On Tue, Sep 05, 2023 at 01:09:05PM -0400, Brian Pardy wrote: > My apologies if I do not have the bug report protocol correct in posting here. > > I've noticed an issue with the CIFS client in kernel 6.5.0/6.5.1 that > does not exist in 6.4.12 or other previous kernels (I have not tested > 6.4.13). Almost immediately after mounting a CIFS share, the reported > load average on my system goes up by 2. At the time this occurs I see > two [cifsd-cfid-laundromat] kernel threads running the "D" state, > where they remain for the entire time the CIFS share is mounted. The > load will remain stable at 2 (otherwise idle) until the share is > unmounted, at which point the [cifsd-cfid-laundromat] threads > disappear and load drops back down to 0. This is easily reproducible > on my system, but I am not sure what to do to retrieve more useful > debugging information. If I mount two shares from this server, I get > four laundromat threads in "D" state and a sustained load average of > 4. > > The client is running Gentoo Linux, the server is a Seagate Personal > Cloud NAS running Samba 4.6.5. Mount options used are > "noperm,guest,vers=3.02". The CPUs do not actually appear to be > spinning, the reported load average appears incorrect as far as actual > CPU use is concerned. > > I am happy to follow any instructions provided to gather more details > if I can help to track this down. Nothing that appears relevant > appears in syslog or dmesg output. Thanks for the regression report. But if you want to get it fixed, you have to do your part: perform bisection. See Documentation/admin-guide/bug-bisect.rst in the kernel sources for how to do that. Anyway, I'm adding it to regzbot: #regzbot ^introduced: v6.4..v6.5 #regzbot title: incorrect CPU utilization report (multiplied) when mounting CIFS Bye! -- An old man doll... just what I always wanted! - Clara
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