[Nfd-dev] [Operators] "No buffer space available"

[Dehart, John]

On Sep 6, 2017, at 3:49 AM, Davide Pesavento <davide.pesavento at lip6.fr<mailto:davide.pesavento at lip6.fr>> wrote:

On Tue, Sep 5, 2017 at 7:57 PM, Dehart, John <jdd at wustl.edu<mailto:jdd at wustl.edu>> wrote:

On Sep 5, 2017, at 11:36 AM, Davide Pesavento <davide.pesavento at lip6.fr<mailto:davide.pesavento at lip6.fr>> wrote:

On Tue, Sep 5, 2017 at 5:23 PM, Dehart, John <jdd at wustl.edu<mailto:jdd at wustl.edu>> wrote:

nfd.log file has not been touched in 11 hours:

So nfd is up but not doing anything meaningful? Can you run strace -p
on the stuck nfd?

Too late. I restarted with my updates to change to DEBUG and capture log files.
Yes, it was stuck and not responding to anything. Did attach to it with gdb
to see if that would tell me anything but not sure this really tells us anything:

(gdb) bt
#0  malloc_consolidate (av=av at entry=0x7f6a6de53760 <main_arena>) at malloc.c:4165
#1  0x00007f6a6db1072d in _int_free (av=0x7f6a6de53760 <main_arena>, p=<optimized out>, have_lock=0) at malloc.c:4059
#2  0x00007f6a6f50baf7 in std::_Sp_counted_ptr<ndn::Buffer*, (__gnu_cxx::_Lock_policy)2>::_M_dispose() () from /usr/lib/x86_64-linux-gnu/libndn-cxx.so.0.5.1
#3  0x000000000045b639 in std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release() ()
#4  0x0000000000472e44 in ?? ()
#5  0x000000000047c267 in ?? ()
#6  0x000000000047c393 in ?? ()
#7  0x000000000047a567 in ?? ()
#8  0x000000000044eff4 in boost::asio::detail::task_io_service::run(boost::system::error_code&) ()
#9  0x0000000000450576 in ?? ()
#10 0x00000000004363ff in ?? ()
#11 0x00007f6a6dab2f45 in __libc_start_main (main=0x436060, argc=3, argv=0x7ffff81bf138, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffff81bf128) at libc-start.c:287
#12 0x0000000000449399 in ?? ()
(gdb)

When I see it again, I will try strace.

Thanks. A proper gdb backtrace could be useful too, but the above is
not. To make it more useful you need to install the debug symbols for
ndn-cxx and nfd.

What is the penalty for running with the versions with debug symbols?
Should we be doing that at all times or is it a performance killer?


When nfd was stuck, do you know if CPU consumption was at or close to 100%?

No. The CPU usage was close to 0.

John


Thanks,
Davide

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