From e2073424fd5a185781750347fbfbb0c108ef66fd Mon Sep 17 00:00:00 2001 From: Jeremy Rubin Date: Mon, 9 Jan 2017 11:13:37 -0500 Subject: Fix CCheckQueue IsIdle (potential) race condition and remove dangerous constructors. --- src/checkqueue.h | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) (limited to 'src') diff --git a/src/checkqueue.h b/src/checkqueue.h index 32e25d5c8c..ea12df66dd 100644 --- a/src/checkqueue.h +++ b/src/checkqueue.h @@ -127,6 +127,9 @@ private: } public: + //! Mutex to ensure only one concurrent CCheckQueueControl + boost::mutex ControlMutex; + //! Create a new check queue CCheckQueue(unsigned int nBatchSizeIn) : nIdle(0), nTotal(0), fAllOk(true), nTodo(0), fQuit(false), nBatchSize(nBatchSizeIn) {} @@ -161,12 +164,6 @@ public: { } - bool IsIdle() - { - boost::unique_lock lock(mutex); - return (nTotal == nIdle && nTodo == 0 && fAllOk == true); - } - }; /** @@ -177,16 +174,18 @@ template class CCheckQueueControl { private: - CCheckQueue* pqueue; + CCheckQueue * const pqueue; bool fDone; public: - CCheckQueueControl(CCheckQueue* pqueueIn) : pqueue(pqueueIn), fDone(false) + CCheckQueueControl() = delete; + CCheckQueueControl(const CCheckQueueControl&) = delete; + CCheckQueueControl& operator=(const CCheckQueueControl&) = delete; + explicit CCheckQueueControl(CCheckQueue * const pqueueIn) : pqueue(pqueueIn), fDone(false) { // passed queue is supposed to be unused, or NULL if (pqueue != NULL) { - bool isIdle = pqueue->IsIdle(); - assert(isIdle); + ENTER_CRITICAL_SECTION(pqueue->ControlMutex); } } @@ -209,6 +208,9 @@ public: { if (!fDone) Wait(); + if (pqueue != NULL) { + LEAVE_CRITICAL_SECTION(pqueue->ControlMutex); + } } }; -- cgit v1.2.3 From 96c7f2c3458950061b057fcd3daaf47b57e6bac7 Mon Sep 17 00:00:00 2001 From: Jeremy Rubin Date: Sat, 7 Jan 2017 19:51:23 -0500 Subject: Add CheckQueue Tests --- src/Makefile.test.include | 1 + src/test/checkqueue_tests.cpp | 442 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 443 insertions(+) create mode 100644 src/test/checkqueue_tests.cpp (limited to 'src') diff --git a/src/Makefile.test.include b/src/Makefile.test.include index 27b456240e..26b1b1067f 100644 --- a/src/Makefile.test.include +++ b/src/Makefile.test.include @@ -67,6 +67,7 @@ BITCOIN_TESTS =\ test/blockencodings_tests.cpp \ test/bloom_tests.cpp \ test/bswap_tests.cpp \ + test/checkqueue_tests.cpp \ test/coins_tests.cpp \ test/compress_tests.cpp \ test/crypto_tests.cpp \ diff --git a/src/test/checkqueue_tests.cpp b/src/test/checkqueue_tests.cpp new file mode 100644 index 0000000000..d89f9b770b --- /dev/null +++ b/src/test/checkqueue_tests.cpp @@ -0,0 +1,442 @@ +// Copyright (c) 2012-2017 The Bitcoin Core developers +// Distributed under the MIT software license, see the accompanying +// file COPYING or http://www.opensource.org/licenses/mit-license.php. + +#include "util.h" +#include "utiltime.h" +#include "validation.h" + +#include "test/test_bitcoin.h" +#include "checkqueue.h" +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include "random.h" + +// BasicTestingSetup not sufficient because nScriptCheckThreads is not set +// otherwise. +BOOST_FIXTURE_TEST_SUITE(checkqueue_tests, TestingSetup) + +static const int QUEUE_BATCH_SIZE = 128; + +struct FakeCheck { + bool operator()() + { + return true; + } + void swap(FakeCheck& x){}; +}; + +struct FakeCheckCheckCompletion { + static std::atomic n_calls; + bool operator()() + { + ++n_calls; + return true; + } + void swap(FakeCheckCheckCompletion& x){}; +}; + +struct FailingCheck { + bool fails; + FailingCheck(bool fails) : fails(fails){}; + FailingCheck() : fails(true){}; + bool operator()() + { + return !fails; + } + void swap(FailingCheck& x) + { + std::swap(fails, x.fails); + }; +}; + +struct UniqueCheck { + static std::mutex m; + static std::unordered_multiset results; + size_t check_id; + UniqueCheck(size_t check_id_in) : check_id(check_id_in){}; + UniqueCheck() : check_id(0){}; + bool operator()() + { + std::lock_guard l(m); + results.insert(check_id); + return true; + } + void swap(UniqueCheck& x) { std::swap(x.check_id, check_id); }; +}; + + +struct MemoryCheck { + static std::atomic fake_allocated_memory; + bool b {false}; + bool operator()() + { + return true; + } + MemoryCheck(){}; + MemoryCheck(const MemoryCheck& x) + { + // We have to do this to make sure that destructor calls are paired + // + // Really, copy constructor should be deletable, but CCheckQueue breaks + // if it is deleted because of internal push_back. + fake_allocated_memory += b; + }; + MemoryCheck(bool b_) : b(b_) + { + fake_allocated_memory += b; + }; + ~MemoryCheck(){ + fake_allocated_memory -= b; + + }; + void swap(MemoryCheck& x) { std::swap(b, x.b); }; +}; + +struct FrozenCleanupCheck { + static std::atomic nFrozen; + static std::condition_variable cv; + static std::mutex m; + // Freezing can't be the default initialized behavior given how the queue + // swaps in default initialized Checks. + bool should_freeze {false}; + bool operator()() + { + return true; + } + FrozenCleanupCheck() {} + ~FrozenCleanupCheck() + { + if (should_freeze) { + std::unique_lock l(m); + nFrozen = 1; + cv.notify_one(); + cv.wait(l, []{ return nFrozen == 0;}); + } + } + void swap(FrozenCleanupCheck& x){std::swap(should_freeze, x.should_freeze);}; +}; + +// Static Allocations +std::mutex FrozenCleanupCheck::m{}; +std::atomic FrozenCleanupCheck::nFrozen{0}; +std::condition_variable FrozenCleanupCheck::cv{}; +std::mutex UniqueCheck::m; +std::unordered_multiset UniqueCheck::results; +std::atomic FakeCheckCheckCompletion::n_calls{0}; +std::atomic MemoryCheck::fake_allocated_memory{0}; + +// Queue Typedefs +typedef CCheckQueue Correct_Queue; +typedef CCheckQueue Standard_Queue; +typedef CCheckQueue Failing_Queue; +typedef CCheckQueue Unique_Queue; +typedef CCheckQueue Memory_Queue; +typedef CCheckQueue FrozenCleanup_Queue; + + +/** This test case checks that the CCheckQueue works properly + * with each specified size_t Checks pushed. + */ +void Correct_Queue_range(std::vector range) +{ + auto small_queue = std::unique_ptr(new Correct_Queue {QUEUE_BATCH_SIZE}); + boost::thread_group tg; + for (auto x = 0; x < nScriptCheckThreads; ++x) { + tg.create_thread([&]{small_queue->Thread();}); + } + // Make vChecks here to save on malloc (this test can be slow...) + std::vector vChecks; + for (auto i : range) { + size_t total = i; + FakeCheckCheckCompletion::n_calls = 0; + CCheckQueueControl control(small_queue.get()); + while (total) { + vChecks.resize(std::min(total, (size_t) GetRand(10))); + total -= vChecks.size(); + control.Add(vChecks); + } + BOOST_REQUIRE(control.Wait()); + if (FakeCheckCheckCompletion::n_calls != i) { + BOOST_REQUIRE_EQUAL(FakeCheckCheckCompletion::n_calls, i); + BOOST_TEST_MESSAGE("Failure on trial " << i << " expected, got " << FakeCheckCheckCompletion::n_calls); + } + } + tg.interrupt_all(); + tg.join_all(); +} + +/** Test that 0 checks is correct + */ +BOOST_AUTO_TEST_CASE(test_CheckQueue_Correct_Zero) +{ + std::vector range; + range.push_back((size_t)0); + Correct_Queue_range(range); +} +/** Test that 1 check is correct + */ +BOOST_AUTO_TEST_CASE(test_CheckQueue_Correct_One) +{ + std::vector range; + range.push_back((size_t)1); + Correct_Queue_range(range); +} +/** Test that MAX check is correct + */ +BOOST_AUTO_TEST_CASE(test_CheckQueue_Correct_Max) +{ + std::vector range; + range.push_back(100000); + Correct_Queue_range(range); +} +/** Test that random numbers of checks are correct + */ +BOOST_AUTO_TEST_CASE(test_CheckQueue_Correct_Random) +{ + std::vector range; + range.reserve(100000/1000); + for (size_t i = 2; i < 100000; i += std::max((size_t)1, (size_t)GetRand(std::min((size_t)1000, ((size_t)100000) - i)))) + range.push_back(i); + Correct_Queue_range(range); +} + + +/** Test that failing checks are caught */ +BOOST_AUTO_TEST_CASE(test_CheckQueue_Catches_Failure) +{ + auto fail_queue = std::unique_ptr(new Failing_Queue {QUEUE_BATCH_SIZE}); + + boost::thread_group tg; + for (auto x = 0; x < nScriptCheckThreads; ++x) { + tg.create_thread([&]{fail_queue->Thread();}); + } + + for (size_t i = 0; i < 1001; ++i) { + CCheckQueueControl control(fail_queue.get()); + size_t remaining = i; + while (remaining) { + size_t r = GetRand(10); + + std::vector vChecks; + vChecks.reserve(r); + for (size_t k = 0; k < r && remaining; k++, remaining--) + vChecks.emplace_back(remaining == 1); + control.Add(vChecks); + } + bool success = control.Wait(); + if (i > 0) { + BOOST_REQUIRE(!success); + } else if (i == 0) { + BOOST_REQUIRE(success); + } + } + tg.interrupt_all(); + tg.join_all(); +} +// Test that a block validation which fails does not interfere with +// future blocks, ie, the bad state is cleared. +BOOST_AUTO_TEST_CASE(test_CheckQueue_Recovers_From_Failure) +{ + auto fail_queue = std::unique_ptr(new Failing_Queue {QUEUE_BATCH_SIZE}); + boost::thread_group tg; + for (auto x = 0; x < nScriptCheckThreads; ++x) { + tg.create_thread([&]{fail_queue->Thread();}); + } + + for (auto times = 0; times < 10; ++times) { + for (bool end_fails : {true, false}) { + CCheckQueueControl control(fail_queue.get()); + { + std::vector vChecks; + vChecks.resize(100, false); + vChecks[99] = end_fails; + control.Add(vChecks); + } + bool r =control.Wait(); + BOOST_REQUIRE(r || end_fails); + } + } + tg.interrupt_all(); + tg.join_all(); +} + +// Test that unique checks are actually all called individually, rather than +// just one check being called repeatedly. Test that checks are not called +// more than once as well +BOOST_AUTO_TEST_CASE(test_CheckQueue_UniqueCheck) +{ + auto queue = std::unique_ptr(new Unique_Queue {QUEUE_BATCH_SIZE}); + boost::thread_group tg; + for (auto x = 0; x < nScriptCheckThreads; ++x) { + tg.create_thread([&]{queue->Thread();}); + + } + + size_t COUNT = 100000; + size_t total = COUNT; + { + CCheckQueueControl control(queue.get()); + while (total) { + size_t r = GetRand(10); + std::vector vChecks; + for (size_t k = 0; k < r && total; k++) + vChecks.emplace_back(--total); + control.Add(vChecks); + } + } + bool r = true; + BOOST_REQUIRE_EQUAL(UniqueCheck::results.size(), COUNT); + for (size_t i = 0; i < COUNT; ++i) + r = r && UniqueCheck::results.count(i) == 1; + BOOST_REQUIRE(r); + tg.interrupt_all(); + tg.join_all(); +} + + +// Test that blocks which might allocate lots of memory free their memory agressively. +// +// This test attempts to catch a pathological case where by lazily freeing +// checks might mean leaving a check un-swapped out, and decreasing by 1 each +// time could leave the data hanging across a sequence of blocks. +BOOST_AUTO_TEST_CASE(test_CheckQueue_Memory) +{ + auto queue = std::unique_ptr(new Memory_Queue {QUEUE_BATCH_SIZE}); + boost::thread_group tg; + for (auto x = 0; x < nScriptCheckThreads; ++x) { + tg.create_thread([&]{queue->Thread();}); + } + for (size_t i = 0; i < 1000; ++i) { + size_t total = i; + { + CCheckQueueControl control(queue.get()); + while (total) { + size_t r = GetRand(10); + std::vector vChecks; + for (size_t k = 0; k < r && total; k++) { + total--; + // Each iteration leaves data at the front, back, and middle + // to catch any sort of deallocation failure + vChecks.emplace_back(total == 0 || total == i || total == i/2); + } + control.Add(vChecks); + } + } + BOOST_REQUIRE_EQUAL(MemoryCheck::fake_allocated_memory, 0); + } + tg.interrupt_all(); + tg.join_all(); +} + +// Test that a new verification cannot occur until all checks +// have been destructed +BOOST_AUTO_TEST_CASE(test_CheckQueue_FrozenCleanup) +{ + auto queue = std::unique_ptr(new FrozenCleanup_Queue {QUEUE_BATCH_SIZE}); + boost::thread_group tg; + bool fails = false; + for (auto x = 0; x < nScriptCheckThreads; ++x) { + tg.create_thread([&]{queue->Thread();}); + } + std::thread t0([&]() { + CCheckQueueControl control(queue.get()); + std::vector vChecks(1); + // Freezing can't be the default initialized behavior given how the queue + // swaps in default initialized Checks (otherwise freezing destructor + // would get called twice). + vChecks[0].should_freeze = true; + control.Add(vChecks); + control.Wait(); // Hangs here + }); + { + std::unique_lock l(FrozenCleanupCheck::m); + // Wait until the queue has finished all jobs and frozen + FrozenCleanupCheck::cv.wait(l, [](){return FrozenCleanupCheck::nFrozen == 1;}); + // Try to get control of the queue a bunch of times + for (auto x = 0; x < 100 && !fails; ++x) { + fails = queue->ControlMutex.try_lock(); + } + // Unfreeze + FrozenCleanupCheck::nFrozen = 0; + } + // Awaken frozen destructor + FrozenCleanupCheck::cv.notify_one(); + // Wait for control to finish + t0.join(); + tg.interrupt_all(); + tg.join_all(); + BOOST_REQUIRE(!fails); +} + + +/** Test that CCheckQueueControl is threadsafe */ +BOOST_AUTO_TEST_CASE(test_CheckQueueControl_Locks) +{ + auto queue = std::unique_ptr(new Standard_Queue{QUEUE_BATCH_SIZE}); + { + boost::thread_group tg; + std::atomic nThreads {0}; + std::atomic fails {0}; + for (size_t i = 0; i < 3; ++i) { + tg.create_thread( + [&]{ + CCheckQueueControl control(queue.get()); + // While sleeping, no other thread should execute to this point + auto observed = ++nThreads; + MilliSleep(10); + fails += observed != nThreads; + }); + } + tg.join_all(); + BOOST_REQUIRE_EQUAL(fails, 0); + } + { + boost::thread_group tg; + std::mutex m; + bool has_lock {false}; + bool has_tried {false}; + bool done {false}; + bool done_ack {false}; + std::condition_variable cv; + { + std::unique_lock l(m); + tg.create_thread([&]{ + CCheckQueueControl control(queue.get()); + std::unique_lock l(m); + has_lock = true; + cv.notify_one(); + cv.wait(l, [&]{return has_tried;}); + done = true; + cv.notify_one(); + // Wait until the done is acknowledged + // + cv.wait(l, [&]{return done_ack;}); + }); + // Wait for thread to get the lock + cv.wait(l, [&](){return has_lock;}); + bool fails = false; + for (auto x = 0; x < 100 && !fails; ++x) { + fails = queue->ControlMutex.try_lock(); + } + has_tried = true; + cv.notify_one(); + cv.wait(l, [&](){return done;}); + // Acknowledge the done + done_ack = true; + cv.notify_one(); + BOOST_REQUIRE(!fails); + } + tg.join_all(); + } +} +BOOST_AUTO_TEST_SUITE_END() + -- cgit v1.2.3