From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f208.google.com (mail-oi1-f208.google.com [209.85.167.208]) (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 B1FF6279798 for ; Tue, 11 Aug 2026 12:53:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786452808; cv=none; b=TtzlK3t283Vam/fuBWmAAioKJtRKAO/g2ow+/YGuPhoZI/goQz1XPqKGxf0YeT3m+QPqtqdHROeNaTl4D+rEBEVkIe6yOUKSwMG5GeGuWyXLCv8OcH3A++kqyHVKp9Ue0qZCTdox0XGFv9p1BRmfYF94l98jHtdE7nNy1DhSVkc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786452808; c=relaxed/simple; bh=XFWIHy6QuGQ5UtkZD5i86rs2cCXDOIRIBawqKDnYW8Q=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=ACvaqoJ8NGkhVDcbs24fdCFQhM/x9rHo8gBeBiHnyd0fZ9QKVjGrLPRtvzpnb+AHAJHg1cwLVvI75jepjG5bPXwwUceTm1FDTl4dOiiyjdYUeAViBEhcnn9mvf7ibT/JRk1XoqrBq1b/hBlx8x/fhZNn62LVO4AZg17S2V+K3Rc= 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=209.85.167.208 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-f208.google.com with SMTP id 5614622812f47-485ebc5706cso1304060b6e.0 for ; Tue, 11 Aug 2026 05:53:26 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786452805; x=1787057605; 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=noChZkT7g51Z3CosKUKVV3G5GIKROqkR3T7nJW+r8UI=; b=s5Uh/S6QiosZ3ZquJvOBEREpnxy749lxc2lCW7PRyZG0oM1m3aNr+jZzfFDAURrlri 3+DK2/jn0yPjPWsrreo96Xma+sZ8oyMpdf7prmuJ+8EHCA9FZtoxt6QdD283xhwdzyE0 6e3MygkgIpILAQcP9uTfcEXhruS54ommKkcl5P6UHdBwQaJpNtttW1kwNvjgf7FQhwbo 9mTQLA1OBJYlyrdn0CZscYPkztjoz8bQJAgbkyMhsvS7Ow4Tf3P57R3oj+sxLGIGA8L/ KCN4py4XAIqdSsBCVO7gZaSjDlkLhwjJKFQQjrhgYAvIjtZqkERPxEAond/GlfgrIugO qQPQ== X-Forwarded-Encrypted: i=1; AHgh+RpwSDZxdfF9fRz4n1O9td89tlzC4pBRnR9pDrk2foCydCL7PD74IDtOuGGCT5QHkvGt358+4eIbDJGmnUY=@vger.kernel.org X-Gm-Message-State: AOJu0YwKkTJpylojqz2AeH9Nkga5SXF0W09cn+3uSOUrtSYnhS9a+ujl /m9ZhQ31zuNaJDAGMJfxpymXqbechWb2tXWOU8CC8fBCQua+nflXhsMM5X+Y0DKyi85kGPW1x52 WFsYPr2MqgpZsjUejnruroCwrSLtU6gKM3DKwcSQTr0bgnwxG/OieBo5/jJQ= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1314:b0:492:7abc:422e with SMTP id 5614622812f47-4b1fe85793emr1900814b6e.13.1786452805630; Tue, 11 Aug 2026 05:53:25 -0700 (PDT) Date: Tue, 11 Aug 2026 05:53:25 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a7b1b45.9c11d2ce.289b96.0106.GAE@google.com> Subject: [syzbot] [usb?] WARNING: kobject bug in pch_udc_remove From: syzbot To: dakr@kernel.org, driver-core@lists.linux.dev, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, rafael@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: d58772d8520c Merge tag 'regmap-fix-v7.2-rc7' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10996149580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c44651ea7dd2f307 dashboard link: https://syzkaller.appspot.com/bug?extid=3e2e533aa1b2a75525e7 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17bc2a9e580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17293132580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-d58772d8.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/caffbd0a7ec1/vmlinux-d58772d8.xz kernel image: https://storage.googleapis.com/syzbot-assets/686d959b6f96/bzImage-d58772d8.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3e2e533aa1b2a75525e7@syzkaller.appspotmail.com pch_udc 0000:00:03.0: pch_udc_probe: request_irq(23) fail ------------[ cut here ]------------ kobject: '(null)' (ffff888035ce0110): is not initialized, yet kobject_put() is being called. WARNING: lib/kobject.c:734 at kobject_put+0x252/0x640 lib/kobject.c:734, CPU#0: syz.0.17/5908 Modules linked in: CPU: 0 UID: 0 PID: 5908 Comm: syz.0.17 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 de 47 83 05 48 8b 33 48 89 da <67> 48 0f b9 3a e9 0b fe ff ff e8 b9 a8 59 f6 be 03 00 00 00 4c 89 RSP: 0018:ffffc900035b7918 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff888035ce0110 RCX: ffffffff8bb0c8c4 RDX: ffff888035ce0110 RSI: 0000000000000000 RDI: ffffffff91341290 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888035ce014c R13: dffffc0000000000 R14: ffff888035ce1978 R15: ffff888035ce0608 FS: 000055558de32500(0000) GS:ffff8880d5dec000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557c252125d8 CR3: 0000000040736000 CR4: 0000000000352ef0 Call Trace: put_device+0x1f/0x30 drivers/base/core.c:3880 pch_udc_remove+0x47/0x510 drivers/usb/gadget/udc/pch_udc.c:2986 pch_udc_probe+0xcc6/0x1130 drivers/usb/gadget/udc/pch_udc.c:3109 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 device_driver_attach+0xd1/0x220 drivers/base/dd.c:1203 bind_store+0xf4/0x190 drivers/base/bus.c:267 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: 0033:0x7f60b4b9e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdce022f28 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f60b4e25fa0 RCX: 00007f60b4b9e0d9 RDX: 000000000000000d RSI: 0000200000000240 RDI: 0000000000000005 RBP: 00007ffdce022f90 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007f60b4e25fac R14: 00007f60b4e25fa0 R15: 00007f60b4e25fa0 ---------------- 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 de 47 83 05 lea 0x58347de(%rip),%rdi # 0x5834802 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 a8 59 f6 call 0xf659a8f2 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