Hi all,
I can reproduce one segmentation fault in
lvm2(lvm2-2.02.100-8.el6.x86_64) with below steps:
1. create PV,VG with 9 disk, 4GB each:
pvcreate /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdf /dev/sdg
/dev/sdh /dev/sdi /dev/sdj
vgcreate vgmlpap /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdf
/dev/sdg /dev/sdh /dev/sdi /dev/sdj
2.create a LV , say 2G initial, 6 strips.
lvcreate -L 2G -n lvpap007 -i 6 -I 128k vgmlpap
3.extend this LV several times with 1 strip:
lvextend -L +600M -i 1 /dev/mapper/vgmlpap-lvpap007 (repeat this
several times)
4.segmentation fault appear when the first physical volume can't meet
the required extends.
I tracked this a little more, and found that it's due to the strip 1
parameter and when the first PV leaves no enough extends, it need 2 area
to do the space allocation, but the area number was not extend , so when
it try to access the aa array in function _alloc_parallel_area of file
lib/metadata/lv_manip.c with a non exist index it segment fault! This lines:
aa[s].len = (ah->alloc_and_split_meta) ? len -
ah->log_len : len;
/* Skip empty allocations */
if (!aa[s].len)
continue;
aa[s].pv = pva->map->pv;
aa[s].pe = pva->start;
I am not an expert of LVM code , could you please give a quick fix of
this? It should be not hard:)
Please reply me with my email , I am not in the mail list.
Thanks,
Xiaowei
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