https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243195
Bug ID: 243195
Summary: [libc] setlocale(LC_COLLATE, "...") causes
segmentation fault after certain number of calls
Product: Base System
Version: 12.1-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: bin
Assignee: bugs at FreeBSD.org
Reporter: myoga.murase at gmail.com
I'm running FreeBSD 12.1-RELEASE in VirtualBox on Windows 10.
$ uname -a
FreeBSD vm-freebsd 12.1-RELEASE FreeBSD 12.1-RELEASE r354233 GENERIC i386
The following reduced program results in a segmentation fault.
$ cat test1.c
#include <locale.h>
#include <stdio.h>
int main(int argc, char** argv) {
int i;
if (argc != 2) return 2;
printf("start\n");
fflush(stdout);
for (i = 0; i < 100000; i++) {
setlocale(LC_COLLATE, argv[1]);
setlocale(LC_COLLATE, "C");
}
printf("done\n");
fflush(stdout);
return 0;
}
$ gcc -o test1 test1.c
$ ./test1 en_US.UTF-8
start
Segmentation fault
$ ./test1 ja_JP.UTF-8
start
Segmentation fault
$ ./test1 ja_JP.eucJP
start
Segmentation fault
The number of successful invocation of `setlocale' until the
segmentation fault is always the same for the same locale, but it is
different for different locales. The segmentation fault is only
caused when the category LC_COLLATE is changed (through LC_COLLTE or
LC_ALL). There are no problems with the other categories.
I suspect the implementation of `__collate_load_tables_l' in
`lib/libc/locale/collate.c'. I'm not sure but maybe there is a memory
leak caused by missing `munmap'?
https://github.com/freebsd/freebsd/blob/b6fca3ee8065a5cfd3a36abfd7a2663eb5bfee7d/lib/libc/locale/collate.c#L184
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