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:
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 ?? ()
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