syzbot

list_del corruption, ffff88805b703890->next is NULL
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:53!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 13863 Comm: syz.3.2326 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:__list_del_entry_valid_or_report+0xdf/0x190 lib/list_debug.c:52
Code: 49 39 1f 0f 85 9e 00 00 00 b0 01 5b 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc cc 48 c7 c7 a0 fc 29 8c 48 89 de e8 42 ee 63 fc 90 <0f> 0b 48 c7 c7 00 fd 29 8c 48 89 de e8 30 ee 63 fc 90 0f 0b 4c 89
RSP: 0018:ffffc90000a08d58 EFLAGS: 00010046
RAX: 0000000000000033 RBX: ffff88805b703890 RCX: ebea3740fd6de100
RDX: 0000000000000100 RSI: 0000000000000101 RDI: 0000000000000000
RBP: 0000000000000203 R08: ffffc90000a08ae7 R09: 1ffff9200014115c
R10: dffffc0000000000 R11: fffff5200014115d R12: 1ffff1100b6e0712
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f7fd47c16c0(0000) GS:ffff888125102000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7fd385bf28 CR3: 00000000677ea000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __list_del_entry_valid include/linux/list.h:132 [inline]
 __list_del_entry include/linux/list.h:223 [inline]
 list_del_init include/linux/list.h:295 [inline]
 dst_destroy+0x202/0x5a0 net/core/dst.c:163
 rcu_do_batch kernel/rcu/tree.c:2617 [inline]
 rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869
 handle_softirqs+0x22a/0x870 kernel/softirq.c:626
 __do_softirq kernel/softirq.c:660 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:727
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:743
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_cmp4+0x8/0x90 kernel/kcov.c:288
Code: 89 44 11 20 c3 cc cc cc cc cc 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 15 e8 e7 7b 11 65 8b 0d 09 e8 7b 11 81 e1 00 01 ff 00 74
RSP: 0018:ffffc900038f7380 EFLAGS: 00000246
RAX: ffffffff8150c2a0 RBX: ffff8880564be370 RCX: dffffc0000000000
RDX: ffffc9000ce31000 RSI: 0000000040002200 RDI: 0000000080000002
RBP: 0000000040002200 R08: 0000000000000000 R09: 0000000000000003
R10: 0000000000000039 R11: 0000000000000002 R12: 0000000080000002
R13: 0000000000000008 R14: ffffffffffffffff R15: ffff8880564be370
 kvm_find_cpuid_entry2+0xf0/0x370 arch/x86/kvm/cpuid.c:108
 kvm_find_cpuid_entry arch/x86/kvm/cpuid.h:46 [inline]
 kvm_get_hypervisor_cpuid arch/x86/kvm/cpuid.c:215 [inline]
 kvm_set_cpuid+0x1010/0x14e0 arch/x86/kvm/cpuid.c:573
 kvm_vcpu_ioctl_set_cpuid2+0xbe/0x130 arch/x86/kvm/cpuid.c:650
 kvm_arch_vcpu_ioctl+0x15f3/0x2c70 arch/x86/kvm/x86.c:6272
 kvm_vcpu_ioctl+0x7e4/0xfd0 virt/kvm/kvm_main.c:4669
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7fd399c42b
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007f7fd47bf450 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000200000000000 RCX: 00007f7fd399c42b
RDX: 00007f7fd47bfbd0 RSI: 000000004008ae90 RDI: 0000000000000007
RBP: 0000200000001000 R08: 0000000000000008 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000001800
R13: 00007f7fd47bfbd0 R14: 000000000000006b R15: 00000000000000c0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0xdf/0x190 lib/list_debug.c:52
Code: 49 39 1f 0f 85 9e 00 00 00 b0 01 5b 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc cc 48 c7 c7 a0 fc 29 8c 48 89 de e8 42 ee 63 fc 90 <0f> 0b 48 c7 c7 00 fd 29 8c 48 89 de e8 30 ee 63 fc 90 0f 0b 4c 89
RSP: 0018:ffffc90000a08d58 EFLAGS: 00010046
RAX: 0000000000000033 RBX: ffff88805b703890 RCX: ebea3740fd6de100
RDX: 0000000000000100 RSI: 0000000000000101 RDI: 0000000000000000
RBP: 0000000000000203 R08: ffffc90000a08ae7 R09: 1ffff9200014115c
R10: dffffc0000000000 R11: fffff5200014115d R12: 1ffff1100b6e0712
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f7fd47c16c0(0000) GS:ffff888125102000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7fd385bf28 CR3: 00000000677ea000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	89 44 11 20          	mov    %eax,0x20(%rcx,%rdx,1)
   4:	c3                   	ret
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	cc                   	int3
   9:	cc                   	int3
   a:	0f 1f 84 00 00 00 00 	nopl   0x0(%rax,%rax,1)
  11:	00
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	90                   	nop
  1e:	90                   	nop
  1f:	90                   	nop
  20:	90                   	nop
  21:	90                   	nop
  22:	f3 0f 1e fa          	endbr64
  26:	48 8b 04 24          	mov    (%rsp),%rax
* 2a:	65 48 8b 15 e8 e7 7b 	mov    %gs:0x117be7e8(%rip),%rdx        # 0x117be81a <-- trapping instruction
  31:	11
  32:	65 8b 0d 09 e8 7b 11 	mov    %gs:0x117be809(%rip),%ecx        # 0x117be842
  39:	81 e1 00 01 ff 00    	and    $0xff0100,%ecx
  3f:	74                   	.byte 0x74