Yes!
Great idea -- 
I will attempt.


----- Original Message -----

    [ 
https://issues.apache.org/jira/browse/PROTON-625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14048701#comment-14048701
 ] 

Rafael H. Schloming commented on PROTON-625:
--------------------------------------------

I think the easiest way to track down this bug would be to put some sort of 
detection inside of pni_map_entry and if it recurses more than some limit, e.g. 
32 times or something, then print out a representation of the maps internal 
structure. It might also help to use a debug build so you have line numbers. Is 
that something you feel comfortable trying? You should be able to find the 
relevant code around line 551 of object.c.

> Biggest Backtrace Ever!
> -----------------------
>
>                 Key: PROTON-625
>                 URL: https://issues.apache.org/jira/browse/PROTON-625
>             Project: Qpid Proton
>          Issue Type: Bug
>          Components: proton-c
>    Affects Versions: 0.7
>            Reporter: michael goulish
>
> I am saving all my stuff so I can repro on demand.
> It doesn't happen every time, but it's about 50%.
> ------------------------------------------
> On one box, I have a dispatch router.
> On the other box, I have 10 clients: 5 Messenger-based receivers, and 5 
> qpid-messaging-based senders.
> Each client will handle 100 addresses, of the form "mick/0" ... "mick/1" ... 
> & c.
> 100 messages will be sent to each address.
> I start the 5 receivers first.  They start OK.  Dispatch router happy & 
> stable.
> Wait a few seconds.
> I start the 5 senders, from a bash script.
> The first sender is already sending when the 2nd, 3rd, 4th start.
> After a few of them start,but before all have finished starting,  a few 
> seconds into the script, the crash occurs.  ( If they all start up 
> successfully, no crash. )
> The crash occurs in the dispatch router.
> Here is the biggest backtrace ever:
> #0  0x0000003cf9879ad1 in _int_malloc (av=0x7f101c000020, bytes=16384) at 
> malloc.c:4383
> #1  0x0000003cf987a911 in __libc_malloc (bytes=16384) at malloc.c:3664
> #2  0x00000039c6c1650a in pni_map_allocate () from 
> /usr/lib64/libqpid-proton.so.2
> #3  0x00000039c6c16a3a in pni_map_ensure () from 
> /usr/lib64/libqpid-proton.so.2
> #4  0x00000039c6c16c45 in pni_map_entry () from /usr/lib64/libqpid-proton.so.2
> #5  0x00000039c6c16c64 in pni_map_entry () from /usr/lib64/libqpid-proton.so.2
> #6  0x00000039c6c16c64 in pni_map_entry () from /usr/lib64/libqpid-proton.so.2
> #7  0x00000039c6c16c64 in pni_map_entry () from /usr/lib64/libqpid-proton.so.2
> #8  0x00000039c6c16c64 in pni_map_entry () from /usr/lib64/libqpid-proton.so.2
> #9  0x00000039c6c16c64 in pni_map_entry () from /usr/lib64/libqpid-proton.so.2
> #10 0x00000039c6c16c64 in pni_map_entry () from /usr/lib64/libqpid-proton.so.2
> #11 0x00000039c6c16c64 in pni_map_entry () from /usr/lib64/libqpid-proton.so.2
> #12 0x00000039c6c16c64 in pni_map_entry () from /usr/lib64/libqpid-proton.so.2
> #13 0x00000039c6c16c64 in pni_map_entry () from /usr/lib64/libqpid-proton.so.2
> #14 0x00000039c6c16c64 in pni_map_entry () from /usr/lib64/libqpid-proton.so.2
> .
> .
> .
> .
> #93549 0x00000039c6c16c64 in pni_map_entry () from 
> /usr/lib64/libqpid-proton.so.2
> #93550 0x00000039c6c16c64 in pni_map_entry () from 
> /usr/lib64/libqpid-proton.so.2
> #93551 0x00000039c6c16c64 in pni_map_entry () from 
> /usr/lib64/libqpid-proton.so.2
> #93552 0x00000039c6c16c64 in pni_map_entry () from 
> /usr/lib64/libqpid-proton.so.2
> #93553 0x00000039c6c16c64 in pni_map_entry () from 
> /usr/lib64/libqpid-proton.so.2
> #93554 0x00000039c6c16c64 in pni_map_entry () from 
> /usr/lib64/libqpid-proton.so.2
> #93555 0x00000039c6c16c64 in pni_map_entry () from 
> /usr/lib64/libqpid-proton.so.2
> #93556 0x00000039c6c16c64 in pni_map_entry () from 
> /usr/lib64/libqpid-proton.so.2
> #93557 0x00000039c6c16c64 in pni_map_entry () from 
> /usr/lib64/libqpid-proton.so.2
> #93558 0x00000039c6c16c64 in pni_map_entry () from 
> /usr/lib64/libqpid-proton.so.2
> #93559 0x00000039c6c16dc0 in pn_map_put () from /usr/lib64/libqpid-proton.so.2
> #93560 0x00000039c6c17226 in pn_hash_put () from 
> /usr/lib64/libqpid-proton.so.2
> #93561 0x00000039c6c2a643 in pn_delivery_map_push () from 
> /usr/lib64/libqpid-proton.so.2
> #93562 0x00000039c6c2c44b in pn_do_transfer () from 
> /usr/lib64/libqpid-proton.so.2
> #93563 0x00000039c6c24385 in pn_dispatch_frame () from 
> /usr/lib64/libqpid-proton.so.2
> #93564 0x00000039c6c2448f in pn_dispatcher_input () from 
> /usr/lib64/libqpid-proton.so.2
> #93565 0x00000039c6c2d68b in pn_input_read_amqp () from 
> /usr/lib64/libqpid-proton.so.2
> #93566 0x00000039c6c3011a in pn_io_layer_input_passthru () from 
> /usr/lib64/libqpid-proton.so.2
> #93567 0x00000039c6c3011a in pn_io_layer_input_passthru () from 
> /usr/lib64/libqpid-proton.so.2
> #93568 0x00000039c6c2d275 in transport_consume () from 
> /usr/lib64/libqpid-proton.so.2
> #93569 0x00000039c6c304cd in pn_transport_process () from 
> /usr/lib64/libqpid-proton.so.2
> #93570 0x00000039c6c3e40c in pn_connector_process () from 
> /usr/lib64/libqpid-proton.so.2
> #93571 0x00007f1060c60460 in process_connector () from 
> /home/mick/dispatch/build/libqpid-dispatch.so.0
> #93572 0x00007f1060c61017 in thread_run () from 
> /home/mick/dispatch/build/libqpid-dispatch.so.0
> #93573 0x0000003cf9c07851 in start_thread (arg=0x7f1052bfd700) at 
> pthread_create.c:301
> #93574 0x0000003cf98e890d in clone () at 
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:115



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