From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f69.google.com (mail-oo1-f69.google.com [209.85.161.69]) (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 E41273203B6 for ; Sat, 7 Mar 2026 23:59:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.69 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772927972; cv=none; b=EY2ZY2kYBAPIYNB5W/Ei3HlSaDPYcf1Kgul6YUzd60YdPimUEQ16WqtXDEUWUOHg1uvZU7KY9E516Su5sWZnYO+YJoB4+DgojtvFtLuXTakTiEiu9Q8ELiFQwNIX4+Z5sMaFPf2azCK/sBJpZ2cWYiquSUhEn8DD2w8ES8ehR2Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772927972; c=relaxed/simple; bh=qbTT0jw2UstrhbuoFzuqIFkLYKYNRPlNSIbRiM67570=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; 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006d021491bc7-67baf794efemr86249eaf.40.1772927969970; Sat, 07 Mar 2026 15:59:29 -0800 (PST) Date: Sat, 07 Mar 2026 15:59:29 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69acbbe1.050a0220.310d8.0001.GAE@google.com> Subject: [syzbot] [sound?] general protection fault in snd_scarlett2_controls_create From: syzbot To: g@b4.vu, linux-kernel@vger.kernel.org, linux-sound@vger.kernel.org, perex@perex.cz, syzkaller-bugs@googlegroups.com, tiwai@suse.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: c025f6cf4209 Add linux-next specific files for 20260303 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1347bb5a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=54b410fabe2a4318 dashboard link: https://syzkaller.appspot.com/bug?extid=8f29539ef9a1c8334f42 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12242b5a580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=143f1b5a580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e2497bde352d/disk-c025f6cf.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/36827cb45429/vmlinux-c025f6cf.xz kernel image: https://storage.googleapis.com/syzbot-assets/7ebf1ed6bb73/bzImage-c025f6cf.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8f29539ef9a1c8334f42@syzkaller.appspotmail.com usb 1-1: 0:6 : does not exist usb 1-1: 0:7 : does not exist usb 1-1: 0:8 : does not exist usb 1-1: 0:9 : does not exist usb 1-1: 0:10 : does not exist usb 1-1: Focusrite Scarlett Gen 3 Mixer Driver enabled (pid=0x8215); report any issues to https://github.com/geoffreybennett/scarlett-gen2/issues Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 1215 Comm: kworker/0:3 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: usb_hub_wq hub_event RIP: 0010:usb_endpoint_num include/uapi/linux/usb/ch9.h:479 [inline] RIP: 0010:scarlett2_find_fc_interface sound/usb/mixer_scarlett2.c:8257 [inline] RIP: 0010:scarlett2_init_private sound/usb/mixer_scarlett2.c:8291 [inline] RIP: 0010:snd_scarlett2_controls_create+0x998/0x4f70 sound/usb/mixer_scarlett2.c:8680 Code: 10 4c 8d b2 48 02 00 00 4c 89 f0 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 ea 31 00 00 45 88 3e 4c 8d 73 02 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 48 8b 7c 24 38 0f 85 ea 31 00 00 45 0f b6 3e RSP: 0018:ffffc90005abe4c0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888076018000 RSI: 00000000000000ff RDI: ffff888027a637a0 RBP: ffffc90005abe8d8 R08: ffffffff8cd90234 R09: ffffffff8cd90248 R10: dffffc0000000000 R11: fffffbfff20684b7 R12: dffffc0000000000 R13: ffff888027a6378a R14: 0000000000000002 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888124ff5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005603857c86e0 CR3: 0000000035240000 CR4: 00000000003526f0 Call Trace: snd_scarlett2_init+0x42f/0x6a0 sound/usb/mixer_scarlett2.c:9403 snd_usb_mixer_apply_create_quirk+0x15a8/0x1be0 sound/usb/mixer_quirks.c:4446 snd_usb_create_mixer+0x1b5d/0x2890 sound/usb/mixer.c:3641 usb_audio_probe+0x1874/0x2330 sound/usb/card.c:1033 usb_probe_interface+0x668/0xc90 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x267/0xaf0 drivers/base/dd.c:661 __driver_probe_device+0x18c/0x320 drivers/base/dd.c:803 driver_probe_device+0x4f/0x240 drivers/base/dd.c:833 __device_attach_driver+0x2d4/0x4c0 drivers/base/dd.c:961 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c5/0x450 drivers/base/dd.c:1033 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1088 bus_probe_device+0x12a/0x220 drivers/base/bus.c:574 device_add+0x7b6/0xb70 drivers/base/core.c:3689 usb_set_configuration+0x1a87/0x2110 drivers/usb/core/message.c:2208 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250 usb_probe_device+0x1c4/0x3b0 drivers/usb/core/driver.c:291 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x267/0xaf0 drivers/base/dd.c:661 __driver_probe_device+0x18c/0x320 drivers/base/dd.c:803 driver_probe_device+0x4f/0x240 drivers/base/dd.c:833 __device_attach_driver+0x2d4/0x4c0 drivers/base/dd.c:961 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c5/0x450 drivers/base/dd.c:1033 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1088 bus_probe_device+0x12a/0x220 drivers/base/bus.c:574 device_add+0x7b6/0xb70 drivers/base/core.c:3689 usb_new_device+0xa08/0x16f0 drivers/usb/core/hub.c:2695 hub_port_connect drivers/usb/core/hub.c:5567 [inline] hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] port_event drivers/usb/core/hub.c:5871 [inline] hub_event+0x2a1c/0x4f30 drivers/usb/core/hub.c:5953 process_one_work+0x963/0x1720 kernel/workqueue.c:3285 process_scheduled_works kernel/workqueue.c:3376 [inline] worker_thread+0xb46/0x1140 kernel/workqueue.c:3457 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 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:usb_endpoint_num include/uapi/linux/usb/ch9.h:479 [inline] RIP: 0010:scarlett2_find_fc_interface sound/usb/mixer_scarlett2.c:8257 [inline] RIP: 0010:scarlett2_init_private sound/usb/mixer_scarlett2.c:8291 [inline] RIP: 0010:snd_scarlett2_controls_create+0x998/0x4f70 sound/usb/mixer_scarlett2.c:8680 Code: 10 4c 8d b2 48 02 00 00 4c 89 f0 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 ea 31 00 00 45 88 3e 4c 8d 73 02 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 48 8b 7c 24 38 0f 85 ea 31 00 00 45 0f b6 3e RSP: 0018:ffffc90005abe4c0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888076018000 RSI: 00000000000000ff RDI: ffff888027a637a0 RBP: ffffc90005abe8d8 R08: ffffffff8cd90234 R09: ffffffff8cd90248 R10: dffffc0000000000 R11: fffffbfff20684b7 R12: dffffc0000000000 R13: ffff888027a6378a R14: 0000000000000002 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888124ff5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005603857c86e0 CR3: 0000000076b5e000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 10 4c 8d b2 adc %cl,-0x4e(%rbp,%rcx,4) 4: 48 02 00 rex.W add (%rax),%al 7: 00 4c 89 f0 add %cl,-0x10(%rcx,%rcx,4) b: 48 c1 e8 03 shr $0x3,%rax f: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax 14: 84 c0 test %al,%al 16: 0f 85 ea 31 00 00 jne 0x3206 1c: 45 88 3e mov %r15b,(%r14) 1f: 4c 8d 73 02 lea 0x2(%rbx),%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 48 8b 7c 24 38 mov 0x38(%rsp),%rdi 36: 0f 85 ea 31 00 00 jne 0x3226 3c: 45 0f b6 3e movzbl (%r14),%r15d --- 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