[GHC] #14329: GHC 8.2.1 segfaults while bootstrapping master

[GHC]

#14329: GHC 8.2.1 segfaults while bootstrapping master
-------------------------------------+-------------------------------------
           Reporter:  bgamari        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  highest        |         Milestone:  8.2.2
          Component:  Compiler       |           Version:  8.2.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 Earlier this week the Linux/amd64 Harbormaster started failing somewhat
 reliably during validation. It seems the stage0 compiler (GHC 8.2.1) often
 fails with a segmentation fault. This seems to have started with
 ef26182e2014b0a2a029ae466a4b121bf235e4e4 although I suspect this isn't
 causal. I was able to capture a core dump of the crashing stage0 compiler
 which implicates the allocator,
 {{{
 Reading symbols from /opt/ghc/8.2.1/lib/ghc-8.2.1/bin/ghc...(no debugging
 symbols found)...done.
 [New LWP 25151]
 [New LWP 25160]
 [New LWP 25156]
 [New LWP 25158]
 [New LWP 25157]
 [Thread debugging using libthread_db enabled]
 Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
 Core was generated by `/opt/ghc/8.2.1/lib/ghc-8.2.1/bin/ghc
 -B/opt/ghc/8.2.1/lib/ghc-8.2.1 -hisuf hi -'.
 Program terminated with signal SIGSEGV, Segmentation fault.
 #0  0x00007f836aaa2c90 in ?? () from
 /opt/ghc/8.2.1/lib/ghc-8.2.1/bin/../rts/libHSrts_thr-ghc8.2.1.so
 [Current thread is 1 (Thread 0x7f83711b5340 (LWP 25151))]
 (gdb) bt
 #0  0x00007f836aaa2c90 in ?? () from
 /opt/ghc/8.2.1/lib/ghc-8.2.1/bin/../rts/libHSrts_thr-ghc8.2.1.so
 #1  0x00007f836aaa3211 in allocGroupOnNode () from
 /opt/ghc/8.2.1/lib/ghc-8.2.1/bin/../rts/libHSrts_thr-ghc8.2.1.so
 #2  0x00007f836aa9dd41 in ?? () from
 /opt/ghc/8.2.1/lib/ghc-8.2.1/bin/../rts/libHSrts_thr-ghc8.2.1.so
 #3  0x00007f836aa9deb9 in ?? () from
 /opt/ghc/8.2.1/lib/ghc-8.2.1/bin/../rts/libHSrts_thr-ghc8.2.1.so
 #4  0x00007f836aa82a39 in ?? () from
 /opt/ghc/8.2.1/lib/ghc-8.2.1/bin/../rts/libHSrts_thr-ghc8.2.1.so
 #5  0x00007f836aa7fc06 in ?? () from
 /opt/ghc/8.2.1/lib/ghc-8.2.1/bin/../rts/libHSrts_thr-ghc8.2.1.so
 #6  0x00007f836aa9d461 in ?? () from
 /opt/ghc/8.2.1/lib/ghc-8.2.1/bin/../rts/libHSrts_thr-ghc8.2.1.so
 #7  0x00007f836aaa423a in ?? () from
 /opt/ghc/8.2.1/lib/ghc-8.2.1/bin/../rts/libHSrts_thr-ghc8.2.1.so
 #8  0x00007f836aaa4b3c in ?? () from
 /opt/ghc/8.2.1/lib/ghc-8.2.1/bin/../rts/libHSrts_thr-ghc8.2.1.so
 #9  0x00007f836aa8bbc8 in ?? () from
 /opt/ghc/8.2.1/lib/ghc-8.2.1/bin/../rts/libHSrts_thr-ghc8.2.1.so
 #10 0x00007f836aa8c912 in ?? () from
 /opt/ghc/8.2.1/lib/ghc-8.2.1/bin/../rts/libHSrts_thr-ghc8.2.1.so
 #11 0x00007f836aa8da01 in scheduleWaitThread () from
 /opt/ghc/8.2.1/lib/ghc-8.2.1/bin/../rts/libHSrts_thr-ghc8.2.1.so
 #12 0x00007f836aa99fae in hs_main () from
 /opt/ghc/8.2.1/lib/ghc-8.2.1/bin/../rts/libHSrts_thr-ghc8.2.1.so
 #13 0x0000000000427038 in ?? ()
 #14 0x00007f83694fd2b1 in __libc_start_main (main=0x426fd0, argc=119,
 argv=0x7fffcfee8078, init=<optimized out>, fini=<optimized out>,
 rtld_fini=<optimized out>, stack_end=0x7fffcfee8068) at ../csu/libc-
 start.c:291
 #15 0x0000000000427069 in ?? ()
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14329>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler