Failed to reproduce bugs on the rebuilt Jammy source (not Jammy binary though).
1. String fields like `ruser` are not pointer to a string but a character array (representing a string) in `struct proc_t`. 2. User/group names are filled from UID/GID even if reading `/proc/[PID]/status` fails, normally resulting in the string "root" (uninitialized UID/GID [0] are both recognized as root). 3. Even those names are not touched, they are effectively initialized as an empty string. ** Description changed: I encountered with crashes on top. Reproduced Version: 2:4.0.4-4ubuntu3.2 (noble; Ubuntu 24.04 LTS) - Affected Versions: All currently supported versions (I guess) + Affected Versions (guessed by the reporter): Noble (Ubuntu 24.04 LTS) or later It requires: * A libproc2-0 depending program like `top` (as I encountered) and `ps` (as reported upstream). * Printing certain columns like RUSER is enabled. * On ps, probably non-UTF-8 locale is required (because UTF-8 string processing path workarounds crashes). Still, (as I explain later) this is a race condition issue and for reproduction without patching the program, some randomness is involved (the upstream GitLab issue page provides patching method for reliable crash reproduction). 1. The system should be under high process creation/deletion pressure (where many processed are created and destroyed in a short period of time). 2. On top, reproducibility raises if higher number of processes are printed (i.e. the terminal is large and/or zoomed out) and the delay value (default: 3 seconds) is lower. 3. On ps, set LC_ALL=C to avoid UTF-8-based locales. On upstream, it is found to be a race condition issue on libproc2-0 (cause is discovered by me) and fixed by Jim Warner (the main commit is https://gitlab.com/procps- ng/procps/-/commit/a5708118a4f3184cb5a3e2faa219807e73f007d3). As suggested by Mike Gulick, there may be a possibility synchronizing with Debian (for backporting the fix). cf. https://gitlab.com/procps-ng/procps/-/issues/380 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2120904 Title: top/ps crashes on high process creation/deletion pressure To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/procps/+bug/2120904/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
