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gdb 之 attach

news 2026/5/12 11:40:09

参考链接

https://cloud.tencent.com/developer/article/1521208

thread266setscheduler-locking step

(gdb)bt#0 facebook::velox::HdfsReadFile::pread (this=0x7f3670186010, offset=18513484, length=16305, buf=0x7f37651cf540,stats=0x7f3670192600)at/work/gluten/ep/build-velox/build/velox_ep/velox/connectors/hive/storage_adapters/hdfs/HdfsReadFile.cpp:168#1 0x00007f36d39af1ea in facebook::velox::ReadFile::preadv (this=0x7f3670186010, offset=18513484,buffers=std::vector of length73,capacity128={...},stats=0x7f3670192600)at/work/gluten/ep/build-velox/build/velox_ep/velox/common/file/File.cpp:84#2 0x00007f36d3e59837 in facebook::velox::dwio::common::ReadFileInputStream::read (this=0x7f36701b9980,buffers=std::vector of length73,capacity128={...},offset=4,logType=facebook::velox::dwio::common::MetricsLog::MetricsType::FILE)at/work/gluten/ep/build-velox/build/velox_ep/velox/dwio/common/InputStream.cpp:105#3 0x00007f36da96f918 in facebook::velox::dwio::common::DirectCoalescedLoad::loadData (this=0x7f3670194ce0, prefetch=true)at/work/gluten/ep/build-velox/build/velox_ep/velox/dwio/common/DirectBufferedInput.cpp:321#4 0x00007f36d39451af in facebook::velox::cache::CoalescedLoad::loadOrFuture (this=0x7f3670194ce0, wait=0x0,ssdSavable=true)at/work/gluten/ep/build-velox/build/velox_ep/velox/common/caching/AsyncDataCache.cpp:302#5 0x00007f36da96ee5c in operator() (__closure=0x7f36697e9800)at/work/gluten/ep/build-velox/build/velox_ep/velox/dwio/common/DirectBufferedInput.cpp:226#6 0x00007f36da970ed0 in folly::detail::function::call_<facebook::velox::dwio::common::DirectBufferedInput::readRegions(const std::vector<facebook::velox::dwio::common::LoadRequest*>&, bool, const std::vector<int>&)::<lambda()>, true, false, void>(folly::detail::function::Data &) (p=...) at /work/gluten/dev/vcpkg/vcpkg_installed/x64-linux-avx/include/folly/Function.h:341#7 0x00007f36db04f634 in folly::detail::function::FunctionTraits<void ()>::operator()() (this=0x7f36697e9800)at/work/dev/vcpkg/.vcpkg/buildtrees/folly/src/4.07.01.00-4ae9f6791f.clean/folly/Function.h:368#8 folly::catch_exception<folly::Function<void ()>&, void (&)(char const*) noexcept, char const*&, void>(folly::Function<void ()>&, void (&)(char const*) noexcept, char const*&) (c=<optimized out>, t=...)at/work/dev/vcpkg/.vcpkg/buildtrees/folly/src/4.07.01.00-4ae9f6791f.clean/folly/lang/Exception.h:290#9 folly::Executor::invokeCatchingExns<folly::Function<void()>>(charconst*,folly::Function<void()>)(f=...,p=0x7f36e17f9cd5"ThreadPoolExecutor: func")at/work/dev/vcpkg/.vcpkg/buildtrees/folly/src/4.07.01.00-4ae9f6791f.clean/folly/Executor.h:234#10 folly::ThreadPoolExecutor::runTask (this=0x7f3ad0311e00, thread=std::shared_ptr (count 6, weak 0) 0x7f36701c22c0,task=...)at/work/dev/vcpkg/.vcpkg/buildtrees/folly/src/4.07.01.00-4ae9f6791f.clean/folly/executors/ThreadPoolExecutor.cpp:142#11 0x00007f36db0454bb in operator() (__closure=0x7f3670185dd0)at/opt/rh/devtoolset-11/root/usr/include/c++/11/ext/atomicity.h:109

单步调试运行

参考链接：

https://comate.baidu.com/zh/page/2bsqn86weoh

thread266setscheduler-locking step# 让 GDB 不因 SIGSEGV 而停止(gdb)handle SIGSEGV nostop noprint pass

# 或完全忽略(gdb)handle SIGSEGV ignore handle SIGPIPE nostop noprint pass

统计 breakpoint 命中次数

commandscontinueend

(gdb)bt#0 hdfsRead (fs=<optimized out>, f=0x7f4bdf4b8350, buffer=0x7f4bdc05b83c, length=720900)at/build/source/hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfs/hdfs.c:1514#1 0x00007f4c66b6bf71 in facebook::velox::filesystems::arrow::io::internal::LibHdfsShim::Read (this=0x7f4c73f33560<facebook::velox::filesystems::arrow::io::internal::(anonymousnamespace)::libhdfs_shim>,fs=0x7f5062475510,file=0x7f4bdf4b8350,buffer=0x7f4bdc05b83c,length=720900)at/work/gluten/ep/build-velox/build/velox_ep/velox/external/hdfs/ArrowHdfsInternal.cpp:447#2 0x00007f4c66950de4 in facebook::velox::HdfsFile::read (this=0x7f4bdcb9e960, pos=0x7f4bdc05b83c"",length=720900)at/work/gluten/ep/build-velox/build/velox_ep/velox/connectors/hive/storage_adapters/hdfs/HdfsReadFile.cpp:57#3 0x00007f4c66951326 in facebook::velox::HdfsReadFile::Impl::preadInternal (this=0x7f4d081a1170, offset=4, length=1048576,pos=0x7f4bdc05b83c"")at/work/gluten/ep/build-velox/build/velox_ep/velox/connectors/hive/storage_adapters/hdfs/HdfsReadFile.cpp:100#4 0x00007f4c6695137a in facebook::velox::HdfsReadFile::Impl::pread (this=0x7f4d081a1170, offset=4, length=1048576,buf=0x7f4bdc00b840)at/work/gluten/ep/build-velox/build/velox_ep/velox/connectors/hive/storage_adapters/hdfs/HdfsReadFile.cpp:107#5 0x00007f4c66950871 in facebook::velox::HdfsReadFile::pread (this=0x7f4d08180920, offset=4, length=1048576,buf=0x7f4bdc00b840,stats=0x7f4d0818b550)at/work/gluten/ep/build-velox/build/velox_ep/velox/connectors/hive/storage_adapters/hdfs/HdfsReadFile.cpp:167#6 0x00007f4c639af1ea in facebook::velox::ReadFile::preadv (this=0x7f4d08180920, offset=4,buffers=std::vector of length73,capacity128={...},stats=0x7f4d0818b550)at/work/gluten/ep/build-velox/build/velox_ep/velox/common/file/File.cpp:84#7 0x00007f4c63e59837 in facebook::velox::dwio::common::ReadFileInputStream::read (this=0x7f4d081a1af0,buffers=std::vector of length73,capacity128={...},offset=4,logType=facebook::velox::dwio::common::MetricsLog::MetricsType::FILE)at/work/gluten/ep/build-velox/build/velox_ep/velox/dwio/common/InputStream.cpp:105#8 0x00007f4c6a96f918 in facebook::velox::dwio::common::DirectCoalescedLoad::loadData (this=0x7f4d0818dc30, prefetch=true)at/work/gluten/ep/build-velox/build/velox_ep/velox/dwio/common/DirectBufferedInput.cpp:321#9 0x00007f4c639451af in facebook::velox::cache::CoalescedLoad::loadOrFuture (this=0x7f4d0818dc30, wait=0x0, ssdSavable=true)at/work/gluten/ep/build-velox/build/velox_ep/velox/common/caching/AsyncDataCache.cpp:302#10 0x00007f4c6a96ee5c in operator() (__closure=0x7f4bf8be5800)at/work/gluten/ep/build-velox/build/velox_ep/velox/dwio/common/DirectBufferedInput.cpp:226

案例

1472/** 1473 * If the underlying stream supports the ByteBufferReadable interface then 1474 * this method will transparently use read(ByteBuffer). This can help 1475 * improve performance as it avoids unnecessarily copying data on to the Java 1476 * heap. Instead the data will be directly copied from kernel space to the C 1477 * heap. 1478 */1479tSizehdfsRead(hdfsFSfs,hdfsFilef,void*buffer,tSizelength)1480{1481jobjectjInputStream;1482jbyteArrayjbRarray;1483jvaluejVal;1484jthrowablejthr;1485JNIEnv*env;14861487if(length==0){1488return0;1489}elseif(length<0){1490errno=EINVAL;1491return-1;1492}1493if(f->flags&HDFS_FILE_SUPPORTS_DIRECT_READ){1494returnreadDirect(fs,f,buffer,length);1495}

1508//Parameters1509if(readPrepare(env,fs,f,&jInputStream)==-1){1510return-1;1511}15121513//Read the requisite bytes1514jbRarray=(*env)->NewByteArray(env,length);1515if(!jbRarray){1516errno=printPendingExceptionAndFree(env,PRINT_EXC_ALL,1517"hdfsRead: NewByteArray");1518return-1;1519}