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Re: [bug-gawk] Memory leak


From: Stephane Delsert
Subject: Re: [bug-gawk] Memory leak
Date: Thu, 30 Mar 2017 16:26:20 +0000

Thanks Andrew,

 

I did the modification but  that seems that doesn’t work :  I reach 1gb of memory  for almost 60 MM of records and that still growth

 

Best regards,

 

St├ęphane.

 

 

-----Original Message-----
From: Andrew J. Schorr [mailto:address@hidden
Sent: jeudi 30 mars 2017 17:20
To: Stephane Delsert <address@hidden>
Cc: address@hidden; address@hidden
Subject: Re: [bug-gawk] Memory leak

 

Hi,

 

> ==19925== 11,301,792 bytes in 117,727 blocks are still reachable in loss record 124 of 124

> ==19925==    at 0x4A0717A: malloc (vg_replace_malloc.c:298)

> ==19925==    by 0x480FDE: emalloc_real (awk.h:1820)

> ==19925==    by 0x482599: bcalloc (symbol.c:722)

> ==19925==    by 0x40BBDA: assoc_list (array.c:1329)

> ==19925==    by 0x4477C9: r_interpret (interpret.h:900)

> ==19925==    by 0x4605F8: main (main.c:518)

 

This is what worries me. It does seem to correspond to a leak related to using a user-defined sorting function. Looking at the code, I don't see why it's not getting freed, unless this test is bailing out early before we free the allocated instruction below:

 

        if (list == NULL || ! cmp_func || (assoc_kind & (AASC|ADESC)) != 0)

                                return list;    /* empty list or unsorted, or list already sorted */

 

We know that cmp_func is not NULL, but perhaps list is NULL or the assoc_kind flags were modified by symbol->alist. If this test fails, then we return before we pop the instruction and free it, so it's still on the stack and reachable...

 

Does the attached, not well-tested, patch fix your memory leak?

 

Regards,

Andy

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