general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f]
CPU: 0 PID: 10836 Comm: syz.6.3124 Tainted: G        W          syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:dummy_queue+0x1b7/0x8e0 drivers/usb/gadget/udc/dummy_hcd.c:717
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 92 63 6a fe 4d 8b 24 24 49 83 c4 58 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:ffffc90007fd7888 EFLAGS: 00010002
RAX: 000000000000000b RBX: ffff88812d1cde10 RCX: dffffc0000000000
RDX: ffff8881150a5100 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffffc90007fd7900 R08: ffff888131eba401 R09: 1ffff110263d7480
R10: 0000000000000000 R11: ffffffff834c8bc0 R12: 0000000000000058
R13: ffff88812d1cde00 R14: 1ffff11025a39bc0 R15: ffff88810da70c90
FS:  00007f8c6e2bd6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8c6d44fd3b CR3: 0000000147204000 CR4: 00000000003506b0
Call Trace:
 <TASK>
 usb_ep_queue+0xdf/0x220 drivers/usb/gadget/udc/core.c:308
 gs_start_tx+0x455/0xdb0 drivers/usb/gadget/function/u_serial.c:275
 gs_write+0xc5/0xf0 drivers/usb/gadget/function/u_serial.c:756
 process_output_block drivers/tty/n_tty.c:586 [inline]
 n_tty_write+0xd8c/0x1210 drivers/tty/n_tty.c:2377
 do_tty_write drivers/tty/tty_io.c:1018 [inline]
 file_tty_write+0x4e9/0x850 drivers/tty/tty_io.c:1089
 tty_write+0x3c/0x50 drivers/tty/tty_io.c:1110
 call_write_iter include/linux/fs.h:2282 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x5ef/0xd00 fs/read_write.c:584
 ksys_write+0x14a/0x260 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:646
 x64_sys_call+0x27b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f8c6d39de99
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:00007f8c6e2bd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8c6d625fa0 RCX: 00007f8c6d39de99
RDX: 0000000000000002 RSI: 0000200000000000 RDI: 0000000000000004
RBP: 00007f8c6d433eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8c6d626038 R14: 00007f8c6d625fa0 R15: 00007ffe5b0ab268
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dummy_queue+0x1b7/0x8e0 drivers/usb/gadget/udc/dummy_hcd.c:717
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 92 63 6a fe 4d 8b 24 24 49 83 c4 58 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:ffffc90007fd7888 EFLAGS: 00010002
RAX: 000000000000000b RBX: ffff88812d1cde10 RCX: dffffc0000000000
RDX: ffff8881150a5100 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffffc90007fd7900 R08: ffff888131eba401 R09: 1ffff110263d7480
R10: 0000000000000000 R11: ffffffff834c8bc0 R12: 0000000000000058
R13: ffff88812d1cde00 R14: 1ffff11025a39bc0 R15: ffff88810da70c90
FS:  00007f8c6e2bd6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8c6d44fd3b CR3: 0000000147204000 CR4: 00000000003506b0
----------------
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 92 63 6a fe       	call   0xfe6a63a3
  11:	4d 8b 24 24          	mov    (%r12),%r12
  15:	49 83 c4 58          	add    $0x58,%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