linux-kernel - Re: BUG: unable to handle kernel paging request in xfs_sb_read

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Message-ID: <CACT4Y+aQic2aM1gPOp_1Nh0ydAeeJk=KVbRZJpo9S1Zdt7SuzQ@mail.gmail.com>
Date:   Sat, 30 Nov 2019 08:58:30 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+6be2cbddaad2e32b47a0@...kaller.appspotmail.com>,
        Daniel Axtens <dja@...ens.net>,
        kasan-dev <kasan-dev@...glegroups.com>
Cc:     allison.henderson@...cle.com, Brian Foster <bfoster@...hat.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>, dchinner@...hat.com,
        LKML <linux-kernel@...r.kernel.org>,
        linux-xfs <linux-xfs@...r.kernel.org>, sandeen@...hat.com,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: BUG: unable to handle kernel paging request in xfs_sb_read_verify

On Sat, Nov 30, 2019 at 8:57 AM syzbot
<syzbot+6be2cbddaad2e32b47a0@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    419593da Add linux-next specific files for 20191129
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=10cecb36e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=7c04b0959e75c206
> dashboard link: https://syzkaller.appspot.com/bug?extid=6be2cbddaad2e32b47a0
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
>
> Unfortunately, I don't have any reproducer for this crash yet.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+6be2cbddaad2e32b47a0@...kaller.appspotmail.com

+Daniel, kasan-dev
This is presumably from the new CONFIG_KASAN_VMALLOC


> BUG: unable to handle page fault for address: fffff52002e00000
> #PF: supervisor read access in kernel mode
> #PF: error_code(0x0000) - not-present page
> PGD 21ffee067 P4D 21ffee067 PUD aa11c067 PMD 0
> Oops: 0000 [#1] PREEMPT SMP KASAN
> CPU: 0 PID: 2938 Comm: kworker/0:2 Not tainted
> 5.4.0-next-20191129-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Workqueue: xfs-buf/loop3 xfs_buf_ioend_work
> RIP: 0010:xfs_sb_read_verify+0xf0/0x540 fs/xfs/libxfs/xfs_sb.c:691
> Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 18 04 00 00 4d 8b ac 24 30 01
> 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 04 02 84
> c0 74 08 3c 03 0f 8e a7 03 00 00 41 8b 75 00 bf 58
> RSP: 0018:ffffc90007e5faf0 EFLAGS: 00010a06
> RAX: dffffc0000000000 RBX: 1ffff92000fcbf61 RCX: ffffffff82acb516
> RDX: 1ffff92002e00000 RSI: ffffffff82a97e3b RDI: ffff888091bada60
> RBP: ffffc90007e5fcd0 R08: ffff88809f3c2040 R09: ffffed1015cc7045
> R10: ffffed1015cc7044 R11: ffff8880ae638223 R12: ffff888091bad940
> R13: ffffc90017000000 R14: ffffc90007e5fca8 R15: ffff88809feb8000
> FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: fffff52002e00000 CR3: 0000000069ceb000 CR4: 00000000001406f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>   xfs_buf_ioend+0x3f9/0xde0 fs/xfs/xfs_buf.c:1162
>   xfs_buf_ioend_work+0x19/0x20 fs/xfs/xfs_buf.c:1183
>   process_one_work+0x9af/0x1740 kernel/workqueue.c:2264
>   worker_thread+0x98/0xe40 kernel/workqueue.c:2410
>   kthread+0x361/0x430 kernel/kthread.c:255
>   ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
> Modules linked in:
> CR2: fffff52002e00000
> ---[ end trace aef83d995322cc4a ]---
> RIP: 0010:xfs_sb_read_verify+0xf0/0x540 fs/xfs/libxfs/xfs_sb.c:691
> Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 18 04 00 00 4d 8b ac 24 30 01
> 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 04 02 84
> c0 74 08 3c 03 0f 8e a7 03 00 00 41 8b 75 00 bf 58
> RSP: 0018:ffffc90007e5faf0 EFLAGS: 00010a06
> RAX: dffffc0000000000 RBX: 1ffff92000fcbf61 RCX: ffffffff82acb516
> RDX: 1ffff92002e00000 RSI: ffffffff82a97e3b RDI: ffff888091bada60
> RBP: ffffc90007e5fcd0 R08: ffff88809f3c2040 R09: ffffed1015cc7045
> R10: ffffed1015cc7044 R11: ffff8880ae638223 R12: ffff888091bad940
> R13: ffffc90017000000 R14: ffffc90007e5fca8 R15: ffff88809feb8000
> FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: fffff52002e00000 CR3: 0000000069ceb000 CR4: 00000000001406f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
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