[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Reproduceable Segmentation fault while saving images (#444)

[Alistair Grant]

To paraphrase github's error message: `We don't support uploading text files, try again with TXT`.

A short extract:

```
(isMarked(oop)) || (obj == (hiddenRootsObject())) 60126

isPostMobile(fwd) 60129

isMarked(oop) 60112

isPostMobile(fwd) 60115

(isMarked(oop)) || (obj == (hiddenRootsObject())) 60126

isPostMobile(fwd) 60129
Loop: 89
ExternalAddress: 0
Start

objCouldBeClassObj(classObj) 51687

objCouldBeClassObj(classObj) 51687

objCouldBeClassObj(classObj) 51687

objCouldBeClassObj(classObj) 51687

objCouldBeClassObj(classObj) 51687

objCouldBeClassObj(classObj) 51687

objCouldBeClassObj(classObj) 51687

objCouldBeClassObj(classObj) 51687

objCouldBeClassObj(classObj) 51687

objCouldBeClassObj(classObj) 51687

objCouldBeClassObj(classObj) 51687

objCouldBeClassObj(classObj) 51687

objCouldBeClassObj(classObj) 51687

objCouldBeClassObj(classObj) 51687

objCouldBeClassObj(classObj) 51687

Segmentation fault Mon Nov 18 13:20:09 2019


/dev/shm/minimal/vmdbg/lib/pharo/5.0-201911160620/pharo
Pharo VM version: 5.0-201911160620  Mon Nov 18 11:31:44 CET 2019 clang [Debug Spur 64-bit VM]
Built from: CoInterpreter VMMaker.oscog-eem.2585 uuid: 5282e96d-1d2e-4039-a905-429834c37da2 Nov 18 2019
With: StackToRegisterMappingCogit VMMaker.oscog-eem.2585 uuid: 5282e96d-1d2e-4039-a905-429834c37da2 Nov 18 2019
Revision: VM: 201911160620 alistair at alistair-Precision-3541:opensmalltalk-vm/opensmalltalk-vm Date: Fri Nov 15 22:20:29 2019 CommitHash: 21112274a Plugins: 201911160620 alistair at alistair-Precision-3541:opensmalltalk-vm/opensmalltalk-vm
Build host: Linux 2273a8715b2d 5.0.0-36-generic #39~18.04.1-Ubuntu SMP Tue Nov 12 11:09:50 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
plugin path: vmdbg/lib/pharo/5.0-201911160620 [default: /dev/shm/minimal/vmdbg/lib/pharo/5.0-201911160620/]


C stack backtrace & registers:
	rax 0x00000030 rbx 0x00000000 rcx 0x00000270 rdx 0x034c8810
	rdi 0x00000033 rsi 0x00000000 rbp 0x7ffc9e69e070 rsp 0x7ffc9e69de80
	r8  0x00000000 r9  0x00000022 r10 0xffffffde r11 0x00000000
	r12 0x004198a0 r13 0x7ffc9e708c80 r14 0x00000000 r15 0x00000000
	rip 0x0048762f
*vmdbg/lib/pharo/5.0-201911160620/pharo(markAndTrace+0x87f)[0x48762f]
vmdbg/lib/pharo/5.0-201911160620/pharo[0x41afa4]
vmdbg/lib/pharo/5.0-201911160620/pharo[0x41e0d8]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x12890)[0x7f90fa38c890]
vmdbg/lib/pharo/5.0-201911160620/pharo(markAndTrace+0x87f)[0x48762f]
vmdbg/lib/pharo/5.0-201911160620/pharo[0x481651]
vmdbg/lib/pharo/5.0-201911160620/pharo(fullGC+0xea)[0x4805fa]
vmdbg/lib/pharo/5.0-201911160620/pharo[0x4c9f65]
vmdbg/lib/pharo/5.0-201911160620/pharo[0x4add41]
vmdbg/lib/pharo/5.0-201911160620/pharo(interpret+0xa661)[0x42a6d1]
vmdbg/lib/pharo/5.0-201911160620/pharo[0x43e032]
vmdbg/lib/pharo/5.0-201911160620/pharo(interpret+0x140)[0x4201b0]
vmdbg/lib/pharo/5.0-201911160620/pharo(main+0x2d6)[0x41d8d6]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7)[0x7f90f9faab97]
vmdbg/lib/pharo/5.0-201911160620/pharo(_start+0x2a)[0x4198ca]
[0x0]
```

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