1024-page vmalloc region starting at 0xffffc9000d7a9000 allocated at kcov_ioctl+0x58/0x6 kernel/kcov.c:716[  786.139851][ T4640]  1024-page vmalloc region starting at 0xffffc9000d7a9000 allocated at kcov_ioctl+0x58/0x650
list_del corruption. next->prev should be ffffc90019de4000, but was 0000000000000000. (next=ffffc9000d7a9000)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:67!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 4640 Comm: vhost-4638 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__list_del_entry_valid_or_report+0x18a/0x190 lib/list_debug.c:65
Code: 8c be 7d fd 43 80 3c 2c 00 74 08 4c 89 ff e8 2d c3 9d fd 49 8b 56 08 48 c7 c7 00 e3 3d 8b 48 89 de 4c 89 f1 e8 27 93 a4 fc 90 <0f> 0b cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000489fc80 EFLAGS: 00010246
RAX: 000000000000006d RBX: ffffc90019de4000 RCX: 9d004c951fa00200
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000100000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed101712487b R12: 1ffff92001af5201
R13: dffffc0000000000 R14: ffffc9000d7a9000 R15: ffffc9000d7a9008
FS:  00007f1fda8e66c0(0000) GS:ffff888126ef7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fd21ff8 CR3: 000000005ecd4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __list_del_entry_valid include/linux/list.h:132 [inline]
 __list_del_entry include/linux/list.h:223 [inline]
 list_del include/linux/list.h:237 [inline]
 kcov_remote_area_get kernel/kcov.c:143 [inline]
 kcov_remote_start+0x2b0/0x6f0 kernel/kcov.c:906
 kcov_remote_start_common include/linux/kcov.h:50 [inline]
 vhost_run_work_list+0x12a/0x1e0 drivers/vhost/vhost.c:453
 vhost_task_fn+0x27c/0x430 kernel/vhost_task.c:49
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0x18a/0x190 lib/list_debug.c:65
Code: 8c be 7d fd 43 80 3c 2c 00 74 08 4c 89 ff e8 2d c3 9d fd 49 8b 56 08 48 c7 c7 00 e3 3d 8b 48 89 de 4c 89 f1 e8 27 93 a4 fc 90 <0f> 0b cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000489fc80 EFLAGS: 00010246
RAX: 000000000000006d RBX: ffffc90019de4000 RCX: 9d004c951fa00200
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000100000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed101712487b R12: 1ffff92001af5201
R13: dffffc0000000000 R14: ffffc9000d7a9000 R15: ffffc9000d7a9008
FS:  00007f1fda8e66c0(0000) GS:ffff888126ef7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fd21ff8 CR3: 000000005ecd4000 CR4: 00000000003526f0