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2017-04-06[asan] Fix dead stripping of globals on Linux (compiler-rt).Evgeniy Stepanov
This is a re-land of r298173, r298169, r298159. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299698 91177308-0d34-0410-b5e6-96231b3b80d8
2017-04-06Revert r299672: Add a virtual destructor to a class with virtual methods.Ivan Krasin
Reason: breaks sanitizers builds. Original Differential Revision: https://reviews.llvm.org/D317 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299679 91177308-0d34-0410-b5e6-96231b3b80d8
2017-04-06Add __ffssi2 implementation to compiler-rt builtinsDimitry Andric
Summary: During MIPS implementation work for FreeBSD, John Baldwin (jhb@FreeBSD.org) found that gcc 6.x emits calls to __ffssi2() when compiling libc and some userland programs in the base system. Add it to compiler-rt's builtins, based off of the existing __ffsdi2() implementation. Also update the CMake files and add a test case. Reviewers: howard.hinnant, weimingz, rengolin, compnerd Reviewed By: weimingz Subscribers: dberris, mgorny, llvm-commits, emaste Differential Revision: https://reviews.llvm.org/D31721 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299675 91177308-0d34-0410-b5e6-96231b3b80d8
2017-04-06Add a virtual destructor to a class with virtual methods.Ivan Krasin
Summary: Recently, Clang enabled the check for virtual destructors in the presence of virtual methods. That broke the bootstrap build. Fixing it. Reviewers: pcc Reviewed By: pcc Subscribers: llvm-commits, kubamracek Differential Revision: https://reviews.llvm.org/D31776 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299672 91177308-0d34-0410-b5e6-96231b3b80d8
2017-04-06Enable builds of darwin lsan by defaultFrancis Ricci
Summary: Testing and asan leak detection are disabled by default. Reviewers: kubamracek, kcc Subscribers: srhines, llvm-commits, mgorny Differential Revision: https://reviews.llvm.org/D31307 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299669 91177308-0d34-0410-b5e6-96231b3b80d8
2017-04-06[TSan] Adjust expectation for check_analyze.shCraig Topper
r299658 fixed a case where InstCombine was replicating instructions instead of combining. Fixing this reduced the number of pushes and pops in the __tsan_read and __tsan_write functions. Adjust the expectations to account for this after talking to Dmitry Vyukov. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299661 91177308-0d34-0410-b5e6-96231b3b80d8
2017-04-06[XRay][compiler-rt] Remove unused local variableDean Michael Berris
The local was only referenced in assertions. Follow-up to D31345. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299644 91177308-0d34-0410-b5e6-96231b3b80d8
2017-04-06Try to fix MAC buildbot after r299630Maxim Ostapenko
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299632 91177308-0d34-0410-b5e6-96231b3b80d8
2017-04-06Try to fix windows buildbot after r299630Maxim Ostapenko
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299631 91177308-0d34-0410-b5e6-96231b3b80d8
2017-04-06[lsan] Avoid segfaults during threads destruction under high loadMaxim Ostapenko
This patch addresses two issues: * It turned out that suspended thread may have dtls->dtv_size == kDestroyedThread (-1) and LSan wrongly assumes that DTV is available. This leads to SEGV when LSan tries to iterate through DTV that is invalid. * In some rare cases GetRegistersAndSP can fail with errno 3 (ESRCH). In this case LSan assumes that the whole stack of a given thread is available. This is wrong because ESRCH can indicate that suspended thread was destroyed and its stack was unmapped. This patch properly handles ESRCH from GetRegistersAndSP in order to avoid invalid accesses to already unpapped threads stack. Differential Revision: https://reviews.llvm.org/D30818 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299630 91177308-0d34-0410-b5e6-96231b3b80d8
2017-04-06[XRay] [compiler-rt] Unwriting FDR mode buffers when functions are short.Dean Michael Berris
Summary: "short" is defined as an xray flag, and buffer rewinding happens for both exits and tail exits. I've made the choice to seek backwards finding pairs of FunctionEntry, TailExit record pairs and erasing them if the FunctionEntry occurred before exit from the currently exiting function. This is a compromise so that we don't skip logging tail calls if the function that they call into takes longer our duration. This works by counting the consecutive function and function entry, tail exit pairs that proceed the current point in the buffer. The buffer is rewound to check whether these entry points happened recently enough to be erased. It is still possible we will omit them if they call into a child function that is not instrumented which calls a fast grandchild that is instrumented before doing other processing. Reviewers: pelikan, dberris Reviewed By: dberris Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D31345 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299629 91177308-0d34-0410-b5e6-96231b3b80d8
2017-04-06[Builtins] Fix div0 error in udivsi3Weiming Zhao
Summary: Need to save `lr` before bl to aeabi_div0 Reviewers: rengolin, compnerd Reviewed By: compnerd Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D31716 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299628 91177308-0d34-0410-b5e6-96231b3b80d8
2017-04-06[cfi] Fix symbol lookup hack in cross-dso cfi to handle LLD binaries.Evgeniy Stepanov
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299604 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-31[asan] Move AsanCheckDynamicRTPrereqs check under flagMaxim Ostapenko
The patch addresses https://github.com/google/sanitizers/issues/786. Currently AsanCheckDynamicRTPrereqs prevents dynamic ASan runtime from running in some important environments e.g. cowbuilder and fakeroot that may also work with interposition. Let's allow users to switch off the check given that they know what they do. Differential Revision: https://reviews.llvm.org/D31420 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299188 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-30[tsan] Add interceptor for xpc_connection_cancel to avoid false positivesKuba Mracek
TSan reports a false positive when using xpc_connection_cancel. We're missing a happens-before edge from xpc_connection_cancel to the event handler on the same connection. Differential Revision: https://reviews.llvm.org/D31475 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299086 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-30[asan] Implement "scribble" flags, which overwrite free'd memory with 0x55Kuba Mracek
This patch implements "Malloc Scribble" in ASan via "max_free_fill_size" and "free_fill_byte" flags, which can be used to overwrite free()'d memory. We also match the behavior of MallocScribble and MallocPreScribble env vars on macOS (see https://developer.apple.com/library/content/documentation/Performance/Conceptual/ManagingMemory/Articles/MallocDebug.html), which is a helpful tool to detect use-after-free bugs that happen in non-instrumented code. Differential Revision: https://reviews.llvm.org/D30101 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299085 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-30Enable leak detection on linux-i686 by defaultFrancis Ricci
Summary: This is already assumed by the test suite, and by asan_flags.cc. Reviewers: m.ostapenko, vitalybuka, kubamracek, kcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D31462 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299082 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-30[sanitizer] Move fread and fwrite interceptors to sanitizer_commonMaxim Ostapenko
{M, T, E}San have fread and fwrite interceptors, let's move them to sanitizer_common to enable ASan checks as well. Differential Revision: https://reviews.llvm.org/D31456 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299061 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-30[asan] Support line numbers in StackVarDescrKuba Mracek
When -fsanitize-address-use-after-scope is used, the instrumentation produces line numbers in stack frame descriptions. This patch make sure the ASan runtime supports this format (ParseFrameDescription needs to be able to parse "varname:line") and prepares lit tests to allow line numbers in ASan report output. Differential Revision: https://reviews.llvm.org/D31484 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299043 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-29[sanitizers] Fix get_groups interceptor in sanitizer ↵Kostya Serebryany
(https://reviews.llvm.org/D31332, patch by Martin Liška) git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299036 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-29Move current thread data out of lsan_common on linuxFrancis Ricci
Summary: Now that we have a platform-specific non-common lsan file, use it to store non-common lsan data. Reviewers: kubamracek Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D31472 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299032 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-29Remove failing check from platform specific darwin lsan initializerFrancis Ricci
Summary: We currently don't have any platform specific darwin lsan modules, don't force failure if they don't exist. Reviewers: kubamracek Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D31473 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299031 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-29Add allocator_frees_and_returns_null_on_realloc_zero=false flag for ↵Filipe Cabecinhas
compatibility with allocators which allow a realloc(p, 0) and don't free the pointer. Summary: I know of two implementations that do this (ASan is not protecting against accessing the returned memory for now, just like malloc(0)): SIE libc on the PS4 dlmalloc has a flag for this This allows us to properly support this behaviour. Reviewers: vsk, kcc Subscribers: llvm-commits, kubamracek Differential Revision: https://reviews.llvm.org/D31295 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@299016 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-29[XRay] [compiler-rt] Write buffer length to FDR log before writing buffer.Dean Michael Berris
Summary: Currently the FDR log writer, upon flushing, dumps a sequence of buffers from its freelist to disk. A reader can read the first buffer up to an EOB record, but then it is unclear how far ahead to scan to find the next threads traces. There are a few ways to handle this problem. 1. The reader has externalized knowledge of the buffer size. 2. The size of buffers is in the file header or otherwise encoded in the log. 3. Only write out the portion of the buffer with records. When released, the buffers are marked with a size. 4. The reader looks for memory that matches a pattern and synchronizes on it. 2 and 3 seem the most flexible and 2 does not rule 3 out. This is an implementation of 2. In addition, the function handler for fdr more aggressively checks for finalization and makes an attempt to release its buffer. Reviewers: pelikan, dberris Reviewed By: dberris Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D31384 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298982 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-29[XRay][compiler-rt] Add an end-to-end test for FDR LoggingDean Michael Berris
Summary: This change exercises the end-to-end functionality defined in the FDR logging implementation. We also prepare for being able to run traces generated by the FDR logging implementation from being analysed with the llvm-xray command that comes with the LLVM distribution. This also unblocks D31385, D31384, and D31345. Reviewers: kpw, pelikan Subscribers: llvm-commits, mgorny Differential Revision: https://reviews.llvm.org/D31452 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298977 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-29[Builtin] Unxfail tests for armhfWeiming Zhao
Summary: Originally, a few tests fail for armhf target due to: 1) COMPILER_RT_ARMHF_TARGET was not set when building the lib 2) COMPILER_RT_ABI should not be defined as `__attribute__((pcs("aapcs")))` for armhf when building for both lib and tests This address https://bugs.llvm.org//show_bug.cgi?id=32261 mulsc3_test.c is a newly exposed issue, which will be addressed separately. Reviewers: rengolin, compnerd Reviewed By: compnerd Subscribers: aemerson, llvm-commits, mgorny Differential Revision: https://reviews.llvm.org/D31448 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298974 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-28Postpone lsan tls allocation until requiredFrancis Ricci
Summary: This prevents InternalAlloc from being called before the sanitizers are fully initialized. Reviewers: kubamracek, kcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D31306 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298947 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-28Enable i386 builds for darwin lsanFrancis Ricci
Summary: Now that __thread is no longer used for lsan on darwin, i386 builds can be enabled. Reviewers: kcc, kubamracek Subscribers: danalbert, srhines, mgorny, llvm-commits Differential Revision: https://reviews.llvm.org/D29995 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298946 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-27Fix missing sanitizer platform includeFrancis Ricci
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298884 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-27Fix comment in lsan_linux.ccFrancis Ricci
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298879 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-27Move lsan allocator cache from lsan_common_linux to lsan_linuxFrancis Ricci
Having this function in common seems to trigger a lot of unrelated test failures. Given that this isn't really common code anyway, move this to a new linux-specific lsan file. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298878 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-27[powerpc] deactivate ManyThreadsTest asan test on powerpc64Bill Seurer
This test case occassionally hangs when run on powerpc. This is also a problem on AArch64 (see https://bugs.llvm.org/show_bug.cgi?id=24389). Reactivate this when the problem is fixed. This could also be related to the same problem as with the tests ThreadedOneSizeMallocStressTest, ThreadedMallocStressTest, and several others that do not run reliably on powerpc. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298873 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-27Use pthreads for thread-local lsan allocator cache on darwinFrancis Ricci
Summary: This patch allows us to move away from using __thread on darwin, which is requiring for building lsan for darwin on ios version 7 and on iossim i386. Reviewers: kubamracek, kcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D31291 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298848 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-27Fix build error:Ismail Donmez
In file included from /home/abuild/rpmbuild/BUILD/llvm/projects/compiler-rt/lib/xray/tests/unit/xray_fdr_log_printer_tool.cc:15: ../projects/compiler-rt/lib/xray/tests/../xray_fdr_logging_impl.h:221:21: error: use of undeclared identifier 'CLOCK_MONOTONIC' wall_clock_reader(CLOCK_MONOTONIC, &TS); ^ 1 error generated. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298837 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-27[XRay][compiler-rt] Use sanitizer_common's atomic opsDean Michael Berris
Instead of std::atomic APIs for atomic operations, we instead use APIs include with sanitizer_common. This allows us to, at runtime, not have to depend on potentially dynamically provided implementations of these atomic operations. Fixes http://llvm.org/PR32274. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298833 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-26[tsan] Only Acquire/Release GCD queues if they're not NULLKuba Mracek
While it's usually a bug to call GCD APIs, such as dispatch_after, with NULL as a queue, this often "somehow" works and TSan should maintain binary compatibility with existing code. This patch makes sure we don't try to call Acquire and Release on NULL queues, and add one such testcase for dispatch_after. Differential Revision: https://reviews.llvm.org/D31355 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298820 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-26tsan: add new mutex annotationsDmitry Vyukov
There are several problems with the current annotations (AnnotateRWLockCreate and friends): - they don't fully support deadlock detection (we need a hook _before_ mutex lock) - they don't support insertion of random artificial delays to perturb execution (again we need a hook _before_ mutex lock) - they don't support setting extended mutex attributes like read/write reentrancy (only "linker init" was bolted on) - they don't support setting mutex attributes if a mutex don't have a "constructor" (e.g. static, Java, Go mutexes) - they don't ignore synchronization inside of lock/unlock operations which leads to slowdown and false negatives The new annotations solve of the above problems. See tsan_interface.h for the interface specification and comments. Reviewed in https://reviews.llvm.org/D31093 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298809 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-24Follow-up for r298738: Use "0" instead of "false" because the variable is uptr.Kuba Mracek
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298741 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-24Fix an uninitialized field in tsan_block_context_t/AllocContext in ↵Kuba Mracek
tsan_libdispatch_mac.cc. git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298738 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-24Revert "builtins: Select correct code fragments when compiling for ↵Weiming Zhao
Thumb1/Thum2/ARM ISA." This reverts commit c3709191b6d36c4c936173f4a9a29a734b12cb15. (commit by mistake) git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298715 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-24builtins: Select correct code fragments when compiling for Thumb1/Thum2/ARM ISA.Weiming Zhao
Summary: Value of __ARM_ARCH_ISA_THUMB isn't based on the actual compilation mode (-mthumb, -marm), it reflect's capability of given CPU. Due to this: - use __tbumb__ and __thumb2__ insteand of __ARM_ARCH_ISA_THUMB - use '.thumb' directive consistently in all affected files - decorate all thumb functions using DEFINE_COMPILERRT_THUMB_FUNCTION() --------- Note: This patch doesn't fix broken Thumb1 variant of __udivsi3 ! Reviewers: weimingz, rengolin, compnerd Subscribers: aemerson, dim Differential Revision: https://reviews.llvm.org/D30938 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298713 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-24[XRay] [compiler-rt] Plug a file descriptor leak in a failure case.Martin Pelikan
Summary: Fd needs to be closed before the number gets out of scope. Reviewers: dberris Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D31278 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298685 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-24Fix a warning when running the GotsanRuntimeCheck test on Darwin.Kuba Mracek
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298684 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-23Add strtok interceptor for ASAN for Windows.Alex Shlyapnikov
Summary: Fixes test broken by D30384 Reviewers: eugenis Subscribers: kubamracek, llvm-commits Differential Revision: https://reviews.llvm.org/D31312 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298658 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-23[asan] Add an interceptor for strtokAlex Shlyapnikov
Summary: This change addresses https://github.com/google/sanitizers/issues/766. I tested the change with make check-asan and the newly added test case. Reviewers: ygribov, kcc, alekseyshl Subscribers: kubamracek, llvm-commits Patch by mrigger Differential Revision: https://reviews.llvm.org/D30384 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298650 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-23Bypass potential libc's sysconf interceptorsAlex Shlyapnikov
Summary: sysconf(_SC_PAGESIZE) is called very early during sanitizer init and any instrumented code (sysconf() wrapper/interceptor will likely be instrumented) calling back to sanitizer before init is done will most surely crash. 2nd attempt, now with glibc version checks (D31092 was reverted). Reviewers: eugenis Subscribers: kubamracek, llvm-commits Differential Revision: https://reviews.llvm.org/D31221 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298613 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-22Factor lsan allocator cache accesses into a functionFrancis Ricci
Summary: This patch is the first step towards allows us to move away from using __thread for the allocator cache on darwin, which is requiring for building lsan for darwin on ios version 7 and on iossim i386. This will be followed by patches to move the function into OS-specific files. Reviewers: kubamracek, kcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D29994 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298537 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-22tsan: fix a typoDmitry Vyukov
s/covert_morder/convert_morder/ git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298492 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-22[XRay][compiler-rt] Remove dependency on <system_error>Dean Michael Berris
Summary: Depending on C++11 <system_error> introduces a link-time requirement to C++11 symbols. Removing it allows us to depend on header-only C++11 and up libraries. Partially fixes http://llvm.org/PR32274 -- we know there's more invasive work to be done, but we're doing it incrementally. Reviewers: dblaikie, kpw, pelikan Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D31233 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298480 91177308-0d34-0410-b5e6-96231b3b80d8
2017-03-21Revert r298274: "Use pthreads for thread-local lsan allocator cache on darwin"Chandler Carruth
This fixes a failure currently present on the upstream linux boxes (and reproduces for me as well): http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux/builds/1130/steps/64-bit%20check-asan-dynamic/logs/stdio git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298382 91177308-0d34-0410-b5e6-96231b3b80d8
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