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

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Message-Id: <20240126012540.045d8521de02fab64f3cbf78@linux-foundation.org>
Date: Fri, 26 Jan 2024 01:25:40 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: syzbot <syzbot+a1deb5533794ff31868e@...kaller.appspotmail.com>
Cc: leitao@...ian.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 muchun.song@...ux.dev, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] possible deadlock in __unmap_hugepage_range

On Fri, 26 Jan 2024 01:04:29 -0800 syzbot <syzbot+a1deb5533794ff31868e@...kaller.appspotmail.com> wrote:

> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    8bf1262c53f5 Add linux-next specific files for 20240124
> git tree:       linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=1218a7abe80000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=ff4b59a824278780
> dashboard link: https://syzkaller.appspot.com/bug?extid=a1deb5533794ff31868e
> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=151a9cf7e80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=164b70cfe80000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/7696d711072d/disk-8bf1262c.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/92cd47c28072/vmlinux-8bf1262c.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/add5c7493418/bzImage-8bf1262c.xz
> 
> The issue was bisected to:
> 
> commit 947b031634e7af3d265275c26ec17e2f96fdb5a1
> Author: Breno Leitao <leitao@...ian.org>
> Date:   Wed Jan 17 17:10:57 2024 +0000
> 
>     mm/hugetlb: restore the reservation if needed

Thanks.  But moments after I moved this into mm.git's
mm-hotfixes-stable branch, in preparation for upstreaming.

I have fully dropped the patches titled

	mm/hugetlb: restore the reservation if needed
	selftests/mm: run_vmtests.sh: add hugetlb_madv_vs_map