[Expired for QEMU because there has been no activity for 60 days.]
** Changed in: qemu
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1073952
Title:
data sent to serial interface gets truncated after 64kb
Status in QEMU:
Expired
Bug description:
When sending more than 64kb of data to the serial interface in a short
timespan, the data seems to disappear.
I tested it with the latest release (qemu-kvm-1.2.0-rc2.tar.gz) where
the bug still occurs. I stumbled upon it when I upraged my qemu
version. The bug did not occur in the last version i had (0.12.5).
You can reproduce it as follows:
1. Start a dd or cat command in one terminal and pipe the output to a
netcat. The testfile has to be larger than 64kb. I used one that had
93kb and did contain only ascii text.
$ dd if=<TESTFILE> | nc -l 127.0.0.1 65432
or
$ cat <TESTFILE> | nc -l 127.0.0.1 65432
2. Start a qemu and let the first serial port connect to the listening
netcat. I suppose that the testsystem can be any system that does not
read from the serial port on its own (e.g. during boot process). I
used a self compiled minimal linux.
$ qemu -cdrom <TESTSYSTEM> -serial tcp:127.0.0.1:65432
3. When the testsystem is booted, read from the serial device and
write it to a file.
$ dd if=/dev/ttyS0 of=/tmp/testFile
or
$ cat /dev/ttyS0 > /tmp/testFile
The result in almost all of my testruns is, that the /tmp/testFile does only
has the size of 64kb. The rest of the data vanished. In some cases the file was
slightly bigger (65kb or 67kb) but allways under 70kb. The complete file (93kb)
was not trasmitted in any of the runs.
I hope my explanation is exactly enough for you to reproduce it.
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