'typeset -p' segfaults after failing to redefine a type variable in a namespace

[dnewhall]

If this code is run in 1.0.10:

namespace foo {
    typeset -T Foo_t=(
        typeset name=
    )
}

And then you do a typeset -p | head -1, everything works fine.

If the first code is run again, it outputs the usual message about not being able to redefine types.

However, then doing a typeset -p | head -1 will work, but also output "Memory fault(coredump)".

If it's run without the | head -1, it segfaults the entire shell.

If the typeset -T Foo_t=... is moved outside of the namespace, the opposite happens: the typeset -p | head -1 will work with the output "Memory fault(coredump)", but just typeset -p will work fine.

I also tested this in 1.0.0-beta.2 (since Ubuntu hasn't updated their version in apt yet...)

For the first case, the typeset -p | head -1 will take a long time but output nothing, and then crash when the | head -1 is removed. However, when the typeset -T Foo_t=... is moved outside of the namespace, no issues at all occur.

[Martijn Dekker]

Thanks for the report. I can reproduce this in 93u+ 2012-08-01 and ksh2020 as well.

Namespaces in general are a mess. They have many more bugs.