tags 598870 + patch quit How about this patch? The upstream mailing list bounced it.
From: Jonathan Nieder <jrnie...@gmail.com> To: valgrind-us...@lists.sourceforge.net Cc: Bcc: Subject: [PATCH] Add suppression for libnss_compat leak Reply-To: User-Agent: Mutt/1.5.20 (2009-06-14)
Programs using getpwuid() (or getpwuid_r(), getgrouplist(), etc) trigger a tiny one-tiny memory allocation in the glibc libnss implementation that is not freed by __libc_freeres. Filter it out. Works-around: http://sourceware.org/bugzilla/show_bug.cgi?id=2314 Signed-off-by: Jonathan Nieder <jrnie...@gmail.com> --- Hi, I ran into this about a year ago, forgot about it, and experienced it again today. If you'd like to try: $ cat test.c #include <unistd.h> #include <sys/types.h> #include <pwd.h> #include <stdio.h> int main(void) { struct passwd *pw = getpwuid(getuid()); printf("Hello, %s!\n", pw->pw_gecos); return 0; } $ gcc -g -o test test.c $ valgrind --leak-check=yes --gen-suppressions=all ./test [...] HEAP SUMMARY: in use at exit: 160 bytes in 11 blocks total heap usage: 66 allocs, 55 frees, 6,430 bytes allocated 160 (40 direct, 120 indirect) bytes in 1 blocks are definitely lost in loss record 11 of 11 at 0x4023F50: malloc (vg_replace_malloc.c:236) by 0x4110313: nss_parse_service_list (nsswitch.c:622) [...] { <insert_a_suppression_name_here> Memcheck:Leak fun:malloc fun:nss_parse_service_list fun:__nss_database_lookup obj:* obj:* fun:getpwuid_r@@GLIBC_2.1.2 fun:getpwuid fun:main } [...] $ /lib/libc.so.6 | head -1 GNU C Library (Debian EGLIBC 2.11.2-6) stable release version 2.11.2, by Roland McGrath et al. According to http://bugs.debian.org/273051 this bug has been around since at least glibc 2.3 days and the problem only shows up if you have passwd: compat in your /etc/nsswitch.conf How about this patch? glibc-2.X.supp.in | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/glibc-2.X.supp.in b/glibc-2.X.supp.in index 935bd74..8727c79 100644 --- a/glibc-2.X.supp.in +++ b/glibc-2.X.supp.in @@ -127,6 +127,13 @@ obj:*...@glibc_version@.*.so } +{ + glibc-bug-2314 + Memcheck:Leak + fun:malloc + fun:nss_parse_service_list + fun:__nss_database_lookup +} { glibc-2.5.x-on-SuSE-10.2-(PPC)-2b Memcheck:Addr4 fun:index -- 1.7.2.3
