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Make buf_shrink_freelists warn, not crash, when n_to_skip is too high

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This mitigates bug 1125, but doesn't fix its root cause (whatever
that is).
This commit is contained in:
Nick Mathewson 2010-08-10 15:58:41 -04:00
parent 0087a37bed
commit 8150e2ad24
2 changed files with 20 additions and 4 deletions
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5
changes/warn1125 Normal file
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@ -0,0 +1,5 @@
o Minor bugfixes:
- Instead of giving an assertion failure on an internal mismatch
on estimated freelist size, just log a BUG warning and try later.
Mitigates but does not fix bug 1125.

19
src/or/buffers.c
View File

@ -270,14 +270,25 @@ buf_shrink_freelists(int free_all)
(freelists[i].lowest_length - slack);
int n_to_skip = freelists[i].cur_length - n_to_free;
int orig_n_to_free = n_to_free, n_freed=0;
int orig_n_to_skip = n_to_skip;
int new_length = n_to_skip;
chunk_t **chp = &freelists[i].head;
chunk_t *chunk;
log_info(LD_MM, "Cleaning freelist for %d-byte chunks: keeping %d, "
"dropping %d.",
(int)freelists[i].alloc_size, n_to_skip, n_to_free);
log_info(LD_MM, "Cleaning freelist for %d-byte chunks: length %d, "
"keeping %d, dropping %d.",
(int)freelists[i].alloc_size, freelists[i].cur_length,
n_to_skip, n_to_free);
tor_assert(n_to_skip + n_to_free == freelists[i].cur_length);
while (n_to_skip) {
tor_assert((*chp)->next);
if (! (*chp)->next) {
log_warn(LD_BUG, "I wanted to skip %d chunks in the freelist for "
"%d-byte chunks, but only found %d. (Length %d)",
orig_n_to_skip, (int)freelists[i].alloc_size,
orig_n_to_skip-n_to_skip, freelists[i].cur_length);
assert_freelist_ok(&freelists[i]);
return;
}
// tor_assert((*chp)->next);
chp = &(*chp)->next;
--n_to_skip;
}