(and other crashes) when using .hyper

[p6rt]

Migrated from rt.perl.org#125978 (status was 'open')

Searchable as RT125978$

[p6rt]

From perl6@6dof.xyz

* How to reproduce (where ip is the attached file)​:

  perl6 -e "say 'ip'.IO.lines.hyper.map(* ~~ /​:constant @​l = (1 ... 255).list; @​l ** 4 % '.'/).all.so"

* Expected output​:

  True

  that is, as without .hyper​:

  perl6 -e "say 'ip'.IO.lines.map(* ~~ /​:constant @​l = (1 ... 255).list; @​l ** 4 % '.'/).all.so"
  True

* Current output (any of the 5 following ones)​:

False

---

Segmentation fault (core dumped)

---

Internal error​: invalid thread ID 471 in GC work pass

---

Can only resume an exception object
  in any at /home/user/.rakudobrew/glr-nom/install/share/perl6/runtime/CORE.setting.moarvm​:1
  in sub THROW at /home/user/.rakudobrew/glr-nom/install/share/perl6/runtime/CORE.setting.moarvm​:1

---

*** Error in `/home/user/.rakudobrew/glr-nom/install/bin/moar'​: double free or corruption (!prev)​: 0x00007ff45c1c70b0 ***
======= Backtrace​: =========
/lib64/libc.so.6(+0x77d9e)[0x7ff46c267d9e]
/lib64/libc.so.6(cfree+0x5b5)[0x7ff46c2739f5]
/home/user/.rakudobrew/glr-nom/install/lib/libmoar.so(MVM_frame_dec_ref+0x93)[0x7ff46c711e33]
/home/user/.rakudobrew/glr-nom/install/lib/libmoar.so(MVM_frame_try_return+0x26b)[0x7ff46c7161fb]
/home/user/.rakudobrew/glr-nom/install/lib/libmoar.so(MVM_interp_run+0x12e3d)[0x7ff46c70dc2d]
/home/user/.rakudobrew/glr-nom/install/lib/libmoar.so(+0x16c4ce)[0x7ff46c7194ce]
/home/user/.rakudobrew/glr-nom/install/lib/libmoar.so(+0x217367)[0x7ff46c7c4367]
/lib64/libpthread.so.0(+0x752a)[0x7ff46bcd352a]
/lib64/libc.so.6(clone+0x6d)[0x7ff46c2f022d]

[p6rt]

From perl6@6dof.xyz

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10.18.94.65
10.18.94.65
10.18.94.65
10.18.94.65
10.18.94.65
10.129.92.1
10.129.92.1
10.129.92.1
10.129.92.1
10.157.9.59
10.157.9.59
10.157.5.182
10.157.9.59
10.157.9.59
10.157.12.133
10.157.12.133
10.157.12.133
10.157.12.133
10.157.12.133
10.129.108.16
10.129.108.16
10.129.92.1
10.129.92.1
10.129.92.1
10.129.92.1
10.129.92.1
10.129.92.1
10.129.102.49
10.129.166.109
10.129.167.165
10.129.167.165
10.129.167.165
10.129.167.3
10.129.167.3
10.129.102.49
10.129.102.49
164.129.122.163
164.129.122.163
164.129.122.163
164.129.122.163
164.129.122.163

[p6rt]

From perl6@6dof.xyz

Another way to produce such this issue​:

perl6 -e "say 'ip'.IO.lines.hyper.map(* ~~ /<{ (1...255).list }> '.'/).all.so"
Incompatible MROs in P6opaque rebless
  in any mixin at src/gen/m-Metamodel.nqp​:1273
  in whatevercode at -e​:1

Incompatible MROs in P6opaque rebless
  in any mixin at src/gen/m-Metamodel.nqp​:1273
  in whatevercode at -e​:1

Incompatible MROs in P6opaque rebless
  in any mixin at src/gen/m-Metamodel.nqp​:1273
  in whatevercode at -e​:1

Method 'NFA' not found for invocant of class 'Any'
  in whatevercode at -e​:1

Cannot invoke this object (REPR​: Null, cs = 0)

Segmentation fault (core dumped)

---

Incompatible MROs in P6opaque rebless
  in any mixin at src/gen/m-Metamodel.nqp​:1273
  in whatevercode at -e​:1

Incompatible MROs in P6opaque rebless
  in any mixin at src/gen/m-Metamodel.nqp​:1273
  in whatevercode at -e​:1

Incompatible MROs in P6opaque rebless
  in any mixin at src/gen/m-Metamodel.nqp​:1273
  in whatevercode at -e​:1

*** Error in `/home/user/.rakudobrew/glr-nom/install/bin/moar'​: double free or corruption (fasttop)​: 0x00007f44484c8360 ***
======= Backtrace​: =========
/lib64/libc.so.6(+0x77d9e)[0x7f44604a7d9e]
/lib64/libc.so.6(cfree+0x5b5)[0x7f44604b39f5]
/home/user/.rakudobrew/glr-nom/install/lib/libmoar.so(+0x19bc46)[0x7f4460988c46]
/home/user/.rakudobrew/glr-nom/install/lib/libmoar.so(MVM_interp_run+0x7c7)[0x7f446093b5b7]
/home/user/.rakudobrew/glr-nom/install/lib/libmoar.so(+0x16c4ce)[0x7f44609594ce]
/home/user/.rakudobrew/glr-nom/install/lib/libmoar.so(+0x217367)[0x7f4460a04367]
/lib64/libpthread.so.0(+0x752a)[0x7f445ff1352a]
/lib64/libc.so.6(clone+0x6d)[0x7f446053022d]

[p6rt]

From perl6@6dof.xyz

Another way to produce such this issue​:

perl6 -e "say 'ip'.IO.lines.hyper.map(* ~~ /<{ (1...255).list }> '.'/).all.so"
Incompatible MROs in P6opaque rebless
  in any mixin at src/gen/m-Metamodel.nqp​:1273
  in whatevercode at -e​:1

Incompatible MROs in P6opaque rebless
  in any mixin at src/gen/m-Metamodel.nqp​:1273
  in whatevercode at -e​:1

Incompatible MROs in P6opaque rebless
  in any mixin at src/gen/m-Metamodel.nqp​:1273
  in whatevercode at -e​:1

Method 'NFA' not found for invocant of class 'Any'
  in whatevercode at -e​:1

Cannot invoke this object (REPR​: Null, cs = 0)

Segmentation fault (core dumped)

---

Incompatible MROs in P6opaque rebless
  in any mixin at src/gen/m-Metamodel.nqp​:1273
  in whatevercode at -e​:1

Incompatible MROs in P6opaque rebless
  in any mixin at src/gen/m-Metamodel.nqp​:1273
  in whatevercode at -e​:1

Incompatible MROs in P6opaque rebless
  in any mixin at src/gen/m-Metamodel.nqp​:1273
  in whatevercode at -e​:1

*** Error in `/home/user/.rakudobrew/glr-nom/install/bin/moar'​: double free or corruption (fasttop)​: 0x00007f44484c8360
======= Backtrace​: =========
/lib64/libc.so.6(+0x77d9e)[0x7f44604a7d9e]
/lib64/libc.so.6(cfree+0x5b5)[0x7f44604b39f5]
/home/user/.rakudobrew/glr-nom/install/lib/libmoar.so(+0x19bc46)[0x7f4460988c46]
/home/user/.rakudobrew/glr-nom/install/lib/libmoar.so(MVM_interp_run+0x7c7)[0x7f446093b5b7]
/home/user/.rakudobrew/glr-nom/install/lib/libmoar.so(+0x16c4ce)[0x7f44609594ce]
/home/user/.rakudobrew/glr-nom/install/lib/libmoar.so(+0x217367)[0x7f4460a04367]
/lib64/libpthread.so.0(+0x752a)[0x7f445ff1352a]
/lib64/libc.so.6(clone+0x6d)[0x7f446053022d]

[p6rt]

From perl6@6dof.xyz

http://irclog.perlgeek.de/perl6/2015-09-14#i_11216866

19​:18 jnthn https://rt-archive.perl.org/perl6/Ticket/Display.html?id=125978 seems stable locally
19​:18 Perhaps thanks to my invocation race fixes
[...]
19​:19 jnthn cdc​: Maybe you could test ^^ on latest

I did some tests, and sadly it still segfaults​:

  $ perl6 -e "say 'ip'.IO.lines.hyper.map(* ~~ /<{ (1...255).list }> '.'/).list"
  *** Error in `/usr/local/cedric/.rakudobrew/moar-nom/install/bin/moar'​: double free or corruption (fasttop)​: 0x00007f6a94380bf0 ***
  Incompatible MROs in P6opaque rebless
  in any mixin at gen/moar/m-Metamodel.nqp​:1273
  in whatevercode at -e​:1

and​:

  $ perl6 -e "say 'ip'.IO.lines.hyper.map(* ~~ /<{ (1...255).list }> '.'/).list"
  *** Error in `/usr/local/cedric/.rakudobrew/moar-nom/install/bin/moar'​: free()​: invalid size​: 0x00007fb6a0114090 ***
  ======= Backtrace​: =========
  /lib64/libc.so.6(+0x7f93a)[0x7fb6a126393a]

where​:

  $ perl6 --version
  This is perl6 version 2015.07.1-928-g65d33be built on MoarVM version 2015.08-34-g113c3b5

[p6rt]

From @jnthn

On Mon Sep 14 13​:07​:32 2015, perl6@​6dof.xyz wrote​:

http://irclog.perlgeek.de/perl6/2015-09-14#i_11216866

19​:18 jnthn https://rt-archive.perl.org/perl6/Ticket/Display.html?id=125978 seems
stable locally
19​:18 Perhaps thanks to my invocation race fixes
[...]
19​:19 jnthn cdc​: Maybe you could test ^^ on latest

I did some tests, and sadly it still segfaults​:

$ perl6 -e "say 'ip'.IO.lines.hyper.map(* ~~ /<{ (1...255).list }>
'.'/).list"
*** Error in `/usr/local/cedric/.rakudobrew/moar-
nom/install/bin/moar'​: double free or corruption (fasttop)​:
0x00007f6a94380bf0 ***
Incompatible MROs in P6opaque rebless
in any mixin at gen/moar/m-Metamodel.nqp​:1273
in whatevercode at -e​:1

and​:

$ perl6 -e "say 'ip'.IO.lines.hyper.map(* ~~ /<{ (1...255).list }>
'.'/).list"
*** Error in `/usr/local/cedric/.rakudobrew/moar-
nom/install/bin/moar'​: free()​: invalid size​: 0x00007fb6a0114090 ***
======= Backtrace​: =========
/lib64/libc.so.6(+0x7f93a)[0x7fb6a126393a]

where​:

$ perl6 --version
This is perl6 version 2015.07.1-928-g65d33be built on MoarVM version
2015.08-34-g113c3b5

It seems that we do an EVAL when interpolating the regex, and that some issues with thread safety in the Perl 6 compiler (or perhaps in the way it gets code-gen'd) is at least somewhat to blame. This crashes in similar ways​:

perl6-m -e "await (^1000).map({ start { EVAL '/0|1|2/' } }); say 'ok'"

Turning on MVM_CROSS_THREAD_WRITE_LOG shows various suspect things.

[p6rt]

The RT System itself - Status changed from 'new' to 'open'