Re: Possible bug report: kernel 6.5.0/6.5.1 high load when CIFS share is mounted (cifsd-cfid-laundromat in"D" state)

[Linux regression tracking #update (Thorsten Leemhuis)]

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On 06.09.23 23:03, Brian Pardy wrote:
> Added committer Ronnie Sahlberg to CC.
> 
> On Tue, Sep 5, 2023 at 9:01 PM Bagas Sanjaya <bagasdotme@xxxxxxxxx> wrote:
>> On Tue, Sep 05, 2023 at 01:09:05PM -0400, Brian Pardy wrote:
>>> 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.
> [...]
> 
> Thank you for directing me to the bug-bisect documentation. Results below:
> 
> # git bisect bad
> d14de8067e3f9653cdef5a094176d00f3260ab20 is the first bad commit
>

#regzbot ^introduced: d14de8067e3f9653cdef5a094176d00f3260a
#regzbot ignore-activity

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
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