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SEGV when running 'MVM_SPESH_NODELAY=1 MVM_SPESH_BLOCKING=1 ./perl6 t/spec/S02-types/num.rakudo.moar' #791

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dogbert17 opened this issue Jan 30, 2018 · 4 comments
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SEGV when running 'MVM_SPESH_NODELAY=1 MVM_SPESH_BLOCKING=1 ./perl6 t/spec/S02-types/num.rakudo.moar' #791

dogbert17 opened this issue Jan 30, 2018 · 4 comments

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@dogbert17
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dogbert17 commented Jan 30, 2018 •
edited

Fails on both 32- and 64-bit Linux VM's

dilbert@Linux-Mint18 ~/repos/rakudo $ ./perl6 -v
This is Rakudo version 2018.01-60-g2c36ab2 built on MoarVM version 2018.01-49-g783a4f0
implementing Perl 6.c.

dilbert@Linux-Mint18 ~/repos/rakudo $ MVM_SPESH_NODELAY=1 MVM_SPESH_BLOCKING=1 ./perl6-gdb-m t/spec/S02-types/num.rakudo.moar
================================================================================================
This is Rakudo Perl 6 running in the GNU debugger, which often allows the user to generate useful back-
traces to debug or report issues in Rakudo, the MoarVM backend or the currently running code.

This Rakudo version is 2018.01.58.g.58.de.239 built on MoarVM version 2018.01.49.g.783.a.4.f.0,
running on linuxmint (18.3.Sylvia) / linux (4.10.0.38.generic)

Type `bt full` to generate a backtrace if applicable, type `q` to quit or `help` for help.
------------------------------------------------------------------------------------------------
Reading symbols from /home/dilbert/repos/rakudo/install/bin/moar...done.
Starting program: /home/dilbert/repos/rakudo/install/bin/moar --execname=./perl6-gdb-m --libpath=. --libpath=blib --libpath=/home/dilbert/repos/rakudo/install/share/nqp/lib --libpath=/home/dilbert/repos/rakudo/install/share/nqp/lib --libpath=/home/dilbert/repos/rakudo/install/share/nqp/lib /home/dilbert/repos/rakudo/perl6.moarvm --nqp-lib=blib t/spec/S02-types/num.rakudo.moar
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff6374700 (LWP 27527)]
1..98
ok 1 - EVAL 1.Num.perl is Num
ok 2 - EVAL 1.Num.perl is 1
ok 3 - EVAL 0.Num.perl is Num
...
[many passing tests skipped]
...
ok 97 - atanh(num)
ok 98 - Literal Nums close to the upper limit are not Inf
# FUDGED!

Thread 2 "moar" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff6374700 (LWP 27527)]
0x00007ffff76da6f5 in MVM_multi_cache_find_spesh (tc=0x6760c0, cache_obj=0x42574c0, arg_info=0x7ffff6372330, type_tuple=0x7ffff0e91fc0) at src/6model/reprs/MVMMultiCache.c:500
500	                known_type_st = type_tuple[tt_offset].type->st;
(gdb) bt
#0  0x00007ffff76da6f5 in MVM_multi_cache_find_spesh (tc=0x6760c0, cache_obj=0x42574c0, arg_info=0x7ffff6372330, type_tuple=0x7ffff0e91fc0) at src/6model/reprs/MVMMultiCache.c:500
#1  0x00007ffff771fc1b in optimize_call (tc=0x6760c0, g=0x7ffff0d088a0, bb=0x7ffff09fb150, ins=0x7ffff0d04468, p=0x7ffff0d34ae0, callee_idx=1, arg_info=0x7ffff6372330) at src/spesh/optimize.c:1513
#2  0x00007ffff772169c in optimize_bb_switch (tc=0x6760c0, g=0x7ffff0d088a0, bb=0x7ffff09fb150, p=0x7ffff0d34ae0) at src/spesh/optimize.c:2038
#3  0x00007ffff7721bb3 in optimize_bb (tc=0x6760c0, g=0x7ffff0d088a0, bb=0x7ffff09fb150, p=0x7ffff0d34ae0) at src/spesh/optimize.c:2225
#4  0x00007ffff7721bed in optimize_bb (tc=0x6760c0, g=0x7ffff0d088a0, bb=0x7ffff09faf10, p=0x7ffff0d34ae0) at src/spesh/optimize.c:2229
#5  0x00007ffff7721bed in optimize_bb (tc=0x6760c0, g=0x7ffff0d088a0, bb=0x7ffff09fac70, p=0x7ffff0d34ae0) at src/spesh/optimize.c:2229
#6  0x00007ffff7721bed in optimize_bb (tc=0x6760c0, g=0x7ffff0d088a0, bb=0x7ffff09fa7f0, p=0x7ffff0d34ae0) at src/spesh/optimize.c:2229
#7  0x00007ffff7721bed in optimize_bb (tc=0x6760c0, g=0x7ffff0d088a0, bb=0x7ffff09fa370, p=0x7ffff0d34ae0) at src/spesh/optimize.c:2229
#8  0x00007ffff7721bed in optimize_bb (tc=0x6760c0, g=0x7ffff0d088a0, bb=0x7ffff09fa0d0, p=0x7ffff0d34ae0) at src/spesh/optimize.c:2229
#9  0x00007ffff7721bed in optimize_bb (tc=0x6760c0, g=0x7ffff0d088a0, bb=0x7ffff0d05aa0, p=0x7ffff0d34ae0) at src/spesh/optimize.c:2229
#10 0x00007ffff7721bed in optimize_bb (tc=0x6760c0, g=0x7ffff0d088a0, bb=0x7ffff0d05800, p=0x7ffff0d34ae0) at src/spesh/optimize.c:2229
#11 0x00007ffff7721bed in optimize_bb (tc=0x6760c0, g=0x7ffff0d088a0, bb=0x7ffff0d05500, p=0x7ffff0d34ae0) at src/spesh/optimize.c:2229
#12 0x00007ffff7721bed in optimize_bb (tc=0x6760c0, g=0x7ffff0d088a0, bb=0x7ffff0d05260, p=0x7ffff0d34ae0) at src/spesh/optimize.c:2229
#13 0x00007ffff7721bed in optimize_bb (tc=0x6760c0, g=0x7ffff0d088a0, bb=0x7ffff0d04fc0, p=0x7ffff0d34ae0) at src/spesh/optimize.c:2229
#14 0x00007ffff7721bed in optimize_bb (tc=0x6760c0, g=0x7ffff0d088a0, bb=0x7ffff0d04d20, p=0x7ffff0d34ae0) at src/spesh/optimize.c:2229
#15 0x00007ffff7721bed in optimize_bb (tc=0x6760c0, g=0x7ffff0d088a0, bb=0x7ffff0d04a80, p=0x7ffff0d34ae0) at src/spesh/optimize.c:2229
#16 0x00007ffff7721bed in optimize_bb (tc=0x6760c0, g=0x7ffff0d088a0, bb=0x7ffff0d047e0, p=0x7ffff0d34ae0) at src/spesh/optimize.c:2229
#17 0x00007ffff7721bed in optimize_bb (tc=0x6760c0, g=0x7ffff0d088a0, bb=0x7ffff0d04660, p=0x7ffff0d34ae0) at src/spesh/optimize.c:2229
#18 0x00007ffff7721bed in optimize_bb (tc=0x6760c0, g=0x7ffff0d088a0, bb=0x7ffff0d045a0, p=0x7ffff0d34ae0) at src/spesh/optimize.c:2229
#19 0x00007ffff77227a1 in MVM_spesh_optimize (tc=0x6760c0, g=0x7ffff0d088a0, p=0x7ffff0d34ae0) at src/spesh/optimize.c:2475
#20 0x00007ffff7714019 in MVM_spesh_candidate_add (tc=0x6760c0, p=0x7ffff0d34ae0) at src/spesh/candidate.c:62
#21 0x00007ffff77299aa in worker (tc=0x6760c0, callsite=0x7ffff7dd5f20 <null_args_callsite>, args=0x0) at src/spesh/worker.c:13
#22 0x00007ffff76bfe4f in invoke_handler (tc=0x6760c0, invokee=0x668e80, callsite=0x7ffff7dd5f20 <null_args_callsite>, args=0x0) at src/6model/reprs/MVMCFunction.c:9
#23 0x00007ffff7676a07 in thread_initial_invoke (tc=0x6760c0, data=0x6777e0) at src/core/threads.c:59
#24 0x00007ffff7638ef8 in MVM_interp_run (tc=0x6760c0, initial_invoke=0x7ffff767697c <thread_initial_invoke>, invoke_data=0x6777e0) at src/core/interp.c:93
#25 0x00007ffff7676ab9 in start_thread (data=0x6777e0) at src/core/threads.c:85
#26 0x00007ffff6b896ba in start_thread (arg=0x7ffff6374700) at pthread_create.c:333
#27 0x00007ffff71af41d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
(gdb) info threads
  Id   Target Id         Frame 
  1    Thread 0x7ffff7fd9700 (LWP 27523) "moar" pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
* 2    Thread 0x7ffff6374700 (LWP 27527) "moar" 0x00007ffff76da6f5 in MVM_multi_cache_find_spesh (tc=0x6760c0, cache_obj=0x42574c0, arg_info=0x7ffff6372330, type_tuple=0x7ffff0e91fc0)
    at src/6model/reprs/MVMMultiCache.c:500
@AlexDaniel
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AlexDaniel commented Jan 30, 2018 •
edited

For what it's worth, it's possible that it is a regression. rakudo/rakudo@8bed4a67b

<AlexDaniel> c: 8bed4a67b^,8bed4a67b run(:err, :out, :env(%(MVM_SPESH_NODELAY=>1, MVM_SPESH_BLOCKING=>1)), (run :out, ‘which’, ‘perl6-gdb-m’).out.slurp-rest.chomp, ‘sandbox/roast/S02-types/num.t’).out.slurp-rest.contains(‘SIGSEGV’).say
<committable6> AlexDaniel, ¦8bed4a67b^: «False␤» ¦8bed4a6: «True␤»

@dogbert17
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There's a slight possibility that the offending MoarVM commit is '388a769 Enable type tuple use in multi-dispatch'.

@dogbert17
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Fixed by nine++ with commit 0e73714

@dogbert17
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It was a test which uncovered the problem so we don't have to write new ones :)

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@AlexDaniel @dogbert17