linux-kernel - Re: [syzbot] possible deadlock in ext4_xattr

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Date:   Mon, 8 Aug 2022 21:48:08 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     syzbot <syzbot+62120febbd1ee3c3c860@...kaller.appspotmail.com>
Cc:     hdanton@...a.com, linux-kernel@...r.kernel.org,
        linux-ext4@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] possible deadlock in ext4_xattr_get

On Mon, Aug 08, 2022 at 06:03:12PM -0700, syzbot wrote:
> Hello,
> 
> syzbot has tested the proposed patch and the reproducer did not trigger any issue:
> 
> Reported-and-tested-by: syzbot+62120febbd1ee3c3c860@...kaller.appspotmail.com
> 
> Tested on:
> 
> commit:         cb71b93c Add linux-next specific files for 20220628
> git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> console output: https://syzkaller.appspot.com/x/log.txt?x=12afd10e080000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=badbc1adb2d582eb
> dashboard link: https://syzkaller.appspot.com/bug?extid=62120febbd1ee3c3c860
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> patch:          https://syzkaller.appspot.com/x/patch.diff?x=104ed896080000
> 

Hi Hillf,

Thanks for looking at this.  For some reason, your e-mails with the
patch are available on the syzkaller-bugs google groups archive.  For
example:

https://groups.google.com/g/syzkaller-bugs/c/NgC9hA3GX_Q/m/vVqsx8KTBQAJ

But even though your messages appear to be cc'ed to linux-kernel, I'm
not seeing your messages on lore.kernel.org's mail archives.  (wWith
apologies to Lewis Caroll) "Curiouser and curiouser...."

This makes me worried that somehow some or all of your messages to
linux-ext4@ or linux-kernel@ on this matter are somehow getting lost.
We see syzkaller's reply to your messages, and anything that you've
cc'ed to syzkaller-bugs@...glegroups.com is available archived on
Google Groups.  However, if there were any other messages that you
have sent, they may have been unseed by anyone else.  :-(

If you could send a patch with a full description and the appropriate
Fixes: and CC: stable tags, could you make sure that you explicitly Cc
me, just in case something is funny going on with your e-mails to
mailing lists at vger.kernel.org?

Many thanks!

						- Ted