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Subject: Re: [hwloc-users] Segmentation fault in collect_proc_cpuset, topology.c line 1074
From: cessenat_at_[hidden]
Date: 2013-01-16 12:49:21


Unfortunately it fails as well.
Failure happens when the proc involved is not proc number 0 of the node.

Olivier Cessenat.

----- Mail original -----
De: "Brice Goglin" <brice.goglin_at_[hidden]>
À: "Hardware locality user list" <hwloc-users_at_[hidden]>, cessenat_at_[hidden]
Envoyé: Mardi 15 Janvier 2013 19:26:30
Objet: Re: [hwloc-users] Segmentation fault in collect_proc_cpuset, topology.c line 1074

Indeed, there's a big cgroup crash in 1.6. Can you verify that 1.6.1rc2 works fine?

cessenat_at_[hidden] a écrit :


When updating from 1.5.1 to 1.6 I get a segfault when inside a
cgroup/cpuset in collect_proc_cpuset, file topology.c line 1074.

It appears that an HWLOC_OBJ_CORE has a son who is it's HWLOC_OBJ_GROUP's father !

$ cat /proc/self/cgroup
2: cpuset: /slurm/test
1: freezer: /
$ lssubsys -m cpuset
cpuset /cgroup/cpuset
$ cat /cgroup/cpuset/slurm/test/cpuset.cpus
$ hwloc-1.6/bis/lstopo
Segmentation fault (core dumped)
$ gdb...
Program terminated with signal 11, Segmentation fault.
#0 0x00007ffd758d225e in collect_proc_cpuset (obj=<value opt out>, sys=0x1f4dba0) at topology.c: 1074

The machine is made of bullx super-node S6010 (CEA Tera 100).

Thanks for your help,

Olivier Cessenat.

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