Nagios 4.4.3 - signal 11, Segmentation fault?

[LouieBrown]

I have two crashes of Nagios core 4.4.3. Nagios was running since June with no issues. Running on CentOS 7, Linux SRV-97D8 3.10.0-1127.19.1.el7.x86_64. The core file shows a problem in add_macrox_environment_vars_r

The first kernel log shows the following. The crash occurred on October 7.

[4198897.547280] traps: nagios[30743] general protection ip:7f745c3cc665 sp:7ffda29dbba8 error:0 in libc-2.17.so[7f745c25d000+1c3000]

The back trace shows the following:

Core was generated by `/usr/sbin/nagios -d /etc/nagios/nagios.cfg'.
Program terminated with signal 11, Segmentation fault.
#0 __strlen_sse2_pminub () at ../sysdeps/x86_64/multiarch/strlen-sse2-pminub.S:49
49 pcmpeqb (%rax), %xmm0
(gdb) bt
#0 __strlen_sse2_pminub () at ../sysdeps/x86_64/multiarch/strlen-sse2-pminub.S:49
#1 0x000055b4df976d9a in kvvec_addkv_wlen (kvv=kvv@entry=0x55b4e6072150, key=0x55b4e2c9b310 "NAGIOS_TEMPFILE", keylen=keylen@entry=0,
value=0x72756f686b726f77 <Address 0x72756f686b726f77 out of bounds>, valuelen=valuelen@entry=0) at kvvec.c:97
#2 0x000055b4df93cbb0 in add_macrox_environment_vars_r (kvvp=0x55b4e6072150, mac=0x7ffda29dbd80) at ../common/macros.c:3372
#3 macros_to_kvv (mac=mac@entry=0x7ffda29dbd80) at ../common/macros.c:3317
#4 0x000055b4df9168bd in wproc_run_job (job=0x55b4e3eb8600, mac=mac@entry=0x7ffda29dbd80) at workers.c:1167
#5 0x000055b4df91850e in wproc_run_check (cr=cr@entry=0x55b4e7249c90, cmd=<optimized out>, mac=mac@entry=0x7ffda29dbd80) at workers.c:1284
#6 0x000055b4df919c20 in run_async_service_check (svc=svc@entry=0x55b4e0f8dd70, check_options=check_options@entry=0, latency=latency@entry=8.4999999671708792e-05,
scheduled_check=scheduled_check@entry=1, reschedule_check=reschedule_check@entry=1, time_is_valid=time_is_valid@entry=0x7ffda29dc47c,
preferred_time=preferred_time@entry=0x7ffda29dc488) at checks.c:318
#7 0x000055b4df91a0a1 in run_scheduled_service_check (svc=svc@entry=0x55b4e0f8dd70, check_options=0, latency=latency@entry=8.4999999671708792e-05) at checks.c:92
#8 0x000055b4df93210b in handle_timed_event (event=event@entry=0x55b4e48167a0) at events.c:1226
#9 0x000055b4df932c53 in event_execution_loop () at events.c:1165
#10 0x000055b4df910b1d in main (argc=<optimized out>, argv=<optimized out>) at nagios.c:846


Second crash occurred on November 9 and the kernel log shows

2020-11-09T23:40:07.271337+00:00 SRV-97D8 systemd[1]: nagios.service: main process exited, code=dumped, status=11/SEGV
2020-11-09T23:40:07.321622+00:00 SRV-97D8 kill[17824]: kill: cannot find process ""
2020-11-09T23:40:07.324440+00:00 SRV-97D8 systemd[1]: nagios.service: control process exited, code=exited status=1

The back trace shows the following:

Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `/usr/sbin/nagios -d /etc/nagios/nagios.cfg'.
Program terminated with signal 11, Segmentation fault.
#0 ___fprintf_chk (fp=fp@entry=0x3035363934303631, flag=flag@entry=1, format=format@entry=0x561a5437f890 "[%lu.%06lu] [%03d.%d] [pid=%lu] ") at fprintf_chk.c:31
31 _IO_acquire_lock_clear_flags2 (fp);
(gdb) bt
#0 ___fprintf_chk (fp=fp@entry=0x3035363934303631, flag=flag@entry=1, format=format@entry=0x561a5437f890 "[%lu.%06lu] [%03d.%d] [pid=%lu] ") at fprintf_chk.c:31
#1 0x0000561a54328623 in fprintf (__fmt=0x561a5437f890 "[%lu.%06lu] [%03d.%d] [pid=%lu] ", __stream=0x3035363934303631) at /usr/include/bits/stdio2.h:97
#2 log_debug_info (level=level@entry=1, verbosity=verbosity@entry=0, fmt=fmt@entry=0x561a5437f9aa "process_macros_r()\n") at logging.c:536
#3 0x0000561a5432b0a8 in process_macros_r (mac=mac@entry=0x7ffe1df95ec0, input_buffer=0x0, output_buffer=0x7ffe1df95c20, options=4) at ../common/macros.c:116
#4 0x0000561a543296e0 in grab_standard_host_macro_r (mac=mac@entry=0x7ffe1df95ec0, macro_type=macro_type@entry=74, temp_host=<optimized out>, output=output@entry=0x7ffe1df96110,
free_macro=0x7ffe1df95d4c) at ../common/macros.c:1884
#5 0x0000561a5432a49e in grab_macrox_value_r (mac=mac@entry=0x7ffe1df95ec0, macro_type=macro_type@entry=74, arg1=arg1@entry=0x0, arg2=arg2@entry=0x0, output=output@entry=0x7ffe1df96110,
free_macro=free_macro@entry=0x7ffe1df95d4c) at ../common/macros.c:778
#6 0x0000561a5432fc53 in add_macrox_environment_vars_r (kvvp=0x561a55f9e3e0, mac=0x7ffe1df95ec0) at ../common/macros.c:3362
#7 macros_to_kvv (mac=mac@entry=0x7ffe1df95ec0) at ../common/macros.c:3317
#8 0x0000561a543098bd in wproc_run_job (job=0x561a55f85fa0, mac=mac@entry=0x7ffe1df95ec0) at workers.c:1167
#9 0x0000561a5430b50e in wproc_run_check (cr=cr@entry=0x561a55f99f80, cmd=<optimized out>, mac=mac@entry=0x7ffe1df95ec0) at workers.c:1284
#10 0x0000561a5430cc20 in run_async_service_check (svc=svc@entry=0x561a565a75d0, check_options=check_options@entry=0, latency=latency@entry=0, scheduled_check=scheduled_check@entry=1,
reschedule_check=reschedule_check@entry=1, time_is_valid=time_is_valid@entry=0x7ffe1df965bc, preferred_time=preferred_time@entry=0x7ffe1df965c8) at checks.c:318
#11 0x0000561a5430d0a1 in run_scheduled_service_check (svc=svc@entry=0x561a565a75d0, check_options=0, latency=latency@entry=0) at checks.c:92
#12 0x0000561a5432510b in handle_timed_event (event=event@entry=0x561a55f48590) at events.c:1226
#13 0x0000561a54325c53 in event_execution_loop () at events.c:1165
#14 0x0000561a54303b1d in main (argc=<optimized out>, argv=<optimized out>) at nagios.c:846