list_del corruption. prev->next should be ffff88019b9af810, but was 000000009b9af810
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:53!
invalid opcode: 0000 [#1] SMP PTI
CPU: 0 PID: 4579 Comm: syz-executor079 Not tainted 4.18.0-rc4+ #26
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid+0x37c/0x440 lib/list_debug.c:51
Code: 48 c7 81 80 0c 00 00 00 00 00 00 c7 81 20 03 00 00 00 00 00 00 48 c7 c7 2e f7 dc 8a 31 c0 48 8b 75 c0 4c 89 e2 e8 a4 ab 2b fd <0f> 0b 66 90 eb fe 44 89 f7 e8 26 60 ae fd e9 88 fd ff ff 48 85 db 
RSP: 0018:ffff880197e3f780 EFLAGS: 00010246
RAX: 0000000000000054 RBX: 0000000000000000 RCX: d9ea9bfe352ded00
RDX: 0000000000000000 RSI: aaaaaaaaaaaab000 RDI: ffffea000cbe9440
RBP: ffff880197e3f7d8 R08: 0000000000480020 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff8675b580 R12: 000000009b9af810
R13: ffff88018abb8270 R14: 00000000ad8000b0 R15: 00000000c32000b1
FS:  000000000110b940(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006d1118 CR3: 00000001c2668000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __list_del_entry include/linux/list.h:117 [inline]
 list_del_rcu include/linux/rculist.h:130 [inline]
 __free_vmap_area+0x2f5/0x650 mm/vmalloc.c:575
 __purge_vmap_area_lazy+0x2c1/0x3b0 mm/vmalloc.c:683
 try_purge_vmap_area_lazy mm/vmalloc.c:698 [inline]
 free_vmap_area_noflush+0x1fa/0x230 mm/vmalloc.c:730
 free_unmap_vmap_area mm/vmalloc.c:743 [inline]
 remove_vm_area+0x3b9/0x460 mm/vmalloc.c:1491
 __vunmap+0x34c/0x5d0 mm/vmalloc.c:1519
 vfree+0x79/0x170 mm/vmalloc.c:1594
 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:870 [inline]
 get_entries net/ipv4/netfilter/ip_tables.c:1027 [inline]
 do_ipt_get_ctl+0x1150/0x11e0 net/ipv4/netfilter/ip_tables.c:1703
 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline]
 nf_getsockopt+0x481/0x4e0 net/netfilter/nf_sockopt.c:122
 ip_getsockopt+0x297/0x3f0 net/ipv4/ip_sockglue.c:1574
 tcp_getsockopt+0x1c6/0x1f0 net/ipv4/tcp.c:3545
 sock_common_getsockopt+0x13f/0x180 net/core/sock.c:2999
 __sys_getsockopt+0x48c/0x550 net/socket.c:1948
 __do_sys_getsockopt net/socket.c:1959 [inline]
 __se_sys_getsockopt net/socket.c:1956 [inline]
 __x64_sys_getsockopt+0x15d/0x1c0 net/socket.c:1956
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x44766a
Code: b8 10 01 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 1d d6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 fa d5 fb ff c3 66 0f 1f 84 00 00 00 00 00 
RSP: 002b:00000000007ef698 EFLAGS: 00000216 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00000000006d4d40 RCX: 000000000044766a
RDX: 0000000000000041 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00000000006d4d40 R08: 00000000007ef6bc R09: 0000000000004000
R10: 00000000007ef7c0 R11: 0000000000000216 R12: 0000000000000003
R13: 00000000007ef7c0 R14: 00000000007ef6c0 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace 46e1ffa8321b0cf6 ]---
RIP: 0010:__list_del_entry_valid+0x37c/0x440 lib/list_debug.c:51
Code: 48 c7 81 80 0c 00 00 00 00 00 00 c7 81 20 03 00 00 00 00 00 00 48 c7 c7 2e f7 dc 8a 31 c0 48 8b 75 c0 4c 89 e2 e8 a4 ab 2b fd <0f> 0b 66 90 eb fe 44 89 f7 e8 26 60 ae fd e9 88 fd ff ff 48 85 db 
RSP: 0018:ffff880197e3f780 EFLAGS: 00010246
RAX: 0000000000000054 RBX: 0000000000000000 RCX: d9ea9bfe352ded00
RDX: 0000000000000000 RSI: aaaaaaaaaaaab000 RDI: ffffea000cbe9440
RBP: ffff880197e3f7d8 R08: 0000000000480020 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff8675b580 R12: 000000009b9af810
R13: ffff88018abb8270 R14: 00000000ad8000b0 R15: 00000000c32000b1
FS:  000000000110b940(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006d1118 CR3: 00000001c2668000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400