Here it is (I modified CCOPTS in the Makefile to replace -O2 by -g to get line
numbers):
#0 0xb7f8eb45 in fgets () from /lib/tls/i686/cmov/libc.so.6
#1 0x0804c6ff in generic_record_read (fp=0x0,
worker=0x804dc35 <dgram_show_line>, f=0x805af50, fam=10) at ss.c:1233
#2 0x0804e216 in udp_show (f=0x805af50) at ss.c:1786
#3 0x08050d59 in main (argc=0, argv=0xbf9ccecc) at ss.c:2774
I think the problem is in the pointer comparison at ss.c:1785:
if ((f->families&(1<<AF_INET6)) &&
(fp = net_udp6_open()) >= 0) {
I changed this to
if ((f->families&(1<<AF_INET6)) &&
(fp = net_udp6_open()) != NULL) {
and the problem went away. There is similar bug in ss.c:1777, too:
if (f->families&(1<<AF_INET)) {
if ((fp = net_udp_open()) < 0)
Indeed trying PROC_NET_UDP=/foo/bar ./misc/ss -un segfaulted. Changing above to:
if (f->families&(1<<AF_INET)) {
if ((fp = net_udp_open()) == NULL)
fixed also that problem.
--
iproute: ss -u segfaults if ipv6 module is not loaded
https://bugs.launchpad.net/bugs/225573
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