Unmounting volumes after starting YAMCS

[lorenzo-gomez-windhover]

	java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:92)
	java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
	java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:116)
	java.base/sun.nio.fs.UnixFileStore.readAttributes(UnixFileStore.java:115)
	java.base/sun.nio.fs.UnixFileStore.getTotalSpace(UnixFileStore.java:122)
	org.yamcs.parameter.FileStoreParameterProducer.getSystemParameters(FileStoreParameterProducer.java:96)
	org.yamcs.parameter.SystemParametersService.run(SystemParametersService.java:174)
	java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
	java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
	java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	java.base/java.lang.Thread.run(Thread.java:829)

When unmounting a volume after starting YAMCS, it will spam the console with the above exception. My concern is if this puts this system in some unstable state.

I suspect this might be related to some of the issue we've seen in #4 and #5. I think...this needs to be investigated further.

[lorenzo-gomez-windhover]

Speaking of unstable state:

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x0000000000000030, pid=32260, tid=53801
#
# JRE version: OpenJDK Runtime Environment (11.0.18+10) (build 11.0.18+10-post-Ubuntu-0ubuntu120.04.1)
# Java VM: OpenJDK 64-Bit Server VM (11.0.18+10-post-Ubuntu-0ubuntu120.04.1, mixed mode, sharing, tiered, compressed oops, g1 gc, linux-amd64)
# Problematic frame:
# C  0x0000000000000030
#
# Core dump will be written. Default location: Core dumps may be processed with "/usr/share/apport/apport -p%p -s%s -c%c -d%d -P%P -u%u -g%g -- %E" (or dumping to /home/lgomez/projects/integration/squeaky-weasel/software/airliner/build/fixedwing/gemini2/commander_workspace/core.32260)
#
# An error report file with more information is saved as:
# /home/lgomez/projects/integration/squeaky-weasel/software/airliner/build/fixedwing/gemini2/commander_workspace/hs_err_pid32260.log
12:51:51.282 _global [18] YamcsServer Yamcs stopped in 46ms
[thread 41005 also had an error]
Compiled method (nm) 8612039 8611     n 0       org.rocksdb.RocksDB::iterator (native)
 total in heap  [0x00007fe590bd0790,0x00007fe590bd0b30] = 928
 relocation     [0x00007fe590bd0908,0x00007fe590bd0938] = 48
 main code      [0x00007fe590bd0940,0x00007fe590bd0b28] = 488
 oops           [0x00007fe590bd0b28,0x00007fe590bd0b30] = 8
Compiled method (c1) 8612039 8610       3       org.rocksdb.RocksDB::newIterator (21 bytes)
 total in heap  [0x00007fe589f67090,0x00007fe589f67bb8] = 2856
 relocation     [0x00007fe589f67208,0x00007fe589f67298] = 144
 main code      [0x00007fe589f672a0,0x00007fe589f67900] = 1632
 stub code      [0x00007fe589f67900,0x00007fe589f67940] = 64
 oops           [0x00007fe589f67940,0x00007fe589f67948] = 8
 metadata       [0x00007fe589f67948,0x00007fe589f67990] = 72
 scopes data    [0x00007fe589f67990,0x00007fe589f67aa0] = 272
 scopes pcs     [0x00007fe589f67aa0,0x00007fe589f67ba0] = 256
 dependencies   [0x00007fe589f67ba0,0x00007fe589f67ba8] = 8
 nul chk table  [0x00007fe589f67ba8,0x00007fe589f67bb8] = 16
#
# If you would like to submit a bug report, please visit:
#   https://bugs.launchpad.net/ubuntu/+source/openjdk-lts
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#

When I killed this instance, I got a segfault.