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

12 Sep 2018


      #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
 
   field 0: Ptr  0x42000350a0  : THUNK_0_1
 1: UPDATE_FRAME(0x4200035000: THUNK_1_0)
 2: RET_SMALL
   return=0x8f9190
 
 3: UPDATE_FRAME(0x4200035048: THUNK_1_0)
 4: RET_SMALL
   return=0x689d30 
   field 0: Word 283469849024
 5: RET_SMALL
   return=0xaa5f50 
   field 0: Ptr  0x42001ea1b0  : ARR_WORDS
 6: RET_SMALL
   return=0x689ee0
 
 7: RET_SMALL
   return=0x409a20 
 8: UPDATE_FRAME(0x42001ca430: BLACKHOLE)
 9: RET_SMALL
   return=0x40b270 
 }}}
-- 
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15544#comment:30
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