Package: libnuma1 Version: 2.0.3~rc1-1 Severity: important Hello,
After upgrading a quad-socket quad-core machine from a custom 2.6.27 to Debian's 2.6.29, we were amazed to see that numactl now reports that --physcpubind=X is an out-of-range CPU when 12<=X<16 (while obviously we still have 16 cores in this machine). Same problem on other machines with 2.6.29: the last 4 cores are out-of-range. It appears that this is caused by set_thread_constraints() passing a wrong pointer to read_mask() when trying to gather maxproccpu and maxprocnode from /proc/self/status. It points to the second character of the mask instead of the first one, thus loosing one "f", which means 4 cores are lost. The kernel code generating the "Cpus_allowed:" and "Mems_allowed:" masks in /proc/self/status has changed recently, so maybe the formatting changed a bit (whitespaces?). The patch below fixes this problem by just passing a pointer to the first character after ":" instead of trying to guess howmany whitespaces follow, since read_mask/strtoul are able to skip whitespaces anyway. By the way, I think it would be better to parse /sys/devices/system/node/node*/cpumap instead of some lines of /proc/self/status... Signed-off-by: Brice Goglin <[email protected]> diff -ur numactl-2.0.3~rc1/libnuma.c numactl-2.0.3~rc1.save/libnuma.c --- numactl-2.0.3~rc1/libnuma.c 2008-12-09 20:38:07.000000000 +0100 +++ numactl-2.0.3~rc1.save/libnuma.c 2009-04-21 15:44:19.000000000 +0200 @@ -479,11 +479,11 @@ while (getline(&buffer, &buflen, f) > 0) { if (strncmp(buffer,"Cpus_allowed:",13) == 0) - maxproccpu = read_mask(buffer + 15, numa_all_cpus_ptr); + maxproccpu = read_mask(buffer + 13, numa_all_cpus_ptr); if (strncmp(buffer,"Mems_allowed:",13) == 0) { maxprocnode = - read_mask(buffer + 15, numa_all_nodes_ptr); + read_mask(buffer + 13, numa_all_nodes_ptr); } } fclose(f); -- System Information: Debian Release: squeeze/sid APT prefers testing APT policy: (990, 'testing'), (500, 'unstable'), (500, 'stable'), (1, 'experimental') Architecture: amd64 (x86_64) Kernel: Linux 2.6.29-1-amd64 (SMP w/16 CPU cores) Locale: LANG=C, lc_ctype=fr...@euro (charmap=ISO-8859-15) Shell: /bin/sh linked to /bin/bash Versions of packages libnuma1 depends on: ii libc6 2.9-4 GNU C Library: Shared libraries libnuma1 recommends no packages. libnuma1 suggests no packages. -- no debconf information -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
