commit 56e7dff7bd4769c2a255aac7c9d266914bbf9f57 Author: Mike Perry mikeperry-git@fscked.org Date: Mon Mar 25 16:05:42 2013 -0700

Add additional checks for Path Bias scaling.

Just in case more issues remain with scaling, it would be nice to pin-point them as such. --- src/or/circuitbuild.c | 34 ++++++++++++++++++++++++++++++++++ 1 files changed, 34 insertions(+), 0 deletions(-)

diff --git a/src/or/circuitbuild.c b/src/or/circuitbuild.c index 7db2b70..df56877 100644 --- a/src/or/circuitbuild.c +++ b/src/or/circuitbuild.c @@ -1734,6 +1734,13 @@ pathbias_count_use_success(origin_circuit_t *circ) guard->use_successes++; entry_guards_changed();

+ if (guard->use_attempts < guard->use_successes) { + log_notice(LD_BUG, "Unexpectedly high use successes counts (%f/%f) " + "for guard %s=%s", + guard->use_successes, guard->use_attempts, + guard->nickname, hex_str(guard->identity, DIGEST_LEN)); + } + log_debug(LD_CIRC, "Marked circuit %d (%f/%f) as used successfully for guard " "%s ($%s).", @@ -2481,6 +2488,9 @@ pathbias_scale_close_rates(entry_guard_t *guard) int opened_built = pathbias_count_circs_in_states(guard, PATH_STATE_BUILD_SUCCEEDED, PATH_STATE_USE_FAILED); + /* Verify that the counts are sane before and after scaling */ + int counts_are_sane = (guard->circ_attempts >= guard->circ_successes); + guard->circ_attempts -= opened_attempts; guard->circ_successes -= opened_built;

@@ -2502,6 +2512,16 @@ pathbias_scale_close_rates(entry_guard_t *guard) guard->circ_successes, guard->successful_circuits_closed, guard->circ_attempts, opened_built, opened_attempts, guard->nickname, hex_str(guard->identity, DIGEST_LEN)); + + /* Have the counts just become invalid by this scaling attempt? */ + if (counts_are_sane && guard->circ_attempts < guard->circ_successes) { + log_notice(LD_BUG, + "Scaling has mangled pathbias counts to %f/%f (%d/%d open) " + "for guard %s ($%s)", + guard->circ_successes, guard->circ_attempts, opened_built, + opened_attempts, guard->nickname, + hex_str(guard->identity, DIGEST_LEN)); + } } }

@@ -2524,6 +2544,9 @@ pathbias_scale_use_rates(entry_guard_t *guard) double scale_ratio = pathbias_get_scale_ratio(options); int opened_attempts = pathbias_count_circs_in_states(guard, PATH_STATE_USE_ATTEMPTED, PATH_STATE_USE_SUCCEEDED); + /* Verify that the counts are sane before and after scaling */ + int counts_are_sane = (guard->use_attempts >= guard->use_successes); + guard->use_attempts -= opened_attempts;

guard->use_attempts *= scale_ratio; @@ -2535,6 +2558,17 @@ pathbias_scale_use_rates(entry_guard_t *guard) "Scaled pathbias use counts to %f/%f (%d open) for guard %s ($%s)", guard->use_successes, guard->use_attempts, opened_attempts, guard->nickname, hex_str(guard->identity, DIGEST_LEN)); + + /* Have the counts just become invalid by this scaling attempt? */ + if (counts_are_sane && guard->use_attempts < guard->use_successes) { + log_notice(LD_BUG, + "Scaling has mangled pathbias usage counts to %f/%f " + "(%d open) for guard %s ($%s)", + guard->circ_successes, guard->circ_attempts, + opened_attempts, guard->nickname, + hex_str(guard->identity, DIGEST_LEN)); + } + entry_guards_changed(); } }