How to interpret error (Win32) 0x3e5 (997) - Overlapped I/O operation is in progress in windows dump?

I have a postmortem windows dump file I need to analyze. The process is stuck on .Net SqlDataReader reading values from SQL server over network. There are no deadlocks found using !dlk or !syncblk. I can see that it is making really slow progress internally and fetching rows. The list it is building is expanding. When I do !gle, I found this error.

0:009> !gle

LastErrorValue: (Win32) 0x3e5 (997) - Overlapped I/O operation is in progress.

LastStatusValue: (NTSTATUS) 0xc0000034 - Object Name not found.

Running !teb gives this output.

0:009> !teb

TEB at 000007ffffee4000

ExceptionList:        0000000000000000
StackBase:            000000001a800000
StackLimit:           000000001a7f9000
SubSystemTib:         0000000000000000
FiberData:            0000000000001e00
ArbitraryUserPointer: 0000000000000000
Self:                 000007ffffee4000
EnvironmentPointer:   0000000000000000
ClientId:             000000000000091c . 00000000000043bc
RpcHandle:            0000000000000000
Tls Storage:          000000001a8927e0
PEB Address:          000007fffffdc000
LastErrorValue:       997
LastStatusValue:      c0000034
Count Owned Locks:    0
HardErrorMode:        0

Could this be the root cause of this issue? Can someone throw some light regarding this Win32 error and how to resolve this?