Re: another deadlock in free() called from a signal handler

[Bart Schaefer <schaefer@brasslantern.com>]

On May 13,  6:37pm, Kamil Dudka wrote:
}
} Wouldn't it be safer to wrap [z]free() internally by the signal
} queuing macros?

Sigh.  I'm somewhat resistant to that because if the problem exists with
free() then it probably also exists with other operations at the calling
scope and the farther down we put defensive programming the less likely
we are to get a reproducible bug report for the higher-level problem.

} A backtrace of the deadlock (captured with zsh-4.3.11-3.el6) follows:
} 
} #10 0x000000000044a339 in lexrestore () at lex.c:342

The entire lexrestore() function is gone now, and its replacement has
already got the signal queuing wrapped around it.  So I think the problem
you're reporting here was already fixed:

commit 8727049674b1f39a8926c02dc74e9f19bbd70289
Author: Barton E. Schaefer <schaefer@zsh.org>
Date:   Tue Sep 30 20:34:58 2014 -0700

    33298: make lexrestore() more signal-safe