#15010: Application (warp) server crashing periodically with "TSO object entered" -------------------------------------+------------------------------------- Reporter: ramirez7 | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.4.3 Component: Runtime | Version: 8.0.2 System | Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Runtime crash Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- We are seeing one of our warp servers periodically crash with the following error: {{{ Apr 06 10:44:28 stdouterr.log: binary-name-elided: internal error: TSO object entered! Apr 06 10:44:28 stdouterr.log: (GHC version 8.0.2 for x86_64_unknown_linux) }}} We are sometimes seeing CPU/memory spikes concurrently with this error, but not always. We are running very similar servers for other applications and they are '''not''' experiencing this error. But this server is one of our highest- load ones. Other tickets I found with this error: * https://ghc.haskell.org/trac/ghc/ticket/12383 * https://ghc.haskell.org/trac/ghc/ticket/8316 But these seem to be happening in ghci and ghc itself, not in a binary compiled by ghc. Questions I have: * What exactly is this error? * Is there anything else we can do on our side to help debug? Any artifacts that should be produced upon crash? * Should we consider upgrading our GHC version from 8.0.2 to get a bugfix? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15010 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler