linux-kernel - Re: [syzbot] kernel BUG in dev_args_match

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Date:   Thu, 3 Nov 2022 00:08:28 +0100
From:   David Sterba <dsterba@...e.cz>
To:     syzbot <syzbot+031687116258450f9853@...kaller.appspotmail.com>
Cc:     clm@...com, dsterba@...e.com, josef@...icpanda.com,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] kernel BUG in dev_args_match_device

On Wed, Nov 02, 2022 at 11:06:42AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    b229b6ca5abb Merge tag 'perf-tools-fixes-for-v6.1-2022-10-..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1744c1fc880000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=1d3548a4365ba17d
> dashboard link: https://syzkaller.appspot.com/bug?extid=031687116258450f9853
> compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
> 
> Unfortunately, I don't have any reproducer for this issue yet.
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/24728b72a896/disk-b229b6ca.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/10a3c40c60e1/vmlinux-b229b6ca.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/69f963b02b7e/bzImage-b229b6ca.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+031687116258450f9853@...kaller.appspotmail.com
> 
> ------------[ cut here ]------------
> kernel BUG at fs/btrfs/ctree.h:3710!

This is cut just before the assertion failed message but it's in the
full console log:

[ 1143.555887][ T2686] assertion failed: (args->devid != (u64)-1) || args->missing, in fs/btrfs/volumes.c:6921

6918 static bool dev_args_match_device(const struct btrfs_dev_lookup_args *args,                                                                                                                                     
6919                                   const struct btrfs_device *device)                                                                                                                                            
6920 {                                                                                                                                                                                                               
6921         ASSERT((args->devid != (u64)-1) || args->missing);