Since the new timers run on g0, which does not have a race context,
we add a race context field to the P, and use that for timer functions.
This works since all timer functions are in the standard library.

Updates #27707

Change-Id: I8a5b727b4ddc8ca6fc60eb6d6f5e9819245e395b
Reviewed-on: https://go-review.googlesource.com/c/go/+/171882
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

Updates #27707

Change-Id: Id4b37594511895f404ee3c09a85263b2b35f835d
Reviewed-on: https://go-review.googlesource.com/c/go/+/171881
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>

Since timers are now on a P, rather than having a G running timerproc,
timejump changes to return a P rather than a G.

Updates #27707

Change-Id: I3d05af2d664409a0fd906e709fdecbbcbe00b9a7
Reviewed-on: https://go-review.googlesource.com/c/go/+/171880
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Michael Knyszek <mknyszek@google.com>

It turns out that Windows has "legitimate" keys that have bogus type
values or bogus lengths that don't correspond with their type. On up to
date Windows 10 systems, this test always fails for this reason.

So, this commit alters the test to simply log the discrepancy and move
on.

Fixes #35084

Change-Id: I56e12cc62aff49cfcc38ff01a19dfe53153976a0
Reviewed-on: https://go-review.googlesource.com/c/go/+/202678
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
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Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

It can still be manually disabled again using -d=checkptr=0.

It's also still disabled by default for GOOS=windows, because the
Windows standard library code has a lot of unsafe pointer conversions
that need updating.

Updates #34964.

Change-Id: Ie0b8b4fdf9761565e0dcb00d69997ad896ac233d
Reviewed-on: https://go-review.googlesource.com/c/go/+/201783
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

This CL extends checkptrBase to recognize pointers into the stack and
data/bss sections. I was meaning to do this eventually anyway, but
it's also an easy way to workaround #35068.

Updates #35068.

Change-Id: Ib47f0aa800473a4fbc249da52ff03bec32c3ebe2
Reviewed-on: https://go-review.googlesource.com/c/go/+/202639
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>

Updates #27707

Change-Id: I51da8a04ec12ba1efa435e86e3a15d4d13c96c45
Reviewed-on: https://go-review.googlesource.com/c/go/+/171879
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Michael Knyszek <mknyszek@google.com>

Updates #27707

Change-Id: I1e65effb708911c727d126c51e0f50fe219f42ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/171878
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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The adjusttimers function is where we check the adjustTimers field in
the P struct to see if we need to resort the heap. We walk forward in
the heap and find and resort timers that have been modified, until we
find all the timers that were modified to run earlier. Along the way
we remove deleted timers.

Updates #27707

Change-Id: I1cba7fe77b8112b7e9a9dba80b5dfb08fcc7c568
Reviewed-on: https://go-review.googlesource.com/c/go/+/171877
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Michael Knyszek <mknyszek@google.com>

Also, test that 'go mod download' without arguments reports an error.

Fixes #32027

Change-Id: I873fc59fba4c78ee2b4f49f0d846ee2ac0eee4db
Reviewed-on: https://go-review.googlesource.com/c/go/+/202697
Run-TryBot: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Updates #27707

Change-Id: Idda31d0065064a81c570e291ef588d020871997d
Reviewed-on: https://go-review.googlesource.com/c/go/+/171836
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Michael Knyszek <mknyszek@google.com>

Also add a skeleton of the runOneTimer function.

Updates #27707

Change-Id: Ic6a0279354a57295f823093704b7e152ce5d769d
Reviewed-on: https://go-review.googlesource.com/c/go/+/171835
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Michael Knyszek <mknyszek@google.com>

They're still lacking in details, but at least better than being
printed as raw interface values.

Updates #22218.

Change-Id: I4fd813253afdd6455c0c9b5a05c61659805abad1
Reviewed-on: https://go-review.googlesource.com/c/go/+/202677
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The dodeltimer function removes a timer from a heap. The dodeltimer0
function removes the first timer from a heap; in the old timer code
this common special case was inlined in the timerproc function.

Updates #27707

Change-Id: I1b7c0af46866abb4bffa8aa4d8e7143f9ae8f402
Reviewed-on: https://go-review.googlesource.com/c/go/+/171834
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>

Updates golang/go#30439

Change-Id: Iadc737e4c6bb05bb576fe4bb344ad92403697352
Reviewed-on: https://go-review.googlesource.com/c/go/+/201380
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

Updates #27707

Change-Id: I02f97ec7869ec8a3fb2dfc94cff246badc7ea0fa
Reviewed-on: https://go-review.googlesource.com/c/go/+/171833
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

- Deleted dead code in gopkgin.go.
- Minor documentation changes.

Updates #34924

Change-Id: Ie2c744bbf6662cae20f09163200f20d7589fd237
Reviewed-on: https://go-review.googlesource.com/c/go/+/202565
Run-TryBot: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

The -modcacherw flag is now registered in work.AddModCommonFlags,
which is called from work.AddBuildFlags, where it was registered
before. 'go mod' subcommands register the flag by calling
work.AddModCommonFlags directly.

Also, build commands now exit with an error if -modcacherw is set
explicitly (not in GOFLAGS) in GOPATH mode.

Updates #31481

Change-Id: I461e59a51ed31b006fff4d5c57c2a866be0bbf38
Reviewed-on: https://go-review.googlesource.com/c/go/+/202563
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

Fixes #34978

Change-Id: I3baf1392ba7366ae6628889c47c343ef702ec438
Reviewed-on: https://go-review.googlesource.com/c/go/+/202078Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

CL 137156 introduces an intrinsic on AMD64 that executes vfmadd231sd
when feature detection is successful. However, because floating-point
isn't allowed in note handler, the builder disables SSE instructions,
and fails when attempting to execute this instruction. This change
disables FMA on plan9 to immediately use the software fallback.

Fixes #35063.

Change-Id: I87d8f0995bd2f15013d203e618938f5079c9eed2
Reviewed-on: https://go-review.googlesource.com/c/go/+/202617Reviewed-by: Keith Randall <khr@golang.org>

This adds a new field to P, adjustTimers, that tells the P that one of
its existing timers was modified to be earlier, and that it therefore
needs to resort them.

Updates #27707

Change-Id: I4c5f5b51ed116f1d898d3f87cdddfa1b552337f8
Reviewed-on: https://go-review.googlesource.com/c/go/+/171832
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

Fixes #24929

Change-Id: Icc426068cd73b75b78001f55e1e5d81ccebbe854
Reviewed-on: https://go-review.googlesource.com/c/go/+/127120
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Updates #27707

Change-Id: I720e8af9e183c75abcb63ccc30466734c8dba74f
Reviewed-on: https://go-review.googlesource.com/c/go/+/171831
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

When we add a timer, make sure that the network poller is initialized,
since we will use it if we have to wait for the timer to be ready.

Updates #27707

Change-Id: I0637fe646bade2cc5ce50b745712292aa9c445b1
Reviewed-on: https://go-review.googlesource.com/c/go/+/171830
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

The root cause of #33658 is that fmt.Printf does have side effects when
printing Type.

typefmt for TINTER will call Type.Fields to get all embedded fields and
methods. The thing is that type.Fields itself will call dowidth, which will
expand the embedded interface, make it non-embedded anymore.

To fix it, we add a marker while we are tracing, so dowidth can know and
return immediately without doing anything.

Fixes #33658

Change-Id: Id4b70ff68a3b802675deae96793fdb8f7ef1a4a7
Reviewed-on: https://go-review.googlesource.com/c/go/+/190537
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

The code for generating gcdata was (technically) unsafe. It was also
rather repetitive. This CL refactors it a bit and abstracts use of
gcdata into a helper gcSlice method.

Updates #34972.

Change-Id: Ie86d7822eafe263f1d3d150eedf0ec66be1ec85d
Reviewed-on: https://go-review.googlesource.com/c/go/+/202582
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

This test could be updated to use unsafe.Pointer arithmetic properly
(e.g., see discussion at #34972), but it doesn't seem worthwhile. The
test is just checking that LoadPointer and StorePointer are atomic.

Updates #34972.

Change-Id: I85a8d610c1766cd63136cae686aa8a240a362a18
Reviewed-on: https://go-review.googlesource.com/c/go/+/202597
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

My fix in CL 202618 inadvertently violated an invariant in the inner
loop of TestTCPServer (namely, that len(trchs) == i). That causes a
panic when one or more of the channels is omitted due to a flake.

Instead of trying to fix up the test, let's just factor out a subtest
and skip the whole thing if the transceiver's Dial flakes out.

Updates #32919

Change-Id: Ib6f274a44194311c8c5a2faf19f586cc9eccfd4d
Reviewed-on: https://go-review.googlesource.com/c/go/+/202561
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

The recently added type-validity check uses a new field of Named
types for marking (to detect cycles). That field was modified even
if the type was not part of the current package or belonged to the
Universe scope (error type). This led to race conditions if the
package's type was imported by multiple, concurrently type-checked
packages.

A test would be nice but it's a bit cumbersome to set one up.
Verified manually that package-external types are left alone.

Fixes #35049.

Change-Id: I51686bef47fcca48b99b91ecb1b2e9d58e135ea6
Reviewed-on: https://go-review.googlesource.com/c/go/+/202483Reviewed-by: Bryan C. Mills <bcmills@google.com>

CL 198459 added TestScript/list_ambiguous_path. This
test is failing on Plan 9, because the expected error
doesn't match the error message returned on Plan 9.

This change fixes the test by matching the correct
error message on Plan 9.

Fixes #35072.

Change-Id: If8cdb641e0e9544ae4ac24f8d0c54859a3b23a69
Reviewed-on: https://go-review.googlesource.com/c/go/+/202447
Run-TryBot: David du Colombier <0intro@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

Fixes #22019
Fixes #32919

Change-Id: I60bf6c69b18c3e2d78b494e54adc958fe40134da
Reviewed-on: https://go-review.googlesource.com/c/go/+/202618
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Commit 8f6d68eb (CL 37328) changed the code of sanitizeCookieValue without updating its description.

Change-Id: Ib4a1a1f316548258b828458a31b09706bbd59b53
GitHub-Last-Rev: 9731494e177d909f33dd7d5ecfe1fd1a1c88a3e1
GitHub-Pull-Request: golang/go#34790
Reviewed-on: https://go-review.googlesource.com/c/go/+/200041Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

If a single module is imported via two different paths, go mod tidy
should have reported this error instead of deferring it until go build.

Fixes #34650.

Change-Id: I9d09df1551b3e2083ed9f0bc77f2989073057717
Reviewed-on: https://go-review.googlesource.com/c/go/+/199598
Run-TryBot: Baokun Lee <nototon@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

This reduces the required nosplit stack size, which permits building
on Solaris with -gcflags=all=-N -l.

Fixes #35046

Change-Id: Icb3a421bb791c73e2f670ecfadbe32daea79789f
Reviewed-on: https://go-review.googlesource.com/c/go/+/202446Reviewed-by: Bryan C. Mills <bcmills@google.com>

Fixes #35037

Change-Id: I0b9bcd001556cd409994d83dabcdd6e32b001d28
Reviewed-on: https://go-review.googlesource.com/c/go/+/202441
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

On Windows, os.Chmod and syscall.Chmod toggle the FILE_ATTRIBUTES_
READONLY flag depending on the permission bits. That's a bit odd but I
guess some compromises were made at some point and this is what was
chosen to map to a Unix concept that Windows doesn't really have in the
same way. That's fine. However, the logic used in Chmod was forgotten
from os.Open and syscall.Open, which then manifested itself in various
places, most recently, go modules' read-only behavior.

This makes syscall.Open consistent with syscall.Chmod and adds a test
for the permission _behavior_ using ioutil. By testing the behavior
instead of explicitly testing for the attribute bits we care about, we
make sure this doesn't regress in unforeseen ways in the future, as well
as ensuring the test works on platforms other than Windows.

In the process, we fix some tests that never worked and relied on broken
behavior, as well as tests that were disabled on Windows due to the
broken behavior and had TODO notes.

Fixes #35033

Change-Id: I6f7cf54517cbe5f6b1678d1c24f2ab337edcc7f7
Reviewed-on: https://go-review.googlesource.com/c/go/+/202439
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Fixes #35045

Change-Id: I90ac29882c7d03936c98c4116a8bccdd2ecbf76b
Reviewed-on: https://go-review.googlesource.com/c/go/+/202445
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>

Fixes #35053

Change-Id: I31853d434610880044c169e0c1e9732f97ff1bdb
Reviewed-on: https://go-review.googlesource.com/c/go/+/202444
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David du Colombier <0intro@gmail.com>

Change-Id: I96a9b34bf8e42c21a3e0258cbc8b1416328834be
GitHub-Last-Rev: 32709619a690459dc29a32f12cfbd3908ce270e3
GitHub-Pull-Request: golang/go#35066
Reviewed-on: https://go-review.googlesource.com/c/go/+/202598
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

Make go test -a -short -gcflags=all=-d=checkptr passes on darwin.

Update #34972

Change-Id: I71cf14ec1faccd4837713aa30c90ed665899b908
Reviewed-on: https://go-review.googlesource.com/c/go/+/202158
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>