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Groups > linux.debian.bugs.dist > #889455

Bug#893935: /lib/modules/4.9.0-6-amd64/kernel/drivers/mmc/host/rtsx_usb_sdmmc.ko: Idle load from rmmod rtsx_usb_sdmmc

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Control: severity -1 normal
Control: tag -1 upstream

On Sat, 2018-03-24 at 04:51 +0100, Tomasz Warniełło wrote:
> Package: src:linux
> Version: 4.9.82-1+deb9u3
> Severity: important
> File: /lib/modules/4.9.0-6-amd64/kernel/drivers/mmc/host/rtsx_usb_sdmmc.ko
> 
> Dear Maintainer,
> 
> I observed high load in idle system in `top`. The load was ca. 2.00, the CPU i5.
> I checked i/o and net and didn't find load. There were always 3 processes in the D state:
> two kworkers and rtsx_usb_ms_1. I did `rmmod rtsx_usb_ms`, which didn't help,
> but then I did `rmmod rtsx_usb_sdmmc` and the load went down to 0.00.
> 
> The situation is also described here:
> https://unix.stackexchange.com/questions/433052/high-load-on-i5-with-no-visible-reason/433192#433192
[...]

D state means uninterruptible sleep (i.e. they are waiting for
something and can't be interrupted by signals).  For historical reasons
Linux counts tasks in D state the same as tasks in R state when
calculating CPU load, but it doesn't mean they're using any CPU time.

These drivers should probably be using schedule_timeout_idle() to avoid
the confusing behaviour.  (I already made that change in one place in
rtsx_usb_ms.)

Ben.

-- 
Ben Hutchings
When in doubt, use brute force. - Ken Thompson

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Bug#893935: /lib/modules/4.9.0-6-amd64/kernel/drivers/mmc/host/rtsx_usb_sdmmc.ko: Idle load from rmmod rtsx_usb_sdmmc Tomasz Warniełło <tomasz.warniello@gmail.com> - 2018-03-24 05:00 +0100
  Bug#893935: /lib/modules/4.9.0-6-amd64/kernel/drivers/mmc/host/rtsx_usb_sdmmc.ko: Idle load from rmmod rtsx_usb_sdmmc Ben Hutchings <ben@decadent.org.uk> - 2018-03-26 19:00 +0200

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