| Summary: | strace doesn't log when you call clock_gettime | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | edb_unix | ||||||||
| Component: | strace | Assignee: | Roland McGrath <roland> | ||||||||
| Status: | CLOSED NOTABUG | QA Contact: | qe-baseos-tools-bugs | ||||||||
| Severity: | medium | Docs Contact: | |||||||||
| Priority: | low | ||||||||||
| Version: | 6.0 | ||||||||||
| Target Milestone: | rc | ||||||||||
| Target Release: | --- | ||||||||||
| Hardware: | All | ||||||||||
| OS: | Linux | ||||||||||
| Whiteboard: | |||||||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||||||
| Doc Text: | Story Points: | --- | |||||||||
| Clone Of: | Environment: | ||||||||||
| Last Closed: | 2010-07-13 19:28:10 UTC | Type: | --- | ||||||||
| Regression: | --- | Mount Type: | --- | ||||||||
| Documentation: | --- | CRM: | |||||||||
| Verified Versions: | Category: | --- | |||||||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||||||
| Attachments: |
|
||||||||||
Created attachment 431432 [details]
strace of testclock on a 5.4
Created attachment 431433 [details]
strace of testclock on 6.0 Beta
There is no bug here. The clock_gettime call on x86_64 can now sometimes work via the kernel-supplied vDSO without making a syscall. strace can't trace the call into the vDSO, since it's just user-mode code (albeit kernel-supplied). |
Created attachment 431431 [details] testprogram Description of problem: Strace doesn't show when you call clock_gettime. If we compare this with our 5.4 machine where it shows. Version-Release number of selected component (if applicable): strace-4.5.19-1.5.el6.x86_64 How reproducible: Always Steps to Reproduce: 1. Program: $ cat testclock.c #include <time.h> #include <stdio.h> int main(void) { int intRet; struct timespec res; intRet = clock_gettime(CLOCK_REALTIME, &res); } 2. gcc -o testclock -lrt testclock.c 3. strace ./testclock Actual results: A strace without any information about calling clock_gettime Expected results: Strace should get a result similair to the below (taken from a Red Hat Enterprise 5.4 environment): clock_gettime(CLOCK_REALTIME, {1279021215, 132738000}) = 0 Additional info: See attachment for the whole strace results.