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2020-10-23Rewrite reference leak checker without finalizers.Dean Deng
Our current reference leak checker uses finalizers to verify whether an object has reached zero references before it is garbage collected. There are multiple problems with this mechanism, so a rewrite is in order. With finalizers, there is no way to guarantee that a finalizer will run before the program exits. When an unreachable object with a finalizer is garbage collected, its finalizer will be added to a queue and run asynchronously. The best we can do is run garbage collection upon sandbox exit to make sure that all finalizers are enqueued. Furthermore, if there is a chain of finalized objects, e.g. A points to B points to C, garbage collection needs to run multiple times before all of the finalizers are enqueued. The first GC run will register the finalizer for A but not free it. It takes another GC run to free A, at which point B's finalizer can be registered. As a result, we need to run GC as many times as the length of the longest such chain to have a somewhat reliable leak checker. Finally, a cyclical chain of structs pointing to one another will never be garbage collected if a finalizer is set. This is a well-known issue with Go finalizers (https://github.com/golang/go/issues/7358). Using leak checking on filesystem objects that produce cycles will not work and even result in memory leaks. The new leak checker stores reference counted objects in a global map when leak check is enabled and removes them once they are destroyed. At sandbox exit, any remaining objects in the map are considered as leaked. This provides a deterministic way of detecting leaks without relying on the complexities of finalizers and garbage collection. This approach has several benefits over the former, including: - Always detects leaks of objects that should be destroyed very close to sandbox exit. The old checker very rarely detected these leaks, because it relied on garbage collection to be run in a short window of time. - Panics if we forgot to enable leak check on a ref-counted object (we will try to remove it from the map when it is destroyed, but it will never have been added). - Can store extra logging information in the map values without adding to the size of the ref count struct itself. With the size of just an int64, the ref count object remains compact, meaning frequent operations like IncRef/DecRef are more cache-efficient. - Can aggregate leak results in a single report after the sandbox exits. Instead of having warnings littered in the log, which were non-deterministically triggered by garbage collection, we can print all warning messages at once. Note that this could also be a limitation--the sandbox must exit properly for leaks to be detected. Some basic benchmarking indicates that this change does not significantly affect performance when leak checking is enabled, which is understandable since registering/unregistering is only done once for each filesystem object. Updates #1486. PiperOrigin-RevId: 338685972
2020-10-14Disable strace+debug when explicitly requestedTiwei Bie
Currently strace+debug is always enabled as the setting from the upper layer isn't passed to _syscall_test(). And it will negatively affect the performance tests. This patch fixes this issue. The "debug" argument of _syscall_test() is also made mandatory to prevent this happening again. //test/perf:getpid_benchmark_runsc_kvm ----------------------------------------------------- Benchmark Time CPU Iterations ----------------------------------------------------- Before: BM_Getpid 28119 ns 28157 ns 25926 After: BM_Getpid 947 ns 939 ns 777778 Fixes #4509 Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
2020-10-12gvisor/test: Set nogotsan for native testsAndrei Vagin
Tests are written in C++ and there is no reason to run them with gotsan without gVisor. PiperOrigin-RevId: 336783276
2020-10-05Enable more VFS2 testsFabricio Voznika
Updates #1487 PiperOrigin-RevId: 335516732
2020-08-31Run syscall tests in uts namespaces.Rahat Mahmood
Some syscall tests, namely uname_test_* modify the host and domain name, which modifies the execution environment and can have unintended consequences on other tests. For example, modifying the hostname causes some networking tests to fail DNS lookups. Run all syscall tests in their own uts namespaces to isolate these changes. PiperOrigin-RevId: 329348127
2020-08-20Enable strace+debug in syscall testsFabricio Voznika
This is done to ease troubleshooting when tests fail. runsc logs are not stored when tests passe, so this will only affect failing tests and should not increase log storage too badly. PiperOrigin-RevId: 327717551
2020-08-12Merge pull request #3250 from craig08:fuse-getattrgVisor bot
PiperOrigin-RevId: 326313858
2020-08-12Limit the scope when deleting test log directory on successFabricio Voznika
The code was deleting logs for all tests when a single test passed. Change it to delete only the logs relevant to the test at hand. Also fixed the benchmark lookup code, which was always generating a single empty benchmark entry if there were not benchmarks. PiperOrigin-RevId: 326311477
2020-08-10Implement FUSE_GETATTRCraig Chi
FUSE_GETATTR is called when a stat(2), fstat(2), or lstat(2) is issued from VFS2 layer to a FUSE filesystem. Fixes #3175
2020-08-10Enable VFS2 by default for all syscall tests.Ayush Ranjan
Fixes #2923 PiperOrigin-RevId: 325904734
2020-08-06Add bzl_library rules for .bzl files without one.Adin Scannell
PiperOrigin-RevId: 325280924
2020-08-04Add FUSE integration testCraig Chi
This commit adds an integration test framework for FUSE support. Please refer to the test example and test/fuse/README.md for further details. Fixes #3098
2020-07-27Merge pull request #3377 from kevinGC:native-tagsgVisor bot
PiperOrigin-RevId: 323398518
2020-07-25test/syscall: run each test case in a separate network namespaceAndrei Vagin
... when it is possible. The guitar gVisorKernel*Workflow-s runs test with the local execution_method. In this case, blaze runs test cases locally without sandboxes. This means that all tests run in the same network namespace. We have a few tests which use hard-coded network ports and they can fail if one of these port will be used by someone else or by another test cases. PiperOrigin-RevId: 323137254
2020-07-24Bugfix: non-native tests were tagged as nativeKevin Krakauer
Copy the list of tags when passing it to _syscall_test.
2020-07-15Merge pull request #3165 from ridwanmsharif:ridwanmsharif/fuse-off-by-defaultgVisor bot
PiperOrigin-RevId: 321411758
2020-07-13Merge pull request #2672 from amscanne:shim-integratedgVisor bot
PiperOrigin-RevId: 321053634
2020-07-09Gate FUSE behind a runsc flagRidwan Sharif
This change gates all FUSE commands (by gating /dev/fuse) behind a runsc flag. In order to use FUSE commands, use the --fuse flag with the --vfs2 flag. Check if FUSE is enabled by running dmesg in the sandbox.
2020-06-19Use internal tmpfs in test runner, even when running with overlay.Nicolas Lacasse
PiperOrigin-RevId: 317377571
2020-06-17Remove various uses of 'blacklist'Michael Pratt
Updates #2972 PiperOrigin-RevId: 316942245
2020-06-15Correctly set the test VFS environment variable.Rahat Mahmood
Also fix test bugs uncovered now that they aren't silently skipped on VFS2. Updates #1487. PiperOrigin-RevId: 316415807
2020-06-11Remove generated logs when test succeeds.Adin Scannell
PiperOrigin-RevId: 316022884
2020-06-04test/syscall: run hostnet tests in separate network namespacesAndrei Vagin
A few tests use hard coded port numbers, so we need to guruantee that these ports will not be used for somthing else.
2020-06-01Enable VFS2 to runsc syscall testsFabricio Voznika
Updates #1487 PiperOrigin-RevId: 314271995
2020-05-29runner: fix goroutine leakGaurav Singh
Signed-off-by: Gaurav Singh <gaurav1086@gmail.com>
2020-05-21Fix IsRunningWithVFS1() on the runsc-based test runner.Jamie Liu
Updates #1035 PiperOrigin-RevId: 312736450
2020-04-23Simplify Docker test infrastructure.Adin Scannell
This change adds a layer of abstraction around the internal Docker APIs, and eliminates all direct dependencies on Dockerfiles in the infrastructure. A subsequent change will automated the generation of local images (with efficient caching). Note that this change drops the use of bazel container rules, as that experiment does not seem to be viable. PiperOrigin-RevId: 308095430
2020-04-21Internal change.gVisor bot
PiperOrigin-RevId: 307622320
2020-03-20test: Create a separate /tmp mount only for tests with the shared tagAndrei Vagin
The root mount is not shared by default, but all other mounts are shared. So if we create the /tmp mount, this means that we run tests on a shared mount even if tests run without the --shared option. PiperOrigin-RevId: 302130790
2020-03-04test/runner: use proper filters for test casesAndrei Vagin
The benchmark_filter options accepts regex-s, but the gtest-filter option accepts shell-like wildcards. Fixes #2034 Signed-off-by: Andrei Vagin <avagin@gmail.com>
2020-02-24Add default behavior for gtest runner.Adin Scannell
PiperOrigin-RevId: 297009116
2020-02-21Factor platform tags.Adin Scannell
PiperOrigin-RevId: 296519566
2020-02-19Add basic microbenchmarks.Adin Scannell
PiperOrigin-RevId: 296104390
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