linux-kernel - Re: [syzbot] [mm?] INFO: task hung in hugetlb

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Message-ID: <c8dffa25-4fb4-486a-9587-1c7359457abc@suse.cz>
Date: Fri, 11 Oct 2024 11:54:05 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: syzbot <syzbot+7bb5e48f6ead66c72906@...kaller.appspotmail.com>,
 akpm@...ux-foundation.org, dvyukov@...gle.com, elver@...gle.com,
 glider@...gle.com, kasan-dev@...glegroups.com, keescook@...omium.org,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org, mcgrof@...nel.org,
 mhiramat@...nel.org, mhocko@...e.com, mike.kravetz@...cle.com,
 muchun.song@...ux.dev, syzkaller-bugs@...glegroups.com,
 torvalds@...ux-foundation.org
Subject: Re: [syzbot] [mm?] INFO: task hung in hugetlb_fault

On 10/10/24 11:54 PM, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit 3db978d480e2843979a2b56f2f7da726f2b295b2
> Author: Vlastimil Babka <vbabka@...e.cz>
> Date:   Mon Jun 8 04:40:24 2020 +0000
> 
>     kernel/sysctl: support setting sysctl parameters from kernel command line

Hi, I see you have a number of sysctl options in CONFIG_CMDLINE
including  sysctl.vm.nr_hugepages=4 which seems necessary to get a
hugetlb_fault. And without the commit above, those sysctl boot options
are not applied. So you'd have to handle sysctl differently to test any
commits earlier than that one.

Thanks,
Vlastimil

> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1499efd0580000
> start commit:   87d6aab2389e Merge tag 'for_linus' of git://git.kernel.org..
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=1699efd0580000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1299efd0580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=fb6ea01107fa96bd
> dashboard link: https://syzkaller.appspot.com/bug?extid=7bb5e48f6ead66c72906
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17dd6327980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16d24f9f980000
> 
> Reported-by: syzbot+7bb5e48f6ead66c72906@...kaller.appspotmail.com
> Fixes: 3db978d480e2 ("kernel/sysctl: support setting sysctl parameters from kernel command line")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection