Public bug reported:
Ubuntu 15.04 x86_64
xl2tpd-1.3.6+dfsg-2build1 compiled from Ubuntu-supplied sources with
adding OSFLAGS+= -DUSE_KERNEL to the Makefile
xl2pd daemon works very well and really uses kernel, so CPU usage is
very low on my 450 Mbits-limited ISP uplink using L2TP
however, once in a day, randomly, xl2tpd crashes like this
xl2tpd[2414]: segfault at 188 ip 000000000040c7f8 sp 00007fffb1345280 error 4
in xl2tpd[400000+1c000]
wih dead ppp0 interface present but not working, staying for 2-3 min, then
disappearing
looking into the code at the crash point reveals this in call.c line 416
---
#ifdef IP_ALLOCATION
if (c->addr)
unreserve_addr (c->addr);
if (c->lns->localrange) // <-- this is the crash location
unreserve_addr (c->lns->localaddr);
#endif
---
clearly c->lns is null pointer, so I patched this source a little:
---
if (c->lns && c->lns->localrange)
unreserve_addr (c->lns->localaddr);
---
compiled, installed and 1 week no crashes, no memory leaks and stable
L2TP tunnel
this code introduced in patch 0003-Add-local-ip-range-option.patch and
seems xl2tpd-1.3.6+dfsg-3 have same issue, the code of call.c is the
same
seems problem exists in debian too
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=760602
please consider a quick fix. thanks.
** Affects: xl2tpd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1509183
Title:
xl2tpd-1.3.6+dfsg-2build1 periodically crashes if compiled with
USE_KERNEL
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