Re: [BUG] Crash due to malloc call in signal handler

[Peter Stephenson <p.stephenson@xxxxxxxxxxx>]

On Fri, 2019-12-13 at 10:45 +0100, Roman Perepelitsa wrote:
> On Fri, Dec 13, 2019 at 10:40 AM Peter Stephenson
> <p.stephenson@xxxxxxxxxxx> wrote:
> > 
> > The main shell is suspended, waiting for a child to finish, so the fact
> > it's in the signal handler isn't saying anything.
> > 
> > From the look of it, some memory corruption must already have occurred
> > at this point to get the malloc to fail.
> malloc is not async signal safe. It's illegal to call it from a signal
> handler. I'm not saying this is what's causing a crash.

In zsh, this is handled by queuing interrupts and only allowing them to
run in a few places in the code.  Obviously, waiting for a child to
exit is one of those places.

pws