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SubjectRe: general protection fault in unlink_file_vma
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Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel panic: Fatal exception

RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffd30630720 R11: 0000000000000000 R12: 000000000118d940
R13: 000000000118d940 R14: ffffffffffffffff R15: 000000000118cfec
FS: 0000000001b47940(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS: 0033 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001590004 CR3: 0000000021097000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Kernel panic - not syncing: Fatal exception
Kernel Offset: disabled


Tested on:

commit: 8f79400b fix vma_merge gpf
git tree: https://github.com/Linmiaohe/linux vma_merge_fix
console output: https://syzkaller.appspot.com/x/log.txt?x=153b1d43900000
kernel config: https://syzkaller.appspot.com/x/.config?x=3c5f6ce8d5b68299
dashboard link: https://syzkaller.appspot.com/bug?extid=c5d5a51dcbb558ca0cb5
compiler: gcc (GCC) 10.1.0-syz 20200507

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