[syzbot] [usb?] general protection fault in usb_gadget_udc_reset (4)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 566771afc7a8 Merge tag 'v6.18-rc2-smb-server-fixes' of git..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13956e7c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=8345ce4ce316ca28
dashboard link: https://syzkaller.appspot.com/bug?extid=19bed92c97bee999e5db
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/52417ef1f782/disk-566771af.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/66730a263bf1/vmlinux-566771af.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1fe0762efb1f/bzImage-566771af.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+19bed9...@syzkaller.appspotmail.com

usb 1-1: new full-speed USB device number 6 using dummy_hcd
usb 1-1: unable to read config index 0 descriptor/all
usb 1-1: can't read configurations, error -110
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 1 UID: 0 PID: 5869 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:usb_gadget_udc_reset+0x27/0x60 drivers/usb/gadget/udc/core.c:1195
Code: 90 90 90 f3 0f 1e fa 41 56 53 49 89 f6 48 89 fb e8 3e 6b fb fa 49 83 c6 40 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 bb 22 5d fb 4d 8b 1e 48 89 df 2e 2e
RSP: 0018:ffffc900051b7260 EFLAGS: 00010202
RAX: 0000000000000008 RBX: ffff888143b54c40 RCX: dffffc0000000000
RDX: ffffc9001a01b000 RSI: 0000000000002b35 RDI: 0000000000002b36
RBP: ffff8880305aa66c R08: ffffffff8ed62877 R09: 1ffffffff1dac50e
R10: dffffc0000000000 R11: fffffbfff1dac50f R12: ffff888143b54c40
R13: 1ffff11004eceaa1 R14: 0000000000000040 R15: 1ffff1102876a987
FS: 0000000000000000(0000) GS:ffff888126efc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fce4efb4f98 CR3: 000000004a02e000 CR4: 00000000003526f0
Call Trace:
<TASK>
set_link_state+0x80b/0x1220 drivers/usb/gadget/udc/dummy_hcd.c:469
dummy_hub_control+0xcc0/0x1760 drivers/usb/gadget/udc/dummy_hcd.c:2327
rh_call_control drivers/usb/core/hcd.c:656 [inline]
rh_urb_enqueue drivers/usb/core/hcd.c:821 [inline]
usb_hcd_submit_urb+0xde9/0x1a80 drivers/usb/core/hcd.c:1542
usb_start_wait_urb+0x114/0x4c0 drivers/usb/core/message.c:59
usb_internal_control_msg drivers/usb/core/message.c:103 [inline]
usb_control_msg+0x232/0x3e0 drivers/usb/core/message.c:154
set_port_feature drivers/usb/core/hub.c:470 [inline]
hub_port_reset+0x390/0x1740 drivers/usb/core/hub.c:3082
hub_port_init+0x2b0/0x2800 drivers/usb/core/hub.c:4938
hub_port_connect drivers/usb/core/hub.c:5495 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
port_event drivers/usb/core/hub.c:5870 [inline]
hub_event+0x2532/0x4a20 drivers/usb/core/hub.c:5952
process_one_work kernel/workqueue.c:3263 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:usb_gadget_udc_reset+0x27/0x60 drivers/usb/gadget/udc/core.c:1195
Code: 90 90 90 f3 0f 1e fa 41 56 53 49 89 f6 48 89 fb e8 3e 6b fb fa 49 83 c6 40 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 bb 22 5d fb 4d 8b 1e 48 89 df 2e 2e
RSP: 0018:ffffc900051b7260 EFLAGS: 00010202
RAX: 0000000000000008 RBX: ffff888143b54c40 RCX: dffffc0000000000
RDX: ffffc9001a01b000 RSI: 0000000000002b35 RDI: 0000000000002b36
RBP: ffff8880305aa66c R08: ffffffff8ed62877 R09: 1ffffffff1dac50e
R10: dffffc0000000000 R11: fffffbfff1dac50f R12: ffff888143b54c40
R13: 1ffff11004eceaa1 R14: 0000000000000040 R15: 1ffff1102876a987
FS: 0000000000000000(0000) GS:ffff888126efc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fce4efb4f98 CR3: 000000004a02e000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: f3 0f 1e fa endbr64
7: 41 56 push %r14
9: 53 push %rbx
a: 49 89 f6 mov %rsi,%r14
d: 48 89 fb mov %rdi,%rbx
10: e8 3e 6b fb fa call 0xfafb6b53
15: 49 83 c6 40 add $0x40,%r14
19: 4c 89 f0 mov %r14,%rax
1c: 48 c1 e8 03 shr $0x3,%rax
20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
27: fc ff df
* 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction
2e: 74 08 je 0x38
30: 4c 89 f7 mov %r14,%rdi
33: e8 bb 22 5d fb call 0xfb5d22f3
38: 4d 8b 1e mov (%r14),%r11
3b: 48 89 df mov %rbx,%rdi
3e: 2e cs
3f: 2e cs


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 651690480a96 Merge tag 'spi-fix-v7.0-rc2' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11ec0806580000
kernel config: https://syzkaller.appspot.com/x/.config?x=2a019678b1a3a692
dashboard link: https://syzkaller.appspot.com/bug?extid=19bed92c97bee999e5db
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=10b2db5a580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14fed8d6580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0e393fccfaa3/disk-65169048.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2930e8c98c89/vmlinux-65169048.xz
kernel image: https://storage.googleapis.com/syzbot-assets/34e9e7d322b1/bzImage-65169048.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+19bed9...@syzkaller.appspotmail.com

usb 1-1: reset high-speed USB device number 2 using dummy_hcd
usb 1-1: device descriptor read/8, error -32
Oops: general protection fault, probably [ 120.351719][ T6052] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN PTI

KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]

CPU: 0 UID: 0 PID: 6052 Comm: kworker/0:7 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:usb_gadget_udc_reset+0x27/0x60 drivers/usb/gadget/udc/core.c:1200
Code: 90 90 90 f3 0f 1e fa 41 56 53 49 89 f6 48 89 fb e8 6e 5c c0 fa 49 83 c6 40 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 cb 74 26 fb 4d 8b 1e 48 89 df 2e e8
RSP: 0018:ffffc9000415e4c8 EFLAGS: 00010202
RAX: 0000000000000008 RBX: ffff888029facc40 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8880341b2b6c R08: ffffffff8f6a4eb7 R09: 1ffffffff1ed49d6
R10: dffffc0000000000 R11: fffffbfff1ed49d7 R12: ffff888029facc40
R13: 1ffff110053f38a1 R14: 0000000000000040 R15: 1ffff110053f5987
FS: 0000000000000000(0000) GS:ffff88812633d000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007eff7c4020c0 CR3: 00000000324ce000 CR4: 00000000003526f0

Call Trace:
<TASK>
set_link_state+0x80b/0x1220 drivers/usb/gadget/udc/dummy_hcd.c:469

dummy_hub_control+0xa09/0x1a00 drivers/usb/gadget/udc/dummy_hcd.c:-1
rh_call_control drivers/usb/core/hcd.c:652 [inline]
rh_urb_enqueue drivers/usb/core/hcd.c:817 [inline]
usb_hcd_submit_urb+0xdbe/0x1b50 drivers/usb/core/hcd.c:1538
usb_start_wait_urb+0x12b/0x510 drivers/usb/core/message.c:59

usb_internal_control_msg drivers/usb/core/message.c:103 [inline]
usb_control_msg+0x232/0x3e0 drivers/usb/core/message.c:154

set_port_feature drivers/usb/core/hub.c:466 [inline]
hub_port_reset+0x3c7/0x1820 drivers/usb/core/hub.c:3083
hub_port_init+0x299/0x28c0 drivers/usb/core/hub.c:4939
usb_reset_and_verify_device+0x1661/0x1af0 drivers/usb/core/hub.c:6215
usb_reset_device+0x551/0xb40 drivers/usb/core/hub.c:6410
sd_config+0x27f/0x15b0 drivers/media/usb/gspca/se401.c:221
gspca_dev_probe2+0x81e/0x1450 drivers/media/usb/gspca/gspca.c:1529
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+0x25b/0x2f0 drivers/base/bus.c:500
__device_attach+0x2c8/0x450 drivers/base/dd.c:1033
device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1088
bus_probe_device+0x12d/0x220 drivers/base/bus.c:574
device_add+0x7b6/0xb80 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+0x25b/0x2f0 drivers/base/bus.c:500
__device_attach+0x2c8/0x450 drivers/base/dd.c:1033
device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1088
bus_probe_device+0x12d/0x220 drivers/base/bus.c:574
device_add+0x7b6/0xb80 drivers/base/core.c:3689
usb_new_device+0x9f8/0x16e0 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+0x2a49/0x4f60 drivers/usb/core/hub.c:5953
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
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
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---

RIP: 0010:usb_gadget_udc_reset+0x27/0x60 drivers/usb/gadget/udc/core.c:1200
Code: 90 90 90 f3 0f 1e fa 41 56 53 49 89 f6 48 89 fb e8 6e 5c c0 fa 49 83 c6 40 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 cb 74 26 fb 4d 8b 1e 48 89 df 2e e8
RSP: 0018:ffffc9000415e4c8 EFLAGS: 00010202
RAX: 0000000000000008 RBX: ffff888029facc40 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8880341b2b6c R08: ffffffff8f6a4eb7 R09: 1ffffffff1ed49d6
R10: dffffc0000000000 R11: fffffbfff1ed49d7 R12: ffff888029facc40
R13: 1ffff110053f38a1 R14: 0000000000000040 R15: 1ffff110053f5987
FS: 0000000000000000(0000) GS:ffff88812633d000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007eff7c4020c0 CR3: 00000000379ee000 CR4: 00000000003526f0

----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: f3 0f 1e fa endbr64
7: 41 56 push %r14
9: 53 push %rbx
a: 49 89 f6 mov %rsi,%r14
d: 48 89 fb mov %rdi,%rbx

10: e8 6e 5c c0 fa call 0xfac05c83

15: 49 83 c6 40 add $0x40,%r14
19: 4c 89 f0 mov %r14,%rax
1c: 48 c1 e8 03 shr $0x3,%rax
20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
27: fc ff df
* 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction
2e: 74 08 je 0x38
30: 4c 89 f7 mov %r14,%rdi

33: e8 cb 74 26 fb call 0xfb267503

38: 4d 8b 1e mov (%r14),%r11
3b: 48 89 df mov %rbx,%rdi
3e: 2e cs

3f: e8 .byte 0xe8


---
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