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    SubjectRe: [syzbot] WARNING in __vunmap
    From
    syzbot has found a reproducer for the following issue on:

    HEAD commit: d5ad8ec3cfb5 Merge tag 'media/v5.14-2' of git://git.kernel..
    git tree: upstream
    console output: https://syzkaller.appspot.com/x/log.txt?x=1669619a300000
    kernel config: https://syzkaller.appspot.com/x/.config?x=343fd21f6f4da2d6
    dashboard link: https://syzkaller.appspot.com/bug?extid=5ec9bb042ddfe9644773
    compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
    syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11c3f142300000
    C reproducer: https://syzkaller.appspot.com/x/repro.c?x=154e2121300000

    IMPORTANT: if you fix the issue, please add the following tag to the commit:
    Reported-by: syzbot+5ec9bb042ddfe9644773@syzkaller.appspotmail.com

    ------------[ cut here ]------------
    Trying to vfree() nonexistent vm area (ffffc90002bc9000)
    WARNING: CPU: 0 PID: 8497 at mm/vmalloc.c:2567 __vunmap+0x150/0xb70 mm/vmalloc.c:2567
    Modules linked in:
    CPU: 1 PID: 8497 Comm: syz-executor174 Not tainted 5.14.0-rc4-syzkaller #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
    RIP: 0010:__vunmap+0x150/0xb70 mm/vmalloc.c:2567
    Code: 85 78 ff ff ff e8 20 b0 c4 ff 48 c7 c7 c0 7c a9 8b e8 44 ed 7b 07 e8 0f b0 c4 ff 4c 89 e6 48 c7 c7 e0 bb 96 89 e8 c1 05 37 07 <0f> 0b 48 83 c4 38 5b 5d 41 5c 41 5d 41 5e 41 5f e9 eb af c4 ff e8
    RSP: 0018:ffffc900023b72d8 EFLAGS: 00010286
    RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
    RDX: ffff888028c00000 RSI: ffffffff815d7935 RDI: fffff52000476e4d
    RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
    R10: ffffffff815d176e R11: 0000000000000000 R12: ffffc90002bc9000
    R13: ffff8880253d20c0 R14: ffffc90002bc9000 R15: ffffe8ffffc338a8
    FS: 00007fcdcc063700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 00007fcdcc084718 CR3: 00000000159f1000 CR4: 00000000001506f0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    Call Trace:
    __vfree+0x3c/0xd0 mm/vmalloc.c:2635
    vfree+0x5a/0x90 mm/vmalloc.c:2666
    ipcomp_free_scratches+0xc4/0x160 net/xfrm/xfrm_ipcomp.c:203
    ipcomp_free_data net/xfrm/xfrm_ipcomp.c:312 [inline]
    ipcomp_init_state+0x77c/0xa40 net/xfrm/xfrm_ipcomp.c:364
    ipcomp6_init_state+0xc2/0x700 net/ipv6/ipcomp6.c:154
    __xfrm_init_state+0x995/0x15c0 net/xfrm/xfrm_state.c:2648
    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:2504
    xfrm_netlink_rcv+0x6b/0x90 net/xfrm/xfrm_user.c:2824
    netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
    netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340
    netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929
    sock_sendmsg_nosec net/socket.c:703 [inline]
    sock_sendmsg+0xcf/0x120 net/socket.c:723
    ____sys_sendmsg+0x6e8/0x810 net/socket.c:2392
    ___sys_sendmsg+0xf3/0x170 net/socket.c:2446
    __sys_sendmsg+0xe5/0x1b0 net/socket.c:2475
    do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    entry_SYSCALL_64_after_hwframe+0x44/0xae
    RIP: 0033:0x445b99
    Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
    RSP: 002b:00007fcdcc063318 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
    RAX: ffffffffffffffda RBX: 00000000004ca428 RCX: 0000000000445b99
    RDX: 0000000000000000 RSI: 0000000020000800 RDI: 0000000000000004
    RBP: 00000000004ca420 R08: 0000000000000000 R09: 0000000000000000
    R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004ca42c
    R13: 00007ffec83642cf R14: 00007fcdcc063400 R15: 0000000000022000

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