linux-kernel - Re: [syzbot] [kernel?] possible deadlock in scheduler

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ecba318b-7452-92d0-4a2f-2f6c9255f771@I-love.SAKURA.ne.jp>
Date:   Sat, 20 May 2023 20:02:25 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     syzbot <syzbot+ece2915262061d6e0ac1@...kaller.appspotmail.com>,
        syzkaller-bugs@...glegroups.com,
        Mel Gorman <mgorman@...hsingularity.net>,
        "Huang, Ying" <ying.huang@...el.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>
Cc:     kasan-dev <kasan-dev@...glegroups.com>,
        linux-mm <linux-mm@...ck.org>
Subject: Re: [syzbot] [kernel?] possible deadlock in scheduler_tick (2)

This looks same pattern with https://lkml.kernel.org/r/6577e1fa-b6ee-f2be-2414-a2b51b1c5e30@I-love.SAKURA.ne.jp .
I think stackdepot needs to drop __GFP_KSWAPD_RECLAIM as well as debugobject did.

Like I wrote at https://lore.kernel.org/linux-mm/d642e597-cf7d-b410-16ce-22dff483fd8e@I-love.SAKURA.ne.jp/ ,
I wish that GFP_ATOMIC / GFP_NOWAIT do not imply __GFP_KSWAPD_RECLAIM...

On 2023/05/20 17:26, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    f1fcbaa18b28 Linux 6.4-rc2
> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
> console output: https://syzkaller.appspot.com/x/log.txt?x=1332a029280000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3dc1cdd68141cdc3
> dashboard link: https://syzkaller.appspot.com/bug?extid=ece2915262061d6e0ac1
> compiler:       Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
> userspace arch: arm64
> 
> Unfortunately, I don't have any reproducer for this issue yet.
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/f9e1748cceea/disk-f1fcbaa1.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/6dea99343621/vmlinux-f1fcbaa1.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/f5a93f86012d/Image-f1fcbaa1.gz.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+ece2915262061d6e0ac1@...kaller.appspotmail.com