Backport #71174 to 24.10: Maybe not GWPAsan by default

programs/server/Server.cpp

@@ -205,7 +205,6 @@ namespace ServerSetting
     extern const ServerSettingsBool format_alter_operations_with_parentheses;
     extern const ServerSettingsUInt64 global_profiler_cpu_time_period_ns;
     extern const ServerSettingsUInt64 global_profiler_real_time_period_ns;
-    extern const ServerSettingsDouble gwp_asan_force_sample_probability;
     extern const ServerSettingsUInt64 http_connections_soft_limit;
     extern const ServerSettingsUInt64 http_connections_store_limit;
     extern const ServerSettingsUInt64 http_connections_warn_limit;
@@ -620,7 +619,7 @@ void sanityChecks(Server & server)
 #if defined(OS_LINUX)
     try
     {
-        const std::unordered_set<std::string> fastClockSources = {
+        const std::unordered_set<std::string> fast_clock_sources = {
             // ARM clock
             "arch_sys_counter",
             // KVM guest clock
@@ -629,7 +628,7 @@ void sanityChecks(Server & server)
             "tsc",
         };
         const char * filename = "/sys/devices/system/clocksource/clocksource0/current_clocksource";
-        if (!fastClockSources.contains(readLine(filename)))
+        if (!fast_clock_sources.contains(readLine(filename)))
             server.context()->addWarningMessage("Linux is not using a fast clock source. Performance can be degraded. Check " + String(filename));
     }
     catch (...) // NOLINT(bugprone-empty-catch)
@@ -1927,10 +1926,6 @@ try
             if (global_context->isServerCompletelyStarted())
                 CannotAllocateThreadFaultInjector::setFaultProbability(new_server_settings[ServerSetting::cannot_allocate_thread_fault_injection_probability]);
 
-#if USE_GWP_ASAN
-            GWPAsan::setForceSampleProbability(new_server_settings[ServerSetting::gwp_asan_force_sample_probability]);
-#endif
-
             ProfileEvents::increment(ProfileEvents::MainConfigLoads);
 
             /// Must be the last.
@@ -2405,7 +2400,6 @@ try
 
 #if USE_GWP_ASAN
         GWPAsan::initFinished();
-        GWPAsan::setForceSampleProbability(server_settings[ServerSetting::gwp_asan_force_sample_probability]);
 #endif
 
         try

src/Common/GWPAsan.cpp

@@ -57,7 +57,7 @@ static bool guarded_alloc_initialized = []
         opts.MaxSimultaneousAllocations = 1024;
 
     if (!env_options_raw || !std::string_view{env_options_raw}.contains("SampleRate"))
-        opts.SampleRate = 10000;
+        opts.SampleRate = 0;
 
     const char * collect_stacktraces = std::getenv("GWP_ASAN_COLLECT_STACKTRACES"); // NOLINT(concurrency-mt-unsafe)
     if (collect_stacktraces && std::string_view{collect_stacktraces} == "1")

src/Common/GWPAsan.h

@@ -8,7 +8,6 @@
 #include <Common/thread_local_rng.h>
 
 #include <atomic>
-#include <random>
 
 namespace GWPAsan
 {
@@ -39,14 +38,6 @@ inline bool shouldSample()
     return init_finished.load(std::memory_order_relaxed) && GuardedAlloc.shouldSample();
 }
 
-inline bool shouldForceSample()
-{
-    if (!init_finished.load(std::memory_order_relaxed))
-        return false;
-    std::bernoulli_distribution dist(force_sample_probability.load(std::memory_order_relaxed));
-    return dist(thread_local_rng);
-}
-
 }
 
 #endif

src/Common/PODArray.h

@@ -115,11 +115,6 @@ protected:
     template <typename ... TAllocatorParams>
     void alloc(size_t bytes, TAllocatorParams &&... allocator_params)
     {
-#if USE_GWP_ASAN
-        if (unlikely(GWPAsan::shouldForceSample()))
-            gwp_asan::getThreadLocals()->NextSampleCounter = 1;
-#endif
-
         char * allocated = reinterpret_cast<char *>(TAllocator::alloc(bytes, std::forward<TAllocatorParams>(allocator_params)...));
 
         c_start = allocated + pad_left;
@@ -149,11 +144,6 @@ protected:
             return;
         }
 
-#if USE_GWP_ASAN
-        if (unlikely(GWPAsan::shouldForceSample()))
-            gwp_asan::getThreadLocals()->NextSampleCounter = 1;
-#endif
-
         unprotect();
 
         ptrdiff_t end_diff = c_end - c_start;

src/Core/ServerSettings.cpp

@@ -181,7 +181,6 @@ namespace DB
     DECLARE(String, merge_workload, "default", "Name of workload to be used to access resources for all merges (may be overridden by a merge tree setting)", 0) \
     DECLARE(String, mutation_workload, "default", "Name of workload to be used to access resources for all mutations (may be overridden by a merge tree setting)", 0) \
     DECLARE(Bool, prepare_system_log_tables_on_startup, false, "If true, ClickHouse creates all configured `system.*_log` tables before the startup. It can be helpful if some startup scripts depend on these tables.", 0) \
-    DECLARE(Double, gwp_asan_force_sample_probability, 0.0003, "Probability that an allocation from specific places will be sampled by GWP Asan (i.e. PODArray allocations)", 0) \
     DECLARE(UInt64, config_reload_interval_ms, 2000, "How often clickhouse will reload config and check for new changes", 0) \
     DECLARE(UInt64, memory_worker_period_ms, 0, "Tick period of background memory worker which corrects memory tracker memory usages and cleans up unused pages during higher memory usage. If set to 0, default value will be used depending on the memory usage source", 0) \
     DECLARE(Bool, disable_insertion_and_mutation, false, "Disable all insert/alter/delete queries. This setting will be enabled if someone needs read-only nodes to prevent insertion and mutation affect reading performance.", 0) \

src/IO/BufferWithOwnMemory.h

@@ -44,16 +44,10 @@ struct Memory : boost::noncopyable, Allocator
     char * m_data = nullptr;
     size_t alignment = 0;
 
-    [[maybe_unused]] bool allow_gwp_asan_force_sample{false};
-
     Memory() = default;
 
     /// If alignment != 0, then allocate memory aligned to specified value.
-    explicit Memory(size_t size_, size_t alignment_ = 0, bool allow_gwp_asan_force_sample_ = false)
+    explicit Memory(size_t size_, size_t alignment_ = 0) : alignment(alignment_) { alloc(size_); }
-        : alignment(alignment_), allow_gwp_asan_force_sample(allow_gwp_asan_force_sample_)
-    {
-        alloc(size_);
-    }
 
     ~Memory()
     {
@@ -133,11 +127,6 @@ private:
         ProfileEvents::increment(ProfileEvents::IOBufferAllocs);
         ProfileEvents::increment(ProfileEvents::IOBufferAllocBytes, new_capacity);
 
-#if USE_GWP_ASAN
-        if (unlikely(allow_gwp_asan_force_sample && GWPAsan::shouldForceSample()))
-            gwp_asan::getThreadLocals()->NextSampleCounter = 1;
-#endif
-
         m_data = static_cast<char *>(Allocator::alloc(new_capacity, alignment));
         m_capacity = new_capacity;
         m_size = new_size;
@@ -165,7 +154,7 @@ protected:
 public:
     /// If non-nullptr 'existing_memory' is passed, then buffer will not create its own memory and will use existing_memory without ownership.
     explicit BufferWithOwnMemory(size_t size = DBMS_DEFAULT_BUFFER_SIZE, char * existing_memory = nullptr, size_t alignment = 0)
-        : Base(nullptr, 0), memory(existing_memory ? 0 : size, alignment, /*allow_gwp_asan_force_sample_=*/true)
+        : Base(nullptr, 0), memory(existing_memory ? 0 : size, alignment)
     {
         Base::set(existing_memory ? existing_memory : memory.data(), size);
         Base::padded = !existing_memory;