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AHgh+RpugIloCtY9ISWmnt47joXZ1L3mMcoSL9ltjmZyKhfF4zUDQafSTkYdbIN/O2YIttbDqldBJHjxKB54m4s=@vger.kernel.org X-Gm-Message-State: AFuF++nFSpj2hQj/+LD29Xp8RP6sUmW5STTRpqNT7EXSvPsOZB8e+NZB 3dtUO7iN/Gu6IOS6Gfo96ZwlMdsSyxLgE3UKZ/OxIu272YIVJsIGGQpu8fSfQd+46nDdR+raN06 zhCbX1rTW0m12dXkyKbmvaMdgwPzZsQuKNBJNTKvlOKsTgm/jBpi4Wt/51RM= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:6c82:b0:4b2:9d0d:ffa with SMTP id 5614622812f47-4b2eef530c3mr25232470b6e.0.1787549738532; Sun, 23 Aug 2026 22:35:38 -0700 (PDT) Date: Sun, 23 Aug 2026 22:35:38 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a8bd82a.dbb3a75c.13dd47.0061.GAE@google.com> Subject: [syzbot] [usb-storage?] divide error in alauda_transport From: syzbot To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, stern@rowland.harvard.edu, syzkaller-bugs@googlegroups.com, usb-storage@lists.one-eyed-alien.net Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 7f063b2f17ea Merge tag 'for_linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13d23e79580000 kernel config: https://syzkaller.appspot.com/x/.config?x=202110c0ee6856a6 dashboard link: https://syzkaller.appspot.com/bug?extid=dc208a8cf8d37cf3e5ac compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16c3e549580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/8ee85add2a67/disk-7f063b2f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2d02bce810bb/vmlinux-7f063b2f.xz kernel image: https://storage.googleapis.com/syzbot-assets/12151938fa51/bzImage-7f063b2f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+dc208a8cf8d37cf3e5ac@syzkaller.appspotmail.com Oops: divide error: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 5915 Comm: usb-storage Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:alauda_read_data drivers/usb/storage/alauda.c:954 [inline] RIP: 0010:alauda_transport+0xbd6/0x43a0 drivers/usb/storage/alauda.c:1187 Code: 24 70 e8 2d e9 2e fa 41 0f b7 c4 0f b7 cb 89 8c 24 e0 00 00 00 48 8b 5c 24 40 4c 8b 74 24 28 45 89 fc 41 89 c7 44 89 f8 31 d2 b4 24 e8 00 00 00 89 54 24 50 41 89 c5 48 89 df 89 c6 e8 52 61 RSP: 0018:ffffc9000249f860 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88807ff3ce90 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020 RBP: ffffc9000249faf0 R08: ffff888026289f40 R09: 0000000000000004 R10: 00000000ffffffe0 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: ffff88807ff3d258 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125014000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f67dcda4 CR3: 0000000070670000 CR4: 00000000003526f0 Call Trace: usb_stor_invoke_transport+0x115/0x1a40 drivers/usb/storage/transport.c:611 usb_stor_control_thread+0x44c/0x8f0 drivers/usb/storage/usb.c:462 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 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:alauda_read_data drivers/usb/storage/alauda.c:954 [inline] RIP: 0010:alauda_transport+0xbd6/0x43a0 drivers/usb/storage/alauda.c:1187 Code: 24 70 e8 2d e9 2e fa 41 0f b7 c4 0f b7 cb 89 8c 24 e0 00 00 00 48 8b 5c 24 40 4c 8b 74 24 28 45 89 fc 41 89 c7 44 89 f8 31 d2 b4 24 e8 00 00 00 89 54 24 50 41 89 c5 48 89 df 89 c6 e8 52 61 RSP: 0018:ffffc9000249f860 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88807ff3ce90 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020 RBP: ffffc9000249faf0 R08: ffff888026289f40 R09: 0000000000000004 R10: 00000000ffffffe0 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: ffff88807ff3d258 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888124f14000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1b845212c0 CR3: 0000000072220000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 24 70 and $0x70,%al 2: e8 2d e9 2e fa call 0xfa2ee934 7: 41 0f b7 c4 movzwl %r12w,%eax b: 0f b7 cb movzwl %bx,%ecx e: 89 8c 24 e0 00 00 00 mov %ecx,0xe0(%rsp) 15: 48 8b 5c 24 40 mov 0x40(%rsp),%rbx 1a: 4c 8b 74 24 28 mov 0x28(%rsp),%r14 1f: 45 89 fc mov %r15d,%r12d 22: 41 89 c7 mov %eax,%r15d 25: 44 89 f8 mov %r15d,%eax 28: 31 d2 xor %edx,%edx * 2a: f7 b4 24 e8 00 00 00 divl 0xe8(%rsp) <-- trapping instruction 31: 89 54 24 50 mov %edx,0x50(%rsp) 35: 41 89 c5 mov %eax,%r13d 38: 48 89 df mov %rbx,%rdi 3b: 89 c6 mov %eax,%esi 3d: e8 .byte 0xe8 3e: 52 push %rdx 3f: 61 (bad) --- 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