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kubamracek (Kuba (Brecka) Mracek)
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User Since
Jun 3 2014, 6:35 AM (250 w, 4 d)

Recent Activity

Tue, Mar 19

kubamracek added a comment to D59526: [TSan][libdispatch] Avoid infinite recursion in dispatch_apply[_f] interceptors.

Also, I assume this is already covered by a test?

Tue, Mar 19, 6:50 AM · Restricted Project, Restricted Project
kubamracek accepted D59526: [TSan][libdispatch] Avoid infinite recursion in dispatch_apply[_f] interceptors.

Looks good, thanks.

Tue, Mar 19, 6:50 AM · Restricted Project, Restricted Project

Mon, Mar 18

kubamracek accepted D59510: [NFC][TSan][libdispatch] Fix test for dispatch_apply[_f].

Make size just "2" to make sure we're actually able to satisfy the barrier on low-end machines. Other that that, LGTM.

Mon, Mar 18, 2:12 PM · Restricted Project, Restricted Project

Fri, Mar 15

kubamracek accepted D59429: [CMake] Fix broken uses of `try_compile_only()` and improve the function..
Fri, Mar 15, 1:11 PM · Restricted Project, Restricted Project

Thu, Mar 14

kubamracek accepted D59341: [NFC][TSan] Move libdispatch tests into their own subfolder.

Looks good, but I assume this needs the other patches to land first, right?

Thu, Mar 14, 1:14 PM · Restricted Project, Restricted Project
kubamracek added a comment to D59334: [TSan][libdispatch] Enable linking and running of tests on Linux.

This looks fine to me, but I think we need @dvyukov to sign off on this.

Thu, Mar 14, 1:12 PM · Restricted Project, Restricted Project
kubamracek accepted D59145: [TSan][libdispatch] Remove dependency on system headers.

Looks good, with a nit (feel free to address it separately).

Thu, Mar 14, 1:10 PM · Restricted Project, Restricted Project

Wed, Feb 27

kubamracek accepted D58310: [Darwin][NFC] Refactor throttling of 64bit sanitizer tests on Darwin.
Wed, Feb 27, 10:15 AM · Restricted Project, Restricted Project

Feb 20 2019

kubamracek accepted D58110: Support fiber API on macOS.
Feb 20 2019, 7:12 AM · Restricted Project, Restricted Project

Feb 18 2019

kubamracek added a comment to D58110: Support fiber API on macOS.

watchOS/tvOS build is broken right now in trunk:
https://pastebin.com/Y3gsxtA7

Feb 18 2019, 11:13 AM · Restricted Project, Restricted Project

Feb 14 2019

kubamracek added a comment to D58110: Support fiber API on macOS.

For the pragma diagnostic push/ignore stuff, we might be better off just redeclaring the function ourselves without including ucontext.h.

For tsan_interceptors_mac.cc it can be done. For me such solution is more ugly than usage of #define and #pragma; but if you insist on it, I can do such change.

Feb 14 2019, 10:57 AM · Restricted Project, Restricted Project

Feb 13 2019

kubamracek added a comment to D58110: Support fiber API on macOS.

@yln Could you take a look? Do the tests actually pass on Darwin?

Feb 13 2019, 9:33 AM · Restricted Project, Restricted Project
kubamracek added a reviewer for D58110: Support fiber API on macOS: yln.
Feb 13 2019, 9:19 AM · Restricted Project, Restricted Project

Feb 11 2019

kubamracek added a reviewer for D56485: Always compare C++ typeinfo (based on libstdc++ implementation).: vsk.
Feb 11 2019, 11:19 AM

Feb 6 2019

kubamracek closed D56221: [lldb] Make frame recognizers vend synthesized eValueTypeVariableArgument values.

Landed in r353363.

Feb 6 2019, 5:54 PM · Restricted Project
kubamracek committed rG92369dcffd7e: [lldb] Make frame recognizers vend synthesized eValueTypeVariableArgument values (authored by kubamracek).
[lldb] Make frame recognizers vend synthesized eValueTypeVariableArgument values
Feb 6 2019, 5:50 PM

Jan 27 2019

Herald added a reviewer for D56221: [lldb] Make frame recognizers vend synthesized eValueTypeVariableArgument values: serge-sans-paille.

Ping.

Jan 27 2019, 8:00 PM · Restricted Project

Jan 3 2019

kubamracek added a comment to D56115: [lldb] Check SafeToCallFunctions before calling functions in GetExceptionObjectForThread.

I recently started writing these early-exit returns as return {};

Good suggestion!

Jan 3 2019, 4:27 PM · Restricted Project

Jan 2 2019

kubamracek created D56221: [lldb] Make frame recognizers vend synthesized eValueTypeVariableArgument values.
Jan 2 2019, 1:47 PM · Restricted Project
kubamracek added a comment to D56207: Update allocator unit tests to test the `RemoteAddressSpaceView` template instantiation..

This needs https://reviews.llvm.org/D56206 to land first, right?

Jan 2 2019, 11:27 AM

Dec 27 2018

kubamracek created D56115: [lldb] Check SafeToCallFunctions before calling functions in GetExceptionObjectForThread.
Dec 27 2018, 3:30 PM · Restricted Project

Dec 21 2018

kubamracek created D56027: [lldb] Fix ObjCExceptionRecognizedStackFrame to populate the list of recognized arguments.
Dec 21 2018, 2:42 PM · Restricted Project

Dec 20 2018

kubamracek added a comment to D55959: [TSan] Enable detection of lock-order-inversions for Objective-C @synchronized.

LGTM with a nit. @dvyukov are we using the Mutex* calls correctly here?

Dec 20 2018, 3:18 PM · Restricted Project
kubamracek updated the diff for D55954: [lldb] Add a "display-recognized-arguments" target setting to show recognized arguments by default.

Adding test.

Dec 20 2018, 3:06 PM · Restricted Project
kubamracek created D55954: [lldb] Add a "display-recognized-arguments" target setting to show recognized arguments by default.
Dec 20 2018, 1:49 PM · Restricted Project

Dec 19 2018

kubamracek added a comment to D44072: [lldb] Retrieve currently handled Obj-C exception via __cxa_current_exception_type and add GetCurrentExceptionBacktrace SB ABI.

Thanks for the review! Switched to self.assertFalse and self.assertTrue and landed in r349718.

Dec 19 2018, 6:05 PM
kubamracek updated the diff for D44072: [lldb] Retrieve currently handled Obj-C exception via __cxa_current_exception_type and add GetCurrentExceptionBacktrace SB ABI.

Addressed comment 2. Changed the test to use an Obj-C++ source file, and added a case that throws a plain C++ exception.

Dec 19 2018, 4:19 PM
kubamracek updated the diff for D44072: [lldb] Retrieve currently handled Obj-C exception via __cxa_current_exception_type and add GetCurrentExceptionBacktrace SB ABI.

Addressing comment 1 (checking that GetCurrentException and GetCurrentExceptionBacktrace returns nothing when there's no exception in flights). Will address comment 2 in a bit.

Dec 19 2018, 1:36 PM

Dec 18 2018

kubamracek updated the diff for D55794: [asan] In llvm.asan.globals, allow entries to be non-GlobalVariable and skip over them.
Dec 18 2018, 12:31 PM · Restricted Project
kubamracek updated the diff for D55794: [asan] In llvm.asan.globals, allow entries to be non-GlobalVariable and skip over them.
Dec 18 2018, 12:04 PM · Restricted Project
kubamracek added a comment to D55794: [asan] In llvm.asan.globals, allow entries to be non-GlobalVariable and skip over them.

I see, you're probably right. The reason why I suggested to skip entries with bitcasts was because the cases where I hit this crash were all such that the global was getting re-inserted into llvm.asan.globals anyway, so it didn't matter if we skipped them. But I guess that doesn't need to always be the case. I'll change the patch to look through bitcasts, and I believe the code should already be handling the case of repeated values in llvm.asan.globals.

Dec 18 2018, 11:43 AM · Restricted Project

Dec 17 2018

kubamracek created D55794: [asan] In llvm.asan.globals, allow entries to be non-GlobalVariable and skip over them.
Dec 17 2018, 2:50 PM · Restricted Project

Dec 14 2018

kubamracek added a comment to D55711: Don't trigger sanitizer initialization from `sysctlbyname` interceptor..

If we are going to support this use-case we need a test.

We have iOS simulator tests are they're all currently failing because of this: http://green.lab.llvm.org/green/job/clang-stage1-cmake-RA-expensive/13113/testReport/

Dec 14 2018, 3:09 PM

Dec 12 2018

kubamracek accepted D55116: [CMake] llvm_codesign workaround for Xcode double-signing errors.

I'd slightly prefer to use --force for *all* builds, not just Xcode builds, to have uniformity. But LGTM even in this form if you feel strongly about it.

Dec 12 2018, 11:29 AM

Dec 5 2018

kubamracek added a comment to D44072: [lldb] Retrieve currently handled Obj-C exception via __cxa_current_exception_type and add GetCurrentExceptionBacktrace SB ABI.

Ping.

Dec 5 2018, 8:06 AM

Dec 4 2018

kubamracek accepted D55064: Add new `__sanitizer_mz_default_zone()` API which returns the address of the ASan malloc zone. This API will be used for testing in future patches..
Dec 4 2018, 12:04 PM

Nov 29 2018

kubamracek retitled D44072: [lldb] Retrieve currently handled Obj-C exception via __cxa_current_exception_type and add GetCurrentExceptionBacktrace SB ABI from [lldb] Retrieve currently handled Obj-C exception via __cxa_current_exception_type to [lldb] Retrieve currently handled Obj-C exception via __cxa_current_exception_type and add GetCurrentExceptionBacktrace SB ABI.
Nov 29 2018, 2:21 PM
kubamracek updated the diff for D44072: [lldb] Retrieve currently handled Obj-C exception via __cxa_current_exception_type and add GetCurrentExceptionBacktrace SB ABI.
Nov 29 2018, 2:21 PM

Nov 28 2018

kubamracek added a comment to D43886: [lldb] Add GetCurrentException APIs to SBThread, add frame recognizer for objc_exception_throw for Obj-C runtimes.

Landed, thanks for the review!

Nov 28 2018, 2:05 PM
kubamracek updated the diff for D43886: [lldb] Add GetCurrentException APIs to SBThread, add frame recognizer for objc_exception_throw for Obj-C runtimes.

Updated patch. I've added a static AppleObjCRuntime::GetExceptionThrowLocation(), which returns the location of the exception throw breakpoint for the Obj-C runtime. I tried adding it as virtual method on LanguageRuntime instead, but then it wasn't clear to me how to make it easily return either an optional (there's runtimes that don't have exceptions) or an array (as you said, C++ will need multiple locations) and how to make existing code CreateExceptionResolver work with that. Let me know if that's okay.

Nov 28 2018, 1:08 PM

Nov 27 2018

kubamracek added a comment to D54904: Introduce `AddressSpaceView` template parameter to `SizeClassAllocator32`, `FlatByteMap`, and `TwoLevelByteMap`..

Please make this make independent on the other (type_trains).

Nov 27 2018, 8:32 AM
kubamracek added a comment to D54904: Introduce `AddressSpaceView` template parameter to `SizeClassAllocator32`, `FlatByteMap`, and `TwoLevelByteMap`..

The patch is quite big. I've added a couple suggestions how to reduce it to make it easier to review.

Nov 27 2018, 8:31 AM

Nov 26 2018

kubamracek added a comment to D54889: Fiber support for thread sanitizer.

Can you explain what this patch does a bit? The way I see it, it's just adding an extra level of indirection to each cur_thread() call. Is that it? Does that affect the performance of TSan?

Nov 26 2018, 11:59 AM · Restricted Project, Restricted Project
kubamracek accepted D54908: Fix objc_sync_exit TSAN interceptor.

LGTM.

Nov 26 2018, 11:12 AM · Restricted Project
kubamracek added a comment to D54904: Introduce `AddressSpaceView` template parameter to `SizeClassAllocator32`, `FlatByteMap`, and `TwoLevelByteMap`..

The patch is quite big. I've added a couple suggestions how to reduce it to make it easier to review.

Nov 26 2018, 10:06 AM
kubamracek accepted D54861: [SanitizerCommon] Test `CombinedAllocator::ForEachChunk()` in unit tests..

LGTM, of course (more tests, yay!).

Nov 26 2018, 8:53 AM

Nov 14 2018

kubamracek added inline comments to D54469: Introduce new `disable_init` ASan option that is only supported on platforms where `SANITIZER_SUPPORTS_DISABLED_INIT` is true. Currently this is only supported on Darwin..
Nov 14 2018, 8:56 AM
kubamracek added inline comments to D54469: Introduce new `disable_init` ASan option that is only supported on platforms where `SANITIZER_SUPPORTS_DISABLED_INIT` is true. Currently this is only supported on Darwin..
Nov 14 2018, 8:55 AM
kubamracek added inline comments to D54469: Introduce new `disable_init` ASan option that is only supported on platforms where `SANITIZER_SUPPORTS_DISABLED_INIT` is true. Currently this is only supported on Darwin..
Nov 14 2018, 6:56 AM

Nov 13 2018

kubamracek added a comment to D54469: Introduce new `disable_init` ASan option that is only supported on platforms where `SANITIZER_SUPPORTS_DISABLED_INIT` is true. Currently this is only supported on Darwin..

Can this be triggered by a separate environment variable instead? That way we don't have to expose it in flags at all.

Nov 13 2018, 7:06 AM

Nov 12 2018

kubamracek updated the diff for D43886: [lldb] Add GetCurrentException APIs to SBThread, add frame recognizer for objc_exception_throw for Obj-C runtimes.

Simplifying this a bit further, adding a test, and commenting out the backtrace API, which I'll add in a subsequent commit.

Nov 12 2018, 1:22 PM
kubamracek added a comment to D43884: [lldb] Extract more fields from NSException values.

Thanks for the review!

Nov 12 2018, 11:15 AM
kubamracek created D54432: [lldb] Fix the typo (replace underscore with dash) in svn:ignore on test/ and add "lldb-test-build.noindex" to ignored files.
Nov 12 2018, 9:25 AM
kubamracek created D54431: [lldb] Add "ninja" to svn:ignore.
Nov 12 2018, 9:21 AM
kubamracek added inline comments to D44081: [lldb] Add synthetic frontend for _NSCallStackArray.
Nov 12 2018, 9:19 AM
kubamracek updated the diff for D44081: [lldb] Add synthetic frontend for _NSCallStackArray.
Nov 12 2018, 9:19 AM
kubamracek added inline comments to D43884: [lldb] Extract more fields from NSException values.
Nov 12 2018, 9:07 AM
kubamracek updated the diff for D43884: [lldb] Extract more fields from NSException values.
Nov 12 2018, 9:07 AM

Nov 11 2018

kubamracek added a comment to D41191: [tsan] Use MonotonicNanoTime instead of NanoTime.

Ping.

Nov 11 2018, 5:21 PM · Restricted Project
kubamracek added a comment to D43886: [lldb] Add GetCurrentException APIs to SBThread, add frame recognizer for objc_exception_throw for Obj-C runtimes.

Hi, I've updated this patch after a while. Since then, StackFrameRecognizers have already landed, so this patch now just adds one subclass of a StackFrameRecognizer.

Nov 11 2018, 5:21 PM
kubamracek updated the diff for D43886: [lldb] Add GetCurrentException APIs to SBThread, add frame recognizer for objc_exception_throw for Obj-C runtimes.

Updating patch for the recently-landed StackFrameRecognizers.

Nov 11 2018, 5:11 PM
kubamracek added a reviewer for D43886: [lldb] Add GetCurrentException APIs to SBThread, add frame recognizer for objc_exception_throw for Obj-C runtimes: aprantl.
Nov 11 2018, 5:11 PM
kubamracek added a reviewer for D43884: [lldb] Extract more fields from NSException values: aprantl.

Ping.

Nov 11 2018, 11:18 AM
kubamracek added a reviewer for D44081: [lldb] Add synthetic frontend for _NSCallStackArray: aprantl.

Ping.

Nov 11 2018, 11:17 AM
kubamracek added a reviewer for D44073: [lldb] Refactor ObjC/NSException.cpp (cleanup, avoid code duplication). NFC.: aprantl.

Ping.

Nov 11 2018, 11:17 AM
kubamracek added a comment to D44060: [lldb] Fix "code requires global destructor" warning in g_architecture_mutex.

Ping.

Nov 11 2018, 11:08 AM

Nov 8 2018

kubamracek accepted D54045: Introduce `sanitizer_malloc_introspect_t` for Darwin which is a sub-class of Darwin's `malloc_introspection_t` and use it when setting up the malloc zone..
Nov 8 2018, 6:49 AM

Nov 6 2018

kubamracek updated subscribers of D48445: [sanitizer] Use "fast mmap" kernel flag for shadow memory on macOS 10.13.4+.
r346264 | d0k | 2018-11-06 12:42:19 -0800 (Tue, 06 Nov 2018) | 11 lines
Nov 6 2018, 12:56 PM · Restricted Project
kubamracek added a comment to D53975: Start adding the supporting code to perform out-of-process allocator enumeration..

They're not open source. The interface to them is at https://opensource.apple.com/source/Libc/Libc-498/include/malloc/malloc.h.

Nov 6 2018, 10:36 AM

Nov 5 2018

kubamracek added a comment to D53975: Start adding the supporting code to perform out-of-process allocator enumeration..

Is this out of process only to enumarate? Is there an option to support this through debugging interfaces and analysis of a program? I mean to inspect asanitized program from an external debugger(-like) program.

Nov 5 2018, 6:27 PM
kubamracek added a comment to D53975: Start adding the supporting code to perform out-of-process allocator enumeration..

Can you please be more specific about what exactly are you objecting against? We really want the code for the out-of-process enumeration to be part of compiler-rt, otherwise we'll be getting downstream failures forever. And in compiler-rt, the code belongs to the allocator.

Nov 5 2018, 6:18 PM
kubamracek added a comment to D54045: Introduce `sanitizer_malloc_introspect_t` for Darwin which is a sub-class of Darwin's `malloc_introspection_t` and use it when setting up the malloc zone..

Okay, let's initially remove the header file and just move the struct into the .inc file. We can always move it to a separate header later if needed.

Nov 5 2018, 2:00 PM
kubamracek added a comment to D54045: Introduce `sanitizer_malloc_introspect_t` for Darwin which is a sub-class of Darwin's `malloc_introspection_t` and use it when setting up the malloc zone..

Looks good. I assume the struct definition cannot be moved into the .inc file because we're going to need to access it from other places?

Nov 5 2018, 12:16 PM

Nov 2 2018

kubamracek accepted D54037: [NFC] Refactor initialisation of Darwin malloc zone fields into separate function called `InitMallocZoneFields()` which is now called from `ReplaceSystemMalloc()`..
Nov 2 2018, 8:27 AM

Nov 1 2018

kubamracek added a comment to D53975: Start adding the supporting code to perform out-of-process allocator enumeration..
In D53975#1284724, @kcc wrote:

have you considered implementing this fully outside of the sanitizer allocator?

Nov 1 2018, 3:55 PM

Oct 30 2018

kubamracek reopened D44603: [lldb] Introduce StackFrameRecognizer.
Oct 30 2018, 6:25 PM
kubamracek reopened D44603: [lldb] Introduce StackFrameRecognizer.
Oct 30 2018, 5:31 PM
kubamracek added a comment to D44603: [lldb] Introduce StackFrameRecognizer.

Ping.

Oct 30 2018, 11:17 AM
kubamracek updated the diff for D48445: [sanitizer] Use "fast mmap" kernel flag for shadow memory on macOS 10.13.4+.

Okay, simplifying this patch back, and only applying the "fast mmap" flag based on a size threshold.

Oct 30 2018, 11:17 AM · Restricted Project

Oct 29 2018

kubamracek accepted D53777: [sanitizer] Move interceptor initialization check into real_clock_gettime.

Okay, yup, this works. Thanks!

Oct 29 2018, 11:59 AM
kubamracek added a comment to D53777: [sanitizer] Move interceptor initialization check into real_clock_gettime.

I'll try the patch and get back to you. I'm not sure if COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED is the right thing to check here. Checking &REAL(clock_gettime) == nullptr would work.

Oct 29 2018, 11:28 AM

Oct 24 2018

kubamracek closed D48226: [lldb] Remove enableThreadSanitizer from shared Xcode schemes.

r345155.

Oct 24 2018, 9:02 AM

Oct 23 2018

kubamracek updated the diff for D44603: [lldb] Introduce StackFrameRecognizer.

Adding class comments, adding IDs to recognizers.

Oct 23 2018, 9:33 PM
kubamracek added a reviewer for D48226: [lldb] Remove enableThreadSanitizer from shared Xcode schemes: aprantl.

Ping.

Oct 23 2018, 9:03 PM
kubamracek updated the diff for D44603: [lldb] Introduce StackFrameRecognizer.

Updating patch, addressing most comments. Changed '-m' to '-s'. Added 'frame recognizer info' subcommand. Improved wording in documentation.

Oct 23 2018, 12:13 PM
kubamracek added a comment to D53528: [sanitizer] Avoid calling a nullptr in MonotonicNanoTime if interceptors are not yet initialized.

So, it's okay to land this?

Oct 23 2018, 11:36 AM · Restricted Project
kubamracek added a comment to D53528: [sanitizer] Avoid calling a nullptr in MonotonicNanoTime if interceptors are not yet initialized.

The problem I'm seeing is when real_clock_gettime does exist, but it's not yet initialized, see the backtrace posted earlier. I'm not sure how performance sensitive this area is: Is it used elsewhere other than the memory allocator?

Oct 23 2018, 8:53 AM · Restricted Project
kubamracek updated the diff for D53528: [sanitizer] Avoid calling a nullptr in MonotonicNanoTime if interceptors are not yet initialized.
Oct 23 2018, 8:48 AM · Restricted Project
kubamracek added a comment to D53528: [sanitizer] Avoid calling a nullptr in MonotonicNanoTime if interceptors are not yet initialized.

There is a check for real_clock_gettime (as an extern "C", not part of the interception namespace) in MonotonicNanoTime, as defined by sanitizer_common_interceptors.inc, can this check be moved there? eg: if real_clock_gettime exists & the interception function is not null?

Oct 23 2018, 8:42 AM · Restricted Project

Oct 22 2018

kubamracek added a comment to D53171: [tsan] Bring Dispatch support to Linux.

Is it possible to make it just part of tsan without introducing a separate static library? That would be more scalable and easier to use.

We already doing something similar in tsan_interceptors.cc. For example, we intercept some libc++ functions, but end user may not link in libc++ and it will all work because interceptors do dynamic dispatch and don't fail if a function is not resolved.
This would require calling all dispatch functions as REAL(dispatch_foo), but otherwise should work.

Oct 22 2018, 2:08 PM · Restricted Project
kubamracek added a comment to D53167: [interception] Switch to _type suffix instead of _f, NFC..

Okay, I'm going to land this as it is. I hope that _type is clear enough.

Oct 22 2018, 1:56 PM · Restricted Project
kubamracek created D53528: [sanitizer] Avoid calling a nullptr in MonotonicNanoTime if interceptors are not yet initialized.
Oct 22 2018, 1:50 PM · Restricted Project

Oct 12 2018

kubamracek accepted D53111: [lit] Support the `%shared_libasan` lit substitution on Apple platforms..
Oct 12 2018, 4:36 PM

Oct 11 2018

kubamracek accepted D53183: Fix bug where `config.asan_dynamic` in generated ASan `lit.site.cfg` files was set to `False` for macOS. It should actually be `True` because dylibs are the only supported form of the ASan runtime on Apple platforms..
Oct 11 2018, 6:58 PM
kubamracek created D53171: [tsan] Bring Dispatch support to Linux.
Oct 11 2018, 2:46 PM · Restricted Project
kubamracek created D53167: [interception] Switch to _type suffix instead of _f, NFC..
Oct 11 2018, 1:45 PM · Restricted Project

Oct 10 2018

kubamracek added a comment to D53111: [lit] Support the `%shared_libasan` lit substitution on Apple platforms..

What breaks if we switch to the absolute path on Linux?

Oct 10 2018, 3:57 PM

Oct 1 2018

kubamracek accepted D52717: [NFC] Fix `-Wcast-qual` warnings in Darwin `internal_sysctl(...)` implementation..
Oct 1 2018, 9:37 AM

Sep 21 2018

kubamracek accepted D52350: When running the ios/iossim prepare script show the script output when it returns with a non-zero exit code..
Sep 21 2018, 8:16 AM

Sep 17 2018

kubamracek added a comment to D48445: [sanitizer] Use "fast mmap" kernel flag for shadow memory on macOS 10.13.4+.

This revision is marked as "Accepted", but the last round of changes are touching other files than before. @kcc, @dvyukov, @eugenis, are you okay with these changes?

Sep 17 2018, 11:24 AM · Restricted Project