FAQ
On Wed, Mar 18, 2015 at 05:13:54AM -0700, David Hoekman wrote:

Thanks for the concise and interesting bug report.
There might be a whole bunch more things that break in a similar way...
perl6-m -e 'say [max] 1..(1+2**15)'
arg flag is empty in slurpy positional
in sub infix:<max> at src/gen/m-CORE.setting:2181
in sub at src/gen/m-CORE.setting:20740
in block <unit> at -e:1
$ ./perl6-m -Ilib -e 'say [max] 1..(1+2**15)'
ASAN:SIGSEGV
=================================================================
==1476==ERROR: AddressSanitizer: SEGV on unknown address 0x000000040000 (pc 0x7fa75096588a sp 0x7fffda54e0e0 bp 0x7fffda54e210 T0)
     #0 0x7fa750965889 in flatten_args src/core/args.c:711
     #1 0x7fa75095aff7 in MVM_args_checkarity src/core/args.c:140
     #2 0x7fa750979e30 in MVM_interp_run src/core/interp.c:573
     #3 0x7fa750bf4f8b in MVM_vm_run_file src/moar.c:210
     #4 0x4019bf in main src/main.c:189
     #5 0x7fa750267d5c in __libc_start_main (/lib64/libc.so.6+0x1ed5c)
     #6 0x400fc8 (/home/nicholas/Sandpit/moar-san/bin/moar+0x400fc8)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV src/core/args.c:711 flatten_args
==1476==ABORTING

and a non-ASAN build under valgrind reports

==17316==
==17316== Invalid write of size 8
==17316== at 0x4F4D91B: flatten_args (args.c:711)
==17316== by 0x4F4A427: MVM_args_checkarity (args.c:140)
==17316== by 0x4F54721: MVM_interp_run (interp.c:573)
==17316== by 0x5039D5C: MVM_vm_run_file (moar.c:210)
==17316== by 0x401250: main (main.c:189)
==17316== Address 0x40000 is not stack'd, malloc'd or (recently) free'd
==17316==
==17316==
==17316== Process terminating with default action of signal 11 (SIGSEGV)
==17316== Access not within mapped region at address 0x40000
==17316== at 0x4F4D91B: flatten_args (args.c:711)
==17316== by 0x4F4A427: MVM_args_checkarity (args.c:140)
==17316== by 0x4F54721: MVM_interp_run (interp.c:573)
==17316== by 0x5039D5C: MVM_vm_run_file (moar.c:210)
==17316== by 0x401250: main (main.c:189)


Is this something to do with P6Int having alternative storage representations?

If so, it implies that some more tests would be useful for values around the
switchover points.

(To be robust I'd suggest testing all ranges ±2 around values 256**n for
n 0 to 9)

Nicholas Clark

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postedMar 18, '15 at 12:14p
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