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Bug 210453 - gnbd handles signals outside process context
Summary: gnbd handles signals outside process context
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Cluster Suite
Classification: Retired
Component: gnbd
Version: 4
Hardware: All
OS: Linux
medium
high
Target Milestone: ---
Assignee: Ben Marzinski
QA Contact: Cluster QE
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2006-10-12 08:26 UTC by Bryn M. Reeves
Modified: 2009-04-16 19:58 UTC (History)
2 users (show)

Fixed In Version: RHBA-2007-0144
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2007-05-10 21:06:11 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2007:0144 0 normal SHIPPED_LIVE gnbd-kernel bug fix update 2007-05-10 21:06:09 UTC

Description Bryn M. Reeves 2006-10-12 08:26:40 UTC 
Description of problem:
Processes accessing a GFS filesystem backed by gnbd devices become stuck in D
state. 

At the time of the hangs messages appear on the client nodes from gnbd:

Sep  4 14:06:01 HPC2 sshd(pam_unix)[18706]: session closed for user jopan
Sep  4 14:08:54 HPC2 kernel: gnbd (pid 18821: MakeNearBnBtJPE) got signal 9
Sep  4 14:08:54 HPC2 kernel: gnbd5: Send control failed (result -4)
Sep  4 14:10:17 HPC2 sshd(pam_unix)[18844]: session opened for user jopan by (uid=0)
Sep  4 14:10:19 HPC2 sshd(pam_unix)[18844]: session closed for user jopan

It looks like sock_xmit is being called via do_gnbd_request and gnbd_send_req
outside process context (softirq?).

At this time, current evaluates to the last process to be scheduled instead of
the gnbd thread. If the process happens to have a signal pending when we return
from sock_sendmsg, sock_xmit incorrectly dequeues it and returns -EINTR.

We should only attempt signal handling when running in the context of the gnbd
thread.
Comment 5 Red Hat Bugzilla 2007-05-10 21:06:11 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2007-0144.html
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