376
77%

Ran 12 Feb 2018 08:38AM UTC

Jobs 1

Files 36

Run time 3s

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Build # 376

Build Type

push

travis-ci

Committed by

ivmai

Commit Message

Avoid potential race between realloc and clear_hdr_marks/reclaim_generic

GC_realloc might be changing the block size while GC_reclaim_block
or GC_clear_hdr_marks is examining it.  The change to the size field
is benign, in that GC_reclaim (and GC_clear_hdr_marks) would work
correctly with either value, since we are not changing the number
of objects in the block.  But seeing a half-updated value (though
unlikely to occur in practice) could be probably bad.
Using unordered atomic accesses on the size and hb_descr fields would
solve the issue.

* mallocx.c [AO_HAVE_store] (GC_realloc): Use AO_store() to update
hhdr->hb_sz and hhdr->hb_descr; add static assert that size of
hhdr->hb_sz matches that of AO_t; add comment.
* mallocx.c [!AO_HAVE_store] (GC_realloc): Add LOCK/UNLOCK around
hb_sz and hb_descr fields assignment.
* mark.c [AO_HAVE_load] (GC_clear_hdr_marks): Use AO_load() to get
hhdr->hb_sz value; add comment.
* reclaim.c (IS_PTRFREE_SAFE): New macro (uses AO_load() if available).
* reclaim.c (GC_reclaim_generic, GC_reclaim_block): Replace
(hhdr)->hb_descr==0 with IS_PTRFREE_SAFE(hhdr).

Run Details

5129 of 7424 relevant lines covered (69.09%)

1325249.64 hits per line

Jobs

ID	Job ID	Ran	Files	Coverage
28	376.28 (CONF_OPTIONS="--enable-gcov --enable-handle-fork --enable-munmap --enable-single-obj-compilation --enable-cplusplus --disable-shared --enable-gc-assertions" CFLAGS_EXTRA="-D USE_CUSTOM_SPECIFIC" REPORT_COVERAGE=true)	12 Feb 2018 08:38AM UTC	0	69.09	Travis Job 376.28

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