general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 27169 Comm: kworker/1:17 Not tainted 6.4.0-rc6-next-20230615-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Workqueue: pm pm_runtime_work
RIP: 0010:serial8250_tx_chars+0x3b5/0xf10 drivers/tty/serial/8250/8250_port.c:1813
Code: 05 00 00 e8 5d 34 f9 fc 48 8b 44 24 30 80 38 00 0f 85 ab 09 00 00 4d 03 a5 a0 03 00 00 4c 89 e0 4c 89 e2 48 c1 e8 03 83 e2 07 <0f> b6 04 18 38 d0 7f 08 84 c0 0f 85 96 09 00 00 48 8b 44 24 18 41
RSP: 0018:ffffc900035ffa58 EFLAGS: 00010046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff848b2dc3 RDI: ffffffff923ff990
RBP: ffffffff923ff6e0 R08: 0000000000000004 R09: 0000000000000fff
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff88801f630c30 R14: 0000000000000010 R15: 0000000000000fff
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f96a5145d38 CR3: 000000007d2fa000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 __start_tx drivers/tty/serial/8250/8250_port.c:1547 [inline]
 serial8250_start_tx+0x7b9/0x990 drivers/tty/serial/8250/8250_port.c:1656
 serial_port_runtime_resume+0x29e/0x330 drivers/tty/serial/serial_port.c:40
 __rpm_callback+0xc9/0x330 drivers/base/power/runtime.c:392
 rpm_callback+0x1e3/0x230 drivers/base/power/runtime.c:446
 rpm_resume+0xf3f/0x1aa0 drivers/base/power/runtime.c:912
 pm_runtime_work+0x12e/0x180 drivers/base/power/runtime.c:977
 process_one_work+0xa34/0x16f0 kernel/workqueue.c:2594
 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2745
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:serial8250_tx_chars+0x3b5/0xf10 drivers/tty/serial/8250/8250_port.c:1813
Code: 05 00 00 e8 5d 34 f9 fc 48 8b 44 24 30 80 38 00 0f 85 ab 09 00 00 4d 03 a5 a0 03 00 00 4c 89 e0 4c 89 e2 48 c1 e8 03 83 e2 07 <0f> b6 04 18 38 d0 7f 08 84 c0 0f 85 96 09 00 00 48 8b 44 24 18 41
RSP: 0018:ffffc900035ffa58 EFLAGS: 00010046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff848b2dc3 RDI: ffffffff923ff990
RBP: ffffffff923ff6e0 R08: 0000000000000004 R09: 0000000000000fff
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff88801f630c30 R14: 0000000000000010 R15: 0000000000000fff
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f96a5145d38 CR3: 000000007d2fa000 CR4: 00000000003506e0
----------------
Code disassembly (best guess):
   0:	05 00 00 e8 5d       	add    $0x5de80000,%eax
   5:	34 f9                	xor    $0xf9,%al
   7:	fc                   	cld
   8:	48 8b 44 24 30       	mov    0x30(%rsp),%rax
   d:	80 38 00             	cmpb   $0x0,(%rax)
  10:	0f 85 ab 09 00 00    	jne    0x9c1
  16:	4d 03 a5 a0 03 00 00 	add    0x3a0(%r13),%r12
  1d:	4c 89 e0             	mov    %r12,%rax
  20:	4c 89 e2             	mov    %r12,%rdx
  23:	48 c1 e8 03          	shr    $0x3,%rax
  27:	83 e2 07             	and    $0x7,%edx
* 2a:	0f b6 04 18          	movzbl (%rax,%rbx,1),%eax <-- trapping instruction
  2e:	38 d0                	cmp    %dl,%al
  30:	7f 08                	jg     0x3a
  32:	84 c0                	test   %al,%al
  34:	0f 85 96 09 00 00    	jne    0x9d0
  3a:	48 8b 44 24 18       	mov    0x18(%rsp),%rax
  3f:	41                   	rex.B