This:

  commit 209f081ab87bb288cbbc0ffb71f37c0b60aa3f4c
  Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>
  Date:   Sun Feb 24 09:33:03 2013 +0100

     buffer: If sharing a GstMemory fails, fall back to copying it


appears to cause massive memory leaks (totem just went up to 2.9gig of resident memory).


-gstreamer/tests/check $ make gst/gstbuffer.valgrind
Running suite(s): GstBuffer
==32316== 144 bytes in 1 blocks are definitely lost in loss record 1,348 of 1,419
==32316==    at 0x4C2A26B: malloc (vg_replace_malloc.c:270)
==32316==    by 0x5A362F0: g_malloc (gmem.c:159)
==32316==    by 0x5A4B342: g_slice_alloc (gslice.c:1003)
==32316==    by 0x52C7167: _default_mem_share (gstallocator.c:392)
==32316==    by 0x52D182C: gst_buffer_copy_into (gstbuffer.c:430)
==32316==    by 0x52D2C69: gst_buffer_copy_region (gstbuffer.c:1742)
==32316==    by 0x403DEF: test_subbuffer (gstbuffer.c:86)
==32316==    by 0x4E3DEA7: srunner_run_all (check_run.c:372)
==32316==    by 0x4E3865C: gst_check_run_suite (gstcheck.c:663)
==32316==    by 0x401677: main (gstbuffer.c:768)
==32316== 
==32316== 299 (144 direct, 155 indirect) bytes in 1 blocks are definitely lost in loss record 1,386 of 1,419
==32316==    at 0x4C2A26B: malloc (vg_replace_malloc.c:270)
==32316==    by 0x5A362F0: g_malloc (gmem.c:159)
==32316==    by 0x5A4B342: g_slice_alloc (gslice.c:1003)
==32316==    by 0x52C7167: _default_mem_share (gstallocator.c:392)
==32316==    by 0x52D182C: gst_buffer_copy_into (gstbuffer.c:430)
==32316==    by 0x52D2C69: gst_buffer_copy_region (gstbuffer.c:1742)
==32316==    by 0x403AF3: test_subbuffer (gstbuffer.c:56)
==32316==    by 0x4E3DEA7: srunner_run_all (check_run.c:372)
==32316==    by 0x4E3865C: gst_check_run_suite (gstcheck.c:663)
==32316==    by 0x401677: main (gstbuffer.c:768)
==32316== 
==32317== 288 (144 direct, 144 indirect) bytes in 1 blocks are definitely lost in loss record 1,388 of 1,421
==32317==    at 0x4C2A26B: malloc (vg_replace_malloc.c:270)
==32317==    by 0x5A362F0: g_malloc (gmem.c:159)
==32317==    by 0x5A4B342: g_slice_alloc (gslice.c:1003)
==32317==    by 0x52C7167: _default_mem_share (gstallocator.c:392)
==32317==    by 0x52D182C: gst_buffer_copy_into (gstbuffer.c:430)
==32317==    by 0x52D2C69: gst_buffer_copy_region (gstbuffer.c:1742)
==32317==    by 0x4038BF: test_subbuffer_make_writable (gstbuffer.c:241)
==32317==    by 0x4E3DEA7: srunner_run_all (check_run.c:372)
==32317==    by 0x4E3865C: gst_check_run_suite (gstcheck.c:663)
==32317==    by 0x401677: main (gstbuffer.c:768)
==32317== 
==32319== 144 bytes in 1 blocks are definitely lost in loss record 1,352 of 1,423
==32319==    at 0x4C2A26B: malloc (vg_replace_malloc.c:270)
==32319==    by 0x5A362F0: g_malloc (gmem.c:159)
==32319==    by 0x5A4B342: g_slice_alloc (gslice.c:1003)
==32319==    by 0x52C7167: _default_mem_share (gstallocator.c:392)
==32319==    by 0x52D182C: gst_buffer_copy_into (gstbuffer.c:430)
==32319==    by 0x52D2C69: gst_buffer_copy_region (gstbuffer.c:1742)
==32319==    by 0x404B03: test_span (gstbuffer.c:136)
==32319==    by 0x4E3DEA7: srunner_run_all (check_run.c:372)
==32319==    by 0x4E3865C: gst_check_run_suite (gstcheck.c:663)
==32319==    by 0x401677: main (gstbuffer.c:768)
==32319== 
==32319== 299 (144 direct, 155 indirect) bytes in 1 blocks are definitely lost in loss record 1,390 of 1,423
==32319==    at 0x4C2A26B: malloc (vg_replace_malloc.c:270)
==32319==    by 0x5A362F0: g_malloc (gmem.c:159)
==32319==    by 0x5A4B342: g_slice_alloc (gslice.c:1003)
==32319==    by 0x52C7167: _default_mem_share (gstallocator.c:392)
==32319==    by 0x52D182C: gst_buffer_copy_into (gstbuffer.c:430)
==32319==    by 0x52D2C69: gst_buffer_copy_region (gstbuffer.c:1742)
==32319==    by 0x404AC1: test_span (gstbuffer.c:133)
==32319==    by 0x4E3DEA7: srunner_run_all (check_run.c:372)
==32319==    by 0x4E3865C: gst_check_run_suite (gstcheck.c:663)
==32319==    by 0x401677: main (gstbuffer.c:768)
==32319== 
100%: Checks: 11, Failures: 0, Errors: 0
make: *** [gst/gstbuffer.valgrind] Error 1

Adapter and meta test leak too.