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codership/wsrep-lib#83 Release lock before commit_order_enter()

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A high priority transaction T2 which calls commit_order_enter() with
client_state mutex locked may cause a deadlock if an another high
priority transaction T1 ordered before tries to access the transaction
T2 state.

As a fix, make sure that commit_order_enter() is never called with
client_state mutex locked.
This commit is contained in:
Teemu Ollakka
2019-02-18 09:02:33 +02:00
parent 8c2daa7e3d
commit 92024c7d50
1 changed files with 6 additions and 0 deletions
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6
src/transaction.cpp
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@ -431,7 +431,9 @@ int wsrep::transaction::before_commit()
{
ret = 0;
}
lock.unlock();
ret = ret || provider().commit_order_enter(ws_handle_, ws_meta_);
lock.lock();
if (ret)
{
state(lock, s_must_abort);
@ -749,7 +751,9 @@ int wsrep::transaction::after_statement()
{
if (ordered())
{
lock.unlock();
ret = provider().commit_order_enter(ws_handle_, ws_meta_);
lock.lock();
if (ret == 0)
{
provider().commit_order_leave(ws_handle_, ws_meta_);
@ -785,7 +789,9 @@ void wsrep::transaction::after_applying()
// been done.
if (state_ == s_aborted && ordered())
{
lock.unlock();
int ret(provider().commit_order_enter(ws_handle_, ws_meta_));
lock.lock();
if (ret == 0)
{
provider().commit_order_leave(ws_handle_, ws_meta_);