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Bug 134559 - pvcreate hangs with todays build
pvcreate hangs with todays build
Product: Red Hat Cluster Suite
Classification: Red Hat
Component: gfs (Show other bugs)
i686 Linux
medium Severity medium
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Assigned To: Christine Caulfield
GFS Bugs
Depends On:
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Reported: 2004-10-04 12:42 EDT by Corey Marthaler
Modified: 2010-01-11 21:59 EST (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2004-10-27 14:49:18 EDT
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RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Corey Marthaler 2004-10-04 12:42:04 EDT
Description of problem:
I am seeing this repeatedly on my nodes when attempting to
create PVs. The 'pvcreate /dev/sda' cmd just appears to hang. 
This is very similar to bz134353. Here is where the strace 
shows it's at:

open("/lib/liblvm2clusterlock.so", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0L\7\0\000"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0555, st_size=9284, ...}) = 0
old_mmap(NULL, 9716, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40218000
old_mmap(0x4021a000, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED, 3, 0x1000) = 0x4021a000
close(3)                                = 0
socket(PF_UNIX, SOCK_STREAM, 0)         = 3
connect(3, {sa_family=AF_UNIX, path=@clvmd}, 110) = 0
rt_sigprocmask(SIG_SETMASK, ~[RTMIN], [], 8) = 0
write(3, "3\1\0\277\0\0\0\0\0\0\0\0\f\0\0\0\0\4\0P_orphans\0+", 30) = 30

How reproducible:
Comment 1 Christine Caulfield 2004-10-05 03:39:24 EDT
This is almost certainly a the same thing as 134353 and the same
comment applies. 

Can you provide some clvmd debugging please as I can't make it fail here.

Readins as much as I can into the strace it looks like a simple VG
lock which is waiting (in clvmd). There are three possible scenarios
for that:

1. Locking is suspended because either the cluster isn't quorate or  
   the lockspace is in recovery.
   cat /proc/cluster/services is the diagnostic here, obviously
2. Some other process/machine already has the P_orphans lock.
   echo "clvmd" > /proc/cluster/dlm_locks
   cat /proc/cluster/dlm_locks
   will help to check for this
3. There's a bug somewhere in the chain, most likely in clvmd but
   possibly in the dlm userland interface.
Comment 2 Corey Marthaler 2004-10-05 11:11:19 EDT
At the time of the hang all nodes show that all services are in the 
run state: 
[root@morph-01 clvmd]# cat /proc/cluster/services 
Service          Name                              GID LID State     
Fence Domain:    "default"                           1   2 run       
[1 3 4 5 2] 
DLM Lock Space:  "clvmd"                             2   3 run       
[1 2 3 5 4] 
[root@morph-01 clvmd]# ps -ef | grep pvcreate 
root      4490  4488  0 10:02 ?        00:00:00 pvcreate /dev/sda 
root      4501  2153  0 10:12 pts/0    00:00:00 grep pvcreate 
[root@morph-01 clvmd]# echo "clvmd" > /proc/cluster/dlm_locks 
[root@morph-01 clvmd]# cat /proc/cluster/dlm_locks 
DLM lockspace 'clvmd' 
Resource f4d60934 (parent 00000000). Name (len=9) "P_orphans" 
Master Copy 
Granted Queue 
0001002c PW 
Conversion Queue 
Waiting Queue 
[root@morph-01 clvmd]# 
Comment 3 Christine Caulfield 2004-10-05 11:34:56 EDT
Ok, so we know it's getting the lock OK. that means it's probably
clvmd not replying for some reason. I copied your clvmd onto my
cluster and it still works fine so I'm going to need some help. Can
you build a debug clvmd and get some output from it? or leave me your
cluster to play with one morning ?
Comment 4 Corey Marthaler 2004-10-05 12:17:08 EDT
Here's a crazy twist, I can only see this bug if clvmd is run as a 
daemon. If I run it in the foreground (no daemonization) I don't see 
the bug and everything runs just fine.  
Comment 5 Christine Caulfield 2004-10-06 06:13:22 EDT
That was the clue I needed. See 134353 for more details.
Comment 6 Corey Marthaler 2004-10-27 14:49:18 EDT
fix verified.
Comment 7 Kiersten (Kerri) Anderson 2004-11-16 14:03:43 EST
Updating version to the right level in the defects.  Sorry for the storm.

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