* mdadm crash with lots of devs
@ 2012-07-09 14:38 Jan Engelhardt
2012-07-09 21:50 ` NeilBrown
0 siblings, 1 reply; 3+ messages in thread
From: Jan Engelhardt @ 2012-07-09 14:38 UTC (permalink / raw)
To: linux-raid
Using mdadm-3.2.2 from openSUSE_12.1:
# modprobe brd rd_size=1 rd_nr=4096
# mdadm -C /dev/md9 -l 10 -n 384 /dev/ram{0..383}
mdadm: Defaulting to version 1.2 metadata
Segmentation fault (core dumped)
#1 Create (st=0xb4c600, mddev=0x7fff3bda64c0 "/dev/md9", chunk=512, level=10,
layout=12593328, size=4, raiddisks=384, sparedisks=0,
name=0x7fff3bda64c7 "9", homehost=0x7fff3bda6fe0 "seven", uuid=0x0,
subdevs=384, devlist=0xb49030, runstop=0, verbose=0, force=0,
assume_clean=0, bitmap_file=0x0, bitmap_chunk=65534, write_behind=0,
delay=5, autof=0) at Create.c:899
899 fprintf(stderr,
(gdb) l
894 info_new.uuid, chosen_name);
895 me = map_by_devnum(&map, st->container_dev);
896 }
897
898 if (st->ss->write_init_super(st)) {
899 fprintf(stderr,
900 Name ": Failed to write metadata to %s\n",
901 dv->devname);
902 st->ss->free_super(st);
903 goto abort;
(gdb) p dv
$1 = <optimized out>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: mdadm crash with lots of devs
2012-07-09 14:38 mdadm crash with lots of devs Jan Engelhardt
@ 2012-07-09 21:50 ` NeilBrown
2012-07-09 23:06 ` Jan Engelhardt
0 siblings, 1 reply; 3+ messages in thread
From: NeilBrown @ 2012-07-09 21:50 UTC (permalink / raw)
To: Jan Engelhardt; +Cc: linux-raid
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On Mon, 9 Jul 2012 16:38:47 +0200 (CEST) Jan Engelhardt <jengelh@inai.de>
wrote:
>
> Using mdadm-3.2.2 from openSUSE_12.1:
>
> # modprobe brd rd_size=1 rd_nr=4096
> # mdadm -C /dev/md9 -l 10 -n 384 /dev/ram{0..383}
> mdadm: Defaulting to version 1.2 metadata
> Segmentation fault (core dumped)
>
> #1 Create (st=0xb4c600, mddev=0x7fff3bda64c0 "/dev/md9", chunk=512, level=10,
> layout=12593328, size=4, raiddisks=384, sparedisks=0,
> name=0x7fff3bda64c7 "9", homehost=0x7fff3bda6fe0 "seven", uuid=0x0,
> subdevs=384, devlist=0xb49030, runstop=0, verbose=0, force=0,
> assume_clean=0, bitmap_file=0x0, bitmap_chunk=65534, write_behind=0,
> delay=5, autof=0) at Create.c:899
> 899 fprintf(stderr,
> (gdb) l
> 894 info_new.uuid, chosen_name);
> 895 me = map_by_devnum(&map, st->container_dev);
> 896 }
> 897
> 898 if (st->ss->write_init_super(st)) {
> 899 fprintf(stderr,
> 900 Name ": Failed to write metadata to %s\n",
> 901 dv->devname);
> 902 st->ss->free_super(st);
> 903 goto abort;
> (gdb) p dv
> $1 = <optimized out>
> --
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This bug is fixed by
http://neil.brown.name/git?p=mdadm;a=commitdiff;h=401142133
It isn't specific to large numbers of devices.
If you would like an update for 12.1, I suggest opening a bug on
bugzilla.novell.com.
If you want to work with larger numbers of devices, I suggest getting the
mdadm from Factory - it has a number of fixes in this area.
Thanks,
NeilBrown
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: mdadm crash with lots of devs
2012-07-09 21:50 ` NeilBrown
@ 2012-07-09 23:06 ` Jan Engelhardt
0 siblings, 0 replies; 3+ messages in thread
From: Jan Engelhardt @ 2012-07-09 23:06 UTC (permalink / raw)
To: NeilBrown; +Cc: linux-raid
On Monday 2012-07-09 23:50, NeilBrown wrote:
>> Using mdadm-3.2.2 from openSUSE_12.1:
>>
>> # modprobe brd rd_size=1 rd_nr=4096
>> # mdadm -C /dev/md9 -l 10 -n 384 /dev/ram{0..383}
>> mdadm: Defaulting to version 1.2 metadata
>> Segmentation fault (core dumped)
>
>It isn't specific to large numbers of devices.
Indeed not, it seems to be related to the rather small size
of the device :)
Using an rd_size=64 (with that old mdadm version) will emit
a warning rather than crash, and rd_size=1024 seems to be
the first working size.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2012-07-09 14:38 mdadm crash with lots of devs Jan Engelhardt
2012-07-09 21:50 ` NeilBrown
2012-07-09 23:06 ` Jan Engelhardt
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