GCJ 3.3 crash with string handling reproduceable case

Wed Feb 26 14:17:00 GMT 2003

>Ranjit Mathew writes:
> >
> > BTW, as Jeff had pointed out earlier, the "gctest" from the GC
> > always crashes immediately for me as well with a GPF.
>>Well, that's the thing to fix first, before doing _anything_ with gcj.
>If the gc isn't reliable, nothing is reliable.
>>Andrew.

:-( Yes, it isn't encouraging at all, is it? Especially when
GCJ/Win32 *seems* to work otherwise...
I just downloaded Boehm GC 6.1 from:
 http://www.hpl.hp.com/personal/Hans_Boehm/gc/gc_source/
and was easily able to compile it with MSYS/MinGW, including
the gctest application. Sure enough, gctest crashes on me
(consistently) and here's what DrMinGW (always) tells me:
------------------------------- 8< ----------------------------------
gctest.exe caused an Access Violation at location 77f85c41 in module 
ntdll.dll Writing to location 00000010.
Registers:
eax=00000000 ebx=00000000 ecx=0041e0d0 edx=00000050 esi=0041e0c0 
edi=00000000
eip=77f85c41 esp=0022fe30 ebp=0022fe90 iopl=0 nv up ei pl zr na po 
nc
cs=001b ss=0023 ds=0023 es=0023 fs=0038 gs=0000 
efl=00000246
Call stack:
77F85C41 ntdll.dll:77F85C41 RtlReAllocateHeap
77F85BD1 ntdll.dll:77F85BD1 RtlReAllocateHeap
00403362 gctest.exe:00403362 WinMain test.c:1618
int WinMain(
	HINSTANCE instance = &{
		int i = 9460301
	},
	HINSTANCE prev = &{
		int i =
	},
	LPSTR cmd = &0,
	int n = 10
)
	...
	# endif
	# if NTEST > 0
>	 for (i = 0; i < NTEST; i++) {
	 h[i] = GC_CreateThread(NULL, 0, thr_run_one_test, 0, 0, &thread_id);
	 if (h[i] == (HANDLE)NULL) {
	...
00411573 gctest.exe:00411573 GC_register_dynamic_libraries dyn_load.c:837
void GC_register_dynamic_libraries(
)
	...
	 base = p;
	}
>	limit = new_limit;
	 }
	}
	...
0040116B gctest.exe:0040116B
00401013 gctest.exe:00401013
77EA847C KERNEL32.dll:77EA847C DebugBreak
------------------------------- 8< ----------------------------------
The standard output of gctest shows lots of lines like:
------------------------------- 8< ----------------------------------
Warning: changing type size from 8 to 64
Warning: changing type size from 8 to 64
Warning: changing type size from 2 to 16
Warning: changing type size from 2 to 16
Warning: changing type size from 1 to 8
Warning: changing type size from 1 to 8
Warning: changing type size from 8 to 64
Warning: changing type size from 8 to 64
Warning: changing type size from 2 to 16
Warning: changing type size from 2 to 16
...
------------------------------- 8< ----------------------------------
Ranjit.
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