------------[ cut here ]------------
Trying to vfree() nonexistent vm area (ffffc9000b589000)
WARNING: CPU: 1 PID: 10600 at mm/vmalloc.c:2554 __vunmap+0x150/0xb60 mm/vmalloc.c:2554
Modules linked in:
CPU: 1 PID: 10600 Comm: syz-executor.1 Not tainted 5.12.0-rc5-next-20210401-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__vunmap+0x150/0xb60 mm/vmalloc.c:2554
Code: 85 78 ff ff ff e8 10 c3 c5 ff 48 c7 c7 a0 ed 08 8c e8 04 cc 61 07 e8 ff c2 c5 ff 4c 89 e6 48 c7 c7 a0 5f 76 89 e8 71 0e 1e 07 <0f> 0b 48 83 c4 38 5b 5d 41 5c 41 5d 41 5e 41 5f e9 db c2 c5 ff e8
RSP: 0018:ffffc9000b5472e8 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8880405b8000 RSI: ffffffff815c1cc5 RDI: fffff520016a8e4f
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff815bbb2e R11: 0000000000000000 R12: ffffc9000b589000
R13: ffff888023f8a540 R14: ffffc9000b589000 R15: ffffe8ffffc8da48
FS:  00007f0216694700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe32dcab000 CR3: 000000002af3f000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __vfree+0x3c/0xd0 mm/vmalloc.c:2621
 vfree+0x5a/0x90 mm/vmalloc.c:2652
 ipcomp_free_scratches+0xc4/0x160 net/xfrm/xfrm_ipcomp.c:212
 ipcomp_free_data net/xfrm/xfrm_ipcomp.c:321 [inline]
 ipcomp_init_state+0x77c/0xa40 net/xfrm/xfrm_ipcomp.c:373
 ipcomp4_init_state+0xc2/0x8e0 net/ipv4/ipcomp.c:134
 __xfrm_init_state+0x9c8/0x15b0 net/xfrm/xfrm_state.c:2606
 xfrm_state_construct net/xfrm/xfrm_user.c:627 [inline]
 xfrm_add_sa+0x1ef1/0x35f0 net/xfrm/xfrm_user.c:684
 xfrm_user_rcv_msg+0x42c/0x8b0 net/xfrm/xfrm_user.c:2812
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502
 xfrm_netlink_rcv+0x6b/0x90 net/xfrm/xfrm_user.c:2824
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:674
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x466459
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0216694188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000466459
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000003
RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008
R13: 00007ffe902abacf R14: 00007f0216694300 R15: 0000000000022000