https://bugs.kde.org/show_bug.cgi?id=432508
Bug ID: 432508
Summary: Valgrind does not honor setrlimit RLIMIT_NOFILE
changes
Product: valgrind
Version: 3.15 SVN
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: bal...@balintreczey.hu
Target Milestone: ---
SUMMARY
Valgrind uses open file limits in effect when valgrind starts, ignoring the
changes made my the debugged program.
STEPS TO REPRODUCE
$ cat many-files.c
#include <assert.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/resource.h>
int main (int argc, char ** argv) {
int i;
struct rlimit rlim;
getrlimit(RLIMIT_NOFILE, &rlim);
assert(rlim.rlim_cur <= 1024);
rlim.rlim_cur = 2048;
setrlimit(RLIMIT_NOFILE, &rlim);
for (i = 4; i < 1028; i++) {
dup2(1, i);
}
for (i = 4; i < 1028; i++) {
close(i);
}
return 1;
}
$ gcc many-files.c
$ valgrind ./a.out
OBSERVED RESULT
==3814075== Memcheck, a memory error detector
==3814075== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==3814075== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright info
==3814075== Command: ./a.out
==3814075==
==3814075== Warning: invalid file descriptor 1024 in syscall dup2()
==3814075== Warning: invalid file descriptor 1025 in syscall dup2()
==3814075== Warning: invalid file descriptor 1026 in syscall dup2()
==3814075== Warning: invalid file descriptor 1027 in syscall dup2()
==3814075== Use --log-fd=<number> to select an alternative log fd.
==3814075== Warning: invalid file descriptor 1024 in syscall close()
==3814075== Warning: invalid file descriptor 1025 in syscall close()
==3814075== Warning: invalid file descriptor 1026 in syscall close()
==3814075== Warning: invalid file descriptor 1027 in syscall close()
==3814075== Use --log-fd=<number> to select an alternative log fd.
==3814075==
==3814075== HEAP SUMMARY:
==3814075== in use at exit: 0 bytes in 0 blocks
==3814075== total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==3814075==
==3814075== All heap blocks were freed -- no leaks are possible
==3814075==
==3814075== For lists of detected and suppressed errors, rerun with: -s
==3814075== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
EXPECTED RESULT
Valgrind notices RLIMIT_NOFILE changes and uses the new limit in fd validity
check.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Ubuntu 20.04
Valgrind: valgrind-3.15.0
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