general protection fault, probably for non-canonical address 0xdffffc0000000120: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000900-0x0000000000000907]
CPU: 0 PID: 8 Comm: kworker/0:1 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: pm pm_runtime_work
RIP: 0010:serial8250_tx_chars+0x3c7/0x8b0 drivers/tty/serial/8250/8250_port.c:1809
Code: 02 00 00 e8 2b 96 9a fc 48 8b 44 24 30 80 38 00 0f 85 21 04 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 28 38 d0 7f 08 84 c0 0f 85 af 03 00 00 48 8b 44 24 18 41
RSP: 0018:ffffc900000d7a10 EFLAGS: 00010046
RAX: 0000000000000120 RBX: ffffffff949172e0 RCX: ffffffff9491758c
RDX: 0000000000000000 RSI: ffffffff84f26285 RDI: ffffffff94917590
RBP: dffffc0000000000 R08: 0000000000000004 R09: ffffffff94917404
R10: 0000000000000900 R11: 0000000000000002 R12: 0000000000000900
R13: ffff88801f480c30 R14: 0000000000000010 R15: ffff88801f4cf158
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000c2c0 CR3: 000000007a396000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __start_tx+0x3e9/0x4a0 drivers/tty/serial/8250/8250_port.c:1544
 serial8250_start_tx+0x363/0x530 drivers/tty/serial/8250/8250_port.c:1653
 serial_port_runtime_suspend+0x27c/0x350 drivers/tty/serial/serial_port.c:62
 __rpm_callback+0xc5/0x4c0 drivers/base/power/runtime.c:394
 rpm_callback+0x1da/0x220 drivers/base/power/runtime.c:448
 rpm_suspend+0x2e7/0x11c0 drivers/base/power/runtime.c:672
 pm_runtime_work+0x134/0x150 drivers/base/power/runtime.c:976
 process_one_work+0x9a9/0x1a60 kernel/workqueue.c:3254
 process_scheduled_works kernel/workqueue.c:3335 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:serial8250_tx_chars+0x3c7/0x8b0 drivers/tty/serial/8250/8250_port.c:1809
Code: 02 00 00 e8 2b 96 9a fc 48 8b 44 24 30 80 38 00 0f 85 21 04 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 28 38 d0 7f 08 84 c0 0f 85 af 03 00 00 48 8b 44 24 18 41
RSP: 0018:ffffc900000d7a10 EFLAGS: 00010046
RAX: 0000000000000120 RBX: ffffffff949172e0 RCX: ffffffff9491758c
RDX: 0000000000000000 RSI: ffffffff84f26285 RDI: ffffffff94917590
RBP: dffffc0000000000 R08: 0000000000000004 R09: ffffffff94917404
R10: 0000000000000900 R11: 0000000000000002 R12: 0000000000000900
R13: ffff88801f480c30 R14: 0000000000000010 R15: ffff88801f4cf158
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000c2c0 CR3: 000000007a396000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	02 00                	add    (%rax),%al
   2:	00 e8                	add    %ch,%al
   4:	2b 96 9a fc 48 8b    	sub    -0x74b70366(%rsi),%edx
   a:	44 24 30             	rex.R and $0x30,%al
   d:	80 38 00             	cmpb   $0x0,(%rax)
  10:	0f 85 21 04 00 00    	jne    0x437
  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 28          	movzbl (%rax,%rbp,1),%eax <-- trapping instruction
  2e:	38 d0                	cmp    %dl,%al
  30:	7f 08                	jg     0x3a
  32:	84 c0                	test   %al,%al
  34:	0f 85 af 03 00 00    	jne    0x3e9
  3a:	48 8b 44 24 18       	mov    0x18(%rsp),%rax
  3f:	41                   	rex.B