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mdbx: check for oldest-aware corruption by writer in txn_renew().

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Change-Id: I1a49e4264feb93dc84963db426b11f467f31fcf6
This commit is contained in:
Leo Yuriev 2017-07-14 13:22:15 +03:00
parent ddc5b9f34f
commit b4e0344de7
1 changed files with 15 additions and 4 deletions
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19
src/mdbx.c
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@ -1523,7 +1523,7 @@ static txnid_t mdbx_find_oldest(MDBX_txn *txn) {
lck->mti_reader_finished_flag = MDBX_STRING_TETRAD("None");
for (unsigned i = 0; i < snap_nreaders; ++i) {
if (lck->mti_readers[i].mr_pid) {
mdbx_jitter4testing(true);
/* mdbx_jitter4testing(true); */
const txnid_t snap = lck->mti_readers[i].mr_txnid;
if (oldest > snap && last_oldest <= /* ignore pending updates */ snap) {
oldest = snap;
@ -1534,6 +1534,7 @@ static txnid_t mdbx_find_oldest(MDBX_txn *txn) {
}
if (oldest != last_oldest) {
mdbx_notice("update oldest %" PRIaTXN " -> %" PRIaTXN, last_oldest, oldest);
mdbx_tassert(txn, oldest >= lck->mti_oldest);
lck->mti_oldest = oldest;
}
@ -1663,7 +1664,6 @@ static int mdbx_page_alloc(MDBX_cursor *mc, unsigned num, MDBX_page **mp,
}
}
const MDBX_meta *head = mdbx_meta_head(env);
pgno_t pgno, *repg_list = env->me_reclaimed_pglist;
unsigned repg_pos = 0, repg_len = repg_list ? repg_list[0] : 0;
txnid_t oldest = 0, last = 0;
@ -1865,6 +1865,7 @@ static int mdbx_page_alloc(MDBX_cursor *mc, unsigned num, MDBX_page **mp,
goto done;
}
const MDBX_meta *head = mdbx_meta_head(env);
if ((flags & MDBX_ALLOC_GC) &&
((flags & MDBX_ALLOC_KICK) || rc == MDBX_MAP_FULL)) {
MDBX_meta *steady = mdbx_meta_steady(env);
@ -2436,12 +2437,20 @@ static int mdbx_txn_renew0(MDBX_txn *txn, unsigned flags) {
/* LY: Retry on a race, ITS#7970. */
mdbx_compiler_barrier();
if (likely(meta == mdbx_meta_head(env) &&
snap == mdbx_meta_txnid_fluid(env, meta))) {
snap == mdbx_meta_txnid_fluid(env, meta) &&
snap >= env->me_oldest[0])) {
mdbx_jitter4testing(false);
break;
}
if (env->me_lck)
env->me_lck->mti_reader_finished_flag = true;
}
if (unlikely(txn->mt_txnid == 0)) {
mdbx_error("environment corrupted by died writer, must shutdown!");
rc = MDBX_WANNA_RECOVERY;
goto bailout;
}
mdbx_assert(env, txn->mt_txnid >= *env->me_oldest);
txn->mt_ro_reader = r;
txn->mt_dbxs = env->me_dbxs; /* mostly static anyway */
@ -2498,7 +2507,7 @@ static int mdbx_txn_renew0(MDBX_txn *txn, unsigned flags) {
txn->mt_dbflags[FREE_DBI] = DB_VALID;
if (unlikely(env->me_flags & MDBX_FATAL_ERROR)) {
mdbx_debug("environment had fatal error, must shutdown!");
mdbx_warning("environment had fatal error, must shutdown!");
rc = MDBX_PANIC;
} else {
const size_t size = pgno2bytes(env, txn->mt_end_pgno);
@ -10448,6 +10457,8 @@ static txnid_t __cold mdbx_oomkick(MDBX_env *env, const txnid_t laggard) {
env->me_oom_func(env, 0, 0, laggard,
(gap < UINT_MAX) ? (unsigned)gap : UINT_MAX, -retry);
}
mdbx_notice("oom-kick: update oldest %" PRIaTXN " -> %" PRIaTXN,
env->me_oldest[0], oldest);
mdbx_assert(env, env->me_oldest[0] <= oldest);
return env->me_oldest[0] = oldest;
}