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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