Description:
rsyslog 7.2.3-1 produces segmentation fault when loading imuxsock module in libee.
Verified on three different nodes, different architectures.

Solution:
Downgrade libee to version 0.3.1-3.

Additional info:
* package version(s)
$ pacman -Qi rsyslog | grep '^Version'
Version : 7.2.3-1

$ pacman -Qi libee | grep '^Version'
Version : 0.4.0-1


* config and/or log files etc.
$ grep imuxsock /etc/rsyslog.conf
$ModLoad imuxsock # provides support for local system logging (e.g. via logger command)



Steps to reproduce:
- Update rsyslog to 7.2.3-1
- Update libee to 0.4.0-1
- Activate imuxsock in rsyslog configuration


Strace:
open("/usr/lib/rsyslog/imuxsock.so", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\f\1\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=378976, ...}) = 0
mmap(NULL, 2480728, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f708465b000
mprotect(0x7f70846b1000, 2093056, PROT_NONE) = 0
mmap(0x7f70848b0000, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x55000) = 0x7f70848b0000
mmap(0x7f70848b8000, 2648, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f70848b8000
close(3) = 0
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=118901, ...}) = 0
mmap(NULL, 118901, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f70860bb000
close(3) = 0
open("/usr/lib/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0V\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1022344, ...}) = 0
mmap(NULL, 3117368, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f7084361000
mprotect(0x7f708445a000, 2093056, PROT_NONE) = 0
mmap(0x7f7084659000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xf8000) = 0x7f7084659000
close(3) = 0
open("/usr/lib/libee.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\240+\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=47560, ...}) = 0
mmap(NULL, 2142792, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f7084155000
mprotect(0x7f7084160000, 2093056, PROT_NONE) = 0
mmap(0x7f708435f000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xa000) = 0x7f708435f000
close(3) = 0
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x54c6} ---
+++ killed by SIGSEGV +++
[1] 26259 segmentation fault strace rsyslogd


Backtrace:
#0 0x00000000000054c6 in ?? ()
#1 0x00007ffff628f1f5 in floor () from /usr/lib/libm.so.6
#2 0x00007ffff7de72d6 in _dl_relocate_object () from /lib/ld-linux-x86-64.so.2
#3 0x00007ffff7dedaba in dl_open_worker () from /lib/ld-linux-x86-64.so.2
#4 0x00007ffff7de9636 in _dl_catch_error () from /lib/ld-linux-x86-64.so.2
#5 0x00007ffff7ded26c in _dl_open () from /lib/ld-linux-x86-64.so.2
#6 0x00007ffff77a6026 in ?? () from /usr/lib/libdl.so.2
#7 0x00007ffff7de9636 in _dl_catch_error () from /lib/ld-linux-x86-64.so.2
#8 0x00007ffff77a65fc in ?? () from /usr/lib/libdl.so.2
#9 0x00007ffff77a60c1 in dlopen () from /usr/lib/libdl.so.2
#10 0x00000000004418ef in Load (pModName=0x7fffffffd6a0 "imuxsock", bConfLoad=1 '\001', lst=0x0) at modules.c:1141
#11 0x000000000042a0f6 in doModLoad (pp=0x7fffffffd948, pVal=0x0) at conf.c:125
#12 0x0000000000451418 in doCustomHdlr (pp=0x7fffffffd948, pSetHdlr=0x42a020 <doModLoad>, pVal=0x0) at cfsysline.c:101
#13 0x00000000004524e6 in cslchCallHdlr (pThis=0x697180, ppConfLine=0x7fffffffd948) at cfsysline.c:756
#14 0x00000000004529d2 in processCfSysLineCommand (pCmdName=0x7fffffffd9a0 "ModLoad", p=0x7fffffffd998) at cfsysline.c:989
#15 0x000000000042a2a4 in cfsysline (p=0x6a32d9 "imuxsock # provides support for local system logging (e.g. via logger command)")
at conf.c:215
#16 0x000000000042c3fa in cnfDoCfsysline (
ln=0x6a32d0 "$ModLoad imuxsock # provides support for local system logging (e.g. via logger command)") at rsconf.c:444
#17 0x000000000041e431 in yylex () at lexer.l:228
#18 0x000000000041b261 in yyparse () at grammar.c:1505
#19 0x000000000042e7fc in load (cnf=0x68e148 <ourConf>, confFile=0x462748 "/etc/rsyslog.conf") at rsconf.c:1278
#20 0x000000000040f7e2 in realMain (argc=2, argv=0x7fffffffe4c8) at syslogd.c:2034
#21 0x000000000040fa0e in main (argc=2, argv=0x7fffffffe4c8) at syslogd.c:2124