Re: [syzbot] [mm?] INFO: task hung in hugetlb_fault

[Vlastimil Babka]

On 10/10/24 11:54 PM, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit 3db978d480e2843979a2b56f2f7da726f2b295b2
> Author: Vlastimil Babka <vbabka@xxxxxxx>
> 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@xxxxxxxxxxxxxxxxxxxxxxxxx
> Fixes: 3db978d480e2 ("kernel/sysctl: support setting sysctl parameters from kernel command line")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection