Opened 11 years ago

Closed 11 years ago

#8547 closed defect (fixed)

Mythcommflag broken in trunk

Reported by: km@… Owned by: danielk
Priority: minor Milestone: 0.24
Component: MythTV - Mythcommflag Version: Master Head
Severity: low Keywords:
Cc: Ticket locked: no


As late as today (revision 25063) mythcommflag has serious problems.

The trivial one is from Changeset 24694 for trunk/mythtv/programs/mythcommflag/main.cpp.

@@ -868,5 +872,5 @@

QString outputfilename = QString::null;

  • QString chanid;

+ uint chanid;

QString starttime; QString allStart = "19700101000000";

which makes chanid an uninitialized uint, which causes the test to fail in

--- @@ -1285,6 +1290,6 @@


if ((chanid.isEmpty() && !starttime.isEmpty())
  • (!chanid.isEmpty() && starttime.isEmpty()))
+ if ((!chanid && !starttime.isEmpty())

+ (chanid && starttime.isEmpty()))


VERBOSE(VB_IMPORTANT, "You must specify both the Channel ID "


As a result mythcommflag with no arguments will always fail with the message above and terminate.

The more serious problem is a non-deterministic one. Even when mythcommflag is invoked with a file argument, it will often segfault in the middle of processing the file. If run repeatedly on the same file it segfaults at different frame numbers in each run. I'm attaching gdb output of successive runs.

Attachments (1)

gdb (10.8 KB) - added by km@… 11 years ago.
gdb output showing segfaults at different frames

Download all attachments as: .zip

Change History (5)

Changed 11 years ago by km@…

Attachment: gdb added

gdb output showing segfaults at different frames

comment:1 Changed 11 years ago by danielk

Milestone: unknown0.24
Owner: changed from cpinkham to danielk
Priority: majorminor
Severity: mediumlow
Status: newaccepted

The chanid bug is mine. The random crashes are unrelated and at least a few months old.

comment:2 Changed 11 years ago by km@…

I didn't see these segfaults on a build from the trunk as recently as May 30. What ever segfaults I've seen in the past have been on corrupted recordings and were deterministic. These occur on good recordings and get caught in different frames in repeated trials on the same recording. Sometimes it even gets all the way through.

comment:3 Changed 11 years ago by markk

re. the mythcommflag crashes, can you please attached the output of a crash instance with '-v playback' logging.

It would also help if you could confirm whether or not you see this behaviour if you roll back to r24971 (i.e. before the libmythui-osd branch was merged into trunk).

comment:4 Changed 11 years ago by danielk

Resolution: fixed
Status: acceptedclosed

(In [25079]) Fixes #8547. Fixes the first reported problem. Please open a new ticket for the other problem.

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