7 Days to Die server crashing on Ubuntu 20.04

[heusmich]

Hi @all,

From time to time my 7 Days to Die server (Alpha 20) on Ubuntu 20.04 crashes. In the logs I can find the following errors:

mmap(PROT_NONE) failed
Caught fatal signal - signo:6 code:-6 errno:0 addr:0x3eb001a8ea0
Obtained 17 stack frames.
#0 0x007f02e7bdb3c0 in (Unknown)
#1 0x007f02e7a1a18b in (Unknown)
#2 0x007f02e79f9859 in (Unknown)
#3 0x007f02e747cdf1 in (Unknown)
#4 0x007f02e747ce5e in (Unknown)
#5 0x007f02e747ffc4 in (Unknown)
#6 0x007f02e748022d in (Unknown)
#7 0x007f02e748131e in (Unknown)
#8 0x007f02e74841af in (Unknown)
#9 0x007f02e7484389 in (Unknown)
#10 0x007f02e74572ed in (Unknown)
#11 0x007f02e740c7ef in (Unknown)
#12 0x007f02e740c856 in (Unknown)
#13 0x00000041d7b41f in (wrapper managed-to-native) object:__icall_wrapper_ves_icall_array_new_specific (intptr,int)
#14 0x000000425b308c in Progression:Read (System.IO.BinaryReader,EntityAlive)
#15 0x007f02e6aafa43 in (wrapper dynamic-method) NetPackagePlayerStats:DMD<NetPackagePlayerStats::ProcessPackage> (NetPackagePlayerStats,World,GameManager)
#16 0x0000004254bc82 in ConnectionManager:ProcessPackages (INetConnection,NetPackageDirection,ClientInfo)
Aborted (core dumped)

Does anyone know why this happens and how I can solve this problem?

Best regards
heusmich

[SylenThunder]

Please take a look at the Pinned Troubleshooting thread for workarounds and fixes. If you still have an issue, then please read the Pinned thread on How to Report an Issue, and follow the instructions.

If you are on a20, be sure to wipe all data from previous versions and try a new map with a new seed you have not used previously.

[heusmich]

Originally posted by SylenThunder:

Please take a look at the Pinned Troubleshooting thread for workarounds and fixes. If you still have an issue, then please read the Pinned thread on How to Report an Issue, and follow the instructions.

If you are on a20, be sure to wipe all data from previous versions and try a new map with a new seed you have not used previously.

In the troubleshooting guides I can´t find a solution for this problem. I also already searched in the internet but couldn´t find a solution.

I setup the server from scratch, so there is no old data. And I´m using the map PREGEN8k that is available on the server by default, so there shouldn´t be a problem with the map.

[Element47]

Have this issue as well, regularly, whenever the last client disconnects.

Having peeked into the discord, the dedicated server seems currently pretty fubar'd. :/

[rosch]

Please take a look at:
https://forum.unity.com/threads/solved-il2cpp-android-mmap-prot_none-failed.1112581/#post-7520003

It's most likely because vm.max_map_count is set too low of a value (like 65K) and servers such as this (and Valheim) with large maps/entities make use of alot of virtual memory. You'll want to set it to some higher value like 512K.