From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f78.google.com (mail-ot1-f78.google.com [209.85.210.78]) (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 E642D3859E3 for ; Mon, 20 Apr 2026 21:36:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776720983; cv=none; b=bQX9ATlpQHHYYBcxXMbdYAsVpLUPCDkJvvT2U8Hn7kKeRdlkTRUYxL/Qt4X3HIJHADLdfbsTj4ordhNhJ9ouFN9fCtWyIjehS7pgyXPwqdVgsIvEmVI9OftWc8pXQVgfhbFitind1OI9r15AHYMi/jwE5Z1LHBaVPBreqeL8B2Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776720983; c=relaxed/simple; bh=zUSqDae8ehhpIsaM8InHRH02iEAP/P1P5q7nP5d4CWE=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=Mh0be0fh6xn30a/ZEH0yR/N0liyIlDqjdPbgOIv+ef1SxhPZyV+6ujb7+6wROG7+G+yZedMg69NvF+zwoDZZF4DgKHfgbocptEh52hBi/U1t/u96j00bPgxCuyP70xlOHt0/cSQQZht+RxbrqGD8UxEUtEiSFr8mkWV+RAgJ9tA= 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=209.85.210.78 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-ot1-f78.google.com with SMTP id 46e09a7af769-7dbb6b95836so7363583a34.3 for ; Mon, 20 Apr 2026 14:36:21 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1776720981; x=1777325781; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=DEXQxlFpDs5DHiWxH1HFe8jxhbypKF6txLcWt+SIIVs=; b=hoTquDJDB2yaG85emf9tcX1GaLF2fDOqTp4D2+hEorWkccd88AosPy72IU48mnkoOV 546m4WlZpuaUKd+WQGHMlH4eGOb79s4ycnGnkCxClqkyofI9X/LJwYKfzFqao9rvBmRD hHTWdIRQcRORh6EaJy4b5aYSgucwuQwiuBhoAuNmNMTI27WrJWmqHblswvIQsz6RKARG 6jcMI2NDdwphAKSyKMQSp1w7kDZAdb+EvfzweklXiPb+zEpjO/x0h8bpWUZYuSEN3pom v34OlLOpw7RZKxJ/bhloAaw4/H0kSbUwK/HdlAxct2fMnbfjYVr0LZ6ChFg/Hd/6UOOM BNnQ== X-Forwarded-Encrypted: i=1; AFNElJ+hO/7Q5ODMxBvPYV+T6fhsiZc7usXmnTf+w1I4ee+5Oe20u5dIRNA1JW5f7R7F7cWRj+qUoTHjaIM=@vger.kernel.org X-Gm-Message-State: AOJu0YwlKdNpMvW1Icn2SUlWoadprFHTb9T2DlXxH2fxAgTdhzxwI09f c06ARXe24aiWC5AuNI0871GEnXFr19c1HEDXbbXQbkOjunO6o7OL0LQTgMVqK4sbX3XXKAAlzOK MnSK4PUCkBZe4DUcnkYY/pOqqa6o29J8fk95mgBtN/63KdWcZpP5mKUtSErQ= Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:16a2:b0:67e:42b0:b35e with SMTP id 006d021491bc7-69462dee1dfmr7430813eaf.4.1776720981030; Mon, 20 Apr 2026 14:36:21 -0700 (PDT) Date: Mon, 20 Apr 2026 14:36:21 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69e69c55.050a0220.24bfd3.0029.GAE@google.com> Subject: [syzbot] [i2c?] [usb?] WARNING: ODEBUG bug in i2c_device_remove (2) From: syzbot To: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com, wsa+renesas@sang-engineering.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: c7275b05bc42 Add linux-next specific files for 20260417 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1782f4ce580000 kernel config: https://syzkaller.appspot.com/x/.config?x=10db2bdce6adb49e dashboard link: https://syzkaller.appspot.com/bug?extid=019ced393ab913002b75 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10b79906580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16688cf2580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ffefe34549f8/disk-c7275b05.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f679e5d59c0c/vmlinux-c7275b05.xz kernel image: https://storage.googleapis.com/syzbot-assets/714f96953b57/bzImage-c7275b05.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+019ced393ab913002b75@syzkaller.appspotmail.com usb 1-1: DVB: registering adapter 1 frontend 0 (Realtek RTL2832 (DVB-T))... dvbdev: dvb_create_media_entity: media entity 'Realtek RTL2832 (DVB-T)' registered. DVB: Unable to find symbol r820t_attach() ------------[ cut here ]------------ ODEBUG: free active (active state 0) object: ffff8880258626e8 object type: timer_list hint: rtl2832_i2c_gate_work+0x0/0x100 drivers/media/dvb-frontends/rtl2832.c:-1 WARNING: lib/debugobjects.c:632 at debug_print_object lib/debugobjects.c:629 [inline], CPU#1: kworker/1:2/821 WARNING: lib/debugobjects.c:632 at __debug_check_no_obj_freed lib/debugobjects.c:1116 [inline], CPU#1: kworker/1:2/821 WARNING: lib/debugobjects.c:632 at debug_check_no_obj_freed+0x405/0x550 lib/debugobjects.c:1146, CPU#1: kworker/1:2/821 Modules linked in: CPU: 1 UID: 0 PID: 821 Comm: kworker/1:2 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Workqueue: usb_hub_wq hub_event RIP: 0010:debug_print_object lib/debugobjects.c:629 [inline] RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:1116 [inline] RIP: 0010:debug_check_no_obj_freed+0x44a/0x550 lib/debugobjects.c:1146 Code: 89 44 24 20 e8 87 40 6f fd 48 8b 44 24 20 4c 8b 4d 00 4c 89 ef 48 c7 c6 a0 61 ca 8b 48 c7 c2 20 67 ca 8b 8b 0c 24 4d 89 f8 50 <67> 48 0f b9 3a 48 83 c4 08 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc RSP: 0018:ffffc90004fa67b8 EFLAGS: 00010246 RAX: ffffffff8767dab0 RBX: ffffffff99edac98 RCX: 0000000000000000 RDX: ffffffff8bca6720 RSI: ffffffff8bca61a0 RDI: ffffffff8fd9d990 RBP: ffffffff8b6f5560 R08: ffff8880258626e8 R09: ffffffff8b6f68e0 R10: dffffc0000000000 R11: ffffffff81b15270 R12: ffff888025862800 R13: ffffffff8fd9d990 R14: ffff888025862000 R15: ffff8880258626e8 FS: 0000000000000000(0000) GS:ffff888125b62000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2ec609ae9c CR3: 000000003956c000 CR4: 00000000003526f0 Call Trace: slab_free_hook mm/slub.c:2620 [inline] slab_free mm/slub.c:6246 [inline] kfree+0x13e/0x6c0 mm/slub.c:6561 i2c_device_remove+0x88/0x220 drivers/i2c/i2c-core-base.c:631 device_remove drivers/base/dd.c:619 [inline] __device_release_driver drivers/base/dd.c:1352 [inline] device_release_driver_internal+0x46f/0x870 drivers/base/dd.c:1375 bus_remove_device+0x45a/0x570 drivers/base/bus.c:657 device_del+0x52b/0x900 drivers/base/core.c:3895 device_unregister+0x21/0xf0 drivers/base/core.c:3936 rtl28xxu_frontend_detach+0x168/0x210 drivers/media/usb/dvb-usb-v2/rtl28xxu.c:1105 dvb_usbv2_adapter_frontend_exit drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:733 [inline] dvb_usbv2_adapter_exit drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:830 [inline] dvb_usbv2_exit+0x44c/0xb80 drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:844 dvb_usbv2_probe+0x4c0/0x3c20 drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:994 usb_probe_interface+0x659/0xc70 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x267/0xaf0 drivers/base/dd.c:709 __driver_probe_device+0x1ef/0x380 drivers/base/dd.c:871 driver_probe_device+0x4f/0x240 drivers/base/dd.c:901 __device_attach_driver+0x279/0x430 drivers/base/dd.c:1029 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c8/0x450 drivers/base/dd.c:1101 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1156 bus_probe_device+0x12d/0x220 drivers/base/bus.c:613 device_add+0x7e9/0xbb0 drivers/base/core.c:3706 usb_set_configuration+0x1a87/0x2110 drivers/usb/core/message.c:2268 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250 usb_probe_device+0x1c4/0x3b0 drivers/usb/core/driver.c:291 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x267/0xaf0 drivers/base/dd.c:709 __driver_probe_device+0x1ef/0x380 drivers/base/dd.c:871 driver_probe_device+0x4f/0x240 drivers/base/dd.c:901 __device_attach_driver+0x279/0x430 drivers/base/dd.c:1029 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c8/0x450 drivers/base/dd.c:1101 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1156 bus_probe_device+0x12d/0x220 drivers/base/bus.c:613 device_add+0x7e9/0xbb0 drivers/base/core.c:3706 usb_new_device+0x9f8/0x16e0 drivers/usb/core/hub.c:2695 hub_port_connect drivers/usb/core/hub.c:5567 [inline] hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] port_event drivers/usb/core/hub.c:5871 [inline] hub_event+0x2a49/0x4f60 drivers/usb/core/hub.c:5953 process_one_work+0x9a3/0x1710 kernel/workqueue.c:3312 process_scheduled_works kernel/workqueue.c:3403 [inline] worker_thread+0xba8/0x11e0 kernel/workqueue.c:3489 kthread+0x388/0x470 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: 89 44 24 20 mov %eax,0x20(%rsp) 4: e8 87 40 6f fd call 0xfd6f4090 9: 48 8b 44 24 20 mov 0x20(%rsp),%rax e: 4c 8b 4d 00 mov 0x0(%rbp),%r9 12: 4c 89 ef mov %r13,%rdi 15: 48 c7 c6 a0 61 ca 8b mov $0xffffffff8bca61a0,%rsi 1c: 48 c7 c2 20 67 ca 8b mov $0xffffffff8bca6720,%rdx 23: 8b 0c 24 mov (%rsp),%ecx 26: 4d 89 f8 mov %r15,%r8 29: 50 push %rax * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 48 83 c4 08 add $0x8,%rsp 33: 4c 8b 6c 24 18 mov 0x18(%rsp),%r13 38: 48 rex.W 39: b9 00 00 00 00 mov $0x0,%ecx 3e: 00 fc add %bh,%ah --- 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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