hashar added a comment.
No with child tracing (`-f`) and time spent in system call (`-T`). PID 23094 invokes `epoll_pwait` which resumes after 3 seconds for whatever reason. name=strace -s 128 -tt -yy -T -f [pid 23092] 10:21:51.923319 write(2<pipe:[76629877]>, "time=\"2020-10-28T10:21:51Z\" level=debug msg=\"[hijack] End of stdout\"\n", 69) = 69 <0.000028> [pid 23092] 10:21:51.923443 futex(0xc00032e848, FUTEX_WAKE_PRIVATE, 1 <unfinished ...> [pid 23094] 10:21:51.923498 <... futex resumed> ) = 0 <0.146771> [pid 23092] 10:21:51.923531 <... futex resumed> ) = 1 <0.000064> [pid 23094] 10:21:51.923631 epoll_pwait(4<anon_inode:[eventpoll]>, [], 128, 0, NULL, 0) = 0 <0.000017> [pid 23092] 10:21:51.923711 epoll_pwait(4<anon_inode:[eventpoll]>, <unfinished ...> [pid 23094] 10:21:51.923772 epoll_pwait(4<anon_inode:[eventpoll]>, <unfinished ...> [pid 23092] 10:21:51.923823 <... epoll_pwait resumed> [], 128, 0, NULL, 824637311584) = 0 <0.000071> [pid 23092] 10:21:51.923866 futex(0xc00032e4c8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...> [pid 23086] 10:21:51.923916 <... futex resumed> ) = 0 <0.147012> [pid 23086] 10:21:51.923964 nanosleep({tv_sec=0, tv_nsec=20000}, NULL) = 0 <0.000114> [pid 23086] 10:21:51.924144 futex(0x55ab98437a90, FUTEX_WAIT_PRIVATE, 0, {tv_sec=60, tv_nsec=0} <unfinished ...> [pid 23094] 10:21:55.008992 <... epoll_pwait resumed> [{EPOLLIN|EPOLLOUT, {u32=2505785096, u64=140237482966792}}], 128, -1, NULL, 3) = 1 <3.085160> [pid 23094] 10:21:55.009155 futex(0x55ab98437a90, FUTEX_WAKE_PRIVATE, 1) = 1 <0.000065> [pid 23086] 10:21:55.009303 <... futex resumed> ) = 0 <3.085131> TASK DETAIL https://phabricator.wikimedia.org/T265615 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: hashar Cc: Daimona, thcipriani, hashar, awight, kostajh, Lucas_Werkmeister_WMDE, Alter-paule, Beast1978, Un1tY, Akuckartz, Hook696, Kent7301, joker88john, CucyNoiD, Nandana, NebulousIris, Gaboe420, Giuliamocci, Cpaulf30, Lahi, Gq86, Af420, Bsandipan, GoranSMilovanovic, QZanden, LawExplorer, Lewizho99, Maathavan, _jensen, rosalieper, Liudvikas, Scott_WUaS, Wikidata-bugs, aude, Jdforrester-WMF, Mbch331, Jay8g
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