More testing of Shuffler - Pike-devel

28 Aug 2004


      Hi,
I discover another crash with the Shuffler. Here is a test case:
#!/usr/local/bin/pike
void shuffle_filename()
{
   object shuffler;
   object shuffle;
   shuffler = Shuffler.Shuffler();
   object stdin = Stdio.File();
   mapping options = ([ "stdin": stdin,
                        "stdout": Stdio.stdout->pipe() ]);
   stdin = stdin->pipe();
   Process.create_process(({ "/bin/ls" }), options);
   shuffle = shuffler->shuffle(stdin);
   // don't crash if i put data in the string
   //string data = "foobarzonk";
   // crash if empty string
   string data = "";
   shuffle->add_source(data);
   function foo = lambda() { destruct(stdin);};
   // doesn't crash if i don't put write
   write("crash me! %O\n", 1);
   shuffle->set_done_callback(foo);
   shuffle->start();
}
int main(int argc, array argv)
{
   shuffle_filename();
   return -1;
}
With Pike 7.6 it leads to the backtrace:
#0  0x0832d200 in type_stack ()
#1  0x4001cfdd in __send_more_callback (t=0x83be188, amount=8192)
     at Shuffler.cmod:445
#2  0x4001b883 in _send_more (t=0x1) at Shuffler.cmod:291
#3  0x080cf653 in low_backend_once (me=0x83c2398, timeout=0xbffff3d8)
     at backend.cmod:2581
#4  0x080cfb9f in f_Backend_cq__backtick_28_29 (args=-1) at 
backend.cmod:2828
#5  0x0809c90a in low_mega_apply (type=APPLY_SVALUE, args=1, 
arg1=0x83c89fc,
     arg2=0x0) at apply_low.h:214
#6  0x08091be7 in eval_instruction_without_debug (
     pc=0x841f7a5 
"Q\031Q¶1XõÿÿÿJ(OÁR'(¿\227köÿÿÿQ\031Q¶1Q\031Q¶1XØÿÿÿ\001\001!l'") at 
interpret_functions.h:1936
#7  0x0809ee1b in o_catch (
     pc=0x841f7a0 
"Q\031Q¶1Q\031Q¶1XõÿÿÿJ(OÁR'(¿\227köÿÿÿQ\031Q¶1Q\031Q¶1XØÿÿÿ\001\001!l'") 
at /home/david/current-projects/pike/Pike/7.6/src/interpret.c:2053
#8  0x0808e029 in eval_instruction_without_debug (pc=0x841f79c "\023")
     at interpret_functions.h:1236
#9  0x0809ec28 in mega_apply (type=APPLY_STACK, args=0, arg1=0x0, arg2=0x0)
     at /home/david/current-projects/pike/Pike/7.6/src/interpret.c:2012
#10 0x080a0a10 in apply (o=0x83b9b10, fun=0x8285d4c "_main", args=0)
     at /home/david/current-projects/pike/Pike/7.6/src/interpret.c:2392
#11 0x08130c6b in main (argc=2, argv=0xbffffc34)
     at /home/david/current-projects/pike/Pike/7.6/src/main.c:839
But sometime I also get this one (from a similar program with pipe and 
process.create_process and still with empty string as source):
#0  0x00000040 in ?? ()
#1  0x407098be in _set_callbacks (t=0x8ae1c98) at Shuffler.cmod:298
#2  0x0809c90a in low_mega_apply (type=APPLY_LOW, args=0, arg1=0x83c8a7c,
     arg2=0xc) at apply_low.h:214
#3  0x080926e6 in eval_instruction_without_debug (
     pc=0x8add484 
"}\003\001Ä\vÇ\fE\001\035\005\005\a\026l='\001\035\006B\233\006\001\026\nd\017") 
at interpret_functions.h:1995
#4  0x0809ee1b in o_catch (pc=0x86fc592 "!\033Í")
     at /home/david/current-projects/pike/Pike/7.6/src/interpret.c:2053
#5  0x0808e029 in eval_instruction_without_debug (pc=0x86fc58e "\r")
     at interpret_functions.h:1236
#6  0x0809ee1b in o_catch (pc=0x8632d48 "! ¾-E\001e\035")
     at /home/david/current-projects/pike/Pike/7.6/src/interpret.c:2053
#7  0x0808e029 in eval_instruction_without_debug (pc=0x8632d44 "{")
     at interpret_functions.h:1236
#8  0x0809ec28 in mega_apply (type=145629520, args=145629520, 
arg1=0x8ae2150,
     arg2=0x8ae2150)
     at /home/david/current-projects/pike/Pike/7.6/src/interpret.c:2012
#9  0x0809eee5 in f_call_function (args=145629520)
     at /home/david/current-projects/pike/Pike/7.6/src/interpret.c:2076
#10 0x08184044 in new_thread_func (data=0xbfffef70)
     at /home/david/current-projects/pike/Pike/7.6/src/threads.c:868
#11 0x4007ae51 in pthread_start_thread () from /lib/libpthread.so.0
---Type <return> to continue, or q <return> to quit---
#12 0x4007aecf in pthread_start_thread_event () from /lib/libpthread.so.0
#13 0x401ca6ca in clone () from /lib/libc.so.6
/ David