usb 3-1: 1:1 : UAC_AS_GENERAL descriptor not found
usb 3-1: unit 5 not found!
usb 3-1: Focusrite Scarlett Gen 3 Mixer Driver enabled (pid=0x8214); report any issues to g@b4.vu
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 24 Comm: kworker/1:0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:scarlett2_find_fc_interface sound/usb/mixer_scarlett2.c:3904 [inline]
RIP: 0010:scarlett2_init_private sound/usb/mixer_scarlett2.c:3938 [inline]
RIP: 0010:snd_scarlett2_controls_create+0x793/0x3ea0 sound/usb/mixer_scarlett2.c:4275
Code: 08 48 8d 9f 00 01 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 9b 31 00 00 44 88 33 49 8d 5f 02 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 9f 31 00 00 44 0f b6 33 41 80 e6 0f 48
RSP: 0018:ffffc90000196520 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000000
RDX: ffff88810033e540 RSI: 00000000000000ff RDI: ffff888115925000
RBP: ffffc90000196880 R08: 0000000000000000 R09: ffff888115925058
R10: dffffc0000000000 R11: ffffed1022b24a0d R12: dffffc0000000000
R13: fffff52000032cb8 R14: 0000000000000002 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7661b85980 CR3: 000000010f373000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
snd_scarlett2_init+0x1d4/0x360 sound/usb/mixer_scarlett2.c:4395
snd_usb_mixer_apply_create_quirk+0x190e/0x2b40 sound/usb/mixer_quirks.c:3724
snd_usb_create_mixer+0x1a3a/0x2600 sound/usb/mixer.c:3637
usb_audio_probe+0x1349/0x1da0 sound/usb/card.c:949
usb_probe_interface+0x63f/0xb20 drivers/usb/core/driver.c:397
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2cb/0x960 drivers/base/dd.c:639
__driver_probe_device+0x198/0x280 drivers/base/dd.c:808
driver_probe_device+0x54/0x3e0 drivers/base/dd.c:838
__device_attach_driver+0x2e9/0x4a0 drivers/base/dd.c:966
bus_for_each_drv+0x192/0x220 drivers/base/bus.c:429
__device_attach+0x2b0/0x420 drivers/base/dd.c:1038
device_initial_probe+0x1a/0x20 drivers/base/dd.c:1087
bus_probe_device+0xc0/0x1f0 drivers/base/bus.c:489
device_add+0xb4d/0xef0 drivers/base/core.c:3698
usb_set_configuration+0x19c2/0x1f10 drivers/usb/core/message.c:2165
usb_generic_driver_probe+0x91/0x150 drivers/usb/core/generic.c:238
usb_probe_device+0x159/0x270 drivers/usb/core/driver.c:294
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x2cb/0x960 drivers/base/dd.c:639
__driver_probe_device+0x198/0x280 drivers/base/dd.c:808
driver_probe_device+0x54/0x3e0 drivers/base/dd.c:838
__device_attach_driver+0x2e9/0x4a0 drivers/base/dd.c:966
bus_for_each_drv+0x192/0x220 drivers/base/bus.c:429
__device_attach+0x2b0/0x420 drivers/base/dd.c:1038
device_initial_probe+0x1a/0x20 drivers/base/dd.c:1087
bus_probe_device+0xc0/0x1f0 drivers/base/bus.c:489
device_add+0xb4d/0xef0 drivers/base/core.c:3698
usb_new_device+0xa81/0x1550 drivers/usb/core/hub.c:2684
hub_port_connect drivers/usb/core/hub.c:5594 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5734 [inline]
port_event drivers/usb/core/hub.c:5898 [inline]
hub_event+0x2aca/0x46b0 drivers/usb/core/hub.c:5980
process_one_work+0x71f/0xc40 kernel/workqueue.c:2302
worker_thread+0xa29/0x11e0 kernel/workqueue.c:2449
kthread+0x281/0x320 kernel/kthread.c:386
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:scarlett2_find_fc_interface sound/usb/mixer_scarlett2.c:3904 [inline]
RIP: 0010:scarlett2_init_private sound/usb/mixer_scarlett2.c:3938 [inline]
RIP: 0010:snd_scarlett2_controls_create+0x793/0x3ea0 sound/usb/mixer_scarlett2.c:4275
Code: 08 48 8d 9f 00 01 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 9b 31 00 00 44 88 33 49 8d 5f 02 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 9f 31 00 00 44 0f b6 33 41 80 e6 0f 48
RSP: 0018:ffffc90000196520 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000000
RDX: ffff88810033e540 RSI: 00000000000000ff RDI: ffff888115925000
RBP: ffffc90000196880 R08: 0000000000000000 R09: ffff888115925058
R10: dffffc0000000000 R11: ffffed1022b24a0d R12: dffffc0000000000
R13: fffff52000032cb8 R14: 0000000000000002 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7661b85980 CR3: 00000001101db000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 08 48 8d or %cl,-0x73(%rax)
3: 9f lahf
4: 00 01 add %al,(%rcx)
6: 00 00 add %al,(%rax)
8: 48 89 d8 mov %rbx,%rax
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 9b 31 00 00 jne 0x31b7
1c: 44 88 33 mov %r14b,(%rbx)
1f: 49 8d 5f 02 lea 0x2(%r15),%rbx
23: 48 89 d8 mov %rbx,%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: 0f 85 9f 31 00 00 jne 0x31d6
37: 44 0f b6 33 movzbl (%rbx),%r14d
3b: 41 80 e6 0f and $0xf,%r14b
3f: 48 rex.W