BUG: unable to handle page fault for address: fffff52004a02001
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 23fff4067 P4D 23fff4067 PUD 1b6a4067 PMD 59b6c067 PTE 0
Oops: Oops: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 17202 Comm: vhost-17200 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__list_del_entry_valid_or_report+0xa6/0x190 lib/list_debug.c:65
Code: 4d 89 fc 49 c1 ec 03 43 80 3c 2c 00 74 08 4c 89 ff e8 ce 11 76 fd 49 39 1f 0f 85 92 00 00 00 4d 8d 7e 08 4d 89 fc 49 c1 ec 03 <43> 80 3c 2c 00 74 08 4c 89 ff e8 ab 11 76 fd 49 39 1f 0f 85 9e 00
RSP: 0018:ffffc900109b7c80 EFLAGS: 00010a02
RAX: 1ffff920036ad200 RBX: ffffc9001b569000 RCX: 0000000000000000
RDX: 00000000d32de700 RSI: 0000000000000001 RDI: ffffc9001b569008
RBP: 0000000000100000 R08: ffffffff8b325a20 R09: ffffffff8dfcac60
R10: dffffc0000000000 R11: fffffbfff1f1a07f R12: 1ffff92004a02001
R13: dffffc0000000000 R14: ffffc90025010000 R15: ffffc90025010008
FS:  00007fc0d2a666c0(0000) GS:ffff888125ecd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffff52004a02001 CR3: 0000000029dc4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __list_del_entry_valid include/linux/list.h:132 [inline]
 __list_del_entry include/linux/list.h:246 [inline]
 list_del include/linux/list.h:260 [inline]
 kcov_remote_area_get kernel/kcov.c:143 [inline]
 kcov_remote_start+0x2af/0x710 kernel/kcov.c:930
 kcov_remote_start_common include/linux/kcov.h:48 [inline]
 vhost_run_work_list+0x129/0x1e0 drivers/vhost/vhost.c:453
 vhost_task_fn+0x2ef/0x4a0 kernel/vhost_task.c:49
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
CR2: fffff52004a02001
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0xa6/0x190 lib/list_debug.c:65
Code: 4d 89 fc 49 c1 ec 03 43 80 3c 2c 00 74 08 4c 89 ff e8 ce 11 76 fd 49 39 1f 0f 85 92 00 00 00 4d 8d 7e 08 4d 89 fc 49 c1 ec 03 <43> 80 3c 2c 00 74 08 4c 89 ff e8 ab 11 76 fd 49 39 1f 0f 85 9e 00
RSP: 0018:ffffc900109b7c80 EFLAGS: 00010a02
RAX: 1ffff920036ad200 RBX: ffffc9001b569000 RCX: 0000000000000000
RDX: 00000000d32de700 RSI: 0000000000000001 RDI: ffffc9001b569008
RBP: 0000000000100000 R08: ffffffff8b325a20 R09: ffffffff8dfcac60
R10: dffffc0000000000 R11: fffffbfff1f1a07f R12: 1ffff92004a02001
R13: dffffc0000000000 R14: ffffc90025010000 R15: ffffc90025010008
FS:  00007fc0d2a666c0(0000) GS:ffff888125ecd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffff52004a02001 CR3: 0000000029dc4000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	4d 89 fc             	mov    %r15,%r12
   3:	49 c1 ec 03          	shr    $0x3,%r12
   7:	43 80 3c 2c 00       	cmpb   $0x0,(%r12,%r13,1)
   c:	74 08                	je     0x16
   e:	4c 89 ff             	mov    %r15,%rdi
  11:	e8 ce 11 76 fd       	call   0xfd7611e4
  16:	49 39 1f             	cmp    %rbx,(%r15)
  19:	0f 85 92 00 00 00    	jne    0xb1
  1f:	4d 8d 7e 08          	lea    0x8(%r14),%r15
  23:	4d 89 fc             	mov    %r15,%r12
  26:	49 c1 ec 03          	shr    $0x3,%r12
* 2a:	43 80 3c 2c 00       	cmpb   $0x0,(%r12,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 ff             	mov    %r15,%rdi
  34:	e8 ab 11 76 fd       	call   0xfd7611e4
  39:	49 39 1f             	cmp    %rbx,(%r15)
  3c:	0f                   	.byte 0xf
  3d:	85                   	.byte 0x85
  3e:	9e                   	sahf