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bug#17561: Emacs can forget processes

From: Paul Eggert
Subject: bug#17561: Emacs can forget processes
Date: Sat, 24 May 2014 16:01:20 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0

Jorgen Schaefer wrote:

Can you run the shell command 'strace -p' on an Emacs with the
problem, and trace the system calls near the offending area?

The bug report includes an strace output. Emacs does the pselect6 call

Sorry, I should have been more specific. It'd be nice to see the strace output for when you run start-process in a temp buffer, not for later when Emacs is in a tight loop.

read(2) returning 0 indicates an EOF (which pselect6 indicates as
waiting input), I suspect there could at least be a sanity check here
to close the file descriptors instead of continuously polling.

Maybe, though I worry that might mask the bug and might cause other, more serious failures down the road. It'd be nicer to fix the actual bug, if we can figure out what it is.

For what it's worth I tried reproducing the bug with emacs-24 'emacs -Q' on Fedora, using your recipe, but this didn't have a problem. I ran it 1000 times rapidly in sequence and it was OK. I ran it 10000 times and ran out of file descriptors but that's to be expected.

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