Red Hat Bugzilla – Bug 127060
Program waiting for a semaphore are interrupted when attached from gdb.
Last modified: 2015-01-07 19:08:10 EST
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686) Gecko/20040428 Galeon/1.3.7 Description of problem: The bug is related with gdb and system V semaphore. A program waiting for a semaphore are interrupted if you attach gdb to to the process and continue the execution. I write an example to reproduce the problem. Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1. compile the example program with 'gcc -g3 -Wall -lpthread -DREENTRANT -o infinite main.c' 2. start the programm 3. start gdb 'gdb <path_to_infinite>/infinite <pid_of_infinite>' 4. in gdb type continue. Actual Results: The example program 'infinite' will exit with the error 'sem_wait: Interrupted system call'. Expected Results: Normally should continue to run. Additional info: The same result are reached using fork(). So the problem is not releated with posix thread. I founded a bug description at http://sources.redhat.com/ml/bug-gdb/1999-12/msg00038.html but don_t exist a fix related to this bug
Created attachment 101556 [details] see bug description
Hi, i fount the problem. If i use evaluate EINTR in a while loop the program will work. This is different from all other Unix Systems (i tested on HP-UX, Solaris) but is ok, it works.