[zeromq-dev] segfault in python during poll() (but it's my fault)

Martin Hurton hurtonm at gmail.com
Wed Nov 21 16:49:40 CET 2012


Thanks for report, I will check it.
On Nov 20, 2012 3:18 AM, "Peter Friend" <pfriend at gehrytech.com> wrote:

>  I have a client REQ talking to a ROUTER. I am translating some prototype
> code from python to Java so the ROUTER is in Java and the REQ client is
> python. I was rather perplexed when I got a segfault during poll():****
>
> ** **
>
> socks = dict(polldev.poll(10 * 1000))****
>
> ** **
>
> from strace:****
>
> write(6, "\1\0\0\0\0\0\0\0", 8)         = 8****
>
> write(8, "\1\0\0\0\0\0\0\0", 8)         = 8****
>
> poll([{fd=8, events=POLLIN}], 1, 0)     = 1 ([{fd=8, revents=POLLIN}])****
>
> read(8, "\1\0\0\0\0\0\0\0", 8)          = 8****
>
> poll([{fd=8, events=POLLIN}], 1, 0)     = 0 (Timeout)****
>
> write(6, "\1\0\0\0\0\0\0\0", 8)         = 8****
>
> fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0****
>
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x7fc8abbed000****
>
> write(1, "sending 1\n", 10sending 1****
>
> )             = 10****
>
> poll([{fd=8, events=POLLIN}], 1, 0)     = 1 ([{fd=8, revents=POLLIN}])****
>
> poll([{fd=8, events=POLLIN}], 1, 0)     = 1 ([{fd=8, revents=POLLIN}])****
>
> read(8, "\1\0\0\0\0\0\0\0", 8)          = 8****
>
> poll([{fd=8, events=POLLIN}], 1, 0)     = 0 (Timeout)****
>
> poll([{fd=8, events=POLLIN}], 1, 10000 <unfinished ...>****
>
> +++ killed by SIGSEGV (core dumped) +++****
>
> ** **
>
> This ended up being caused by the fact that I forgot to put in the empty
> frame for the reply to the REQ. Once I did that everything worked, but I
> wouldn't expect this to cause a segfault. I am working on a Java REQ client
> as well to verify whether it's a core library issue. I am using my own
> build of libzmq from the master branch I built today.****
>
> ** **
>
> Thanks,****
>
> ** **
>
> Peter**
>
> ** **
>
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>
>
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