Hi Fritjof, frit...@alokat.org wrote on Fri, Dec 25, 2015 at 11:56:33AM +0100:
> it looks like there is a memory leak in libc. > In file "src/lib/libc/stdio/makebuf.c" line 62 malloc(3) is called, > but never freed, when printf(3) is called. I think that's a false positive. The pointer to the buffer is stored in the FILE object, specifically in fp->_bf._base, and that is freed in fclose(3), line 54. Or do you mean to say that _base is overwritten somewhere while it still points to the allocated memory? If so, where specifically? Yours, Ingo > $ valgrind --leak-check=full --show-leak-kinds=all /usr/sbin/apm > ==29572== Memcheck, a memory error detector > ==29572== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al. > ==29572== Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyright info > ==29572== Command: /usr/sbin/apm > ==29572== > ==29572== > ==29572== FILE DESCRIPTORS: 4 open at exit. > ==29572== Open file descriptor 3: /dev/apm > ==29572== at 0x5443A2A: open (<stdin>:2) > ==29572== by 0x1099B6: ??? (in /usr/sbin/apm) > ==29572== by 0x108FF0: ??? (in /usr/sbin/apm) > ==29572== > ==29572== Open file descriptor 2: > ==29572== <inherited from parent> > ==29572== > ==29572== Open file descriptor 1: > ==29572== <inherited from parent> > ==29572== > ==29572== Open file descriptor 0: > ==29572== <inherited from parent> > ==29572== > ==29572== > ==29572== HEAP SUMMARY: > ==29572== in use at exit: 65,536 bytes in 1 blocks > ==29572== total heap usage: 1 allocs, 0 frees, 65,536 bytes allocated > ==29572== > ==29572== 65,536 bytes in 1 blocks are still reachable in loss record 1 of 1 > ==29572== at 0x5019224: malloc (in > /usr/local/lib/valgrind/vgpreload_memcheck-amd64-openbsd.so) > ==29572== by 0x54AB15B: __smakebuf (makebuf.c:62) > ==29572== by 0x54A53A9: __swsetup (wsetup.c:73) > ==29572== by 0x548F2F7: __vfprintf (vfprintf.c:462) > ==29572== by 0x549211D: vfprintf (vfprintf.c:267) > ==29572== by 0x547700B: printf (printf.c:44) > ==29572== by 0x109B8F: ??? (in /usr/sbin/apm) > ==29572== by 0x108FF0: ??? (in /usr/sbin/apm) > ==29572== > ==29572== LEAK SUMMARY: > ==29572== definitely lost: 0 bytes in 0 blocks > ==29572== indirectly lost: 0 bytes in 0 blocks > ==29572== possibly lost: 0 bytes in 0 blocks > ==29572== still reachable: 65,536 bytes in 1 blocks > ==29572== suppressed: 0 bytes in 0 blocks > ==29572== > ==29572== For counts of detected and suppressed errors, rerun with: -v > ==29572== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
