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
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To: hashar
Cc: Daimona, thcipriani, hashar, awight, kostajh, Lucas_Werkmeister_WMDE,
Alter-paule, Beast1978, Un1tY, Akuckartz, Hook696, Kent7301, joker88john,
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Maathavan, _jensen, rosalieper, Liudvikas, Scott_WUaS, Wikidata-bugs, aude,
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