7ba7ad600 RBX: dffffc0000000000 RCX: ffff88801cef3c00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfa9e4 R12: ffffffff8a423ca0
R13: ffffffff8be29220 R14: ffff888055e82a78 R15: ffffffff8b8ce020
FS:  0000000000000000(0000) GS:ffff888125c52000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8371b71d60 CR3: 000000005b468000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
 debug_check_no_obj_freed+0x3a2/0x470 lib/debugobjects.c:1129
 slab_free_hook mm/slub.c:2312 [inline]
 slab_free mm/slub.c:4643 [inline]
 kfree+0x112/0x440 mm/slub.c:4842
 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
 rcu_do_batch kernel/rcu/tree.c:2576 [inline]
 rcu_core+0xca5/0x1710 kernel/rcu/tree.c:2832
 handle_softirqs+0x286/0x870 kernel/softirq.c:579
 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:968
 smpboot_thread_fn+0x53f/0xa60 kernel/smpboot.c:164
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/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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