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* segmentation faults with kernels >v5.8-rc2
@ 2020-06-29 13:58 Jörg Otte
  2020-06-29 18:20 ` Jan Kara
  0 siblings, 1 reply; 2+ messages in thread
From: Jörg Otte @ 2020-06-29 13:58 UTC (permalink / raw)
  To: Mel Gorman, Jan Kara, Linus Torvalds, Linux Kernel Mailing List

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@techsingularity.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

^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: segmentation faults with kernels >v5.8-rc2
  2020-06-29 13:58 segmentation faults with kernels >v5.8-rc2 Jörg Otte
@ 2020-06-29 18:20 ` Jan Kara
  0 siblings, 0 replies; 2+ messages in thread
From: Jan Kara @ 2020-06-29 18:20 UTC (permalink / raw)
  To: Jörg Otte
  Cc: Mel Gorman, Jan Kara, Linus Torvalds, Linux Kernel Mailing List

Hello!

On Mon 29-06-20 15:58:50, Jörg Otte wrote:
> 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@techsingularity.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.

We've already reverted that commit today... Thanks for report!

								Honza
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR

^ permalink raw reply	[flat|nested] 2+ messages in thread

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2020-06-29 13:58 segmentation faults with kernels >v5.8-rc2 Jörg Otte
2020-06-29 18:20 ` Jan Kara

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