Oops: general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067]
CPU: 3 UID: 0 PID: 6285 Comm: syz.4.12167 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:dummy_queue+0x1ba/0xb00 drivers/usb/gadget/udc/dummy_hcd.c:737
Code: 00 49 83 bc 24 c8 05 00 00 00 0f 84 a6 07 00 00 e8 6b 32 39 fa 49 8d 7f 60 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 4f 07 00 00 45 8b 7f 60 31 ff
RSP: 0018:ffffc9000292f690 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: ffff888012ea2110 RCX: ffffc90030400000
RDX: 000000000000000c RSI: ffffffff87d12dd5 RDI: 0000000000000060
RBP: ffff888026c00158 R08: 0000000000000005 R09: 0000000000000005
R10: 0000000000000003 R11: 0000000000000000 R12: ffff888026c00c00
R13: ffff888012ea2100 R14: ffff888026c00150 R15: 0000000000000000
FS:  00007f6d6eb9e6c0(0000) GS:ffff8880d60dc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6d6df5a3f0 CR3: 0000000048945000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 usb_ep_queue+0xfa/0x3c0 drivers/usb/gadget/udc/core.c:305
 gs_start_rx+0x24f/0x650 drivers/usb/gadget/function/u_serial.c:336
 gs_start_io.isra.0+0x16b/0x2c0 drivers/usb/gadget/function/u_serial.c:571
 gs_open+0x262/0x5d0 drivers/usb/gadget/function/u_serial.c:661
 tty_open+0x3dd/0xfa0 drivers/tty/tty_io.c:2137
 chrdev_open+0x234/0x6a0 fs/char_dev.c:411
 do_dentry_open+0x6ab/0x14d0 fs/open.c:947
 vfs_open+0x82/0x3f0 fs/open.c:1052
 do_open fs/namei.c:4700 [inline]
 path_openat+0x2873/0x4280 fs/namei.c:4863
 do_file_open+0x20e/0x430 fs/namei.c:4892
 do_sys_openat2+0x10f/0x1e0 fs/open.c:1368
 do_sys_open fs/open.c:1374 [inline]
 __do_sys_openat fs/open.c:1390 [inline]
 __se_sys_openat fs/open.c:1385 [inline]
 __x64_sys_openat+0x12d/0x210 fs/open.c:1385
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6d6dd9de99
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:00007f6d6eb9e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f6d6e025fa0 RCX: 00007f6d6dd9de99
RDX: 0000000000000002 RSI: 0000200000000800 RDI: ffffffffffffff9c
RBP: 00007f6d6de33eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6d6e026038 R14: 00007f6d6e025fa0 R15: 00007fff93498578
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dummy_queue+0x1ba/0xb00 drivers/usb/gadget/udc/dummy_hcd.c:737
Code: 00 49 83 bc 24 c8 05 00 00 00 0f 84 a6 07 00 00 e8 6b 32 39 fa 49 8d 7f 60 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 4f 07 00 00 45 8b 7f 60 31 ff
RSP: 0018:ffffc9000292f690 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: ffff888012ea2110 RCX: ffffc90030400000
RDX: 000000000000000c RSI: ffffffff87d12dd5 RDI: 0000000000000060
RBP: ffff888026c00158 R08: 0000000000000005 R09: 0000000000000005
R10: 0000000000000003 R11: 0000000000000000 R12: ffff888026c00c00
R13: ffff888012ea2100 R14: ffff888026c00150 R15: 0000000000000000
FS:  00007f6d6eb9e6c0(0000) GS:ffff8880d60dc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6d6df5a3f0 CR3: 0000000048945000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	00 49 83             	add    %cl,-0x7d(%rcx)
   3:	bc 24 c8 05 00       	mov    $0x5c824,%esp
   8:	00 00                	add    %al,(%rax)
   a:	0f 84 a6 07 00 00    	je     0x7b6
  10:	e8 6b 32 39 fa       	call   0xfa393280
  15:	49 8d 7f 60          	lea    0x60(%r15),%rdi
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	74 08                	je     0x3a
  32:	3c 03                	cmp    $0x3,%al
  34:	0f 8e 4f 07 00 00    	jle    0x789
  3a:	45 8b 7f 60          	mov    0x60(%r15),%r15d
  3e:	31 ff                	xor    %edi,%edi