[Yhc] Re: make tests

[Michał Pałka]

Hackers,

I've managed to find more details concerning GC failure on AMD64. The
heap node that causes GC to crash is allocated on modules loading:
#0  cinfo_alloc (size=2, name=0x58a3e0 ":", number=1, flags=0, obj=0x58a360) at info.c:24
#1  0x0000000000403b0f in mod_loadCon (mod=0x52ccf0, name=0x58a3e0 ":", obj=0x58a360) at module.c:463
#2  0x0000000000403ccd in mod_loadObject (mod=0x52ccf0, offs=36277, obj=0x58a360) at module.c:516
#3  0x0000000000402a13 in mod_resolve (module=0x58a380 "Prelude", item=0x58a3a0 ":") at module.c:209
#4  0x0000000000402f0d in mod_loadConstTable (mod=0x588ea0, finfo=0x58a218) at module.c:322
#5  0x0000000000403a4b in mod_loadFun (mod=0x588ea0, name=0x58a1e0 "valid", obj=0x58a160) at module.c:439
#6  0x0000000000403cb4 in mod_loadObject (mod=0x588ea0, offs=1475, obj=0x58a160) at module.c:514
#7  0x0000000000402a13 in mod_resolve (module=0x58a180 "Main", item=0x58a1a0 "valid") at module.c:209
#8  0x0000000000402f0d in mod_loadConstTable (mod=0x588ea0, finfo=0x58a0f0) at module.c:322
#9  0x0000000000403a4b in mod_loadFun (mod=0x588ea0, name=0x58a0c0 "queens", obj=0x58a040) at module.c:439
#10 0x0000000000403cb4 in mod_loadObject (mod=0x588ea0, offs=1580, obj=0x58a040) at module.c:514
#11 0x0000000000402a13 in mod_resolve (module=0x58a060 "Main", item=0x58a080 "queens") at module.c:209
#12 0x0000000000402f0d in mod_loadConstTable (mod=0x588ea0, finfo=0x589fa8) at module.c:322
#13 0x0000000000403a4b in mod_loadFun (mod=0x588ea0, name=0x589f80 "main", obj=0x589f40) at module.c:439
#14 0x0000000000403cb4 in mod_loadObject (mod=0x588ea0, offs=1606, obj=0x589f40) at module.c:514
#15 0x0000000000402a13 in mod_resolve (module=0x7fffffea0b88 "Main", item=0x41f3f1 "main") at module.c:209
#16 0x00000000004046ee in initGlobals (mainMod=0x7fffffea0b88 "Main", mainFunc=0x7fffffea0248, _toplevel=0x7fffffea0250,
    _driver=0x7fffffea0240) at main.c:120
#17 0x0000000000404880 in init (mainMod=0x7fffffea0b88 "Main", mainFunc=0x7fffffea0248, _toplevel=0x7fffffea0250, _driver=0x7fffffea0240)
    at main.c:145
#18 0x00000000004048de in main (argc=4, argv=0x7fffffea0348) at main.c:171

The node represents the (:) constructor which takes 2 arguments (size =
2), but the space allocated is only 1 word (no args[]). Why? Next node
which occupies the next word is treated as pointer to args by the GC
which leads to crash.

Thanks,
Michal


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