My suspect is systemd-timesyncd:
See src/timesync/timesyncd-manager.c:
/*
* Maximum delta in seconds which the system clock is gradually adjusted
* (slewed) to approach the network time. Deltas larger that this are set by
* letting the system time jump. The kernel's limit for adjtime is 0.5s.
*/
#define NTP_MAX_ADJUST 0.4
I suspect the boost compilation's load made the internal clock diverge
enough for systemd to jump the time.
The default PollIntervalMaxSec is 2048 seconds in systemd.
I can reduce it in systemd, but there is a jump as high as 0.85 in
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-focal/focal/amd64/b/boost1.71/20200317_211804_626ff@/log.gz
which could not have been prevented by just halving the default.
How about changing the autopkgtest setup to either change a default or
disable systemd-timesyncd or install chrony instead?
** Also affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1880839
Title:
Clock skew on testbeds
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