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Fix scope of `ReadOptions` in `SstFileReader` (#7432) 

Summary:
a4a4a2dabd changed the contract of `TableReader::NewIterator()` to require
`ReadOptions` outlive the returned iterator. But I didn't notice that
`SstFileReader` violates the new contract and needs to be adapted. The unit test
provided here exposes the problem when run under ASAN.

```
$ ./sst_file_reader_test --gtest_filter=SstFileReaderTest.ReadOptionsOutOfScope
Note: Google Test filter = SstFileReaderTest.ReadOptionsOutOfScope
[==========] Running 1 test from 1 test case.
[----------] Global test environment set-up.
[----------] 1 test from SstFileReaderTest
[ RUN      ] SstFileReaderTest.ReadOptionsOutOfScope
=================================================================
==3238048==ERROR: AddressSanitizer: stack-use-after-scope on address 0x7ffd6189e158 at pc 0x000001298350 bp 0x7ffd6189c280 sp 0x7ffd6189c278
READ of size 8 at 0x7ffd6189e158 thread T0
    #0 0x129834f in rocksdb::BlockBasedTableIterator::InitDataBlock() table/block_based/block_based_table_iterator.cc:236
    https://github.com/facebook/rocksdb/issues/1 0x12b01f7 in rocksdb::BlockBasedTableIterator::SeekImpl(rocksdb::Slice const*) table/block_based/block_based_table_iterator.cc:77
    https://github.com/facebook/rocksdb/issues/2 0x844d28 in rocksdb::IteratorWrapperBase<rocksdb::Slice>::SeekToFirst() table/iterator_wrapper.h:116
    https://github.com/facebook/rocksdb/issues/3 0x844d28 in rocksdb::DBIter::SeekToFirst() db/db_iter.cc:1352
    https://github.com/facebook/rocksdb/issues/4 0x52482b in rocksdb::SstFileReaderTest_ReadOptionsOutOfScope_Test::TestBody() table/sst_file_reader_test.cc:150
    https://github.com/facebook/rocksdb/issues/5 0x5f433c in void testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) third-party/gtest-1.8.1/fused-src/gtest/gtest-all.cc:3899
    https://github.com/facebook/rocksdb/issues/6 0x5f433c in void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) third-party/gtest-1.8.1/fused-src/gtest/gtest-all.cc:3935
    https://github.com/facebook/rocksdb/issues/7 0x5cc2de in testing::Test::Run() third-party/gtest-1.8.1/fused-src/gtest/gtest-all.cc:3973
    https://github.com/facebook/rocksdb/issues/8 0x5cc988 in testing::Test::Run() third-party/gtest-1.8.1/fused-src/gtest/gtest-all.cc:3965
    https://github.com/facebook/rocksdb/issues/9 0x5cc988 in testing::TestInfo::Run() third-party/gtest-1.8.1/fused-src/gtest/gtest-all.cc:4149
    https://github.com/facebook/rocksdb/issues/10 0x5cce9a in testing::TestInfo::Run() third-party/gtest-1.8.1/fused-src/gtest/gtest-all.cc:4124
    https://github.com/facebook/rocksdb/issues/11 0x5cce9a in testing::TestCase::Run() third-party/gtest-1.8.1/fused-src/gtest/gtest-all.cc:4267
    https://github.com/facebook/rocksdb/issues/12 0x5ce696 in testing::TestCase::Run() third-party/gtest-1.8.1/fused-src/gtest/gtest-all.cc:4253
    https://github.com/facebook/rocksdb/issues/13 0x5ce696 in testing::internal::UnitTestImpl::RunAllTests() third-party/gtest-1.8.1/fused-src/gtest/gtest-all.cc:6633
    https://github.com/facebook/rocksdb/issues/14 0x5f541c in bool testing::internal::HandleSehExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*) third-party/gtest-1.8.1/fused-src/gtest/gtest-all.cc:3899
    https://github.com/facebook/rocksdb/issues/15 0x5f541c in bool testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*) third-party/gtest-1.8.1/fused-src/gtest/gtest-all.cc:3935
    https://github.com/facebook/rocksdb/issues/16 0x5cee74 in testing::UnitTest::Run() third-party/gtest-1.8.1/fused-src/gtest/gtest-all.cc:6242
    https://github.com/facebook/rocksdb/issues/17 0x4c0332 in RUN_ALL_TESTS() third-party/gtest-1.8.1/fused-src/gtest/gtest.h:22104
    https://github.com/facebook/rocksdb/issues/18 0x4c0332 in main table/sst_file_reader_test.cc:213
    https://github.com/facebook/rocksdb/issues/19 0x7fb0263281a5 in __libc_start_main (/usr/local/fbcode/platform007/lib/libc.so.6+0x211a5)
    https://github.com/facebook/rocksdb/issues/20 0x523e56  (/data/users/andrewkr/rocksdb/sst_file_reader_test+0x523e56)

Address 0x7ffd6189e158 is located in stack of thread T0 at offset 568 in frame
    #0 0x52428f in rocksdb::SstFileReaderTest_ReadOptionsOutOfScope_Test::TestBody() table/sst_file_reader_test.cc:131

  This frame has 9 object(s):
    [32, 40) 'reader'
    [96, 104) '<unknown>'
    [160, 168) '<unknown>'
    [224, 232) 'iter'
    [288, 304) 'gtest_ar'
    [352, 368) '<unknown>'
    [416, 440) 'keys'
    [480, 512) '<unknown>'
    [544, 680) 'ropts' <== Memory access at offset 568 is inside this variable
HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext
      (longjmp and C++ exceptions *are* supported)
 AddressSanitizer: stack-use-after-scope table/block_based/block_based_table_iterator.cc:236 in rocksdb::BlockBasedTableIterator::InitDataBlock()
...
```

The fix is to use `ArenaWrappedDBIter` which has support for holding a
`ReadOptions` in an `Arena` whose lifetime is tied to the iterator.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7432

Test Plan: verified the provided unit test no longer fails

Reviewed By: pdillinger

Differential Revision: D23880043

Pulled By: ajkr

fbshipit-source-id: 9464c37408f7bd7c9c4a90ceffb04d9f0ca7a494
This commit is contained in:
Andrew Kryczka 2020-09-23 15:22:35 -07:00 committed by Facebook GitHub Bot
parent 6980fff445
commit 0698598f3a
2 changed files with 40 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
table/sst_file_reader.cc
View File

@ -7,6 +7,7 @@
#include "rocksdb/sst_file_reader.h"
#include "db/arena_wrapped_db_iter.h"
#include "db/db_iter.h"
#include "db/dbformat.h"
#include "env/composite_env_wrapper.h"
@ -62,18 +63,23 @@ Status SstFileReader::Open(const std::string& file_path) {
return s;
}
Iterator* SstFileReader::NewIterator(const ReadOptions& options) {
Iterator* SstFileReader::NewIterator(const ReadOptions& roptions) {
auto r = rep_.get();
auto sequence = options.snapshot != nullptr
? options.snapshot->GetSequenceNumber()
auto sequence = roptions.snapshot != nullptr
? roptions.snapshot->GetSequenceNumber()
: kMaxSequenceNumber;
ArenaWrappedDBIter* res = new ArenaWrappedDBIter();
res->Init(r->options.env, roptions, r->ioptions, r->moptions, sequence,
r->moptions.max_sequential_skip_in_iterations,
0 /* version_number */, nullptr /* read_callback */,
nullptr /* db_impl */, nullptr /* cfd */, false /* allow_blob */,
false /* allow_refresh */);
auto internal_iter = r->table_reader->NewIterator(
options, r->moptions.prefix_extractor.get(), /*arena=*/nullptr,
/*skip_filters=*/false, TableReaderCaller::kSSTFileReader);
return NewDBIterator(r->options.env, options, r->ioptions, r->moptions,
r->ioptions.user_comparator, internal_iter, sequence,
r->moptions.max_sequential_skip_in_iterations,
nullptr /* read_callback */);
res->GetReadOptions(), r->moptions.prefix_extractor.get(),
res->GetArena(), false /* skip_filters */,
TableReaderCaller::kSSTFileReader);
res->SetIterUnderDBIter(internal_iter);
return res;
}
std::shared_ptr<const TableProperties> SstFileReader::GetTableProperties()

25
table/sst_file_reader_test.cc
View File

@ -128,6 +128,31 @@ TEST_F(SstFileReaderTest, Uint64Comparator) {
CreateFileAndCheck(keys);
}
TEST_F(SstFileReaderTest, ReadOptionsOutOfScope) {
// Repro a bug where the SstFileReader depended on its configured ReadOptions
// outliving it.
options_.comparator = test::Uint64Comparator();
std::vector<std::string> keys;
for (uint64_t i = 0; i < kNumKeys; i++) {
keys.emplace_back(EncodeAsUint64(i));
}
CreateFile(sst_name_, keys);
SstFileReader reader(options_);
ASSERT_OK(reader.Open(sst_name_));
std::unique_ptr<Iterator> iter;
{
// Make sure ReadOptions go out of scope ASAP so we know the iterator
// operations do not depend on it.
ReadOptions ropts;
iter.reset(reader.NewIterator(ropts));
}
iter->SeekToFirst();
while (iter->Valid()) {
iter->Next();
}
}
TEST_F(SstFileReaderTest, ReadFileWithGlobalSeqno) {
std::vector<std::string> keys;
for (uint64_t i = 0; i < kNumKeys; i++) {