#15716: GHC hangs on default implementation of type family -------------------------------------+------------------------------------- Reporter: Heimdell | Owner: (none) Type: bug | Status: new Priority: high | Milestone: Component: Compiler | Version: 8.4.1 Resolution: | Keywords: Operating System: Linux | Architecture: x86_64 Type of failure: Compile-time | (amd64) crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Heimdell): It seems to consume neither any memory during the hang, nor processor time. `strace` says: {{{ futex(0x24c8440, FUTEX_WAIT_PRIVATE, 0, NULL) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) --- SIGVTALRM {si_signo=SIGVTALRM, si_code=SI_TIMER, si_timerid=0, si_overrun=0, si_value={int=0, ptr=NULL}} --- rt_sigreturn({mask=[]}) = 202 futex(0x24c8440, FUTEX_WAIT_PRIVATE, 0, NULL) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) --- SIGVTALRM {si_signo=SIGVTALRM, si_code=SI_TIMER, si_timerid=0, si_overrun=0, si_value={int=0, ptr=NULL}} --- write(9, "\377\0\0\0\0\0\0\0", 8) = 8 rt_sigreturn({mask=[]}) = 202 futex(0x24c8440, FUTEX_WAIT_PRIVATE, 0, NULL) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) --- SIGVTALRM {si_signo=SIGVTALRM, si_code=SI_TIMER, si_timerid=0, si_overrun=0, si_value={int=0, ptr=NULL}} --- rt_sigreturn({mask=[]}) = 202 futex(0x24c8440, FUTEX_WAIT_PRIVATE, 0, NULL) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) --- SIGVTALRM {si_signo=SIGVTALRM, si_code=SI_TIMER, si_timerid=0, si_overrun=0, si_value={int=0, ptr=NULL}} --- rt_sigreturn({mask=[]}) = 202 futex(0x24c8440, FUTEX_WAIT_PRIVATE, 0, NULL^C) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) ^Cstrace: Process 13755 detached }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15716#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler