Oops: general protection fault, probably for non-canonical address 0xdffffc0000000013: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000098-0x000000000000009f]
CPU: 0 UID: 0 PID: 5317 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:keyspan_break_ctl+0x83/0xc0 drivers/usb/serial/keyspan.c:-1
Code: f3 28 8b fa 41 be 9c 00 00 00 4d 03 37 bf ff ff ff ff 89 ee e8 6e 8f 19 fa 45 31 ff 83 fd ff 41 0f 94 c7 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 75 1d 45 89 3e 48 89 df 31 f6 e8 57 c3 00 00
RSP: 0018:ffffc9000f01fe08 EFLAGS: 00010203
RAX: 0000000000000013 RBX: ffff888035768000 RCX: ffff888039174b00
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 00000000ffffffff
RBP: 0000000000000000 R08: ffffffff907a507f R09: 1ffffffff20f4a0f
R10: dffffc0000000000 R11: ffffffff87ae50c0 R12: dffffc0000000000
R13: dffffc0000000000 R14: 000000000000009c R15: 0000000000000000
FS:  00007f6ed22db6c0(0000) GS:ffff88808c2c7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005599a5cb5b48 CR3: 000000000bf3a000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 send_break+0x222/0x300 drivers/tty/tty_io.c:2458
 tty_ioctl+0xd0f/0xdd0 drivers/tty/tty_io.c:-1
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6ed139e159
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:00007f6ed22dafe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6ed1625fa0 RCX: 00007f6ed139e159
RDX: 0000000000000007 RSI: 0000000000005425 RDI: 0000000000000008
RBP: 00007f6ed143503b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6ed1626038 R14: 00007f6ed1625fa0 R15: 00007ffdeaf666d8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:keyspan_break_ctl+0x83/0xc0 drivers/usb/serial/keyspan.c:-1
Code: f3 28 8b fa 41 be 9c 00 00 00 4d 03 37 bf ff ff ff ff 89 ee e8 6e 8f 19 fa 45 31 ff 83 fd ff 41 0f 94 c7 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 75 1d 45 89 3e 48 89 df 31 f6 e8 57 c3 00 00
RSP: 0018:ffffc9000f01fe08 EFLAGS: 00010203
RAX: 0000000000000013 RBX: ffff888035768000 RCX: ffff888039174b00
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 00000000ffffffff
RBP: 0000000000000000 R08: ffffffff907a507f R09: 1ffffffff20f4a0f
R10: dffffc0000000000 R11: ffffffff87ae50c0 R12: dffffc0000000000
R13: dffffc0000000000 R14: 000000000000009c R15: 0000000000000000
FS:  00007f6ed22db6c0(0000) GS:ffff88808c2c7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055998f51a660 CR3: 000000000bf3a000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	8b fa                	mov    %edx,%edi
   2:	41 be 9c 00 00 00    	mov    $0x9c,%r14d
   8:	4d 03 37             	add    (%r15),%r14
   b:	bf ff ff ff ff       	mov    $0xffffffff,%edi
  10:	89 ee                	mov    %ebp,%esi
  12:	e8 6e 8f 19 fa       	call   0xfa198f85
  17:	45 31 ff             	xor    %r15d,%r15d
  1a:	83 fd ff             	cmp    $0xffffffff,%ebp
  1d:	41 0f 94 c7          	sete   %r15b
  21:	4c 89 f0             	mov    %r14,%rax
  24:	48 c1 e8 03          	shr    $0x3,%rax
* 28:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2d:	84 c0                	test   %al,%al
  2f:	75 1d                	jne    0x4e
  31:	45 89 3e             	mov    %r15d,(%r14)
  34:	48 89 df             	mov    %rbx,%rdi
  37:	31 f6                	xor    %esi,%esi
  39:	e8 57 c3 00 00       	call   0xc395