Oops: general protection fault, probably for non-canonical address 0xdffffc000000000a: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057]
CPU: 1 UID: 0 PID: 8701 Comm: syz.6.2998 Not tainted syzkaller #0 9a2c17613351c9eac8e18d74829f474689ac6bc1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:dummy_queue+0x1c0/0x8e0 drivers/usb/gadget/udc/dummy_hcd.c:717
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 39 72 26 fe 4d 8b 24 24 49 83 c4 50 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 f5 05 00 00 45 8b 24 24 44 89 e6 83 e6 02
RSP: 0018:ffffc90002997898 EFLAGS: 00010006
RAX: 000000000000000a RBX: ffff888116663110 RCX: dffffc0000000000
RDX: ffff888122d28000 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffffc90002997910 R08: 0000000000000065 R09: 0000000000000065
R10: 0000000000000000 R11: ffffffff83b9da20 R12: 0000000000000050
R13: ffff888116663100 R14: 1ffff11022ccc620 R15: ffff888101f9cc90
FS:  00007f7d0b1886c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2a2552 CR3: 000000012d232000 CR4: 00000000003526b0
DR0: 0000000000000006 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 usb_ep_queue+0xe3/0x230 drivers/usb/gadget/udc/core.c:305
 gs_start_tx+0x446/0xd90 drivers/usb/gadget/function/u_serial.c:279
 gs_write+0xc8/0xf0 drivers/usb/gadget/function/u_serial.c:753
 process_output_block drivers/tty/n_tty.c:575 [inline]
 n_tty_write+0xd6c/0x1230 drivers/tty/n_tty.c:2390
 iterate_tty_write drivers/tty/tty_io.c:1015 [inline]
 file_tty_write+0x556/0xa50 drivers/tty/tty_io.c:1090
 tty_write+0x40/0x50 drivers/tty/tty_io.c:1111
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x75f/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f7d0a39e0d9
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:00007f7d0b188028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f7d0a625fa0 RCX: 00007f7d0a39e0d9
RDX: 0000000000000002 RSI: 0000200000000a00 RDI: 0000000000000005
RBP: 00007f7d0a435024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7d0a626038 R14: 00007f7d0a625fa0 R15: 00007ffd567cdf38
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dummy_queue+0x1c0/0x8e0 drivers/usb/gadget/udc/dummy_hcd.c:717
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 39 72 26 fe 4d 8b 24 24 49 83 c4 50 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 f5 05 00 00 45 8b 24 24 44 89 e6 83 e6 02
RSP: 0018:ffffc90002997898 EFLAGS: 00010006

RAX: 000000000000000a RBX: ffff888116663110 RCX: dffffc0000000000
RDX: ffff888122d28000 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffffc90002997910 R08: 0000000000000065 R09: 0000000000000065
R10: 0000000000000000 R11: ffffffff83b9da20 R12: 0000000000000050
R13: ffff888116663100 R14: 1ffff11022ccc620 R15: ffff888101f9cc90
FS:  00007f7d0b1886c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2a2552 CR3: 000000012d232000 CR4: 00000000003526b0
DR0: 0000000000000006 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	fc                   	cld
   1:	ff                   	lcall  (bad)
   2:	df 80 3c 08 00 74    	filds  0x7400083c(%rax)
   8:	08 4c 89 e7          	or     %cl,-0x19(%rcx,%rcx,4)
   c:	e8 39 72 26 fe       	call   0xfe26724a
  11:	4d 8b 24 24          	mov    (%r12),%r12
  15:	49 83 c4 50          	add    $0x50,%r12
  19:	4c 89 e0             	mov    %r12,%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:	0f b6 04 08          	movzbl (%rax,%rcx,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 f5 05 00 00    	jne    0x62b
  36:	45 8b 24 24          	mov    (%r12),%r12d
  3a:	44 89 e6             	mov    %r12d,%esi
  3d:	83 e6 02             	and    $0x2,%esi