[perl #126474] malloc deadlock in unsafe signal handler

On Wed Oct 28 03:44:27 2015, kazuhooku@gmail.com wrote:
> Unsafe signal handler calls malloc (via newSVsv), therefore causes
> deadlock when signal is received while malloc is running.
> 
> When I run the following script, and repeatedly send SIGUSR1 to the
> script (e.g. while 1 ; do kill -USR1 proc-id ; sleep 1; done), then
> the script enters a dead lock within the signal handler.

I don't think this is a bug - it's the reason safe signal handlers were introduced.

Tony

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via perlbug:  queue: perl5 status: new
https://rt.perl.org/Ticket/Display.html?id=126474

• [perl #126474] malloc deadlock in unsafe signal handler by Kazuho Oku
• Re: [perl #126474] malloc deadlock in unsafe signal handler by Kazuho Oku
• Re: [perl #126474] malloc deadlock in unsafe signal handler by Leon Timmermans
• Re: [perl #126474] malloc deadlock in unsafe signal handler by Kazuho Oku
• Re: [perl #126474] malloc deadlock in unsafe signal handler by Leon Timmermans
• [perl #126474] malloc deadlock in unsafe signal handler by Tony Cook via RT