From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi2-f4.google.com (mail-oi2-f4.google.com [74.125.231.196]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B280C304BDF for ; Tue, 25 Aug 2026 01:37:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.196 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787621867; cv=none; b=tZ/9PMNv9WIXvBufKg6+dvsfEjfQQ0TJoeH8rQB+ZnAkrV4haBVrDBzmHzIfucXgpBGY8ZZdHdxk3ZSckt3rrC77A+U7AGMv1zM1qoeCbcBZsmHfjDg51AvJA9HPlZYVv6i6HvmMsy3MxhccbI380C6pdUwX0u/M1vrWgPSy1mo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787621867; c=relaxed/simple; bh=9Dw5zUP4FEQbfZad9C6UYP7+xUYXOAdRDpnna5GLKac=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=rh98UnLpd56/my/lNdGmRfjyobHSMT0F4erUUuq8xF6ukF7vHQBQdh1mAKcjS+twKMZbeiE9E97C/C7B3tMpZSJ86UQfTOVkcaTSh4RFvBmBo4XR5FF53OZsqe/Go7tkO6ieCO3hLUmK2B+LITrMEFYmK4T9QEqhFtNJjMotm+A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=74.125.231.196 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oi2-f4.google.com with SMTP id 5614622812f47-4ab2d8e7e4cso1118190b6e.1 for ; Mon, 24 Aug 2026 18:37:45 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787621864; x=1788226664; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=ycCjzGwowX5X5Ud8FvH0v8aZ95u8DKe9u08t1TKKXbk=; b=YEZRwbY0o1WFQDpyLak+5JFkFMrpqxsU0sP7HVOsBrXWICIhAKF+MpsTsekaKG1wuX PRcHEhW8L5YDlDWaSO0vbJ/0/OeL6nr4D0xMLY/al0xcyGUeQEn0q6xEhxKoVDrcrD5D UAZq06mDmXXSameLmCVqnoKK9zc6dZ+b/DyCJOyiy7VaK1VHpV0vFCc9tQdmuDNRadwQ CP1KSMqWNHrR3GlrTTOmGzdIinkC9fulXWStioaWCCjNuutioxDOoN9oyQCNCoBslSkD zBFJbaKSWksOFW9luFITKRKsu1fplUaI8ABcoHMSKtA7VPc3M08Y2RcS8nl31PBiXzGf J4wA== X-Gm-Message-State: AFuF++kA/HnYbsjQJnW8fsOgrENHzJYpFijffO2fEzW4HvCBMHJPQYGX NyccQRefbXUavqope5WbNBVvzHsNuyOEoxRaY/L3WEvMrQg7QW4gVVnWFSZrP4PR877rw6bbosa 58uUJ/OIYq/SHp8hlbpPG07QRiQ+4dIXzh/I4O0AyJrUHT3nZWgO9J0WadtAzPA== Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:2293:b0:4b2:98a3:a567 with SMTP id 5614622812f47-4b2ef1bea44mr31947539b6e.4.1787621864696; Mon, 24 Aug 2026 18:37:44 -0700 (PDT) Date: Mon, 24 Aug 2026 18:37:44 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a8cf1e8.dbb3a75c.7844.001a.GAE@google.com> Subject: [syzbot] [kernel?] WARNING: ODEBUG bug in vub300_disconnect From: syzbot To: linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, syzkaller-bugs@googlegroups.com, ulfh@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 0a0d1d55dad5 Merge tag 'scftorture.2026.08.18a' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=126be415580000 kernel config: https://syzkaller.appspot.com/x/.config?x=335632b21d0ce540 dashboard link: https://syzkaller.appspot.com/bug?extid=f4a0159ce6802a0a4774 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/b00b3ccadcaf/disk-0a0d1d55.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0e672b557a64/vmlinux-0a0d1d55.xz kernel image: https://storage.googleapis.com/syzbot-assets/b5c1ac823fac/bzImage-0a0d1d55.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f4a0159ce6802a0a4774@syzkaller.appspotmail.com ------------[ cut here ]------------ ODEBUG: free active (active state 0) object: ffff888077279270 object type: timer_list hint: vub300_inactivity_timer_expired+0x0/0x3f0 include/linux/refcount.h:-1 WARNING: lib/debugobjects.c:632 at debug_print_object+0xec/0x230 lib/debugobjects.c:629, CPU#0: kworker/0:1/10 Modules linked in: CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Workqueue: usb_hub_wq hub_event RIP: 0010:debug_print_object+0x18a/0x230 lib/debugobjects.c:629 Code: f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 5d 6f 4f fd 4d 8b 0f 4c 89 ef 48 8b 74 24 08 48 89 ea 44 89 e1 4d 89 f0 ff 34 24 <67> 48 0f b9 3a 48 83 c4 08 ff 05 53 75 92 0b 48 83 c4 10 5b 41 5c RSP: 0018:ffffc900000f7218 EFLAGS: 00010246 RAX: 1ffffffff181ede4 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: ffffffff8c6d6340 RSI: ffffffff8c6d5dc0 RDI: ffffffff9084da30 RBP: ffffffff8c6d6340 R08: ffff888077279270 R09: ffffffff8c0f8280 R10: dffffc0000000000 R11: ffffffff81b32b80 R12: 0000000000000000 R13: ffffffff9084da30 R14: ffff888077279270 R15: ffffffff8c0f6f20 FS: 0000000000000000(0000) GS:ffff888124cf3000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5b6cbceff8 CR3: 000000000eb46000 CR4: 0000000000350ef0 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:1171 [inline] debug_check_no_obj_freed+0x2e3/0x450 lib/debugobjects.c:1201 slab_free_hook mm/slub.c:2609 [inline] slab_free mm/slub.c:6372 [inline] kfree+0x13e/0x640 mm/slub.c:6687 device_release+0xc4/0x1f0 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+0x222/0x550 lib/kobject.c:737 vub300_delete drivers/mmc/host/vub300.c:379 [inline] kref_put include/linux/kref.h:65 [inline] vub300_disconnect+0x280/0x2f0 drivers/mmc/host/vub300.c:2388 usb_unbind_interface+0x295/0x9f0 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:618 [inline] __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x4f5/0x880 drivers/base/dd.c:1372 bus_remove_device+0x444/0x560 drivers/base/bus.c:664 device_del+0x524/0x8f0 drivers/base/core.c:3965 usb_disable_device+0x3d4/0x8d0 drivers/usb/core/message.c:1478 usb_disconnect+0x346/0x9a0 drivers/usb/core/hub.c:2345 hub_port_connect drivers/usb/core/hub.c:5415 [inline] hub_port_connect_change drivers/usb/core/hub.c:5715 [inline] port_event drivers/usb/core/hub.c:5879 [inline] hub_event+0x1bbb/0x4d30 drivers/usb/core/hub.c:5961 process_one_work kernel/workqueue.c:3387 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3470 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3551 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: f8 clc 1: 48 c1 e8 03 shr $0x3,%rax 5: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) 9: 74 08 je 0x13 b: 4c 89 ff mov %r15,%rdi e: e8 5d 6f 4f fd call 0xfd4f6f70 13: 4d 8b 0f mov (%r15),%r9 16: 4c 89 ef mov %r13,%rdi 19: 48 8b 74 24 08 mov 0x8(%rsp),%rsi 1e: 48 89 ea mov %rbp,%rdx 21: 44 89 e1 mov %r12d,%ecx 24: 4d 89 f0 mov %r14,%r8 27: ff 34 24 push (%rsp) * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 48 83 c4 08 add $0x8,%rsp 33: ff 05 53 75 92 0b incl 0xb927553(%rip) # 0xb92758c 39: 48 83 c4 10 add $0x10,%rsp 3d: 5b pop %rbx 3e: 41 5c pop %r12 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup