Mono 3.10.0 is very old, I recommend upgrading before investigating
more. You never know if you might be chasing a bug that is fixed already.
On Friday, June 23, 2017 02:16 AM, Sotirios Delimanolis via
Mono-devel-list wrote:
Running Mono 3.10.0
Mono JIT compiler version 3.10.0 (tarball Fri Oct 10 17:29:39 UTC 2014)
We're seeing an unhandled exception that crashes our program in
MemoryCache's scheduled cleanup . This is the stack trace dumped before exit
2017-06-22 03:14:28.478510 GMT Unhandled Exception:
2017-06-22 03:14:28.478511 GMT System.NullReferenceException: Object
reference not set to an instance of an object
2017-06-22 03:14:28.478512 GMT at
System.Collections.Generic.RBTree.find_key[String] (System.String key,
System.Collections.Generic.List`1 path) [0x00000] in <filename unknown>:0
2017-06-22 03:14:28.478514 GMT at
System.Collections.Generic.RBTree.Remove[String] (System.String key)
[0x00000] in <filename unknown>:0
2017-06-22 03:14:28.478551 GMT at
System.Collections.Generic.SortedDictionary`2[System.String,System.Runtime.Caching.MemoryCacheEntry].Remove
(System.String key) [0x00000] in <filename unknown>:0
2017-06-22 03:14:28.478553 GMT at
System.Runtime.Caching.MemoryCacheContainer.DoRemoveEntry
(System.Runtime.Caching.MemoryCacheEntry entry, Boolean updateLRU,
System.String key, CacheEntryRemovedReason reason) [0x00000] in
<filename unknown>:0
2017-06-22 03:14:28.478557 GMT at
System.Runtime.Caching.MemoryCacheContainer.DoRemoveExpiredItems
(Boolean needLock) [0x00000] in <filename unknown>:0
2017-06-22 03:14:28.478559 GMT at
System.Runtime.Caching.MemoryCacheContainer.RemoveExpiredItems
(System.Object state) [0x00000] in <filename unknown>:0
2017-06-22 03:14:28.478562 GMT at
System.Threading.Timer+Scheduler.TimerCB (System.Object o) [0x00000] in
<filename unknown>:0
Looking at the find_keyimplementation here
<https://github.com/mono/mono/blob/mono-3.10.0-branch/mcs/class/System/System.Collections.Generic/RBTree.cs#L306-L335>,
I don't see anything that can be null that could cause a
NullReferenceException.
What is going on?
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