[DAEMON-186] jsvc consumes 100% CPU when redirecting errfile (and not outfile) to syslog

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.0.1, 1.0.2, 1.0.4, 1.0.5
• Fix Version/s: 1.0.6
• Component/s: Jsvc

Environment

Ubuntu

• Assignee: Mladen Turk
• Reporter: Ana Solano Ros
• Created: 04/Nov/10 14:14
• Updated: 06/Jun/11 14:55
• Resolved: 06/Jun/11 14:55

Description

When you run jsvc redirecting -errfile to syslog but not -outfile to syslog the jsvc process in charge of the redirection to syslog daemon consumes 100% CPU.
The problem dissapears when redirecting both (-errfile and -outfile) to syslog.
The problem appears when only one is redirected to syslog and the other parameter is not specified or redirected to a file.

The problem in the process appears to be the following:

• jsvc tries to open 2 file descriptors, one for the standard output and one for the error output, and listen to both file descriptors
• when it receives a message from one of both descriptors it sends the message to syslog daemon.
• In the case that only -errfile is specified (and not -outfile), when jsvc tries to open the stardard output file descriptor it fails and the file descriptor points to "0" (default value, /dev/null).
• The jsvc listen to both descriptors, the error output (that was correctly opened) and the 0 file descriptor, and jsvc is receiving data continously from this "broken" file descriptor. So it enters in a loop that consumes 100% of CPU.

Issue Links

• is blocked by: DAEMON-194 deadloop and no return value in logger_child