gadgetfs: bound to dummy_udc driver
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: 7608 Comm: syz.4.604 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:dummy_udc_start+0xcd/0x1e0 drivers/usb/gadget/udc/dummy_hcd.c:1003
Code: 41 83 ff 03 74 18 41 83 ff 05 0f 85 8e 00 00 00 e8 28 2d cd fa eb 0c e8 21 2d cd fa eb 05 e8 1a 2d cd fa 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 84 aa 25 fb 4d 8b 36 4c 89 f7 e8
RSP: 0018:ffffc900042ff8b0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff8de5b020 RCX: 0000000000080000
RDX: ffffc9000bb79000 RSI: 000000000002965f RDI: 0000000000029660
RBP: ffff8881447a2000 R08: ffff8880229a3c00 R09: 0000000000000004
R10: 0000000000000005 R11: 0000000000000002 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
FS:  00007f2ffb11b6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2ffb0fad58 CR3: 0000000021a4b000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 usb_gadget_udc_start_locked drivers/usb/gadget/udc/core.c:1227 [inline]
 gadget_bind_driver+0x390/0x770 drivers/usb/gadget/udc/core.c:1656
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x247/0xae0 drivers/base/dd.c:717
 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:879
 driver_probe_device+0x4f/0x420 drivers/base/dd.c:909
 __driver_attach+0x444/0x6d0 drivers/base/dd.c:1295
 bus_for_each_dev+0x235/0x2b0 drivers/base/bus.c:370
 bus_add_driver+0x340/0x630 drivers/base/bus.c:723
 driver_register+0x23a/0x310 drivers/base/driver.c:246
 usb_gadget_register_driver_owner+0xf9/0x270 drivers/usb/gadget/udc/core.c:1730
 dev_config+0xe49/0x1260 drivers/usb/gadget/legacy/inode.c:1878
 vfs_write+0x299/0x9a0 fs/read_write.c:582
 ksys_write+0x151/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2ffa19de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2ffb11b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f2ffa425fa0 RCX: 00007f2ffa19de99
RDX: 000000000000001f RSI: 0000200000000400 RDI: 0000000000000003
RBP: 00007f2ffa233eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2ffa426038 R14: 00007f2ffa425fa0 R15: 00007ffdecc68338
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dummy_udc_start+0xcd/0x1e0 drivers/usb/gadget/udc/dummy_hcd.c:1003
Code: 41 83 ff 03 74 18 41 83 ff 05 0f 85 8e 00 00 00 e8 28 2d cd fa eb 0c e8 21 2d cd fa eb 05 e8 1a 2d cd fa 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 84 aa 25 fb 4d 8b 36 4c 89 f7 e8
RSP: 0018:ffffc900042ff8b0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff8de5b020 RCX: 0000000000080000
RDX: ffffc9000bb79000 RSI: 000000000002965f RDI: 0000000000029660
RBP: ffff8881447a2000 R08: ffff8880229a3c00 R09: 0000000000000004
R10: 0000000000000005 R11: 0000000000000002 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
FS:  00007f2ffb11b6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcd7452568 CR3: 0000000021a4b000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
   0:	41 83 ff 03          	cmp    $0x3,%r15d
   4:	74 18                	je     0x1e
   6:	41 83 ff 05          	cmp    $0x5,%r15d
   a:	0f 85 8e 00 00 00    	jne    0x9e
  10:	e8 28 2d cd fa       	call   0xfacd2d3d
  15:	eb 0c                	jmp    0x23
  17:	e8 21 2d cd fa       	call   0xfacd2d3d
  1c:	eb 05                	jmp    0x23
  1e:	e8 1a 2d cd fa       	call   0xfacd2d3d
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 f7             	mov    %r14,%rdi
  34:	e8 84 aa 25 fb       	call   0xfb25aabd
  39:	4d 8b 36             	mov    (%r14),%r14
  3c:	4c 89 f7             	mov    %r14,%rdi
  3f:	e8                   	.byte 0xe8