From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f206.google.com (mail-oi1-f206.google.com [209.85.167.206]) (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 32257E56A for ; Sun, 2 Aug 2026 00:01:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.206 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785628892; cv=none; b=QGnmR7ONcRxsn9y3f1jLHLPD7PRthWObrr64Sd7Qpi9KByNhePBtp41hfepl889xdW+jzRhxV67S4or3KbzpqeY7fWKFo5pfs0Sz+u4pTmKCQ4OsDDW5fHgWG8H2Ldf06bU1DWyHT+UvtXozPTjpCu6YDc//pplpVwRPJ8eWefE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785628892; c=relaxed/simple; bh=NAlkJTudrLZwGNmzFqmZnWGv+foHmaS64jirWct96HQ=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=Avbkq7cnYJ/Ux3gahznb/AY7yhp2iY7Am3g27OHgHqM5226B/tH2rAvw4gL0urdexO5ZLvnaEoYOgA+n5powJwQmp0q2CgdSreopVFGP36RNCFu1VD3Pt4K4y7EpVhq9T7pxCCwHQ8C0QXdadKVY7sLCYow7CJseUUu2G8VwJ1A= 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=209.85.167.206 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-f206.google.com with SMTP id 5614622812f47-4a45b3f0bdfso2765476b6e.1 for ; Sat, 01 Aug 2026 17:01:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785628890; x=1786233690; 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=obaBbdwQOTPGq5oO8I7zmX6YNpGFQMgr16pxSKpEU1c=; b=hrwTVg7WYsf0gfY3coPu5zD/0C4BkxMNnA+MKH0g9mT5GvLGi1DvjQa3XKQzP9ziM0 pVutFTvLCZUPk96YMUmE7RMRQx3+xpAMuPocC3MVzJNHSDJ1RyQjI8YOCAfhn+Ak/9Mo PBPMI8sDzdk9tOVivKCCxVzOJheoLy1WxI/5TOvBqQ/rvdvs5Dyi7TCv5MYcLrOf9oxJ G4Xsiux11Z0SoU8aAKX8mEMB4pWyg5xGQUzoQJBrlgGTXeHPcsSQi8OHiRXrTyKeB+nd Y0vf83jT3BQzfoooAsFpdzCDVI7XyfKlFP9NQdIum1ZCfjxdp8qF/9M0w5fpGBOJQY9e Oqlw== X-Forwarded-Encrypted: i=1; AHgh+RobLP1XhhQao1xqghbemoslFfXzpd9KGV1Sho+OspiRR2TTh7PHL7X38yFphOOYjSoIQNE90z8Nw4w=@vger.kernel.org X-Gm-Message-State: AOJu0Yz9kvdjEhZQnUZkVy8RvOZKoeHXZM/aZpSwGOAJHapyxpbHjsjF x7QLoZ0vsMX9oq+0WS2IyppMFcLzVbMmZ+9eGUAjLbJd4P7ZU4qhY5PGuef79iG554Yz+yvjTqx 78uq1Xb9J4GnlEMHIJd01eQ1KWKIsZhPLkoBbyl4ZX8PR4WMzijvvS7AzNF8= Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:c1fa:b0:48b:1e49:24a8 with SMTP id 5614622812f47-4af5e337ed2mr9422805b6e.11.1785628890179; Sat, 01 Aug 2026 17:01:30 -0700 (PDT) Date: Sat, 01 Aug 2026 17:01:30 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a6e88da.13bfb6d0.1ecdd5.0268.GAE@google.com> Subject: [syzbot] [usb?] general protection fault in dummy_udc_stop From: syzbot To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 48a5a7ab8d6a Merge tag 'v7.2-rc4-smb3-client-fixes' of git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=138cdca9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782 dashboard link: https://syzkaller.appspot.com/bug?extid=366177ceada8026bb3a6 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1eb5b7aa9ec5/disk-48a5a7ab.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/965506e050aa/vmlinux-48a5a7ab.xz kernel image: https://storage.googleapis.com/syzbot-assets/662778208054/bzImage-48a5a7ab.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+366177ceada8026bb3a6@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 14439 Comm: syz.7.1882 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:dummy_udc_stop+0x9b/0x450 drivers/usb/gadget/udc/dummy_hcd.c:1035 Code: c1 ea 03 80 3c 02 00 0f 85 b8 03 00 00 48 8b 9b 90 06 00 00 e8 86 62 39 fa 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 84 03 00 00 4c 8b 2b 4c 89 ef e8 70 c9 ec 03 49 RSP: 0018:ffffc900037bfad0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87d0f9de RDX: 0000000000000000 RSI: ffffffff87d0fa1a RDI: ffff8880288ad290 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000005 R10: 0000000000000003 R11: 0000000000002260 R12: ffff888038dba438 R13: ffff88802b8d5540 R14: ffff8880288acc00 R15: ffffffff8cb7c8e0 FS: 00007fe5286926c0(0000) GS:ffff888123dde000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b3480afe8 CR3: 000000004c226000 CR4: 00000000003526f0 Call Trace: usb_gadget_udc_stop_locked drivers/usb/gadget/udc/core.c:1265 [inline] gadget_unbind_driver+0x2ca/0x4f0 drivers/usb/gadget/udc/core.c:1727 device_remove+0xcb/0x180 drivers/base/dd.c:616 __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372 driver_detach+0xd8/0x1b0 drivers/base/dd.c:1435 bus_remove_driver+0x13b/0x2e0 drivers/base/bus.c:832 driver_unregister+0x76/0xb0 drivers/base/driver.c:202 usb_gadget_unregister_driver+0x49/0x70 drivers/usb/gadget/udc/core.c:1784 unregister_gadget drivers/usb/gadget/configfs.c:263 [inline] gadget_dev_desc_UDC_store+0x170/0x2e0 drivers/usb/gadget/configfs.c:290 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x302/0x4e0 fs/configfs/file.c:229 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: 0033:0x7fe52779de99 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:00007fe528692028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fe527a25fa0 RCX: 00007fe52779de99 RDX: 0000000000000001 RSI: 00002000000004c0 RDI: 0000000000000004 RBP: 00007fe527833eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe527a26038 R14: 00007fe527a25fa0 R15: 00007ffc5d1d0288 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:dummy_udc_stop+0x9b/0x450 drivers/usb/gadget/udc/dummy_hcd.c:1035 Code: c1 ea 03 80 3c 02 00 0f 85 b8 03 00 00 48 8b 9b 90 06 00 00 e8 86 62 39 fa 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 84 03 00 00 4c 8b 2b 4c 89 ef e8 70 c9 ec 03 49 RSP: 0018:ffffc900037bfad0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87d0f9de RDX: 0000000000000000 RSI: ffffffff87d0fa1a RDI: ffff8880288ad290 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000005 R10: 0000000000000003 R11: 0000000000002260 R12: ffff888038dba438 R13: ffff88802b8d5540 R14: ffff8880288acc00 R15: ffffffff8cb7c8e0 FS: 00007fe5286926c0(0000) GS:ffff888123ede000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000035a030 CR3: 000000004c226000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: c1 ea 03 shr $0x3,%edx 3: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 7: 0f 85 b8 03 00 00 jne 0x3c5 d: 48 8b 9b 90 06 00 00 mov 0x690(%rbx),%rbx 14: e8 86 62 39 fa call 0xfa39629f 19: 48 89 da mov %rbx,%rdx 1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 23: fc ff df 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 84 03 00 00 jne 0x3b8 34: 4c 8b 2b mov (%rbx),%r13 37: 4c 89 ef mov %r13,%rdi 3a: e8 70 c9 ec 03 call 0x3ecc9af 3f: 49 rex.WB --- 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