[avrdude-dev] [bug #46618] Arithmetic exception (SIGFPE) in ser_setspeed

[anonymous]

URL:
  <http://savannah.nongnu.org/bugs/?46618>

                 Summary: Arithmetic exception (SIGFPE) in ser_setspeed
                 Project: AVR Downloader/UploaDEr
            Submitted by: None
            Submitted on: Sun 06 Dec 2015 08:10:30 PM UTC
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: Tom Hall
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any

    _______________________________________________________

Details:

Note: possible duplicate of #46610, but I can't say for sure, so I'll submit
it as a separate report and leave it to those who know to mark duplicates.

Using Arch Linux arm on an arm Cortex-A9 (armv7h). avrdude is version 6.2.

Attempting to program an arduino micro using the arduino-mk makefiles. It
calls avrdude with the following arguments:
avrdude -q -V -p atmega32u4 -D -c avr109 -b 57600 -P /dev/ttyACM0 -U
flash:w:build-micro/ardmk-test.hex:i

This caused a floating point exception, so I rebuilt avrdude with debug
symbols and obtained a backtrace (attached). The exception occurs in
ser_setspeed on line 158 when it attempts to divide by ss.custom_divisor,
having calculated custom_divisor as zero:


  ss.custom_divisor = (ss.baud_base + (speed / 2)) / speed;
  unsigned int closestSpeed = ss.baud_base / ss.custom_divisor;


In this instance, ss.baud_base == 1200 (I assume the ioctl call put it there),
speed == 57600 (from command line args), so custom_divisor is calculated as
zero (would be ~0.52 if they were real numbers instead of ints).



    _______________________________________________________

File Attachments:


-------------------------------------------------------
Date: Sun 06 Dec 2015 08:10:30 PM UTC  Name: Backtrace 1.txt  Size: 9kB   By:
None

<http://savannah.nongnu.org/bugs/download.php?file_id=35654>

    _______________________________________________________

Reply to this item at:

  <http://savannah.nongnu.org/bugs/?46618>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.nongnu.org/