** Description changed:
+ [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+ changed with a newer version of the kernel.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
+ Installed: 2:3.3.16-1ubuntu2
+ 500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
** Changed in: procps (Ubuntu Hirsute)
Status: Triaged => In Progress
** Changed in: procps (Ubuntu Groovy)
Status: Confirmed => In Progress
** Changed in: procps (Ubuntu Focal)
Status: Confirmed => In Progress
** Changed in: procps (Ubuntu Hirsute)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1874824
Title:
pgrep reports error "cannot allocate" when run without stack limit
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