linux-kernel - Re: [syzbot] BUG: unable to handle kernel paging request in corrupted (3)

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Message-ID: <a6a87693-f994-6e56-78a2-6e39e1060484@gmail.com>
Date:   Mon, 17 May 2021 12:21:33 +0100
From:   Pavel Begunkov <asml.silence@...il.com>
To:     syzbot <syzbot+a84b8783366ecb1c65d0@...kaller.appspotmail.com>,
        axboe@...nel.dk, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] BUG: unable to handle kernel paging request in corrupted
 (3)

On 5/17/21 10:22 AM, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    88b06399 Merge tag 'for-5.13-rc1-part2-tag' of git://git.k..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=11aa7a65d00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=807beec6b4d66bf1
> dashboard link: https://syzkaller.appspot.com/bug?extid=a84b8783366ecb1c65d0
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16a031b3d00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12fc54fdd00000
> 
> The issue was bisected to:

#syz test: https://github.com/isilence/linux.git syz_test10

> 
> commit ea6a693d862d4f0edd748a1fa3fc6faf2c39afb2
> Author: Jens Axboe <axboe@...nel.dk>
> Date:   Thu Apr 15 15:47:13 2021 +0000
> 
>     io_uring: disable multishot poll for double poll add cases
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=104b5795d00000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=124b5795d00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=144b5795d00000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+a84b8783366ecb1c65d0@...kaller.appspotmail.com
> Fixes: ea6a693d862d ("io_uring: disable multishot poll for double poll add cases")
> 
> BUG: unable to handle page fault for address: ffffffffc1defce0
> #PF: supervisor instruction fetch in kernel mode
> #PF: error_code(0x0010) - not-present page
> PGD bc8f067 P4D bc8f067 PUD bc91067 PMD 0 
> Oops: 0010 [#1] PREEMPT SMP KASAN
> CPU: 1 PID: 8479 Comm: iou-wrk-8440 Not tainted 5.13.0-rc1-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> RIP: 0010:0xffffffffc1defce0
> Code: Unable to access opcode bytes at RIP 0xffffffffc1defcb6.
> RSP: 0018:ffffc9000161f8f8 EFLAGS: 00010246
> RAX: ffffffffc1defce0 RBX: 0000000000000000 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880187eb8c0
> RBP: ffff8880187eb8c0 R08: 0000000000000000 R09: 0000000000002000
> R10: ffffffff81df1723 R11: 0000000000004000 R12: 0000000000000000
> R13: ffff8880187eb918 R14: ffff8880187eb900 R15: ffffffffc1defce0
> FS:  0000000001212300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffffffc1defcb6 CR3: 00000000139d9000 CR4: 00000000001506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> Modules linked in:
> CR2: ffffffffc1defce0
> ---[ end trace a41da77ef833bc79 ]---
> RIP: 0010:0xffffffffc1defce0
> Code: Unable to access opcode bytes at RIP 0xffffffffc1defcb6.
> RSP: 0018:ffffc9000161f8f8 EFLAGS: 00010246
> RAX: ffffffffc1defce0 RBX: 0000000000000000 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880187eb8c0
> RBP: ffff8880187eb8c0 R08: 0000000000000000 R09: 0000000000002000
> R10: ffffffff81df1723 R11: 0000000000004000 R12: 0000000000000000
> R13: ffff8880187eb918 R14: ffff8880187eb900 R15: ffffffffc1defce0
> FS:  0000000001212300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffffffc1defcb6 CR3: 00000000139d9000 CR4: 00000000001506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> 
> 
> ---
> This report 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 issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> syzbot can test patches for this issue, for details see:
> https://goo.gl/tpsmEJ#testing-patches
> 

-- 
Pavel Begunkov