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Mon, 17 Aug 2026 04:04:37 -0700 (PDT) Date: Mon, 17 Aug 2026 04:04:37 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a82eac5.dbb3a75c.20434b.0055.GAE@google.com> Subject: [syzbot] WARNING in usb_composite_setup_continue 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: 3d6d817622b0 Merge tag 'scsi-fixes' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1053f479580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c44651ea7dd2f307 dashboard link: https://syzkaller.appspot.com/bug?extid=a83a5a1ba9ff57935171 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=16415149580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a83a5a1ba9ff57935171@syzkaller.appspotmail.com ------------[ cut here ]------------ usb_composite_setup_continue: Unexpected call WARNING: drivers/usb/gadget/composite.c:2743 at usb_composite_setup_continue+0x2be/0x3a0 drivers/usb/gadget/composite.c:2743, CPU#1: file-storage/5932 Modules linked in: CPU: 1 UID: 0 PID: 5932 Comm: file-storage Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:usb_composite_setup_continue+0x2c5/0x3a0 drivers/usb/gadget/composite.c:2743 Code: e5 40 89 ee e8 7c fa 3d fa 40 84 ed 0f 84 35 fe ff ff e9 ec 74 87 f9 e8 59 00 3e fa 48 8d 3d c2 b9 62 09 48 c7 c6 a0 27 b7 8c <67> 48 0f b9 3a e9 d6 fd ff ff e8 3c 00 3e fa 48 89 da 48 b8 00 00 RSP: 0018:ffffc9000204fc88 EFLAGS: 00010093 RAX: 0000000000000000 RBX: ffff888021bce528 RCX: ffffffff87cc7103 RDX: ffff888079b50000 RSI: ffffffff8cb727a0 RDI: ffffffff912f2cf0 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000293 R13: ffff888021bce6c8 R14: ffff88801e31c610 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888123eec000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4279cc4ff8 CR3: 000000007215b000 CR4: 00000000003526f0 Call Trace: handle_exception drivers/usb/gadget/function/f_mass_storage.c:2551 [inline] fsg_main_thread+0x16ec/0x88e0 drivers/usb/gadget/function/f_mass_storage.c:2589 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: e5 40 in $0x40,%eax 2: 89 ee mov %ebp,%esi 4: e8 7c fa 3d fa call 0xfa3dfa85 9: 40 84 ed test %bpl,%bpl c: 0f 84 35 fe ff ff je 0xfffffe47 12: e9 ec 74 87 f9 jmp 0xf9877503 17: e8 59 00 3e fa call 0xfa3e0075 1c: 48 8d 3d c2 b9 62 09 lea 0x962b9c2(%rip),%rdi # 0x962b9e5 23: 48 c7 c6 a0 27 b7 8c mov $0xffffffff8cb727a0,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 d6 fd ff ff jmp 0xfffffe0a 34: e8 3c 00 3e fa call 0xfa3e0075 39: 48 89 da mov %rbx,%rdx 3c: 48 rex.W 3d: b8 .byte 0xb8 --- 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