[Bug 244713] Processes hanging in "nfs" state

2020-03-12 Thread bugzilla-noreply
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244713

Julien Cigar  changed:

   What|Removed |Added

  Flags||mfc-stable12?

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[Bug 244713] Processes hanging in "nfs" state

2020-03-12 Thread bugzilla-noreply
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244713

--- Comment #8 from Julien Cigar  ---
(In reply to Konstantin Belousov from comment #6)

Thanks for your time and analysis..! I can hardly test it on the affected host
unfortunately as it is a production machine, but I'll try to reproduce the
problem on another machine (with a 12-STABLE kernel).

Do you have any idea what could I make to reproduce the problem faster? (It
takes some days on the heavily loaded production machine before it happens)

Are UFS and NFS required to reproduce the issue?

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[Bug 238380] zgrep: Allow multiple options '-e'

2020-03-12 Thread bugzilla-noreply
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238380

Ganael LAPLANCHE  changed:

   What|Removed |Added

 Status|Open|Closed
 Resolution|--- |Not Accepted

--- Comment #4 from Ganael LAPLANCHE  ---
Well, as discussed in the review, the suggested patch does not handle spaces in
file names. It will probably be tricky to work around that problem in shell
without using the eval statement, which would introduce security problems.

So I'll close that PR for now, as it would probably be better to re-implement
the zgrep wrapper in a language more suited for arguments' manipulation.

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[Bug 244713] Processes hanging in "nfs" state

2020-03-12 Thread bugzilla-noreply
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244713

--- Comment #9 from Konstantin Belousov  ---
(In reply to Julien Cigar from comment #8)
It is sendfile over NFS file that triggers the issue.   You need to get into
some very specific layout of cached pages vs. non-cached for this file to get
into the issue.

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[Bug 244713] Processes hanging in "nfs" state

2020-03-12 Thread bugzilla-noreply
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244713

--- Comment #10 from Julien Cigar  ---
(In reply to Konstantin Belousov from comment #9)

OK, I'll try to isolate the webapp, raise the number of worker processes to
something like 1000 and hammer the webapp heavily to reproduce the issue

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[Bug 244713] Processes hanging in "nfs" state

2020-03-12 Thread bugzilla-noreply
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244713

--- Comment #11 from Konstantin Belousov  ---
(In reply to Julien Cigar from comment #10)
If you just increase parallelism but do the sendfile over the same file, I
doubt that the issue is easier to reproduce, quite contrary.  Problem appears
when some pages in the file cache are reclaimed, and then sendfile(2) is called
over the region that contains holes in the cache.  So I would suggest to not
overreact with the parallelism from your app, instead some modest memory
pressure might be more useful.

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