when you're either exploring or loading a bad chunk (don't know what of both) the server suddenly stops doing anything, all the players get timedout (after a few seconds) and you can't write anything to console, but the weird thing is you can still see the server as online and also the backup-mod still did a backup after it "crashed". Also nothing is printed to the logs while the "crash" happend.
Mods:
appliedenergistics2-rv2-stable-10.jar
ArchitectureCraft-1.7.2-mc1.7.10.jar
Aroma1997Core-1.7.10-1.0.2.16.jar
Aroma1997s-Dimensional-World-1.7.10-1.1.0.1.jar
AromaBackup-1.7.10-0.1.0.0.jar
BiblioCraft[v1.11.7][MC1.7.10].jar
BigReactors-0.4.3A.jar
BloodMagic-1.7.10-1.3.3-17.jar
Botania r1.8-249.jar
BrandonsCore-1.0.0.12.jar
buildcraft-7.1.23.jar
Carpenter's Blocks v3.3.8.2 - MC 1.7.10.jar
Chisel-2.9.5.11.jar
CodeChickenCore-1.7.10-1.0.7.47-universal.jar
CoFHCore-[1.7.10]3.1.4-329.jar
ComputerCraft1.75.jar
cookingbook-mc1.7.10-1.0.140.jar
Decocraft-2.4.2_1.7.10.jar
Draconic-Evolution-1.7.10-1.0.2h.jar
Dynamic-Transport-Mod-1.7.10.jar
DynamicTrees-1.7.10-0.7.2c.jar
EnchantingPlus-1.7.10-3.0.2-d.jar
EnderCore-1.7.10-0.2.0.39_beta.jar
endercrop-1.7.10-1.2.jar
EnderIO-1.7.10-2.3.0.429_beta.jar
EnderIOAddons-1.7.10-2.3.0.427_beta-0.10.13.56_beta.jar
extrautilities-1.2.12.jar
FTBLib-1.7.10-1.0.18.3.jar
FTBUtilities-1.7.10-1.0.18.3.jar
GraveStone Mod 0.7.10.3.jar
ICBM-classic-1.7.10-2.16.2b205.jar
industrialcraft-2-2.2.827-experimental.jar
InfernalMobs-1.7.10.jar
InventoryTweaks-1.59-dev-152.jar
IronBackpacks-1.7.10-1.2.20.jar
ironchest-1.7.10-6.0.62.742-universal.jar
ironfurnaces-1.2.4R.jar
Jabba-1.2.2_1.7.10.jar
journeymap-1.7.10-5.1.4p2-unlimited.jar
malisiscore-1.7.10-0.14.3.jar
malisisdoors-1.7.10-1.13.2.jar
Mantle-1.7.10-0.3.2b.jar
MCA-1.7.10-5.2.2-universal.jar
Mekanism-1.7.10-9.1.1.1031.jar
MekanismGenerators-1.7.10-9.1.1.1031.jar
MekanismTools-1.7.10-9.1.1.1031.jar
meteors-1.7.10-2.14.3.jar
MineFactoryReloaded-[1.7.10]2.8.1-174.jar
Morpheus-1.7.10-1.6.21.jar
NotEnoughItems-1.7.10-1.0.5.120-universal.jar
OpenBlocks-1.7.10-1.6.jar
OpenModsLib-1.7.10-0.10.1.jar
OptiFine_1.7.10_HD_U_E7.jar
OreExcavation-1.1.71.jar
Pam's HarvestCraft 1.7.10Lb.jar
RadixCore-1.7.10-2.1.3-universal.jar
randomtweaks-1.12.2-2.8.2.0.jar
Realistic-Survival-Mod-1.7.10-Version-Creator.jar
SimplyJetpacks-MC1.7.10-1.5.3.jar
SlimevoidLibrary-2.0.4.7.jar
SolarFlux-1.7.10-0.8b.jar
TConstruct-1.7.10-1.8.8.jar
Thaumcraft-1.7.10-4.2.3.5.jar
ThermalDynamics-[1.7.10]1.2.1-172.jar
ThermalExpansion-[1.7.10]4.1.5-248.jar
ThermalFoundation-[1.7.10]1.2.6-118.jar
Translocator-1.7.10-1.1.2.16-universal.jar
Trapcraft-Mod-1.7.10.zip
twilightforest-1.7.10-2.3.8.jar
VoltzEngine-1.7.10-1.9.14b302.jar
Waila-1.5.10_1.7.10.jar
WailaHarvestability-mc1.7.10-1.1.6.jar
WAILAPlugins-MC1.7.10-0.2.0-25.jar
warpbook-1.7.10_2.0.37.jar
waterhooks-1.2.1.jar
weaponmod-1.14.3.jar
witchery-1.7.10-0.24.1.jar
1.7.10\Baubles-1.7.10-1.0.1.10.jar
1.7.10\CodeChickenLib-1.7.10-1.1.3.138-universal.jar
1.7.10\CodingLib-0.2.8b50.jar
1.7.10\ForgeMultipart-1.7.10-1.2.0.345-universal.jar
carpentersblocks\CarpentersBlocksCachedResources.zip
ic2\EJML-core-0.26.jar
The server had morph mod and random things but we removed that.