[Bug 956] New: HylaFAX faxgetty on FreeBSD taking 100% CPU

http://bugs.hylafax.org/show_bug.cgi?id=956

           Summary: HylaFAX faxgetty on FreeBSD taking 100% CPU
           Product: HylaFAX
           Version: 6.0.6
          Platform: All
        OS/Version: FreeBSD
            Status: NEW
          Severity: minor
          Priority: P4
         Component: faxgetty
        AssignedTo: [email protected]
        ReportedBy: [email protected]


Daren Russell reports the below on hylafax-users. This is not thought to be a
bug in HylaFAX, but documenting here for completeness. -d

   Hi

   I have just installed hylafax 6.0.6 on FreeBSD 10 from ports, and on
   running the faxgetty process climbs and stays at 100% CPU.  It seems
   other FreeBSD users have had a similar experience according to a PR that
   was opened.  On a previous release it worked ok, but the server died
   (BSD 8.2) and I can not remember what version of Hylafax it was running.

   I've asked on the FreeBSD list about this and it was suggested there
   might a a bug, quoting the reply from Konstantin (who I have Cc'd with
   this email)

   "I once looked at the source code of the program, and the ktrace reports
   in the mentioned PR 166071 are consistent with what I remember I saw in
   code, as well as what was discussed at that time.

   If you look at the kdump, you note the series of read(2) syscalls on the
   same FIFO, which return 0, the indicator of the EOF.  AFAIR, the Hylafax
   code does  not check for the EOF condition and just spins trying to
   read more data.  Select(2) returns the fd for EOF'ed FIFO ready, because
   the read(2) indeed does not block at EOF."

   I unfortunately know absolutely nothing about these things, but if
   somebody could give their thoughts and insights into this, maybe the
   root cause can be found and fixed.

   Thanks
   Daren


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