linux-kernel - Re: general protection fault in unlink_file

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Message-ID: <00000000000047239b05af66a31c@google.com>
Date:   Tue, 15 Sep 2020 21:24:04 -0700
From:   syzbot <syzbot+c5d5a51dcbb558ca0cb5@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, hdanton@...a.com, linmiaohe@...wei.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: general protection fault in unlink_file_vma

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