[TLDR: This mail in primarily relevant for Linux kernel regression tracking. See link in footer if these mails annoy you.] On 04.09.23 15:31, Vlastimil Babka wrote: > On 8/30/23 17:52, Alex Xu (Hello71) wrote: >> Hi all, >> >> Recently "memfd: improve userspace warnings for missing exec-related >> flags" was merged. On my system, this is a regression, not an >> improvement, because the entire 256k kernel log buffer (default on x86) >> is filled with these warnings and "__do_sys_memfd_create: 122 callbacks >> suppressed". I haven't investigated too closely, but the most likely >> cause is Wayland libraries. >> >> This is too serious of a consequence for using an old API, especially >> considering how recently the flags were added. The vast majority of >> software has not had time to add the flags: glibc does not define the >> macros until 2.38 which was released less than one month ago, man-pages >> does not document the flags, and according to Debian Code Search, only >> systemd, stress-ng, and strace actually pass either of these flags. >> >> Furthermore, since old kernels reject unknown flags, it's not just a >> matter of defining and passing the flag; every program needs to >> add logic to handle EINVAL and try again. >> >> Some other way needs to be found to encourage userspace to add the >> flags; otherwise, this message will be patched out because the kernel >> log becomes unusable after running unupdated programs, which will still >> exist even after upstreams are fixed. In particular, AppImages, >> flatpaks, snaps, and similar app bundles contain vendored Wayland >> libraries which can be difficult or impossible to update. > > It's being reverted: > https://lore.kernel.org/all/20230902230530.6B663C433C8@xxxxxxxxxxxxxxx/ in that case: #regzbot fix: revert "memfd: improve userspace warnings for missing exec-related flags". #regzbot ignore-activity Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) -- Everything you wanna know about Linux kernel regression tracking: https://linux-regtracking.leemhuis.info/about/#tldr That page also explains what to do if mails like this annoy you.
