[Bug 1053306] Re: iscsiadm hangs in recvmsg()

[dann frazier]

By increasing the iscsid debug level to 8 (to increase logging), we are
able to reproduce failures by running discover/loginall/logoutall in a
loop against a SAN exposing 3 targets within seconds. Symptoms vary -
sometimes iscsid crashes, sometimes we see semop errors in syslog,
sometimes just hangs - but I suppose that's expected w/ data corruption
issues. After applying https://github.com/mikechristie/open-
iscsi/commit/b95a7ca80b255f0c5b34b2669367b629c8489552, we've been able
to survive 12 hours and counting.

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https://bugs.launchpad.net/bugs/1053306

Title:
  iscsiadm hangs in recvmsg()

Status in “open-iscsi” package in Ubuntu:
  New
Status in “open-iscsi” package in Fedora:
  Unknown

Bug description:
  We occasionally see iscsiadm hang indefinitely on a system. It is
  difficult to reproduce, there maybe months between occurrences. This
  happened again today, and we collected the following information.

  We captured an strace of a failing iscsiadm discover process, I'll
  attach it here. All iscsiadm processes that are hung are also in
  recvmsg() when we attach strace.

  It was observed that there was one iscsid process - where normally
  there is 2. The pids are normally consecutive, so I presume one forks
  the other before daemonizing.

  syslog contains the following messages from iscsid:

  Sep 20 15:55:57 cn5 iscsid: semop up failed 4
  Sep 20 15:56:05 cn5 iscsid: semop down failed
  Sep 20 15:56:23 cn5 iscsid: semop up failed 4
  Sep 20 16:02:23 cn5 iscsid: semop up failed 4
  Sep 20 16:02:26 cn5 iscsid: semop up failed 4
  Sep 20 16:02:26 cn5 iscsid: semop up failed 4
  Sep 20 16:02:26 cn5 iscsid: semop up failed 4
  Sep 20 16:02:32 cn5 iscsid: semop up failed 4
  Sep 20 18:01:49 cn5 iscsid: semop up failed 4
  Sep 20 18:03:56 cn5 iscsid: semop up failed 4
  Sep 20 18:05:03 cn5 iscsid: semop up failed 4

  This sounds similar to the issue described in
  https://bugzilla.redhat.com/show_bug.cgi?id=676804, but note the
  different errno.

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