Red Hat Bugzilla – Bug 80264
strace -f breaks WNOHANG
Last modified: 2007-11-30 17:06:52 EST
Description of problem:
Strace -f will break with programs that use the wait4 system call (aka waitpid
or wait3) with the WNOHANG flag when they have live children.
Version-Release number of selected component (if applicable):
strace-4.3-2 (comes with AS 2.1)
(problem exists w/ 7.x and 8.0)
Always. AT&T's ksh is a reliable reproducer.
Steps to Reproduce:
1.Install AT&T ksh and any version of strace from above.
2.Run attached test script.
strace should be able to follow processes.
AT&T's ksh93 is available from www.kornshell.com
Created attachment 88867 [details]
tarball of strace output and ksh test script.
Created attachment 88868 [details]
strace-4.4.cvs20021221rh-1 on 8.0
same failure as before
Created attachment 88869 [details]
tarball showing failure with strace-4.4.cvs20021221rh-1
I am confused. There is no sign of the bug in the attachments here.
The failure mode before was that strace interfered with the normal functioning
of ksh, indicated by the "Warning: error(s) creating ..." message produced from
the script. Those messages do not appear in your transcripts attached here.
Please state explicitly for the record what criteria you are applying when
you say that there is still a bug here.
Version 4.4.91-1 should work fine.
An errata has been issued which should help the problem described in this bug report.
This report is therefore being closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files, please follow the link below. You may reopen
this bug report if the solution does not work for you.