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[users@httpd] Apache crashes with: AH03104: apr_thread_create


Apache has been randomly crashing (for a few months now) and I cannot seem
to understand why. I cannot replicate the crash even when hitting the server
with 4,000 requests @ a concurrency of 500. This is a production server and
I am willing to compensate someone for their efforts resolving this. Below
is a sample of one, of the many, error messages:

[Fri Sep 21 11:27:24 2018] [mpm_event:alert] (11)Resource temporarily
unavailable: AH03104: apr_thread_create: unable to create worker thread

Below is more information that might be useful:

>cat /etc/SuSE-release
SUSE Linux Enterprise Server 12 (x86_64)
# This file is deprecated and will be removed in a future service pack or
# Please check /etc/os-release for details about this release.
>cat /etc/os-release
PRETTY_NAME="SUSE Linux Enterprise Server 12 SP2"
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                12
On-line CPU(s) list:   0-11
Thread(s) per core:    2
Core(s) per socket:    6
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 63
Model name:            Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz
Stepping:              2
CPU MHz:               1200.199
CPU max MHz:           3200.0000
CPU min MHz:           1200.0000
BogoMIPS:              4794.82
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              15360K
NUMA node0 CPU(s):     0-11
Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall
nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl
xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor
ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2
x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm
ida arat epb pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase
tsc_adjust bmi1 avx2 smep bmi2 erms invpcid cqm xsaveopt cqm_llc
>free -m
             total       used       free     shared    buffers     cached
Mem:          7547       2691       4856        365          6       1965
-/+ buffers/cache:        719       6828
Swap:         2062          0       2062

Apache information
Server Version: Apache/2.4.34 (Unix) OpenSSL/1.0.2l
Server MPM: event
**All MPM event settings are default.**
Should I enable some type of core dump settings? I do have the scoreboard
enabled (mod_status) and if it helps at all, this is where the error is
being triggered:

Thank you so much in advance!

Jerry Martinez

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