[Linux] Assertion Failed: SDR service thread gave up on lock after waiting 248ms

Looking at my Player.log to help debug a mod crash issue, I found that if I managed to actually get into a save, I get a lot of lines of 

src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp (1836) : Assertion Failed: SDR service thread gave up on lock after waiting 248ms.  This directly adds to delay of processing of network packets!

This is what happens when I load into the save, then Quit:
 

Game.OnApplicationQuit()
Setting up 1 worker threads for Enlighten.
  Thread -> id: 7f8c2d7fe700 -> priority: 1 
src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp (365) : Assertion Failed: /data/src/steamnetworkingsockets/clientlib/steamnetworkingsockets_connections.cpp(387): Lock 'table' not held
src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp (365) : Assertion Failed: /data/src/steamnetworkingsockets/clientlib/steamnetworkingsockets_connections.cpp(387): Lock 'table' not held
src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp (1836) : Assertion Failed: SDR service thread gave up on lock after waiting 150ms.  This directly adds to delay of processing of network packets!
[line #952 to line #8481 deleted for brevity]
src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp (1836) : .  This directly adds to delay of processing of network packets!
assert_20210720101544_2.dmp[24738]: Uploading dump (out-of-process)
/tmp/dumps/assert_20210720101544_2.dmp
src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp (1836) : Assertion Failed: SDR service thread gave up on lock after waiting 248ms.  This directly adds to delay of processing of network packets!
src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp (1836) : Assertion Failed: SDR service thread gave up on lock after waiting 248ms.  This directly adds to delay of processing of network packets!
src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp (1836) : Assertion Failed: SDR service thread gave up on lock after waiting 248ms.  This directly adds to delay of processing of network packets!
src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp (1836) : Assertion Failed: SDR service thread gave up on lock after waiting 248ms.  This directly adds to delay of processing of network packets!
src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp (1836) : Assertion Failed: SDR service thread gave up on lock after waiting 248ms.  This directly adds to delay of processing of network packets!
src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp (1836) : Assertion Failed: SDR service thread gave up on lock after waiting 248ms.  This directly adds to delay of processing of network packets!
src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp (1836) : Assertion Failed: SDR service thread gave up on lock after waiting 248ms.  This directly adds to delay of processing of network packets!
src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp (1836) : Assertion Failed: SDR service thread gave up on lock after waiting 248ms.  This directly adds to delay of processing of network packets!
src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp (1836) : Assertion Failed: SDR service thread gave up on lock after waiting 248ms.  This directly adds to delay of processing of network packets!
src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp (1836) : Assertion Failed: SDR service thread gave up on lock after waiting 249ms.  This directly adds to delay of processing of network packets!
src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp (1836) : Assertion Failed: SDR service thread gave up on lock after waiting 249ms.  This directly adds to delay of processing of network packets!
src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp (1836) : Assertion Failed: SDR service thread gave up on lock after waiting 249ms.  This directly adds to delay of processing of network packets!
src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp (1836) : Assertion Failed: SDR service thread gave up on lock after waiting 249ms.  This directly adds to delay of processing of network packets!
[00:15:45.183] [1] [INFO] [PLib/EfficientFetch] Destroying EfficientFetch
[00:15:45.188] [1] [INFO] [PLib/FallingSand] Stopped tracking 0 diggables, 0 queued digs
[00:15:45.188] [1] [INFO] [PLib/SweepByType] Destroying FilteredClearTool
[00:15:45.189] [1] [INFO] [PLib/ThermalTooltips] Destroying ExtendedThermalTooltip
assert_20210720101544_2.dmp[24738]: Finished uploading minidump (out-of-process): success = yes
assert_20210720101544_2.dmp[24738]: response: Discarded=1
assert_20210720101544_2.dmp[24738]: file ''/tmp/dumps/assert_20210720101544_2.dmp'', upload yes: ''Discarded=1''
pid 24738 != 24737, skipping destruction (fork without exec?)

It appears to be uploading these dumps very regularly.