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| author | Florian Weimer <fweimer@redhat.com> | 2015-12-21 16:42:46 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2015-12-21 16:42:46 +0100 |
| commit | 90c400bd4904b0240a148f0b357a5cbc36179239 (patch) | |
| tree | c13c4282ac662fa9a7944a41e88ee8e13163cfab /malloc/malloc.c | |
| parent | b300455644e2945da05eb49d12d3a037f1408be1 (diff) | |
| download | glibc-90c400bd4904b0240a148f0b357a5cbc36179239.zip glibc-90c400bd4904b0240a148f0b357a5cbc36179239.tar.gz glibc-90c400bd4904b0240a148f0b357a5cbc36179239.tar.bz2 | |
malloc: Fix list_lock/arena lock deadlock [BZ #19182]
* malloc/arena.c (list_lock): Document lock ordering requirements.
(free_list_lock): New lock.
(ptmalloc_lock_all): Comment on free_list_lock.
(ptmalloc_unlock_all2): Reinitialize free_list_lock.
(detach_arena): Update comment. free_list_lock is now needed.
(_int_new_arena): Use free_list_lock around detach_arena call.
Acquire arena lock after list_lock. Add comment, including FIXME
about incorrect synchronization.
(get_free_list): Switch to free_list_lock.
(reused_arena): Acquire free_list_lock around detach_arena call
and attached threads counter update. Add two FIXMEs about
incorrect synchronization.
(arena_thread_freeres): Switch to free_list_lock.
* malloc/malloc.c (struct malloc_state): Update comments to
mention free_list_lock.
Diffstat (limited to 'malloc/malloc.c')
| -rw-r--r-- | malloc/malloc.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/malloc/malloc.c b/malloc/malloc.c index a030109..1a03079 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -1710,12 +1710,12 @@ struct malloc_state struct malloc_state *next; /* Linked list for free arenas. Access to this field is serialized - by list_lock in arena.c. */ + by free_list_lock in arena.c. */ struct malloc_state *next_free; /* Number of threads attached to this arena. 0 if the arena is on - the free list. Access to this field is serialized by list_lock - in arena.c. */ + the free list. Access to this field is serialized by + free_list_lock in arena.c. */ INTERNAL_SIZE_T attached_threads; /* Memory allocated from the system in this arena. */ |