<Ulan> Are there any other maps (besides the free space map) around the
broken slots?
In most of the dumps we get the slot pointer lands in the middle of a
zeroed out region and crashpad doesn't collect the memory beyond it. But
occasionally get lucky, for example (v8 at
63edc02cda79436625d5bc9a9b608857722a56bd):
rax=0000000000000001 rbx=000001e6d6bedc00 rcx=000001e6cc91ad20
rdx=0000135413c43340 rsi=0000000000000000 rdi=0000000000000000
rip=00007fff2f039c9d rsp=00000091ddbfd0a0 rbp=000001e6cd5109b8
r8=00005fa57213dee1 r9=000001e6cc91ad20 r10=000001e6cc91ae60
r11=0000000000000000 r12=0000135413c43340 r13=0000000000000100
r14=0000000000000660 r15=0000000000000013
iopl=0 nv up ei pl zr na po nc
cs=0033 ss=0000 ds=0000 es=0000 fs=0053 gs=002b
efl=00010246
v8::internal::MemoryChunk::InYoungGeneration+0x2:
00007fff`2f039c9d f6460818 test byte ptr [rsi+8],18h
ds:00000000`00000008=??
code_space 0x4b4de89c0000
map_space 0x713198180000
ro_space 0x6fa75d840000
isolate 0x1e6c98eef90
00005fa5`7213de60 ????????`????????
00005fa5`7213de68 00000000`00000000
00005fa5`7213de70 00000000`00000000
00005fa5`7213de78 00000000`00000000
00005fa5`7213de80 00000c64`0b582ac9
00005fa5`7213de88 00006fa7`5d840c21
00005fa5`7213de90 00006fa7`5d840c21 <- what is this? (also in ro_space,
lots of references to it across the dump)
00005fa5`7213de98 00005fa5`7213de21
00005fa5`7213dea0 41258000`00000000
00005fa5`7213dea8 00006fa7`5d840139 <- first item in ro_space in this
build (I believe): FREE_SPACE_TYPE
00005fa5`7213deb0 00000fb0`00000000 <- size of the free space
00005fa5`7213deb8 00000000`00000000
00005fa5`7213dec0 00000000`00000000
00005fa5`7213dec8 00000000`00000000
00005fa5`7213ded0 00000000`00000000
00005fa5`7213ded8 00000000`00000000
00005fa5`7213dee0 00000000`00000000
00005fa5`7213dee8 00000000`00000000
00005fa5`7213def0 00000000`00000000
00005fa5`7213def8 00000000`00000000
00005fa5`7213df00 00000000`00000000
00005fa5`7213df08 00000000`00000000
00005fa5`7213df10 00000000`00000000
00005fa5`7213df18 00000000`00000000
00005fa5`7213df20 00000000`00000000
00005fa5`7213df28 00000000`00000000
00005fa5`7213df30 00000000`00000000
00005fa5`7213df38 00000000`00000000
00005fa5`7213df40 00000000`00000000
00005fa5`7213df48 00000000`00000000
00005fa5`7213df50 00000000`00000000
00005fa5`7213df58 00000000`00000000
00005fa5`7213df60 00000000`00000000
00005fa5`7213df68 00000000`00000000
00005fa5`7213df70 00000000`00000000
00005fa5`7213df78 00000000`00000000
00005fa5`7213df80 00000000`00000000
00005fa5`7213df88 00000000`00000000
00005fa5`7213df90 00000000`00000000
00005fa5`7213df98 00000000`00000000
00005fa5`7213dfa0 00000000`00000000
00005fa5`7213dfa8 00000000`00000000
00005fa5`7213dfb0 00000000`00000000
00005fa5`7213dfb8 00000000`00000000
00005fa5`7213dfc0 00000000`00000000
00005fa5`7213dfc8 00000000`00000000
00005fa5`7213dfd0 00000000`00000000
00005fa5`7213dfd8 00000000`00000000
00005fa5`7213dfe0 00000000`00000000
00005fa5`7213dfe8 00000000`00000000
00005fa5`7213dff0 00000000`00000000
00005fa5`7213dff8 00000000`00000000
00005fa5`7213e000 00000000`00000000
00005fa5`7213e008 00000000`00000000
00005fa5`7213e010 00000000`00000000
00005fa5`7213e018 00000000`00000000
00005fa5`7213e020 00000000`00000000
00005fa5`7213e028 00000000`00000000
00005fa5`7213e030 00000000`00000000
00005fa5`7213e038 00000000`00000000
00005fa5`7213e040 00000000`00000000
00005fa5`7213e048 00000000`00000000
00005fa5`7213e050 00000000`00000000
00005fa5`7213e058 00000000`00000000
00005fa5`7213e060 ????????`????????
In *frame 02* 00000091`ddbfd0a0 00007fff`2f0400af
v8::internal::Scavenger::ScavengeObject<v8::internal::FullHeapObjectSlot>
0:000> dx -r1 p
p [Type: v8::internal::FullHeapObjectSlot]
[+0x000] ptr_ : 0x135413c43340 [Type: unsigned __int64]
0:000> dx -r1 object
object [Type: v8::internal::HeapObject]
[+0x000] ptr_ : 0x5fa57213dee1 [Type: unsigned __int64]
00001354`13c432b8 ????????`????????
00001354`13c432c0 00001354`13c55619
00001354`13c432c8 0000000f`00000000
00001354`13c432d0 00006fa7`5d840371
00001354`13c432d8 4137270d`00000000
00001354`13c432e0 00004a75`021a18d9
00001354`13c432e8 00006fa7`5d840c21
00001354`13c432f0 00001354`13c47b49
00001354`13c432f8 0000000f`00000000
00001354`13c43300 00004a75`021a18d9
00001354`13c43308 00006fa7`5d840c21
00001354`13c43310 00001354`13c556b1
00001354`13c43318 0000000f`00000000
00001354`13c43320 00006fa7`5d840371
00001354`13c43328 4137270d`00000000
00001354`13c43330 00004a75`021a1979
00001354`13c43338 00006fa7`5d840c21
00001354`13c43340 00000000`00000001 <- "tagged nullptr" written by
HeapObjectReference::Update(p, dest);
00001354`13c43348 00000128`00000000
00001354`13c43350 00001e82`f90233b9
00001354`13c43358 00006fa7`5d840c21
00001354`13c43360 00006fa7`5d840c21
00001354`13c43368 00001354`13c47af9
00001354`13c43370 00001354`13c47b21
00001354`13c43378 00006fa7`5d8404d1
00001354`13c43380 00006fa7`5d8404d1
00001354`13c43388 00004a75`021a18d9
00001354`13c43390 00006fa7`5d840c21
00001354`13c43398 00001b18`65a7b9f9
00001354`13c433a0 00000003`00000000
00001354`13c433a8 00004a75`021a18d9
00001354`13c433b0 00006fa7`5d840c21
00001354`13c433b8 00001b18`65a7ba91
00001354`13c433c0 00000003`00000000
00001354`13c433c8 00001e82`f90233b9
00001354`13c433d0 00006fa7`5d840c21
00001354`13c433d8 00006fa7`5d840c21
00001354`13c433e0 00001354`13c47ab9
00001354`13c433e8 00001354`13c47ad9
00001354`13c433f0 00006fa7`5d8404d1
00001354`13c433f8 00006fa7`5d8404d1
00001354`13c43400 00001e82`f90233b9
00001354`13c43408 00006fa7`5d840c21
00001354`13c43410 00006fa7`5d840c21
00001354`13c43418 00000000`00000000
00001354`13c43420 00000000`00000000
00001354`13c43428 00006fa7`5d8404d1
00001354`13c43430 00006fa7`5d8404d1
00001354`13c43438 00004a75`021a18d9
00001354`13c43440 00006fa7`5d840c21
00001354`13c43448 000067cc`bb9f75b9
00001354`13c43450 0000001e`00000000
00001354`13c43458 00004a75`021a18d9
00001354`13c43460 00006fa7`5d840c21
00001354`13c43468 000067cc`bb9f7721
00001354`13c43470 0000001e`00000000
00001354`13c43478 00006fa7`5d840139
00001354`13c43480 000007b8`00000000
00001354`13c43488 00001354`13c42e89
00001354`13c43490 00000002`00000000
00001354`13c43498 00000dc6`ab69dfab
00001354`13c434a0 00000000`00000003
00001354`13c434a8 00006fa7`5d8402d1
00001354`13c434b0 00000002`00000000
00001354`13c434b8 00000000`00000003
00001354`13c434c0 ????????`????????
00006fa7`5d840c20 00006fa7`5d8407b1
00006fa7`5d840c28 00000000`00000000
00006fa7`5d840c30 00006fa7`5d840c61
00006fa7`5d840c38 c0100000`00000000
00006fa7`5d840c40 00006fa7`5d840cb1
00006fa7`5d840c48 fffffffc`00000000
00006fa7`5d840c50 00006fa7`5d8404b1
00006fa7`5d840c58 00000004`00000000
00006fa7`5d840c60 00006fa7`5d840189
00006fa7`5d840c68 19000043`21000006
00006fa7`5d840c70 00000000`084003ff
00006fa7`5d840c78 00006fa7`5d8401d9
00006fa7`5d840c80 00006fa7`5d8401d9
00006fa7`5d840760 00006fa7`5d840189
00006fa7`5d840768 19000048`01000000
00006fa7`5d840770 00000000`084003ff
00006fa7`5d840778 00006fa7`5d8401d9
00006fa7`5d840780 00006fa7`5d8401d9
00006fa7`5d840788 00006fa7`5d840259
00006fa7`5d840790 00000000`00000000
00006fa7`5d840798 00006fa7`5d8402c1
00006fa7`5d8407a0 00000000`00000000
00006fa7`5d8407a8 00000000`00000000
00006fa7`5d8407b0 00006fa7`5d840189
00006fa7`5d8407b8 1800007d`14000000
00006fa7`5d8407c0 00000000`004003ff
00006fa7`5d8407c8 00006fa7`5d8401d9
00006fa7`5d8407d0 00006fa7`5d8401d9
00006fa7`5d8407d8 00006fa7`5d840259
00006fa7`5d8407e0 00000000`00000000
00006fa7`5d8407e8 00006fa7`5d8402c1
00006fa7`5d8407f0 00000000`00000000
00006fa7`5d8407f8 00000000`00000000
00006fa7`5d840800 00006fa7`5d840189
00006fa7`5d840808 1800007d`14000000
00006fa7`5d840810 00000000`004003ff
00006fa7`5d840818 00006fa7`5d8401d9
00006fa7`5d840820 00006fa7`5d8401d9
00006fa7`5d840828 00006fa7`5d840259
00006fa7`5d840830 00000000`00000000
00006fa7`5d840838 00006fa7`5d8402c1
00006fa7`5d840840 00000000`00000000
00006fa7`5d840848 00000000`00000000
00006fa7`5d840850 00006fa7`5d840189
00006fa7`5d840858 19000080`14000000
00006fa7`5d840860 00000000`084003ff
00006fa7`5d840868 00006fa7`5d8401d9
00006fa7`5d840870 00006fa7`5d8401d9
00006fa7`5d840878 00006fa7`5d840259
00006fa7`5d840880 00000000`00000000
00006fa7`5d840888 ????????`????????
Any useful?
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