maintainer-feedback requested: [Bug 249323] ports-mgmt/pkg audit -F Segmentation fault - 1.15.1, regression

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<pkg at FreeBSD.org> for maintainer-feedback:
Bug 249323: ports-mgmt/pkg audit -F Segmentation fault - 1.15.1, regression
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249323



--- Description ---
pkg 1.15.1 crashes reliably during "pkg audit -F":

$ pkg audit -F
Fetching vuln.xml.bz2:	 0%Child process pid=53558 terminated abnormally:
Segmentation fault

Here's a stack trace from GDB:
(gdb) bt
#0  0x0000000800cc1e4e in fread_unlocked () from /lib/libc.so.7
#1  0x0000000800cc1db3 in fread () from /lib/libc.so.7
#2  0x00000000005002bc in pkg_fetch_file_to_fd (repo=0x0, 
    url=0x800fba0f0 "http://vuxml.freebsd.org/freebsd/vuln.xml.bz2", dest=5,
t=0x7fffffffd798, 
    offset=0, size=-1, silent=false) at fetch.c:302
#3  0x00000000004ffa82 in pkg_fetch_file_tmp (repo=0x0, 
    url=0x800fba0f0 "http://vuxml.freebsd.org/freebsd/vuln.xml.bz2", 
    dest=0x7fffffffd920 "/tmp/vuln.xml.bz2.N5kBf2cN", t=0) at fetch.c:112
#4  0x000000000047bfa2 in pkg_audit_fetch (
    src=0x800fba0f0 "http://vuxml.freebsd.org/freebsd/vuln.xml.bz2", dest=0x0)
    at pkg_audit.c:276
#5  0x00000000002adc00 in exec_audit (argc=0, argv=0x7fffffffe5b0) at
audit.c:164
#6  0x00000000002bbde9 in main (argc=2, argv=0x7fffffffe5a0) at main.c:886