[Android 6.1] general protection fault in snd_scarlett2_controls_create
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syzbot
Apr 9, 2026, 10:21:21 PM (11 days ago) Apr 9
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: b1e92db6a41f ANDROID: GKI: Update symbol list for mtk
git tree: android14-6.1
console output: https://syzkaller.appspot.com/x/log.txt?x=14424cd2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=869e5ae06f0f48a4
dashboard link: https://syzkaller.appspot.com/bug?extid=09c3f88d3038d4ed004b
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=112f074e580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12424cd2580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f9207e492162/disk-b1e92db6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/592426f66b9f/vmlinux-b1e92db6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8da0a612ee94/bzImage-b1e92db6.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+09c3f8...@syzkaller.appspotmail.com
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: 0 PID: 19 Comm: kworker/0:1 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:ffffc90000136520 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000000
RDX: ffff888100336540 RSI: 00000000000000ff RDI: ffff888115926000
RBP: ffffc90000136880 R08: 0000000000000000 R09: ffff888115926058
R10: dffffc0000000000 R11: ffffed1022b24c0d R12: dffffc0000000000
R13: fffff52000026cb8 R14: 0000000000000002 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeed559f14 CR3: 0000000120799000 CR4: 00000000003506b0
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:ffffc90000136520 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000000
RDX: ffff888100336540 RSI: 00000000000000ff RDI: ffff888115926000
RBP: ffffc90000136880 R08: 0000000000000000 R09: ffff888115926058
R10: dffffc0000000000 R11: ffffed1022b24c0d R12: dffffc0000000000
R13: fffff52000026cb8 R14: 0000000000000002 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeed559f14 CR3: 000000012c4ed000 CR4: 00000000003506b0
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
---
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 syzk...@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
syzbot found the following issue on:
HEAD commit: b1e92db6a41f ANDROID: GKI: Update symbol list for mtk
git tree: android14-6.1
console output: https://syzkaller.appspot.com/x/log.txt?x=14424cd2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=869e5ae06f0f48a4
dashboard link: https://syzkaller.appspot.com/bug?extid=09c3f88d3038d4ed004b
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=112f074e580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12424cd2580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f9207e492162/disk-b1e92db6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/592426f66b9f/vmlinux-b1e92db6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8da0a612ee94/bzImage-b1e92db6.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+09c3f8...@syzkaller.appspotmail.com
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: 0 PID: 19 Comm: kworker/0:1 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:ffffc90000136520 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000000
RDX: ffff888100336540 RSI: 00000000000000ff RDI: ffff888115926000
RBP: ffffc90000136880 R08: 0000000000000000 R09: ffff888115926058
R10: dffffc0000000000 R11: ffffed1022b24c0d R12: dffffc0000000000
R13: fffff52000026cb8 R14: 0000000000000002 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeed559f14 CR3: 0000000120799000 CR4: 00000000003506b0
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:ffffc90000136520 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000000
RDX: ffff888100336540 RSI: 00000000000000ff RDI: ffff888115926000
RBP: ffffc90000136880 R08: 0000000000000000 R09: ffff888115926058
R10: dffffc0000000000 R11: ffffed1022b24c0d R12: dffffc0000000000
R13: fffff52000026cb8 R14: 0000000000000002 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeed559f14 CR3: 000000012c4ed000 CR4: 00000000003506b0
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
---
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 syzk...@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
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