Plugins » Katello

Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1752880

Description of problem:

When having the katello-host-tools-tracer package installed on the system, many processes are scanned when a yum operation is performed.
In particular it seems that arguments of these processes are collected, then stat() is issued on the arguments, which is usually non-sense:

-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
15160 15:09:27.340215 stat("--no-daemon", 0x7ffec78c75f0) = 1 ENOENT (No such file or directory) <0.000012>
15160 15:09:27.376073 stat("--keep-baud", 0x7ffec78c75f0) = -1 ENOENT (No such file or directory) <0.000012>
15160 15:09:27.380001 stat("--noclear", 0x7ffec78c75f0) = -1 ENOENT (No such file or directory) <0.000013>
...
------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------

If for some reason a process argument looks like a path name on a remote location which is not accessible (e.g. an automount), this makes the yum process hang indefinitely.

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

katello-host-tools-tracer-3.5.0-2.el7sat.noarch
katello-host-tools-tracer-3.3.5-5.el7sat.noarch

How reproducible:

Always (the "dumb" stats calls at least)

Steps to Reproduce:
1. Execute the following python code

1. strace fttTvyy -o /tmp/tracer.strace -s 4096 -e stat - python << EOF
   import katello.tracer
   print katello.tracer.query_affected_apps()
   EOF

2. Check the strace for "ENOENT"

1. grep -w ENOENT /tmp/tracer.strace | grep -v "/"

Actual results:

-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
...
15160 15:09:27.206950 stat("--system", 0x7ffec78c75f0) = 1 ENOENT (No such file or directory) <0.000011>
15160 15:09:27.206999 stat("--address=systemd:", 0x7ffec78c75f0) = -1 ENOENT (No such file or directory) <0.000010>
15160 15:09:27.207050 stat("--nofork", 0x7ffec78c75f0) = -1 ENOENT (No such file or directory) <0.000010>
15160 15:09:27.207092 stat("--nopidfile", 0x7ffec78c75f0) = -1 ENOENT (No such file or directory) <0.000012>
15160 15:09:27.207136 stat("--systemd-activation", 0x7ffec78c75f0) = -1 ENOENT (No such file or directory) <0.000019>
...
------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------

Expected results:

No stat() done on process arguments, in particular if these are known remote paths

Additional info:

I don't know exactly when these stat calls are performed. It looks like this is done when updating some packages.