Check for crashes when killing processes

[maleadt]

When killing due to large output, it's possible the output is just:

GC error (probable corruption)
Allocations: 22893206 (Pool: 22892733; Big: 473); GC: 17
<?#0x7f1b5d124960::(nil)>

thread 0 ptr queue:
~~~~~~~~~~ ptr queue top ~~~~~~~~~~
Memory{Base.StackTraces.StackFrame}(1, 0x7f1b304fc020)[Base.StackTraces.StackFrame(func=#<null>, file=#<null>, line=0, linfo=#<null>, from_c=false, inlined=false, pointer=0x0000000000000000)]
==========
Base.Dict{Base.StackTraces.StackFrame, Profile.StackFrameTree{Base.StackTraces.StackFrame}}(slots=Memory{UInt8}(16, 0x7f1b356d5c40)[0x00, 0x00, 0x00, 0x00, 0x9e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00], keys=Memory{Base.StackTraces.StackFrame}(16, 0x7f1b32581340)[Base.StackTraces.StackFrame(func=#<null>, file=#<null>, line=0, linfo=#<null>, from_c=false, inlined=false, pointer=0x0000000000000000), Base.StackTraces.StackFrame(func=#<null>, file=#<null>, line=0, linfo=#<null>, from_c=false, inlined=false, pointer=0x0000000000000000), Base.StackTraces.StackFrame(func=#<null>, file=#<null>, line=0, linfo=#<null>, from_c=false, inlined=false, pointer=0x0000000000000000), Base.StackTraces.StackFrame(func=#<null>, file=#<null>, line=0, linfo=#<null>, from_c=false, inlined=false, pointer=0x0000000000000000), Base.StackTraces.StackFrame(func=:abstract_call_known, file=Symbol("./compiler/abstractinterpretation.jl"), line=2168, linfo=abstract_call_known(Core.Compiler.NativeInterpreter, Any, Core.Compiler.ArgInfo, Core.Compiler.StmtInfo, Core.Compiler.InferenceState, Int64) from abstract_call_known(Core.Compiler.AbstractInterpreter, Any, Core.Compiler.ArgInfo, Core.Compiler.StmtInfo, Union{Core.Compiler.IRInterpretationState, Core.Compiler.InferenceState}, Int64), from_c=false, inlined=false, pointer=0x00007f1b53bdff4f), Base.StackTraces.StackFrame(func=#<null>, file=#<null>, line=0, linfo=#<null>, from_c=false, inlined=false, pointer=0x0000000000000000), Base.StackTraces.StackFrame(func=#<null>, file=#<null>, line=0, linfo=#<null>, from_c=false, inlined=false, pointer=0x0000000000000000), Base.StackTraces.StackFrame(func=#<null>, file=#<null>, line=0, linfo=#<null>, from_c=false, inlined=false, pointer=0x0000000000000000), Base.StackTraces.StackFrame(func=#<null>, file=#<null>, line=0, linfo=#<null>, from_c=false, inlined=false, pointer=0x0000000000000000), Base.StackTraces.StackFrame(func=#<null>, file=#<null>, line=0, linfo=#<null>, from_c=false, inlined=false, pointer=0x0000000000000000), Base.StackTraces.StackFrame(func=#<null>, file=#<null>, line=0, linfo=#<null>, from_c=false, inlined=false, pointer=0x0000000000000000), Base.StackTraces.StackFrame(func=#<null>, file=#<null>, line=0, linfo=#<null>, from_c=false, inlined=false, pointer=0x0000000000000000), Base.StackTraces.StackFrame(func=#<null>, file=#<null>, line=0, linfo=#<null>, from_c=false, inlined=false, pointer=0x0000000000000000), Base.StackTraces.StackFrame(func=#<null>, file=#<null>, line=0, linfo=#<null>, from_c=false, inlined=false, pointer=0x0000000000000000), Base.StackTraces.StackFrame(func=#<null>, file=#<null>, line=0, linfo=#<null>, from_c=false, inlined=false, pointer=0x0000000000000000), Base.StackTraces.StackFrame(func=#<null>, file=#<null>, line=0, linfo=#<null>, from_c=false, inlined=false, pointer=0x0000000000000000)], vals=Memory{Profile.StackFrameTree{Base.StackTraces.StackFrame}}(16, 0x7f1b32584d40)[
...

i.e. we should have classified this as a GC corruption crash.

Similarly, it's possible that the process hangs after an internal error.

However, we need to take care that we don't introduce internal errors after interrupting the process...