[Python-Dev] What's the best way to debug python3 source code? (for this bug: http://bugs.python.org/issue15068) (original) (raw)

Terry Reedy tjreedy at udel.edu
Mon Jun 18 18:49:02 CEST 2012

On 6/18/2012 7:10 AM, gmspro wrote:

I'm working on this bug, http://bugs.python.org/issue15068

Oh. From your first message, I thought you were asking about a personal bug. I will mention that real names are customary on this list. (Unless you have a good professional reason otherwise.) They are also necessary for contributor forms, which we need from anyone submitting an acceptable patch large enough to be covered by copyright.

I tried this with gdb (gdb)run >>>from sys import stdin >>>str=sys.stdin.read() blabla blabla blabla CTRL+D CTRL+D >>>CTRL+C (gdb)backtrace

The backtrace is from when you hit ^C after the prompt and should have nothing to do with the double ^D behavior, except that it shows what we would like to the state after the first ^D.

_0xb7f08348 in newselectnocancel () at ../sysdeps/unix/syscall-template.S:82 82 ../sysdeps/unix/syscall-template.S: No such file or directory. in ../sysdeps/unix/syscall-template.S Current language: auto The current source language is "auto; currently asm".

It appears you interrupted in a system call written in assembler.

(gdb) backtrace _#0 0xb7f08348 in newselectnocancel () at ../sysdeps/unix/syscall-template.S:82 #1 0xb7b43f9f in readlineuntilenterorsignal (prompt=0xb7b578d0 ">>> ", signal=0xbfffed54) at /home/user1/python/Python-3.2.3/Modules/readline.c:987

As far as Python goes, you were at line 987 of readline.c in readline_until_enter_or_signal(prompt, signal) where prompt was ">>>".

I would try again twice, hitting ^C once before and once after the first ^D. This should tell you where Python and the system is when it receives ^D and should return to the prompt (as in the backtrace you got) and where Python went instead after receiving ^D and where it is when it gets the second ^D and does return.

-- Terry Jan Reedy

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