Dominique Pelle wrote:
> vim seems to be leaking memory when doing ":so %" with "syntax on" setting.
>
> Steps to reproduce:
>
> 1/ create a simple script as follows:
>
> $ cat leak.vim
> " leaks memory when doing ":so %" while this file is loaded in vim
> syntax on
>
> 2/ start vim
>
> $ valgrind --leak-check=yes vim -u NONE -U NONE leak.vim 2> vg.log
>
> 3/ in vim, source the current buffer (leak.vim), then quit
>
> :so %
> :q
>
> 4/ observe that valgrind reports a memory leak
>
> ==18415== 22 bytes in 4 blocks are definitely lost in loss record 2 of 15
> ==18415== at 0x4021620: malloc (vg_replace_malloc.c:149)
> ==18415== by 0x8102F4C: lalloc (misc2.c:857)
> ==18415== by 0x8102E6E: alloc (misc2.c:756)
> ==18415== by 0x818C3B1: get_id_list (syntax.c:5761)
> ==18415== by 0x81898E6: get_syn_options (syntax.c:4338)
> ==18415== by 0x818A5E6: syn_cmd_region (syntax.c:4785)
> ==18415== by 0x818C84A: ex_syntax (syntax.c:5974)
> ==18415== by 0x809B897: do_one_cmd (ex_docmd.c:2621)
> ==18415== by 0x80990FC: do_cmdline (ex_docmd.c:1099)
> ==18415== by 0x80973A1: do_source (ex_cmds2.c:3054)
> ==18415== by 0x8189DBF: syn_cmd_include (syntax.c:4494)
> ==18415== by 0x818C84A: ex_syntax (syntax.c:5974)
>
> Whenever Ex command ":so %" is run, with "syntax on" in script,
> 4 more blocks of memory leak, i.e.:
>
> - If I do ":so %" once, I see:
> 22 bytes in 4 blocks are definitely lost in loss record 2 of 15
> - If I do ":so %" twice, I see:
> 44 bytes in 8 blocks are definitely lost in loss record 11 of 15
> - I I do ": so %" three times, I see:
> 66 bytes in 12 blocks are definitely lost in loss record 10 of 15
> - etc.
>
> I built vim-7.1.135 on Linux with:
> - configure --with-features=huge
> - changed src/Makefile to compile without optimisation (-O0)
> - changed src/Makefile to enable PROFILE_CFLAGS = -DEXITFREE
>
> I don't have a patch as I am unsure where it should be freed.
It's not clear to me what memory is leaked (if any is really leaked,
valgrind may give a false warning). When I put this line before "syntax
on" it appears to disappear:
let g:vimembedscript= 0
So it's related to ":syn include".
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