From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f197.google.com (mail-oi1-f197.google.com [209.85.167.197]) (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 26BA5431499 for ; Thu, 13 Aug 2026 20:45:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.197 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786653931; cv=none; b=bQOB9mONUywnzXvCcDCyYAHyo1o5bdB+w6BBGT+JkX6ALryekWj0tVzDMF5DIA9oW/t1sXGbyN2of6VtQpL88vb5YEAMbx8qGE+u4697dGGN081QsAPTGKYamS219Q/8FGymh5+S/Xzx/bEhjtSLQc7xdZhMurWvACZ2DxvM66A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786653931; c=relaxed/simple; bh=N/AW2reRD7JsMbYnRLf9ATDO8Eihv2fo2QSV3wTsXdw=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=piZrhj6IDJwzqWRSu3LVJ6cVW/3JwnagMbpb6hP4JTX6q5zo5EBvRcEUZSBLUvU87z1Kbp97bj3JCSqNQ7gzJya803ut9mhznyuAH69dSyfgVSNJ4C7rdbs2rZUUPUy7QNXIhyWI8jCbLwJsDOqtWo84DLvx8+67+gKSwO+KIfk= 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=209.85.167.197 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-oi1-f197.google.com with SMTP id 5614622812f47-4a416619e8dso324694b6e.1 for ; Thu, 13 Aug 2026 13:45:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786653929; x=1787258729; 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=5FtPTtbEsyQJuUK1znFMkO8DRuHfCG8quW5cpC+wZn4=; b=DftCoWx4YgwQHx3z6kk5XU/JPQEvF2kF24pFw8RXxIJms6JmXiS4H+Z1Zvbw0rVGX0 WVaIkdh74pVz3DayNnkhAnJZ591UWsdPci7k3WEU8kvgXDVRhK/d+RgW5RsgBoiugfu6 oaarXqFUTdoH/+dgIkOP8cZWAXwWFHmZ7C+1CfG54Cop6xKe4Di31HFycI+gaFVnRUVu PSF54BB4agJLOyAeypemEDDEYYbUXN5XjOQssM4MHaG21oKCLMzeJR9ORrYUDNfn0QTC prqZT8sOTBdiIxdT2bfTitr84YREeV/KN/hSWe0YxAq77Y+/+kMHREof+258QOgks06/ X3KQ== X-Gm-Message-State: AOJu0YycyGrJtrGlyuGdSzAcnHr3FtSYL79w4LYAX8xz34FzkEF4PSAX RajZos5m2PiZmThjCqiB/1JKfMbP0mdvwRRefdHu066mqZUdrZ+nlWPST3E/PvhLMk1LgsYkX7T ++935/eCrxCR1TM4P0m2Ux1iZG6eqr5ZT2RtyKvhDVVflnwGHTEOmbB8VgBw= 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:f8d:b0:4a4:66f8:1275 with SMTP id 5614622812f47-4b2283187d7mr6531642b6e.14.1786653928863; Thu, 13 Aug 2026 13:45:28 -0700 (PDT) Date: Thu, 13 Aug 2026 13:45:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a7e2ce8.f70deec7.2acc03.000c.GAE@google.com> Subject: [syzbot] [kernel?] WARNING: kobject bug in goku_remove From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 3aa1dcaa4f6f Revert "wifi: mt76: Disable napi when removin.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11e09c79580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c44651ea7dd2f307 dashboard link: https://syzkaller.appspot.com/bug?extid=06ec7624018233e17113 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=160e4ac6580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+06ec7624018233e17113@syzkaller.appspotmail.com usb usb3: USB disconnect, device number 1 uhci_hcd 0000:00:1d.1: USB bus 3 deregistered ------------[ cut here ]------------ kobject: '(null)' (ffff8880281480d8): is not initialized, yet kobject_put() is being called. WARNING: lib/kobject.c:734 at kobject_put+0x252/0x640 lib/kobject.c:734, CPU#2: syz-executor405/6027 Modules linked in: CPU: 2 UID: 0 PID: 6027 Comm: syz-executor405 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:kobject_put+0x258/0x640 lib/kobject.c:734 Code: 59 f6 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 5e 03 00 00 48 8d 3d 9e 2d 83 05 48 8b 33 48 89 da <67> 48 0f b9 3a e9 0b fe ff ff e8 b9 88 59 f6 be 03 00 00 00 4c 89 RSP: 0018:ffffc90003437728 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8880281480d8 RCX: ffffffff8bb0e8c4 RDX: ffff8880281480d8 RSI: 0000000000000000 RDI: ffffffff91341850 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888028148114 R13: dffffc0000000000 R14: ffff888028148834 R15: 0000000000000000 FS: 0000555585cdf400(0000) GS:ffff8880d5fe9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe6f14cda8 CR3: 0000000055370000 CR4: 0000000000352ef0 Call Trace: put_device+0x1f/0x30 drivers/base/core.c:3880 goku_remove+0x47/0x470 drivers/usb/gadget/udc/goku_udc.c:1717 goku_probe+0x2f6/0x3c0 drivers/usb/gadget/udc/goku_udc.c:1830 local_pci_probe+0xdd/0x1b0 drivers/pci/pci-driver.c:332 pci_call_probe+0x176/0x800 drivers/pci/pci-driver.c:394 __pci_device_probe drivers/pci/pci-driver.c:455 [inline] pci_device_probe+0x1cd/0x370 drivers/pci/pci-driver.c:489 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:706 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898 __driver_attach+0x21f/0x5b0 drivers/base/dd.c:1292 bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:383 pci_add_dynid+0x2b5/0x370 drivers/pci/pci-driver.c:77 new_id_store+0x2a9/0x5b0 drivers/pci/pci-driver.c:249 drv_attr_store+0x74/0xb0 drivers/base/bus.c:125 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6ac/0x1050 fs/read_write.c:687 ksys_write+0x12a/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f370300ce37 Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007fff6fddcbc0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000555585cdf400 RCX: 00007f370300ce37 RDX: 000000000000000d RSI: 00007fff6fddcc80 RDI: 0000000000000003 RBP: 00007fff6fddd400 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003 R13: 00007fff6fddcf20 R14: 00007fff6fddcd00 R15: 000000000000000a ---------------- Code disassembly (best guess): 0: 59 pop %rcx 1: f6 48 89 da testb $0xda,-0x77(%rax) 5: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax c: fc ff df f: 48 c1 ea 03 shr $0x3,%rdx 13: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 17: 0f 85 5e 03 00 00 jne 0x37b 1d: 48 8d 3d 9e 2d 83 05 lea 0x5832d9e(%rip),%rdi # 0x5832dc2 24: 48 8b 33 mov (%rbx),%rsi 27: 48 89 da mov %rbx,%rdx * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 0b fe ff ff jmp 0xfffffe3f 34: e8 b9 88 59 f6 call 0xf65988f2 39: be 03 00 00 00 mov $0x3,%esi 3e: 4c rex.WR 3f: 89 .byte 0x89 --- 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