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
Status in Auto Package Testing:
New
Status in systemd package in Ubuntu:
New
Bug description:
Clock stepped backward on a testbed:
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac
/autopkgtest-
groovy/groovy/amd64/b/boost1.71/20200501_151103_1e387@/log.gz
...
context FAIL stderr: make[2]: Warning: File
'/tmp/tmp.qPfGPM84a1/src/demo2.cpp' has modification time 0.52 s in the future
autopkgtest [13:55:37]: test context: - - - - - - - - - - stderr - - - - - -
- - - -
make[2]: Warning: File '/tmp/tmp.qPfGPM84a1/src/demo2.cpp' has modification
time 0.52 s in the future
make[2]: warning: Clock skew detected. Your build may be incomplete.
..
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