The current implementation of compilerVersion incorrectly gives an
error message that the compiler version is too old even though the
system has a recent compiler. This happens for specifically for the
gcc compiler and causes ASAN tests to be skipped.
Replacing -v with gcc dump version options seems to fix it. Running
./testsanitizers.test -test.v now shows the ASAN tests being run.
--- PASS: TestASAN (16.81s)
--- PASS: TestASAN/asan_useAfterReturn (0.60s)
--- PASS: TestASAN/asan_global5 (0.61s)
--- PASS: TestASAN/asan_unsafe_fail1 (0.73s)
--- PASS: TestASAN/asan_unsafe_fail3 (0.73s)
--- PASS: TestASAN/asan_unsafe_fail2 (0.74s)
--- PASS: TestASAN/asan_global4_fail (0.74s)
--- PASS: TestASAN/asan5_fail (0.74s)
--- PASS: TestASAN/asan3_fail (0.88s)
--- PASS: TestASAN/asan4_fail (0.89s)
--- PASS: TestASAN/asan2_fail (0.99s)
--- PASS: TestASAN/asan_global3_fail (1.00s)
--- PASS: TestASAN/asan_global1_fail (1.01s)
--- PASS: TestASAN/asan1_fail (1.01s)
--- PASS: TestASAN/asan_global2_fail (1.02s)
PASS
Fixes#54370
Change-Id: Iac13a1cf37de54432a6e49555f61e9ec1d781ab8
Reviewed-on: https://go-review.googlesource.com/c/go/+/422574
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
Run-TryBot: Archana Ravindar <aravind5@in.ibm.com>
Reviewed-by: Than McIntosh <thanm@google.com>
This fix is analogous to the one in CL 407888.
'go vet' catches the error, but it is not run on this file because the
file is (only) compiled when running testsanitizers/TestTSAN.
Fixes#53113.
Change-Id: I74f7b7390a9775ff00a06214c1019ba28846dd11
Reviewed-on: https://go-review.googlesource.com/c/go/+/409094
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Bryan Mills <bcmills@google.com>
os/signal.Notify requires that "the caller must ensure that c has
sufficient buffer space to keep up with the expected signal rate"
as it does a nonblocking send when it receives a signal. The test
currently using a unbuffered channel, which means it may miss the
signal if the signal arrives before the channel receive operation.
Fixes#52998.
Change-Id: Icdcab9396d735506480ef880fb45a4669fa7cc8f
Reviewed-on: https://go-review.googlesource.com/c/go/+/407888
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
If the test hangs due to a deadlock in a subprocess, we want a
goroutine dump of that process to figure out the nature of the
deadlock. SIGQUIT causes the Go runtime to produce exactly
such a dump (unless the runtime itself is badly deadlocked).
For #52998.
Change-Id: Id9b3ba89d8f705e14f6cd789353fc2b7f4774ad3
Reviewed-on: https://go-review.googlesource.com/c/go/+/407954
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Add tests to test that -asan in Go can detect the error memory access
to the global objects.
Updates #44853.
Change-Id: I612a048460b497d18389160b66e6f818342d3941
Reviewed-on: https://go-review.googlesource.com/c/go/+/321716
Run-TryBot: Fannie Zhang <Fannie.Zhang@arm.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Benny Siegert <bsiegert@gmail.com>
With this patch, -asan option can detect the error memory
access to global variables.
So this patch makes a few changes:
1. Add the asanregisterglobals runtime support function,
which calls asan runtime function _asan_register_globals
to register global variables.
2. Create a new initialization function for the package
being compiled. This function initializes an array of
instrumented global variables and pass it to function
runtime.asanregisterglobals. An instrumented global
variable has trailing redzone.
3. Writes the new size of instrumented global variables
that have trailing redzones into object file.
4. Notice that the current implementation is only compatible with
the ASan library from version v7 to v9. Therefore, using the
-asan option requires that the gcc version is not less than 7
and the clang version is less than 4, otherwise a segmentation
fault will occur. So this patch adds a check on whether the compiler
being used is a supported version in cmd/go.
(This is a redo of CL 401775 with a fix for a build break due to an
intervening commit that removed the internal/execabs package.)
Updates #44853.
Change-Id: I719d4ef2b22cb2d5516e1494cd453c3efb47d6c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/403851
Auto-Submit: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
With this patch, -asan option can detect the error memory
access to global variables.
So this patch makes a few changes:
1. Add the asanregisterglobals runtime support function,
which calls asan runtime function _asan_register_globals
to register global variables.
2. Create a new initialization function for the package
being compiled. This function initializes an array of
instrumented global variables and pass it to function
runtime.asanregisterglobals. An instrumented global
variable has trailing redzone.
3. Writes the new size of instrumented global variables
that have trailing redzones into object file.
4. Notice that the current implementation is only compatible with
the ASan library from version v7 to v9. Therefore, using the
-asan option requires that the gcc version is not less than 7
and the clang version is less than 4, otherwise a segmentation
fault will occur. So this patch adds a check on whether the compiler
being used is a supported version in cmd/go.
Updates #44853.
Change-Id: Ib877a817209ab2be68a8e22c418fe4a4a20880fc
Reviewed-on: https://go-review.googlesource.com/c/go/+/401775
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
With this patch, -asan option can detect the error memory
access to global variables.
So this patch makes a few changes:
1. Add the asanregisterglobals runtime support function,
which calls asan runtime function _asan_register_globals
to register global variables.
2. Create a new initialization function for the package
being compiled. This function initializes an array of
instrumented global variables and pass it to function
runtime.asanregisterglobals. An instrumented global
variable has trailing redzone.
3. Writes the new size of instrumented global variables
that have trailing redzones into object file.
4. Notice that the current implementation is only compatible with
the ASan library from version v7 to v9. Therefore, using the
-asan option requires that the gcc version is not less than 7
and the clang version is less than 4, otherwise a segmentation
fault will occur. So this patch adds a check on whether the compiler
being used is a supported version in cmd/go.
Change-Id: I664e74dcabf5dc7ed46802859174606454e8f1d3
Reviewed-on: https://go-review.googlesource.com/c/go/+/321715
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Fannie Zhang <Fannie.Zhang@arm.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
When ASan is enabled, treat conversions to unsafe.Pointer as
an escaping operation. In this way, all pointer operations on
the stack objects will become operations on the escaped heap
objects. As we've already supported ASan detection of error
memory accesses to heap objects. With this trick, we can use
-asan option to report errors on bad stack operations.
Add test cases.
Updates #44853.
Change-Id: I6281e77f6ba581d7008d610f0b24316078b6e746
Reviewed-on: https://go-review.googlesource.com/c/go/+/393315
Trust: Fannie Zhang <Fannie.Zhang@arm.com>
Run-TryBot: Fannie Zhang <Fannie.Zhang@arm.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Eric Fang <eric.fang@arm.com>
This reverts commit 5fd0ed7aaf.
Reason for revert: <The internal information in commit message is not removed.>
Change-Id: Id6845a9c8114ac71c56a1007a4d133a560a37fbc
Reviewed-on: https://go-review.googlesource.com/c/go/+/393314
Trust: Fannie Zhang <Fannie.Zhang@arm.com>
Reviewed-by: Eric Fang <eric.fang@arm.com>
When ASan is enabled, treat conversions to unsafe.Pointer as
an escaping operation. In this way, all pointer operations on
the stack objects will become operations on the escaped heap
objects. As we've already supported ASan detection of error
memory accesses to heap objects. With this trick, we can use
-asan option to report errors on bad stack operations.
Add test cases.
Updates #44853.
CustomizedGitHooks: yes
Change-Id: I4e7fe46a3ce01f0d219e6a67dc50f4aff7d2ad87
Reviewed-on: https://go-review.googlesource.com/c/go/+/325629
Trust: Fannie Zhang <Fannie.Zhang@arm.com>
Reviewed-by: Keith Randall <khr@golang.org>
The asan runtime functions may run on stacks that cannot grow, and
they do not have large local variables, so it is safe to mark them
as NOSPLIT.
Add test case.
Fixes#50391
Change-Id: Iadcbf1ae0c837d9b64da5be208c7f424e6ba11de
Reviewed-on: https://go-review.googlesource.com/c/go/+/374398
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Fannie Zhang <Fannie.Zhang@arm.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
It appears that GCC before version 10 doesn't report file/line
location for asan errors.
Change-Id: I03ee24180ba365636596aa2384961df7ce6ed71f
Reviewed-on: https://go-review.googlesource.com/c/go/+/374874
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Change-Id: Ic05c641bda3cc8f5292921c9b0c0d3df34f3bc48
Reviewed-on: https://go-review.googlesource.com/c/go/+/374794
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
The current -asan option does not print where the error occurred. The
reason is that the current implementation calls incorrect asan runtime
functions, which do not pass sp and pc where asan runtime functions are
called, and report the stack trace from the native code. But asan runtime
functions are called from cgo on a separated stack, so it cannot dump the
Go stack trace correctly.
The correct asan runtime function we should call is __asan_report_error,
which will pass sp and pc, and report where the error occurred correctly.
This patch fixes this issue.
Add the test cases.
Fixes#50362
Change-Id: I12ee1d46c7ae069ddef3d23f2fe86e112db60045
Reviewed-on: https://go-review.googlesource.com/c/go/+/374395
Trust: Fannie Zhang <Fannie.Zhang@arm.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Add asan tests to check the use of Go with -asan option.
Currenly, the address sanitizer in Go only checks for error
memory access to heap objects.
TODO: Enable check for error memory access to global objects.
Updates #44853.
Change-Id: I83579f229f117b5684a369fc8f365f4dea140648
Reviewed-on: https://go-review.googlesource.com/c/go/+/298615
Trust: fannie zhang <Fannie.Zhang@arm.com>
Run-TryBot: fannie zhang <Fannie.Zhang@arm.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Many uses of Index/IndexByte/IndexRune/Split/SplitN
can be written more clearly using the new Cut functions.
Do that. Also rewrite to other functions if that's clearer.
For #46336.
Change-Id: I68d024716ace41a57a8bf74455c62279bde0f448
Reviewed-on: https://go-review.googlesource.com/c/go/+/351711
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This avoids an incorrect msan uninitialized memory report when using
runtime.SetCgoTraceback when a signal occurs while the fifth argument
register is undefined. See the issue for more details.
Fixes#47543
Change-Id: I3d1b673e2c93471ccdae0171a99b88b5a6062840
Reviewed-on: https://go-review.googlesource.com/c/go/+/339902
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Update references missed in CL 263142.
For #41190
Change-Id: I778760a6a69bd0440fec0848bdef539c9ccb4ee1
GitHub-Last-Rev: dda42b09ff
GitHub-Pull-Request: golang/go#42874
Reviewed-on: https://go-review.googlesource.com/c/go/+/273946
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Cherry Zhang <cherryyz@google.com>
Currently, the cmd/dist runs test cases in misc/cgo/testsantizers only
when memeory sanitizer is supported, but the tsan tests in
misc/cgo/testsanitizers do not require support for -msan option, which
makes tsan tests can not be run on some unsupported -msan option platforms.
Therefore, this patch moves the test constraints from cmd/dist to
msan_test.go, so that the tsan tests in misc/cgo/testsanitizers
can be run on any system where the C compiler supports -fsanitize=thread
option.
Change-Id: I779c92eedd0270050f1a0b1a69ecce50c3712bc9
Reviewed-on: https://go-review.googlesource.com/c/go/+/297774
Trust: fannie zhang <Fannie.Zhang@arm.com>
Run-TryBot: fannie zhang <Fannie.Zhang@arm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Currently, for data moving, we generate an msanread of the source,
followed by an msanwrite of the destination. msanread checks
the source is initialized.
This has a problem: if the source is an aggregate type containing
alignment paddings, the padding bytes may not be thought as
initialized by MSAN. If we copy the aggregate type by value, if
it counts as a read, MSAN reports using uninitialized data. This
CL changes it to use __msan_memmove for data copying, which tells
MSAN to propagate initialized-ness but not check for it.
Caveat: technically __msan_memmove is not a public API of MSAN,
although the C compiler does generate direct calls to it.
Also, when instrumenting a load of a struct, split the
instrumentation to fields, instead of generating an msanread for
the whole struct. This skips padding bytes, which may not be
considered initialized in MSAN.
Fixes#42820.
Change-Id: Id861c8bbfd94cfcccefcc58eaf9e4eb43b4d85c6
Reviewed-on: https://go-review.googlesource.com/c/go/+/270859
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
ARM64's R19-R29 and F8-F15 are callee saved registers, which
should be saved in the beginning of sigtramp, and restored at
the end.
fixes#31827
Change-Id: I622e03f1a13fec969d3a11b6a303a8a492e02bcd
Reviewed-on: https://go-review.googlesource.com/c/go/+/177045
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
If we run 'go test ./...' in the misc module, we don't want to see
errors for these standalone files.
We could instead add +ignore tags to each file individually, but this
is exactly what a testdata directory is for.
Updates #30228
Change-Id: I7047ad888dd6aff701f5982d58b6a79f6a487c58
Reviewed-on: https://go-review.googlesource.com/c/163417
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Otherwise it is possible that msan will consider the C result to be
partially initialized, which may cause msan to think that the Go stack
is partially uninitialized. The compiler will never mark the stack as
initialized, so without this CL it is possible for stack addresses to
be passed to msanread, which will cause a false positive error from msan.
Fixes#26209
Change-Id: I43a502beefd626eb810ffd8753e269a55dff8248
Reviewed-on: https://go-review.googlesource.com/122196
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
With latest gcc (7.3.0), misc/cgo/testsanitizer test will fail with reporting sigmentation
fault when running tsan test. On arm64, tsan is not supported currently and only msan test
can be run. So skip tsan test on arm64.
What needs to be pointed out is that msan test can be really run when setting clang
as c/c++ complier.
Fixes#25601
Change-Id: I6ab1a8d9edd243e2ee00ee40bc0abd6a0e6a125c
Reviewed-on: https://go-review.googlesource.com/114857
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This makes it much easier to run individual failing subtests.
Use $(go env CC) instead of always defaulting to clang; this makes it
easier to test with other compilers.
Run C binaries to detect incompatible compiler/kernel pairings instead
of sniffing versions.
updates #21196
Change-Id: I0debb3cc4a4244df44b825157ffdc97b5c09338d
Reviewed-on: https://go-review.googlesource.com/52910
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Check not only that a tsan program can be built, but also that it runs.
This fails with some installations of GCC 7.
Skip the tsan10 program when using GCC, as it reportedly hangs.
This is a patch to help people build 1.9; we may be able to do a
better fix for 1.10.
Updates #21196
Change-Id: Icd1ffbd018dc65a97ff45cab1264b9b0c7fa0ab2
Reviewed-on: https://go-review.googlesource.com/52790
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
http://golang.org/cl/50251 fixed a regression under TSAN.
This change adds a minimal reproducer for the observed symptom.
Change-Id: Ib9ad01b458b7fdec14d6c2fe3c243f9c64b3dcf2
Reviewed-on: https://go-review.googlesource.com/50371
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
POSIX Shell only supports = to compare variables inside '[' tests. But
this is Bash, where == is an alias for =. In practice they're the same,
but the current form is inconsisnent and breaks POSIX for no good
reason.
Change-Id: I38fa7a5a90658dc51acc2acd143049e510424ed8
Reviewed-on: https://go-review.googlesource.com/38031
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
A typo in the previous revision ("act" instead of "oldact") caused us
to return the sa_flags from the new (or zeroed) sigaction rather than
the old one.
In the presence of a signal handler registered before
runtime.libpreinit, this caused setsigstack to erroneously zero out
important sa_flags (such as SA_SIGINFO) in its attempt to re-register
the existing handler with SA_ONSTACK.
Change-Id: I3cd5152a38ec0d44ae611f183bc1651d65b8a115
Reviewed-on: https://go-review.googlesource.com/37852
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
There are a few problems from change 35494, discovered during testing
of change 37852.
1. I was confused about the usage of n.key in the sema variant, so we
were looping on the wrong condition. The error was not caught by
the TryBots (presumably due to missing TSAN coverage in the BSD and
darwin builders?).
2. The sysmon goroutine sometimes skips notetsleep entirely, using
direct usleep syscalls instead. In that case, we were not calling
_cgo_yield, leading to missed signals under TSAN.
3. Some notetsleep calls have long finite timeouts. They should be
broken up into smaller chunks with a yield at the end of each
chunk.
updates #18717
Change-Id: I91175af5dea3857deebc686f51a8a40f9d690bcc
Reviewed-on: https://go-review.googlesource.com/37867
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Confirm that a trivial executable can build and execute using
-fsanitize=memory.
Fixes#18335 (by skipping the tests when they don't work).
Change-Id: Icb7a276ba7b57ea3ce31be36f74352cc68dc89d5
Reviewed-on: https://go-review.googlesource.com/34505
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This fixes Linux and the *BSD platforms on 386/amd64.
A few OS/arch combinations were already saving registers and/or doing
something that doesn't clearly resemble the SysV C ABI; those have
been left alone.
Fixes#18328.
Change-Id: I6398f6c71020de108fc8b26ca5946f0ba0258667
Reviewed-on: https://go-review.googlesource.com/34501
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Also, if we changed the gsignal stack to match the stack we are
executing on, restore it when returning from the signal handler, for
safety.
Fixes#18255.
Change-Id: Ic289b36e4e38a56f8a6d4b5d74f68121c242e81a
Reviewed-on: https://go-review.googlesource.com/34239
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
This ensures that runtime's signal handlers pass through the TSAN and
MSAN libc interceptors and subsequent calls to the intercepted
sigaction function from C will correctly see them.
Fixes#17753.
Change-Id: I9798bb50291a4b8fa20caa39c02a4465ec40bb8d
Reviewed-on: https://go-review.googlesource.com/33142
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Add missing race and msan checks to reflect.typedmmemove and
reflect.typedslicecopy. Missing these checks caused the race detector
to miss races and caused msan to issue false positive errors.
Fixes#16281.
Change-Id: I500b5f92bd68dc99dd5d6f297827fd5d2609e88b
Reviewed-on: https://go-review.googlesource.com/24760
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Before GCC 7 defined __SANITIZE_THREAD__ when using TSAN,
runtime/cgo/libcgo.h could not determine reliably whether TSAN was in
use when using GCC.
Fixes#15983.
Change-Id: I5581c9f88e1cde1974c280008b2230fe5e971f44
Reviewed-on: https://go-review.googlesource.com/23833
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
