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I hacked the thread-id into deb.c/Perl_vdeb() so that perl -Dt also prints thread-id. The crashes seem to occur when one thread does a POPBLOCK/LEAVE as a sort finishes inside the for(). I further noticed that when I change:

for my $k (sort mycmp @list) {}

to simply:

sort mycmp @list;

the crashes go away. Edited perl -Dtlsv output follows:

4440: (p5-5A.pl:7) gvsv(main::a) 4440: (p5-5A.pl:7) length 4440: (p5-5A.pl:7) ncmp 4440: (p5-5A.pl:7) leavesub 4440: (p5-5A.pl:7) nextstate 4440: (p5-5A.pl:7) gvsv(main::b) 4440: (p5-5A.pl:7) length 4440: (p5-5A.pl:7) gvsv(main::a) 4440: (p5-5A.pl:7) length 9432: (p5-5A.pl:7) length 9432: (p5-5A.pl:7) ncmp 9432: (p5-5A.pl:7) leavesub 9432: (p5-5A.pl:7) nextstate 9432: (p5-5A.pl:7) gvsv(main::b) 9432: (p5-5A.pl:7) length 9432: (p5-5A.pl:7) gvsv(main::a) 9432: (p5-5A.pl:7) length 9432: (p5-5A.pl:7) ncmp 4440: (p5-5A.pl:7) ncmp 4440: (p5-5A.pl:7) leavesub 4440: (p5-5A.pl:7) nextstate 4440: (p5-5A.pl:7) gvsv(main::b) 4440: (p5-5A.pl:7) length 4440: (p5-5A.pl:7) gvsv(main::a) 4440: (p5-5A.pl:7) length 4440: (p5-5A.pl:7) ncmp *** tid=4440 crashed around here *** 9432: (p5-5A.pl:7) leavesub 9432: (p5-5A.pl:19) POPBLOCK scope 7 at ..\pp_sort.c:1579 9432: (p5-5A.pl:19) LEAVE scope 7 at ..\pp_sort.c:1627 9432: (p5-5A.pl:19) enteriter 9432: (p5-5A.pl:19) ENTER scope 7 at ..\pp_ctl.c:1666 9432: (p5-5A.pl:19) ENTER scope 8 at ..\pp_ctl.c:1697 9432: (p5-5A.pl:19) iter 9432: (p5-5A.pl:19) and (tid=9432 continues on)

In reply to Re: Perl threads sort test program crashes by eyepopslikeamosquito
in thread Perl threads sort test program crashes by eyepopslikeamosquito

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