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Re: Heap errors behavior is dependent on target machine. [message #45541 is a reply to message #45540]

Sat, 28 November 2015 22:37

jfranks
Messages: 36
Registered: September 2014
Location: Houston, Texas

Member

Thank you for helping us.

Q1. Does the problem occur with e.g. examples/UWords too?

A1. No, the problem does NOT occur with examples/UWord. I compiled
and ran this on machine 'B' and everything worked correctly.
I was able to enter some text, save it to a qtf file, exit the
program without any issues.

Q2. Have you tried memory breakpoint?
http://www.ultimatepp.org/srcdoc$Core$Leaks$en-us.html

A2. Yes we have done that. Memory breakpoint #1 was used to generate
the snapshot of the call-stack (uploaded previously), while in
the debugger.

It seems strange memory break-point #1 was not hit immediately
when the application was run. Instead, break-point #1 did not
engage in the debugger until we tried to exit the application. I
expected it to be the other way around.

Q3. Can you post a couple of lines of log with leak with smallest
breakpoint number?

A3. Yes, I have done that on this response. Also, I was in error when
I said that there were more than 2200 items in the log file.
Actually, there are only 355 items each time we run the
application and then exit. I ran wc on the log-file erroneously
thinking that each line was a memory leak (too many long hours).

174 items + <size 828>
174 items + <size 812>
7 items <various sizes>

I've included the log-file with comments that show where patterns
repeat until the final 7 items are reported. I have not been able
to figure out anything relating to the repeating patters, however,
the last 7 items have to do with a shared library that manages
the serial ports. Each one of the 7 items is caused by a stdc++
string that is part of that library.

As an experiment, I modified that shared library to use const char*
instead of stdc++ strings. For example:

#if 0
const std::string ERR_MSG_PORT_NOT_OPEN = "Serial port not open." ;
const std::string ERR_MSG_PORT_ALREADY_OPEN = "Serial port already open." ;
const std::string ERR_MSG_UNSUPPORTED_BAUD = "Unsupported baud rate." ;
const std::string ERR_MSG_UNKNOWN_BAUD = "Unknown baud rate." ;
const std::string ERR_MSG_INVALID_PARITY = "Invalid parity setting." ;
const std::string ERR_MSG_INVALID_STOP_BITS = "Invalid number of stop bits." ;
const std::string ERR_MSG_INVALID_FLOW_CONTROL = "Invalid flow control." ;
#else
const char* ERR_MSG_PORT_NOT_OPEN = "Serial port not open." ;
const char* ERR_MSG_PORT_ALREADY_OPEN = "Serial port already open." ;
const char* ERR_MSG_UNSUPPORTED_BAUD = "Unsupported baud rate." ;
const char* ERR_MSG_UNKNOWN_BAUD = "Unknown baud rate." ;
const char* ERR_MSG_INVALID_PARITY = "Invalid parity setting." ;
const char* ERR_MSG_INVALID_STOP_BITS = "Invalid number of stop bits." ;
const char* ERR_MSG_INVALID_FLOW_CONTROL = "Invalid flow control." ;
#endif

I compiled and installed the modified serial port shared library
and then re-tested the application. Those last 7 items
disappeared! Also, the other items in the log file that repeated
174 times now repeat only 124 times. I don't know why that changed.

There must be a clue here.

-- Jeff

Attachment: p101-dbg-log.txt
(Size: 3.41KB, Downloaded 380 times)

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