** Package changed: linux (Ubuntu) => blktrace (Ubuntu)
** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1692907
Title:
blktrace: ziomon FAILED to start thread on CPU x: 22/Invalid argument
Status in Ubuntu on IBM z Systems:
New
Status in blktrace package in Ubuntu:
New
Bug description:
> ---Problem Description---
> Getting the following error during ziomon execution:
>
> ziomon -i 2 -d 1 -l 1M -o ziomonlog /dev/sdb /dev/sda
> Check devices...done
> Estimated maximum disk space required for log data: approx. <1 MBytes
> Collecting configuration data...done
> Start data collection processes...done
> Collecting data...FAILED to start thread on CPU 6: 22/Invalid argument
> FAILED to start thread on CPU 7: 22/Invalid argument
> FAILED to start thread on CPU 8: 22/Invalid argument
> FAILED to start thread on CPU 9: 22/Invalid argument
Could you ensure that the cpuplugd is not running while using ziomon?
== >Yes, cpuplugd is not running during ziomon execution.
I have also called blktrace directly and got the same errors:
s35lp49:~ # blktrace -w 1 -d /dev/sda
FAILED to start thread on CPU 6: 22/Invalid argument
FAILED to start thread on CPU 7: 22/Invalid argument
FAILED to start thread on CPU 8: 22/Invalid argument
FAILED to start thread on CPU 9: 22/Invalid argument
I found an interesting thing.
I installed the blktrace source and I found several patches in there, one of
them is exactly the opposite of what this patch proposes: use configured cpus
instead of online cpus:
blktrace-use-number-of-configured-cpus-instead-of-online-cpus.patch
Without applying the patches:
s35lp49:/usr/src/packages/SOURCES # ls -l b*patch
-rw-r--r-- 1 root root 3171 Dec 15 2008
blkparse-track-smallest-sequence-read-per-device.patch
-rw-r--r-- 1 root root 3748 Aug 20 2015
blktrace-blkreplay-convert-to-use-a-dynamic-cpu_set_t.patch
-rw-r--r-- 1 root root 1223 Aug 20 2015
blktrace-use-number-of-configured-cpus-instead-of-online-cpus.patch
-rw-r--r-- 1 root root 1155 Aug 20 2015
btreplay-fix-typo-in-scaling-up-the-dynamic-cpu-set-size.patch
-rw-r--r-- 1 root root 1593 Aug 20 2015
btreplay-machines-are-now-large-enough-that-holes-need-to-be-dealt-with.patch
-rw-r--r-- 1 root root 1292 Aug 20 2015
btreplay-use-sysconf-to-get-the-number-of-configured-cpus.patch
or if I apply the patch proposed in:
http://git.kernel.dk/?p=blktrace.git;a=commit;h=80c4041b2e7a7d5afb75df563bf51bb27773c095
after applying the patches mentioned above, blktrace works:
s35lp49:/usr/src/packages/SOURCES/blktrace-1.0.5 # ./blktrace -w 1 -d /dev/sda
=== sda ===
CPU 0: 0 events, 0 KiB data
CPU 1: 1 events, 1 KiB data
CPU 2: 0 events, 0 KiB data
CPU 3: 0 events, 0 KiB data
CPU 4: 0 events, 0 KiB data
CPU 5: 0 events, 0 KiB data
Total: 1 events (dropped 0), 1 KiB data
It seems to me that blktrace-use-number-of-configured-cpus-instead-of-
online-cpus.patch was the cause of this bug.
====> Common code specific !
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