Description of problem:

multipathd dies.


Version-Release number of selected component (if applicable):

I hit this with both the RHEL4 update 4 and update 5 (RC1) version of
device-mapper-multipath.


How reproducible:

Every time, following the instructions below


Steps to Reproduce:

1. Server is connected via a switch to an EMC CX300, zoned so that one HBA in
the server can talk to SP A in the CX300, the other HBA in the server can talk
to SP B in the CX300.

2. Pull the fibre channel cable from one SP in the CX300.

3. Run "multipath -l" repeatedly until it hangs. Kill it via ctrl-c, then run
"multipath -l" again (it will hang again). Don't know if running it a second
time is important or not, but killing one invocation is important--no error if
you don't do this.

4. After a little while, the multipath -l command will un-hang itself; at this
point, multipathd dies.

I hit this under update 4 originally. I also hit the same problem in update 4
with Stratus ftScalable Storage, by shutting down and restarting both RAID
controllers.

Things are a bit different under update 5, in that if I did "multipath -ll" I
wasn't able to control-c the command, and in that case multipathd survived. But
with "multipath -l" I was able to reproduce the problem. I did my update 5
testing with Stratus ftScalable Storage, because I didn't have an update 5
system connected to a Clariion.
  

Actual results:

multipathd dies


Expected results:

multipathd does not die


Additional info:

The following patch fixes the problem. This is from
http://git.kernel.org/gitweb.cgi?p=linux%2Fstorage%2Fmultipath-tools%2F.git;a=log



[multipathd] ignore SIGPIPE



Christophe Varoqui [Thu, 16 Mar 2006 08:07:02 +0000 (09:07 +0100)]



Maxim Kozover reported daemon segfault when breaking the recieving side

of the unix socket. Credits.



diff --git a/multipathd/main.c b/multipathd/main.c



--- a/multipathd/main.c

+++ b/multipathd/main.c

@@ -1215,6 +1215,7 @@ signal_init(void)

        signal_set(SIGINT, sigend);

        signal_set(SIGTERM, sigend);

        signal_set(SIGKILL, sigend);

+       signal(SIGPIPE, SIG_IGN);

 }



 static void