linux-kernel - segmentation faults with kernels >v5.8-rc2

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Message-ID: <CADDKRnAwnLKn5phH_Zxnje_rg10a-uro=H_sNq697G78BTQrkQ@mail.gmail.com>
Date:   Mon, 29 Jun 2020 15:58:50 +0200
From:   Jörg Otte <jrg.otte@...il.com>
To:     Mel Gorman <mgorman@...hsingularity.net>, Jan Kara <jack@...e.cz>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: segmentation faults with kernels >v5.8-rc2

I frequently get segmentation faults in newer kernel >v5.8-rc2 e.g.
Chrome_ChildIOT[1298]: segfault at 40d048 ip 000056111a41970d sp
00007fdced6931b0 error 6 in chrome[561115f64000+785b000]

Bisection gave me the following
first bad commit:

e9c15badbb7b20ccdbadf5da14e0a68fbad51015 is the first bad commit
commit e9c15badbb7b20ccdbadf5da14e0a68fbad51015
Author: Mel Gorman <mgorman@...hsingularity.net>
Date:   Mon Jun 15 13:13:58 2020 +0100

    fs: Do not check if there is a fsnotify watcher on pseudo inodes
...

I double checked by reverting this commit on top of v5.8-rc3 and the
segmentation faults are gone.


Jörg