[GHC] #15544: Non-deterministic segmentation fault in cryptohash-sha256 testsuite

[GHC]

#15544: Non-deterministic segmentation fault in cryptohash-sha256 testsuite
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  highest           |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D5145
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by osa1):

 When I disable signal handling in tasty I can see the segfault in gdb:

 {{{
 Thread 2 (Thread 27849.27861):
 #0  0x000000420032dab1 in ?? ()
 #1  0x0000000000000000 in ?? ()
 }}}

 GHC stack:

 {{{
 >>> python import ghc_gdb
 >>> ghc backtrace
 Sp = 0x42001ca2a0
 0: RET_SMALL
   return=0x90bec0
 <bytestringzm0zi10zi8zi2_DataziByteStringziLazzy_fromChunkszugo_info+40>
   field 0: Ptr  0x42000350a0  : THUNK_0_1
 1: UPDATE_FRAME(0x4200035000: THUNK_1_0)
 2: RET_SMALL
   return=0x8f9190
 <bytestringzm0zi10zi8zi2_DataziByteStringziLazzy_toChunkszugo_info+56>
 3: UPDATE_FRAME(0x4200035048: THUNK_1_0)
 4: RET_SMALL
   return=0x689d30 <s7uE_info+440>
   field 0: Word 283469849024
 5: RET_SMALL
   return=0xaa5f50 <base_ForeignziMarshalziAlloc_allocaBytes1_info+200>
   field 0: Ptr  0x42001ea1b0  : ARR_WORDS
 6: RET_SMALL
   return=0x689ee0
 <cryptohashzmsha256zm0zi11zi101zi0zminplace_CryptoziHashziSHA256_hashlazzy_info+80>
 7: RET_SMALL
   return=0x409a20 <rdc4_info+200>
 8: UPDATE_FRAME(0x42001ca430: BLACKHOLE)
 9: RET_SMALL
   return=0x40b270 <rdc8_info+56>
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15544#comment:30>
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