4416 2007-04-23 22:58:00 +0000 setlocales can fail silentely 2007-04-24 10:14:33 +0000 1 1 1 Unclassified glibc libc unspecified All All RESOLVED INVALID P2 normal --- 1 madcoder drepper.fsp glibc-bugs 16552 madcoder 2007-04-23 22:58:58 +0000 When Virtual Memory is low, the mmap of /usr/lib/locale/locale-archive can fail (in loadarchive.c, function _nl_load_locale_from_archive). Then, _nl_find_locale (findlocale.c) tries to recover from that, trying to guess pathes or sth like that on its own. But it still fails because it can't find LC_IDENTIFICATION files and setlocale returns something completely broken. You can emulate that by renaming /usr/lib/locale/locale-archive. A sample problematic program is: ================================================ #include <stdio.h> #include <locale.h> int main(void) { const char *s; s = setlocale(LC_ALL, "en_US.utf-8"); printf("%s\n", s); return 0; } ================================================ strace gives: ================================================ brk(0) = 0x601000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2ac0f56dd000 uname({sys="Linux", node="artemis", ...}) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2ac0f56de000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=57422, ...}) = 0 mmap(NULL, 57422, PROT_READ, MAP_PRIVATE, 3, 0) = 0x2ac0f56e0000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/lib/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\324\1"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1359200, ...}) = 0 mmap(NULL, 2416808, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x2ac0f57de000 mprotect(0x2ac0f5924000, 1044480, PROT_NONE) = 0 mmap(0x2ac0f5a23000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED| MAP_DENYWRITE, 3, 0x145000) = 0x2ac0f5a23000 mmap(0x2ac0f5a28000, 16552, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED| MAP_ANONYMOUS, -1, 0) = 0x2ac0f5a28000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2ac0f5a2d000 arch_prctl(ARCH_SET_FS, 0x2ac0f5a2d6f0) = 0 mprotect(0x2ac0f5a23000, 12288, PROT_READ) = 0 munmap(0x2ac0f56e0000, 57422) = 0 brk(0) = 0x601000 brk(0x622000) = 0x622000 open("/usr/lib/locale/locale-archive", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale/locale.alias", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/lib/locale/en_US.utf-8/LC_IDENTIFICATION", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/lib/locale/en_US.utf8/LC_IDENTIFICATION", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/lib/locale/en_US/LC_IDENTIFICATION", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/lib/locale/en.utf-8/LC_IDENTIFICATION", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/lib/locale/en.utf8/LC_IDENTIFICATION", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/lib/locale/en/LC_IDENTIFICATION", O_RDONLY) = -1 ENOENT (No such file or directory) --- SIGSEGV (Segmentation fault) @ 0 (0) --- +++ killed by SIGSEGV +++ ==================================================== I don't expect setlocale especially to success even with low memory, but at least it should fail (return NULL) to express the fact that it only loaded C locale. 16560 madcoder 2007-04-24 11:14:33 +0000 ahem, I was testing on a 2.3 libc rather than the 2.5 sorry, it seems to work fine now.