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Bug 1583241 - setroubleshoot-server dies trying to open SELinux policy file /sys/fs/selinux/policy
Summary: setroubleshoot-server dies trying to open SELinux policy file /sys/fs/selinux...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: setroubleshoot
Version: 7.5
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Vit Mojzis
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2018-05-28 14:22 UTC by Renaud Métrich
Modified: 2024-03-25 15:05 UTC (History)
6 users (show)

Fixed In Version: setroubleshoot-3.2.30-6.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2019-08-06 13:00:39 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2019:2168 0 None None None 2019-08-06 13:00:47 UTC

Description Renaud Métrich 2018-05-28 14:22:48 UTC 
Description of problem:

Sometimes, if the /sys/fs/selinux/policy file is already being processed by some other tool (e.g. "seinfo"), setroubleshootd daemon fails to start with "server.py:702:RunFaultServer:ValueError: unable to open /sys/fs/selinux/policy:  Device or resource busy"


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

setroubleshoot-server-3.2.29-3.el7


How reproducible:

Often using the reproducer below:


Steps to Reproduce:
1. In a terminal, run "seinfo" in loop

  # while :; do seinfo; done

2. In the GUI, start the SELinux Troubleshooter applet ("sealert")

Actual results:

# abrt-cli ls
id 4b008c272b2d6c24b3378be400d4912e7aaae210
reason:         server.py:702:RunFaultServer:ValueError: unable to open /sys/fs/selinux/policy:  Device or resource busy
time:           Mon 28 May 2018 04:17:13 PM CEST
cmdline:        /usr/bin/python -Es /usr/sbin/setroubleshootd -f ''
package:        setroubleshoot-server-3.2.29-3.el7
uid:            995 (setroubleshoot)
Directory:      /var/spool/abrt/Python-2018-05-28-16:17:13-3416
Run 'abrt-cli report /var/spool/abrt/Python-2018-05-28-16:17:13-3416' for creating a case in Red Hat Customer Portal

The Autoreporting feature is disabled. Please consider enabling it by issuing
'abrt-auto-reporting enabled' as a user with root privileges


Expected results:

More tries opening the file?
Comment 2 Petr Lautrbach 2018-05-29 06:46:30 UTC 
I guess you can't avoid some kind of backtrace on one or other side in these situations. But we could race to who will get the file first during pre-defined timeout like this:

diff --git a/framework/src/setroubleshoot/server.py b/framework/src/setroubleshoot/server.py
index e320ae2..b491578 100755
--- a/framework/src/setroubleshoot/server.py
+++ b/framework/src/setroubleshoot/server.py
@@ -698,8 +698,18 @@ def goodbye(database):
     audit2why.finish()
 
 def RunFaultServer(timeout=10):
-    # FIXME
-    audit2why.init()
+
+    signal.alarm(timeout)
+    while True:
+        try:
+            audit2why.init()
+            signal.alarm(0)
+            break
+        except ValueError as e:
+            if "Device or resource busy" in str(e):
+                continue
+            raise e
+
     global host_database, analysis_queue, email_recipients
 
     signal.signal(signal.SIGHUP, sighandler)
Comment 3 Vit Mojzis 2019-01-10 10:49:16 UTC 
https://github.com/fedora-selinux/setroubleshoot/pull/78
Comment 14 errata-xmlrpc 2019-08-06 13:00:39 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:2168
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