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Problem Report 2417 Details
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Problem Report Number 2417 Submitter's Classification Test Suite problem State Resolved Resolution Test Suite Deficiency (TSD) Problem Resolution ID TSD.X.1252 Raised 2004-08-26 22:50 Updated 2004-09-01 19:50 Published 2004-09-01 19:50 Product Standard Internationalised System Calls and Libraries Extended (UNIX 95) Certification Program The Open Brand certification program Test Suite VSU version 5.2.4 Test Identification CAPI.os/procprim/sigaction/T.sigaction 13 Problem Summary Race conditon can cause CAPI.os/procprim/sigaction/T.sigaction{13} to fail. Problem Text For test CAPI.os/procprim/sigaction/T.sigaction{13}, a race condition
can occur that will cause the test to intermittently fail.
We show the timing issues involved by modifying the sigaction{13}
code as follow
s:
-------------------
......
sleep(5);
tet_infoline("TEST: getpgid() returns ESRCH for child");
errno=0;
if (getpgid(pid) != -1) {
tet_infoline("ERROR: Child process still exists");
tet_infoline("VWM: Before setting TET_FAIL issue getpgid(pid) again");
if (getpgid(pid) == -1) {
tet_infoline("VWM: ok this time it did return -1");
}
else {
tet_infoline("VWM: **ERROR** child process STILL exists");
}
tet_result(TET_FAIL);
} else if (errno != ESRCH) {
uwerrno("getpgid");
return;
}
tet_result(TET_PASS);
}
-------------------
We ran this modified sigaction{13} five consecutive times and
obtained the attached output showing a run with three PASSes and two
FAILs that immediately reissued getpgid() and did not find the child PID.
Here are the Journal results:
10|0 /tset/CAPI.os/procprim/sigaction/T.sigaction 10:48:03|TC Start,
scenario ref 1-0, ICs: {13}
15|0 3.6-lite 1|TCM Start
400|0 13 1 10:48:03|IC Start
200|0 13 10:48:03|TP Start
520|0 13 00016842814 1 1|PREP: Set up action for SIGCHLD
520|0 13 00016842814 1 2|PREP: fork() a child that does nothing but exit
520|0 13 00016842814 2 1|TEST: getpgid() returns ESRCH for child
220|0 13 0 10:48:03|PASS
410|0 13 1 10:48:03|IC End
80|0 0 10:48:04|TC End, scenario ref 1-0
10|1 /tset/CAPI.os/procprim/sigaction/T.sigaction 10:48:04|TC Start,
scenario ref 2-0, ICs: {13}
15|1 3.6-lite 1|TCM Start
400|1 13 1 10:48:04|IC Start
200|1 13 10:48:04|TP Start
520|1 13 00050397246 1 1|PREP: Set up action for SIGCHLD
520|1 13 00050397246 1 2|PREP: fork() a child that does nothing but exit
520|1 13 00050397246 2 1|TEST: getpgid() returns ESRCH for child
520|1 13 00050397246 2 2|ERROR: Child process still exists
520|1 13 00050397246 2 3|VWM: Before setting TET_FAIL issue getpgid(pid)
again
520|1 13 00050397246 2 4|VWM: ok this time it did return -1
220|1 13 1 10:48:04|FAIL
410|1 13 1 10:48:04|IC End
80|1 0 10:48:05|TC End, scenario ref 2-0
10|2 /tset/CAPI.os/procprim/sigaction/T.sigaction 10:48:05|TC Start,
scenario ref 3-0, ICs: {13}
15|2 3.6-lite 1|TCM Start
400|2 13 1 10:48:05|IC Start
200|2 13 10:48:05|TP Start
520|2 13 00067174462 1 1|PREP: Set up action for SIGCHLD
520|2 13 00067174462 1 2|PREP: fork() a child that does nothing but exit
520|2 13 00067174462 2 1|TEST: getpgid() returns ESRCH for child
520|2 13 00067174462 2 2|ERROR: Child process still exists
520|2 13 00067174462 2 3|VWM: Before setting TET_FAIL issue getpgid(pid)
again
520|2 13 00067174462 2 4|VWM: ok this time it did return -1
220|2 13 1 10:48:05|FAIL
410|2 13 1 10:48:05|IC End
80|2 0 10:48:06|TC End, scenario ref 3-0
10|3 /tset/CAPI.os/procprim/sigaction/T.sigaction 10:48:06|TC Start,
scenario ref 4-0, ICs: {13}
15|3 3.6-lite 1|TCM Start
400|3 13 1 10:48:06|IC Start
200|3 13 10:48:06|TP Start
520|3 13 00083951678 1 1|PREP: Set up action for SIGCHLD
520|3 13 00083951678 1 2|PREP: fork() a child that does nothing but exit
520|3 13 00083951678 2 1|TEST: getpgid() returns ESRCH for child
220|3 13 0 10:48:06|PASS
410|3 13 1 10:48:06|IC End
80|3 0 10:48:07|TC End, scenario ref 4-0
10|4 /tset/CAPI.os/procprim/sigaction/T.sigaction 10:48:07|TC Start,
scenario ref 5-0, ICs: {13}
15|4 3.6-lite 1|TCM Start
400|4 13 1 10:48:07|IC Start
200|4 13 10:48:07|TP Start
520|4 13 00050397313 1 1|PREP: Set up action for SIGCHLD
520|4 13 00050397313 1 2|PREP: fork() a child that does nothing but exit
520|4 13 00050397313 2 1|TEST: getpgid() returns ESRCH for child
220|4 13 0 10:48:07|PASS
410|4 13 1 10:48:07|IC End
80|4 0 10:48:08|TC End, scenario ref 5-0
900|10:48:08|TCC EndTest Output 10|1 /tset/CAPI.os/procprim/sigaction/T.sigaction 10:48:04|TC Start,
scenario ref 2-0, ICs: {13}
15|1 3.6-lite 1|TCM Start
400|1 13 1 10:48:04|IC Start
200|1 13 10:48:04|TP Start
520|1 13 00050397246 1 1|PREP: Set up action for SIGCHLD
520|1 13 00050397246 1 2|PREP: fork() a child that does nothing but exit
520|1 13 00050397246 2 1|TEST: getpgid() returns ESRCH for child
520|1 13 00050397246 2 2|ERROR: Child process still exists
220|1 13 1 10:48:04|FAIL
410|1 13 1 10:48:04|IC End
80|1 0 10:48:05|TC End, scenario ref 2-0Review Information
Review Type TSMA Review Start Date 2004-08-26 22:50 Last Updated 2004-08-31 20:56 Completed 2004-08-31 20:56 Status Complete Review Recommendation Test Suite Deficiency (TSD) Review Response The race condition occurs if the sleep(5) is interrupted by a SIGCHLD
signal. The test should be modified to allow for this by calling
sleep() a second time if the first call is interrupted.
Review Type SA Review Start Date 2004-08-31 19:56 Last Updated 2004-09-01 00:33 Completed 2004-09-01 00:33 Status Complete Review Resolution Test Suite Deficiency (TSD) Review Conclusion This PR represents an agreed test suite deficiency
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