Comment 0 for bug 2037910

atop fails autopkgtest on armhf[1]
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453s autopkgtest [10:04:02]: test 01-numcpus: [-----------------------
459s autopkgtest 01-numcpus failedatop thinks 0 CPUs, truth is 8 CPUs
462s /tmp/autopkgtest.qzseyS/build.3A3/src/debian/tests/01-numcpus: line 15: 886 Floating point exception(core dumped) atop -P cpu 5 1 1>&2
462s # The following is the parsable format, which can be fed to other
462s # programs. Each different item in every column has an unique ID
462s # starting usually from zero.
462s # CPU,Core,Socket,Node
462s 0,0,0,0
462s 1,1,0,0
462s 2,2,0,0
462s 3,3,0,0
462s 4,4,0,0
462s 5,5,0,0
462s 6,6,0,0
462s 7,7,0,0
463s autopkgtest [10:04:12]: test 01-numcpus: -----------------------]
467s autopkgtest [10:04:16]: test 01-numcpus: - - - - - - - - - - results - - - - - - - - - -
467s 01-numcpus FAIL non-zero exit status 1
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Armhf tests are performed in lxc containers.

atop tries to read data from `/var/run/pacct_shadow.d/0000000000.paf` provided by ./atopacctd

which fails to start with ` cannot switch on process accounting: Operation not permitted` but leaves the shadow file behind.

Atop tries to read it, finds empty file, retries (handling `daemon is still starting` condition) but does not handle retry timeout correctly and ends up with empty accounting size record.

[1] https://autopkgtest.ubuntu.com/results/autopkgtest-mantic/mantic/armhf/a/atop/20230921_100425_99856@/log.gz