LevelDB IO error

[amadin]

#0 virtual void* EmergeThread::Thread()
(Leftover data: #1 MapBlock* ServerMap::loadBlock(v3s16))
(Leftover data: #2 void ServerMap::loadBlock(std::string*, v3s16, MapSector*, bool))
(Leftover data: #3 void ItemStack::deSerialize(std::istream&, IItemDefManager*))
DEBUG STACK FOR THREAD 7fb5a9ff7700:
#0 virtual void* CurlFetchThread::Thread()
DEBUG STACK FOR THREAD 7fb5aa9f8700:
#0 virtual void* ServerThread::Thread()
#1 void Server::Receive()
(Leftover data: #2 void Server::SendBlocks(float))
(Leftover data: #3 void RemoteClient::GetNextBlocks(ServerEnvironment*, EmergeManager*, float, std::vector<PrioritySortedBlockTransfe
r>&))
(Leftover data: #4 void ItemStack::serialize(std::ostream&) const)
(Leftover data: #5 bool getCraftingResult(Inventory*, ItemStack&, std::vector<ItemStack>&, bool, IGameDef*))
(Leftover data: #6 void ItemStack::deSerialize(std::istream&, IItemDefManager*))
DEBUG STACK FOR THREAD 7fb5b63eb780:
#0 int main(int, char**)
#1 Dedicated server branch
#2 void dedicated_server_loop(Server&, bool&)
#3 void Server::step(float)
(Leftover data: #4 void Server::SendAccessDenied_Legacy(irr::u16, const wstring&))
Automatically selecting world at [/home/user/minetest/bin/../worlds/world]
2015-12-12 03:39:28: ERROR[main]: The following mods could not be found: "mapit" "rivergen" "wield3d"
2015-12-12 03:39:28: ERROR[main]: ERROR: An unhandled exception occurred: LevelDB error: IO error: lock /home/user/minetest/bin/../wor
lds/world/map.db/LOCK: Resource temporarily unavailable
Automatically selecting world at [/home/user/minetest/bin/../worlds/world]
2015-12-18 04:09:13: ERROR[main]: The following mods could not be found: "wield3d"
2015-12-18 04:09:13: ERROR[main]: ERROR: An unhandled exception occurred: LevelDB error: IO error: lock /home/user/minetest/bin/../wor
lds/world/map.db/LOCK: Resource temporarily unavailable

0.4.13, 4gb RAM.

[trev]

Hey. I don't know much about LevelDB(I use SQLite for my worlds). However, I wanted to suggest that you restart your computer. I know that sounds totally generic, but it might work. I believe that problem is that a lock file is indicating that the LevelDB file is in use by another process. If that is the case, restarting the computer might kill the defunct process. Or, if more than one instance of Minetest is running, try exiting them all and starting over. Just a first glance thought, I hope it makes some logical sense :/. Good luck :)

[trev]

Oh, and another thing. It appears that some mods are missing, although I think that the lock is a separate issue. Make sure that mapit, rivergen, and wield3d are installed and accessible.