general protection fault, probably for non-canonical address 0xdffffc0000000118: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000008c0-0x00000000000008c7]
CPU: 1 PID: 8578 Comm: kworker/1:7 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+0x28c/0x8a0 drivers/tty/serial/8250/8250_port.c:1809
Code: ba a1 cc fc 48 8b 2b 48 8b 44 24 20 42 0f b6 04 38 84 c0 0f 85 97 02 00 00 48 8b 04 24 48 63 00 48 01 c5 48 89 e8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 99 02 00 00 0f b6 6d 00 48 8b 44 24 58
RSP: 0018:ffffc900132e7830 EFLAGS: 00010006
RAX: 0000000000000118 RBX: ffff88801f3b0fd0 RCX: 1ffffffff28fa3c7
RDX: 1ffffffff28fa411 RSI: 00000000000008c0 RDI: ffffffff947d2090
RBP: 00000000000008c0 R08: ffffffff852852d7 R09: fffff5200265cf00
R10: dffffc0000000000 R11: ffffffff85290c20 R12: ffffffff947d1e30
R13: ffffffff947d1ee8 R14: ffffffff947d1de0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4c7343f000 CR3: 000000007af36000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __start_tx+0x32e/0x470 drivers/tty/serial/8250/8250_port.c:1544
 serial_port_runtime_suspend+0x21d/0x2e0 drivers/tty/serial/serial_port.c:62
 __rpm_callback+0x2df/0x790 drivers/base/power/runtime.c:394
 rpm_callback drivers/base/power/runtime.c:448 [inline]
 rpm_suspend+0x867/0x1780 drivers/base/power/runtime.c:672
 pm_runtime_work+0x175/0x210 drivers/base/power/runtime.c:976
 process_one_work kernel/workqueue.c:3254 [inline]
 process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/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+0x28c/0x8a0 drivers/tty/serial/8250/8250_port.c:1809
Code: ba a1 cc fc 48 8b 2b 48 8b 44 24 20 42 0f b6 04 38 84 c0 0f 85 97 02 00 00 48 8b 04 24 48 63 00 48 01 c5 48 89 e8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 99 02 00 00 0f b6 6d 00 48 8b 44 24 58
RSP: 0018:ffffc900132e7830 EFLAGS: 00010006
RAX: 0000000000000118 RBX: ffff88801f3b0fd0 RCX: 1ffffffff28fa3c7
RDX: 1ffffffff28fa411 RSI: 00000000000008c0 RDI: ffffffff947d2090
RBP: 00000000000008c0 R08: ffffffff852852d7 R09: fffff5200265cf00
R10: dffffc0000000000 R11: ffffffff85290c20 R12: ffffffff947d1e30
R13: ffffffff947d1ee8 R14: ffffffff947d1de0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4c7343f000 CR3: 000000007af36000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	ba a1 cc fc 48       	mov    $0x48fccca1,%edx
   5:	8b 2b                	mov    (%rbx),%ebp
   7:	48 8b 44 24 20       	mov    0x20(%rsp),%rax
   c:	42 0f b6 04 38       	movzbl (%rax,%r15,1),%eax
  11:	84 c0                	test   %al,%al
  13:	0f 85 97 02 00 00    	jne    0x2b0
  19:	48 8b 04 24          	mov    (%rsp),%rax
  1d:	48 63 00             	movslq (%rax),%rax
  20:	48 01 c5             	add    %rax,%rbp
  23:	48 89 e8             	mov    %rbp,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 38       	movzbl (%rax,%r15,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 99 02 00 00    	jne    0x2d0
  37:	0f b6 6d 00          	movzbl 0x0(%rbp),%ebp
  3b:	48 8b 44 24 58       	mov    0x58(%rsp),%rax