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WIKI Figure for https://github.com/facebook/rocksdb/wiki/Rate-Limiter
hx235
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Mar 22, 2022
…n opening Posix WritableFile (facebook#9685) Summary: Pull Request resolved: facebook#9685 Our TSAN reports a race condition as follows when running test ``` gtest-parallel -r 100 ./external_sst_file_test --gtest_filter=ExternalSSTFileTest.MultiThreaded ``` leads to the following ``` WARNING: ThreadSanitizer: data race (pid=2683148) Write of size 1 at 0x556fede63340 by thread T7: #0 rocksdb::(anonymous namespace)::PosixFileSystem::OpenWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, rocksdb::FileOptions const&, bool, std::unique_ptr<rocksdb::FSWritableFile, std::default_delete<rocksdb::FSWritableFile> >*, rocksdb::IODebugContext*) internal_repo_rocksdb/repo/env/fs_posix.cc:334 (external_sst_file_test+0xb61ac4) #1 rocksdb::(anonymous namespace)::PosixFileSystem::ReopenWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, rocksdb::FileOptions const&, std::unique_ptr<rocksdb::FSWritableFile, std::default_delete<rocksdb::FSWritableFile> >*, rocksdb::IODebugContext*) internal_repo_rocksdb/repo/env/fs_posix.cc:382 (external_sst_file_test+0xb5ba96) facebook#2 rocksdb::CompositeEnv::ReopenWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::unique_ptr<rocksdb::WritableFile, std::default_delete<rocksdb::WritableFile> >*, rocksdb::EnvOptions const&) internal_repo_rocksdb/repo/env/composite_env.cc:334 (external_sst_file_test+0xa6ab7f) facebook#3 rocksdb::EnvWrapper::ReopenWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::unique_ptr<rocksdb::WritableFile, std::default_delete<rocksdb::WritableFile> >*, rocksdb::EnvOptions const&) internal_repo_rocksdb/repo/include/rocksdb/env.h:1428 (external_sst_file_test+0x561f3e) Previous read of size 1 at 0x556fede63340 by thread T4: #0 rocksdb::(anonymous namespace)::PosixFileSystem::OpenWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, rocksdb::FileOptions const&, bool, std::unique_ptr<rocksdb::FSWritableFile, std::default_delete<rocksdb::FSWritableFile> >*, rocksdb::IODebugContext*) internal_repo_rocksdb/repo/env/fs_posix.cc:328 (external_sst_file_test+0xb61a70) #1 rocksdb::(anonymous namespace)::PosixFileSystem::ReopenWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator ... ``` Fix by making sure the following block gets executed only once: ``` if (!checkedDiskForMmap_) { // this will be executed once in the program's lifetime. // do not use mmapWrite on non ext-3/xfs/tmpfs systems. if (!SupportsFastAllocate(fname)) { forceMmapOff_ = true; } checkedDiskForMmap_ = true; } ``` Reviewed By: pdillinger Differential Revision: D34780308 fbshipit-source-id: b761f66b24c8b5b8389d86ea371c8542b8d869d5
hx235
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Apr 19, 2022
…n opening Posix WritableFile (facebook#9685) Summary: Pull Request resolved: facebook#9685 Our TSAN reports a race condition as follows when running test ``` gtest-parallel -r 100 ./external_sst_file_test --gtest_filter=ExternalSSTFileTest.MultiThreaded ``` leads to the following ``` WARNING: ThreadSanitizer: data race (pid=2683148) Write of size 1 at 0x556fede63340 by thread T7: #0 rocksdb::(anonymous namespace)::PosixFileSystem::OpenWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, rocksdb::FileOptions const&, bool, std::unique_ptr<rocksdb::FSWritableFile, std::default_delete<rocksdb::FSWritableFile> >*, rocksdb::IODebugContext*) internal_repo_rocksdb/repo/env/fs_posix.cc:334 (external_sst_file_test+0xb61ac4) #1 rocksdb::(anonymous namespace)::PosixFileSystem::ReopenWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, rocksdb::FileOptions const&, std::unique_ptr<rocksdb::FSWritableFile, std::default_delete<rocksdb::FSWritableFile> >*, rocksdb::IODebugContext*) internal_repo_rocksdb/repo/env/fs_posix.cc:382 (external_sst_file_test+0xb5ba96) facebook#2 rocksdb::CompositeEnv::ReopenWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::unique_ptr<rocksdb::WritableFile, std::default_delete<rocksdb::WritableFile> >*, rocksdb::EnvOptions const&) internal_repo_rocksdb/repo/env/composite_env.cc:334 (external_sst_file_test+0xa6ab7f) facebook#3 rocksdb::EnvWrapper::ReopenWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::unique_ptr<rocksdb::WritableFile, std::default_delete<rocksdb::WritableFile> >*, rocksdb::EnvOptions const&) internal_repo_rocksdb/repo/include/rocksdb/env.h:1428 (external_sst_file_test+0x561f3e) Previous read of size 1 at 0x556fede63340 by thread T4: #0 rocksdb::(anonymous namespace)::PosixFileSystem::OpenWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, rocksdb::FileOptions const&, bool, std::unique_ptr<rocksdb::FSWritableFile, std::default_delete<rocksdb::FSWritableFile> >*, rocksdb::IODebugContext*) internal_repo_rocksdb/repo/env/fs_posix.cc:328 (external_sst_file_test+0xb61a70) #1 rocksdb::(anonymous namespace)::PosixFileSystem::ReopenWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator ... ``` Fix by making sure the following block gets executed only once: ``` if (!checkedDiskForMmap_) { // this will be executed once in the program's lifetime. // do not use mmapWrite on non ext-3/xfs/tmpfs systems. if (!SupportsFastAllocate(fname)) { forceMmapOff_ = true; } checkedDiskForMmap_ = true; } ``` Reviewed By: pdillinger Differential Revision: D34780308 fbshipit-source-id: b761f66b24c8b5b8389d86ea371c8542b8d869d5
hx235
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Nov 29, 2023
Summary: I must have chosen trimming before frame 8 based on assertion failures, but that trims too many frame for a general segfault. So this changes to start printing at frame 4, as in this example where I've seeded a null deref: ``` Received signal 11 (Segmentation fault) Invoking LLDB for stack trace... Process 873208 stopped * thread #1, name = 'db_stress', stop reason = signal SIGSTOP frame #0: 0x00007fb1fe8f1033 libc.so.6`__GI___wait4(pid=873478, stat_loc=0x00007fb1fb114030, options=0, usage=0x0000000000000000) at wait4.c:30:10 thread facebook#2, name = 'rocksdb:low', stop reason = signal SIGSTOP frame #0: 0x00007fb1fe8972a1 libc.so.6`__GI___futex_abstimed_wait_cancelable64 at futex-internal.c:57:12 Executable module set to "/data/users/peterd/rocksdb/db_stress". Architecture set to: x86_64-unknown-linux-gnu. True frame facebook#4: 0x00007fb1fe844540 libc.so.6`__restore_rt at libc_sigaction.c:13 frame facebook#5: 0x0000000000608514 db_stress`rocksdb::StressTest::InitDb(rocksdb::SharedState*) at db_stress_test_base.cc:345:18 frame facebook#6: 0x0000000000585d62 db_stress`rocksdb::RunStressTestImpl(rocksdb::SharedState*) at db_stress_driver.cc:84:17 frame facebook#7: 0x000000000058dd69 db_stress`rocksdb::RunStressTest(shared=0x00006120000001c0) at db_stress_driver.cc:266:34 frame facebook#8: 0x0000000000453b34 db_stress`rocksdb::db_stress_tool(int, char**) at db_stress_tool.cc:370:20 ... ``` Pull Request resolved: facebook#12101 Test Plan: manual (see above) Reviewed By: ajkr Differential Revision: D51593217 Pulled By: pdillinger fbshipit-source-id: 4a71eb8e516edbc32e682f9537bc77d073a7b4ed
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WIKI Figure for https://github.com/facebook/rocksdb/wiki/Rate-Limiter