This bug was fixed in the package procps - 2:3.3.16-5ubuntu2.1
---------------
procps (2:3.3.16-5ubuntu2.1) groovy; urgency=medium
* Address slowness and crashes with large or unlimited stack limits
(LP: #1874824)
-- William 'jawn-smith' Wilson <william.wil...@canonical.com> Wed, 24
Mar 2021 10:09:08 -0500
** Changed in: procps (Ubuntu Groovy)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1874824
Title:
pgrep reports error "cannot allocate" when run without stack limit
Status in procps package in Ubuntu:
Fix Released
Status in procps source package in Focal:
Fix Committed
Status in procps source package in Groovy:
Fix Released
Status in procps source package in Hirsute:
Fix Released
Status in procps package in Debian:
New
Bug description:
[Impact]
- Users who have ulimit set high would see either slow
or failed pgrep and pkill commands
- Users who have ulimit set to unlimited would see
failed pgrep and pkill commands
- This bug occurs because the behavior of sysconf(_SC_ARG_MAX)
changed with a newer version of the kernel.
[Test Case]
- set the ulimit to unlimited by running `ulimit -S -s unlimited`
- run `pgrep bash` to see that the "cannot allocate" error is
printed and the command has failed.
[Where Problems Could Occur]
- We have set upper and lower limits on the size of the malloc, but
if further kernel versions break the call to sysconf in
unexpected ways we could still see problems.
[Original Description]
If you have no stack limit (ulimit -S -s unlimited), any pgrep call
will fail with an error:
> pgrep vim
pgrep: cannot allocate 4611686018427387903 bytes
If you have a high stack limit (e.g. ulimit -S -s 500000), pgrep is
very slow:
> time pgrep vim
2196
real 8.48s user 8.40s syst 0.07s busy 99% rmem 253444
The relevant upstream bug report could be:
https://gitlab.com/procps-ng/procps/-/issues/152
Archlinux bug report: https://bugs.archlinux.org/task/66093
procps:
Installed: 2:3.3.16-1ubuntu2
500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
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