Memory leak in FileSystem.CACHE when submitting apps to secure cluster using InProcessLauncher

When submitting spark application in kerberos environment the credentials of 'current user' (UserGroupInformation.getCurrentUser()) are being modified.
Filesystem.CACHE entries contain 'current user' (with user credentials) as a key.
Submitting many spark applications using InProcessLauncher cause that FileSystem.CACHE becomes bigger and bigger.
Finally process exits because of OutOfMemory error.

Code for reproduction attached.

Output from running 'jmap -histo' on reproduction jvm shows that the number of FileSystem$Cache$Key increases in time:

time: #instances class
1671533274: 2 org.apache.hadoop.fs.FileSystem$Cache$Key
1671533335: 11 org.apache.hadoop.fs.FileSystem$Cache$Key
1671533395: 21 org.apache.hadoop.fs.FileSystem$Cache$Key
1671533455: 30 org.apache.hadoop.fs.FileSystem$Cache$Key
1671533515: 39 org.apache.hadoop.fs.FileSystem$Cache$Key
1671533576: 48 org.apache.hadoop.fs.FileSystem$Cache$Key
1671533636: 57 org.apache.hadoop.fs.FileSystem$Cache$Key
1671533696: 66 org.apache.hadoop.fs.FileSystem$Cache$Key
1671533757: 75 org.apache.hadoop.fs.FileSystem$Cache$Key
1671533817: 84 org.apache.hadoop.fs.FileSystem$Cache$Key
1671533877: 93 org.apache.hadoop.fs.FileSystem$Cache$Key
1671533937: 102 org.apache.hadoop.fs.FileSystem$Cache$Key
1671533998: 111 org.apache.hadoop.fs.FileSystem$Cache$Key
1671534058: 120 org.apache.hadoop.fs.FileSystem$Cache$Key
1671534118: 135 org.apache.hadoop.fs.FileSystem$Cache$Key
1671534178: 140 org.apache.hadoop.fs.FileSystem$Cache$Key
1671534239: 150 org.apache.hadoop.fs.FileSystem$Cache$Key
1671534299: 159 org.apache.hadoop.fs.FileSystem$Cache$Key
1671534359: 168 org.apache.hadoop.fs.FileSystem$Cache$Key
1671534419: 177 org.apache.hadoop.fs.FileSystem$Cache$Key
1671534480: 186 org.apache.hadoop.fs.FileSystem$Cache$Key
1671534540: 195 org.apache.hadoop.fs.FileSystem$Cache$Key
1671534600: 204 org.apache.hadoop.fs.FileSystem$Cache$Key
1671534661: 213 org.apache.hadoop.fs.FileSystem$Cache$Key
1671534721: 222 org.apache.hadoop.fs.FileSystem$Cache$Key
1671534781: 231 org.apache.hadoop.fs.FileSystem$Cache$Key
1671534841: 240 org.apache.hadoop.fs.FileSystem$Cache$Key
1671534902: 249 org.apache.hadoop.fs.FileSystem$Cache$Key
1671534962: 257 org.apache.hadoop.fs.FileSystem$Cache$Key
1671535022: 264 org.apache.hadoop.fs.FileSystem$Cache$Key
1671535083: 273 org.apache.hadoop.fs.FileSystem$Cache$Key
1671535143: 282 org.apache.hadoop.fs.FileSystem$Cache$Key
1671535203: 291 org.apache.hadoop.fs.FileSystem$Cache$Key