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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <150808213755.ZM18793@torch.brasslantern.com>
Date: Sat, 8 Aug 2015 21:37:55 -0700
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To: zsh-workers@zsh.org
Subject: Crash if zsh exits with zftp module loaded
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This only reproduces with a debugging malloc library that detects the
double free:

#3  0x00007ffff6d00b26 in malloc_printerr (action=3, 
    str=0x7ffff6e007c8 "double free or corruption (fasttop)", 
    ptr=<optimized out>) at malloc.c:5051
#4  0x0000000000476a8f in zfree (p=0x7dfe80, sz=8) at mem.c:1820
#5  0x00000000004dfa86 in zftp_cleanup () at zftp.c:3154
#6  0x00000000004dfa9d in zftpexithook (d=0x7903c0, dummy=0x0) at zftp.c:3160
#7  0x00000000004780f4 in runhookdef (h=0x7903c0, d=0x0) at module.c:990
#8  0x0000000000431270 in zexit (val=0, from_where=0) at builtin.c:5229
#9  0x0000000000460077 in zsh_main (argc=2, argv=0x7fffffffe668) at init.c:1693
#10 0x000000000041b834 in main (argc=2, argv=0x7fffffffe668) at ./main.c:93