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bug#40023: 26.3; Emacs crashes when creating process if many file handle
From: |
Robert Pluim |
Subject: |
bug#40023: 26.3; Emacs crashes when creating process if many file handles are in use (e.g., when using ccls) |
Date: |
Wed, 11 Mar 2020 16:32:14 +0100 |
>>>>> On Wed, 11 Mar 2020 13:50:22 +0000, Holger Pirk <holger@pirk.name> said:
Holger> I have spent some time digging around the code and couldn't quite
figure
Holger> out the logic behind the `fd < FD_SETSIZE`-assert. I suspect the
CCLS
Holger> opens files without going through emacs' infrastructure which leads
to
Holger> high file descriptors which emacs cannot handle. I would say that
CCLS
Holger> is, in part, to blame but emacs shouldn't simply crash.
Emacs is limited by the limits of select, which supports a maximum of
FD_SETSIZE file descriptors, which on macOS is 1024
At least on macOS, itʼs possible to increase that value to eg 8192 by
setting FD_SETSIZE, which might alleviate this, but then you'd
probably run into the 'ulimit -n' maximum, so you'd have to remember
to increase that.
Using 'poll' would help, but as far as I know nobody is working on
converting emacs to use it.
It would be interesting to see how CCLS opens files. How does it pass
the descriptor back to emacs?
Robert
- bug#40023: 26.3; Emacs crashes when creating process if many file handles are in use (e.g., when using ccls), Holger Pirk, 2020/03/11
- bug#40023: 26.3; Emacs crashes when creating process if many file handles are in use (e.g., when using ccls),
Robert Pluim <=
- bug#40023: 26.3; Emacs crashes when creating process if many file handles are in use (e.g., when using ccls), Eli Zaretskii, 2020/03/11
- bug#40023: 26.3; Emacs crashes when creating process if many file handles are in use (e.g., when using ccls), Robert Pluim, 2020/03/12
- bug#40023: 26.3; Emacs crashes when creating process if many file handles are in use (e.g., when using ccls), Eli Zaretskii, 2020/03/12
- bug#40023: 26.3; Emacs crashes when creating process if many file handles are in use (e.g., when using ccls), Robert Pluim, 2020/03/12
- bug#40023: 26.3; Emacs crashes when creating process if many file handles are in use (e.g., when using ccls), Eli Zaretskii, 2020/03/12
- bug#40023: 26.3; Emacs crashes when creating process if many file handles are in use (e.g., when using ccls), Robert Pluim, 2020/03/12
- bug#40023: 26.3; Emacs crashes when creating process if many file handles are in use (e.g., when using ccls), Robert Pluim, 2020/03/19
- bug#40023: 26.3; Emacs crashes when creating process if many file handles are in use (e.g., when using ccls), Eli Zaretskii, 2020/03/19