<html> <head> <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#FFFFFF" text="#000000"> Thanks for the problem report. It appears to be a bug, I'm working on it. Kevin #0  0x00007ffff7265473 in poll () from /lib/x86_64-linux-gnu/libc.so.6 #1  0x0000000000575a42 in default_sleep (v=<optimized out>, fds=0x7ffff4bc81b0) at ../../../src/racket/gc2/../src/port.c:9815 #2  0x00000000006104bd in check_sleep (need_activity=<optimized out>, sleep_now=1) at ../../../src/racket/gc2/../src/thread.c:3980 #3  0x000000000061e07b in scheme_thread_block (sleep_time=0) at ../../../src/racket/gc2/../src/thread.c:4692 #4  0x0000000000620886 in scheme_out_of_fuel () at ../../../src/racket/gc2/../src/thread.c:4034 #5  scheme_out_of_fuel () at ../../../src/racket/gc2/../src/thread.c:4030 #6  0x000000000056dc3e in places_deep_copy_worker (so=0x7ffff0db4058, ht=0x2, mode=2, gcable=1, can_raise_exn=1, master_chain=0x0, invalid_object=0x0) at ../../../src/racket/gc2/../src/place.c:1764 #7  0x000000000056de11 in do_places_deep_copy (so=<optimized out>, mode=<optimized out>, gcable=<optimized out>, master_chain=<optimized out>, invalid_object=<optimized out>) at ../../../src/racket/gc2/../src/place.c:1098 #8  0x0000000000571582 in scheme_places_deserialize (so=0x7ffff0db4058, msg_memory=0xda1420) at ../../../src/racket/gc2/../src/place.c:2590 #9  0x000000000057171a in scheme_place_async_try_receive (ch=0x7ffff49dd088) at ../../../src/racket/gc2/../src/place.c:3117 #10 0x0000000000571781 in place_channel_ready (so=<optimized out>, sinfo=0x7fffffffcbd0) at ../../../src/racket/gc2/../src/place.c:3143 #11 0x000000000061eef6 in syncing_ready (s=0x7ffff4318668, sinfo=0x7fffffffcd30) at ../../../src/racket/gc2/../src/thread.c:6126 #12 0x000000000061df15 in scheme_thread_block (sleep_time=1.76330559e-06) at ../../../src/racket/gc2/../src/thread.c:4749 #13 0x000000000061eb0c in scheme_block_until (_f=0x61ed00 <syncing_ready>, fdf=0x60e570 <syncing_needs_wakeup>, data=0x7ffff4318668, delay=<optimized out>) at ../../../src/racket/gc2/../src/thread.c:4818 #14 0x000000000061ff50 in do_sync (name=0x6a7c6f "sync/timeout", argc=<optimized out>, argv=0x7ffff5ba9f10, with_break=0, with_timeout=1, _tailok=1) at ../../../src/racket/gc2/../src/thread.c:6486 #15 0x00007ffff7ff75d4 in ?? () #16 0x00007ffff5ba9ec8 in ?? () #17 0x00007ffff49bc36d in ?? () #18 0x00007fffffffd0f8 in ?? () #19 0x0000000000000002 in ?? () #20 0x0000000000000000 in ?? () On 03/13/2012 06:49 AM, Tim Brown wrote: <blockquote cite="mid:4F5F4258.50307@cityc.co.uk" type="cite">Hello, I have written a number of programs that attempt to "farm" work out to a number of places... for example, the attached file which calculates the square of *ALL THE NUMBERS* between 0 and 99 inclusive! Intermittently, this pooling loop stops (usually at the last place)... e.g. 9999999999999999cpu time: 320 real time: 492 gc time: 44 place finished work for 99 It sits waiting forever... and certainly longer than my 1s timeout. In my defence of not paring the program down to its bare minimum; it seems to fail more often with the kind of IO stress I'm putting it under. I ^\ core the program (stack trace below). Linux XXXX 2.6.32-5-amd64 #1 SMP Mon Jan 16 16:22:28 UTC 2012 x86_64 GNU/Linux racket version 5.2, but this happens on any (many) combination of Windows amd64 (6 core)/Linux amd64 (4 core), racket, drracket, 5.2 and 5.2.1 First, is there anything wrong with my logic? (Happy to accept that as an option) Otherwise... what's up? Can I do owt to help? tim-brown on #racket, ping me if you need to know more Tim Brown (gdb) where #0  0x00007f78f77a90e3 in select () from /lib/libc.so.6 #1  0x00007f78f84d59dc in default_sleep (v=<value optimized out>,      fds=0x7f78f8890008) at ./../src/port.c:9318 #2  0x00007f78f8575dc8 in check_sleep (need_activity=<value optimized out>,      sleep_now=1) at ./../src/thread.c:3523 #3  0x00007f78f857da3d in scheme_thread_block (      sleep_time=<value optimized out>) at ./../src/thread.c:4205 #4  0x00007f78f8580b2b in scheme_out_of_fuel () at ./../src/thread.c:3577 #5  0x00007f78f84c6291 in places_deep_copy_worker (so=0x7f78f284c058,      ht=0x7fff75ad3448, mode=<value optimized out>,      gcable=<value optimized out>, can_raise_exn=<value optimized out>)      at ./../src/place.c:1657 #6  0x00007f78f84c63ad in do_places_deep_copy (so=0x7f78f284c058, mode=2,      gcable=1) at ./../src/place.c:1058 #7  0x00007f78f84c6486 in scheme_places_deserialize (so=0x7f78f284c058,      msg_memory=0x7f78e801fc60) at ./../src/place.c:2348 #8  0x00007f78f84c6603 in scheme_place_async_try_receive (ch=0x7f78efae6e98)      at ./../src/place.c:2823 #9  0x00007f78f84c66af in place_channel_ready (so=0x7f78efad6438,      sinfo=0x7fff75ad3670) at ./../src/place.c:2849 #10 0x00007f78f857e848 in syncing_ready (s=0x7f78f6494480,      sinfo=0x7fff75ad37e0) at ./../src/thread.c:5644 #11 0x00007f78f857d839 in scheme_thread_block (      sleep_time=<value optimized out>) at ./../src/thread.c:4266 #12 0x00007f78f857e47a in scheme_block_until (      _f=0x7f78f857e670 <syncing_ready>,      fdf=0x7f78f856fc10 <syncing_needs_wakeup>, data=0x7f78f6494480, delay=0)      at ./../src/thread.c:4335 #13 0x00007f78f857fa70 in do_sync (name=0x7f78f85d93a6 "sync/timeout",      argc=<value optimized out>, argv=0x7f78f6145ee0,      with_break=<value optimized out>, with_timeout=1974287344,      _tailok=<value optimized out>) at ./../src/thread.c:5961 #14 0x00007f78f8a7d727 in ?? () #15 0x00007f78f6145ef8 in ?? () #16 0x00007f78f6510e9f in ?? () #17 0x00007fff75ad3c10 in ?? () #18 0x00007f78f5195f88 in ?? () #19 0x0000000000000000 in ?? () <fieldset class="mimeAttachmentHeader"></fieldset> <pre wrap="">____________________ Racket Users list: <a class="moz-txt-link-freetext" href="http://lists.racket-lang.org/users">http://lists.racket-lang.org/users</a> </pre> </blockquote> </body> </html>