linux-kernel - Re: [PATCH] mm: Fix mmap_assert_locked() in follow

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Message-ID: <20240712121800.3049-1-spasswolf@web.de>
Date: Fri, 12 Jul 2024 14:17:58 +0200
From: Bert Karwatzki <spasswolf@....de>
To: Pei Li <peili.dev@...il.com>
Cc: Bert Karwatzki <spasswolf@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Shuah Khan <skhan@...uxfoundation.org>,
	David Hildenbrand <david@...hat.com>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	linux-next@...r.kernel.org,
	syzbot+35a4414f6e247f515443@...kaller.appspotmail.com,
	syzkaller-bugs@...glegroups.com,
	linux-kernel-mentees@...ts.linuxfoundation.org,
	senozhatsky@...omium.org
Subject: Re: [PATCH] mm: Fix mmap_assert_locked() in follow_pte()

This is causing a deadlock for me, too. Since linux-next-20240712 I observe
a hang when starting the gui. I bisected this to commit a13252049629 and
reverting this commit in linux-next-20240712 fixes the issue for me.
I do not have any log messages to prove the dead lock, though, as I compiled
everything without CONFIG_LOCKDEP.

Bert Karwatzki