commit fa6aa872225f8d33a90d936e7a81b64d2cea68e1 [browse]
Author: David Chase
Date: 2021-08-04 19:11:35 Z
[release-branch.go1.16] go1.16.7
Change-Id: I5a8616596c53b43f60487e19385b6a60af1addfe
Reviewed-on: https://go-review.googlesource.com/c/go/+/339451
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Alexander Rakoczy <alex@golang.org>
Trust: Damien Neil <dneil@google.com>
Trust: Carlos Amedee <carlos@golang.org>
commit a6ca6d90b3ca1f0a9fab6cde41079176c1d2094c [browse]
Author: Damien Neil
Date: 2021-08-03 19:38:37 -07:00
[release-branch.go1.16] net/http: speed up and deflake TestCancelRequestWhenSharingConnection
This test made many requests over the same connection for 10
seconds, trusting that this will exercise the request cancelation
race from #41600.
Change the test to exhibit the specific race in a targeted fashion
with only two requests.
Fixes #47535.
Updates #41600.
Updates #47016.
Change-Id: If99c9b9331ff645f6bb67fe9fb79b8aab8784710
Reviewed-on: https://go-review.googlesource.com/c/go/+/339594
Trust: Damien Neil <dneil@google.com>
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Reviewed-by: Heschi Kreinick <heschi@google.com>
(cherry picked from commit 6e738868a7a943d7d4fd6bb1963e7f6d78111726)
Reviewed-on: https://go-review.googlesource.com/c/go/+/339830
commit 16ab7e49d4070c4f68e88836b123dbe6da8bb015 [browse]
Author: Derek Parker
Date: 2021-06-17 20:22:40 Z
[release-branch.go1.16] runtime: fix crash during VDSO calls on PowerPC
This patch reinstates a fix for PowerPC with regard to making VDSO calls
while receiving a signal, and subsequently crashing. The crash happens
because certain VDSO calls can modify the r30 register, which is where g
is stored. This change was reverted for PowerPC because r30 is supposed
to be a non-volatile register. This is true, but that only makes a
guarantee across function calls, but not "within" a function call. This
patch was seemingly fine before because the Linux kernel still had hand
rolled assembly VDSO function calls, however with a recent change to C
function calls it seems the compiler used can generate instructions
which temporarily clobber r30. This means that when we receive a signal
during one of these calls the value of r30 will not be the g as the
runtime expects, causing a segfault.
You can see from this assembly dump how the register is clobbered during
the call:
(the following is from a 5.13rc2 kernel)
```
Dump of assembler code for function __cvdso_clock_gettime_data:
0x00007ffff7ff0700 <+0>: cmplwi r4,15
0x00007ffff7ff0704 <+4>: bgt 0x7ffff7ff07f0 <__cvdso_clock_gettime_data+240>
0x00007ffff7ff0708 <+8>: li r9,1
0x00007ffff7ff070c <+12>: slw r9,r9,r4
0x00007ffff7ff0710 <+16>: andi. r10,r9,2179
0x00007ffff7ff0714 <+20>: beq 0x7ffff7ff0810 <__cvdso_clock_gettime_data+272>
0x00007ffff7ff0718 <+24>: rldicr r10,r4,4,59
0x00007ffff7ff071c <+28>: lis r9,32767
0x00007ffff7ff0720 <+32>: std r30,-16(r1)
0x00007ffff7ff0724 <+36>: std r31,-8(r1)
0x00007ffff7ff0728 <+40>: add r6,r3,r10
0x00007ffff7ff072c <+44>: ori r4,r9,65535
0x00007ffff7ff0730 <+48>: lwz r8,0(r3)
0x00007ffff7ff0734 <+52>: andi. r9,r8,1
0x00007ffff7ff0738 <+56>: bne 0x7ffff7ff07d0 <__cvdso_clock_gettime_data+208>
0x00007ffff7ff073c <+60>: lwsync
0x00007ffff7ff0740 <+64>: mftb r30 <---- RIGHT HERE
=> 0x00007ffff7ff0744 <+68>: ld r12,40(r6)
```
What I believe is happening is that the kernel changed the PowerPC VDSO
calls to use standard C calls instead of using hand rolled assembly. The
hand rolled assembly calls never touched r30, so this change was safe to
roll back. That does not seem to be the case anymore as on the 5.13rc2
kernel the compiler *is* generating assembly which modifies r30, making
this change again unsafe and causing a crash when the program receives a
signal during these calls (which will happen often due to async
preempt). This change happened here:
https://lwn.net/ml/linux-kernel/235e5571959cfa89ced081d7e838ed5ff38447d2.1601365870.git.christophe.leroy@csgroup.eu/.
I realize this was reverted due to unexplained hangs in PowerPC
builders, but I think we should reinstate this change and investigate
those issues separately:
https://github.com/golang/go/commit/f4ca3c1e0a2066ca4f7bd6203866d282ed34acf2
Fixes #46858
Change-Id: Ib18d7bbfc80a1a9cb558f0098878d41081324b52
GitHub-Last-Rev: c3002bcfca3ef58b27485e31328e6297b7a9dfe7
GitHub-Pull-Request: golang/go#46767
Reviewed-on: https://go-review.googlesource.com/c/go/+/328110
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
(cherry picked from commit 16e82be454cbf41299e6a055d54d489ca4612ee0)
Reviewed-on: https://go-review.googlesource.com/c/go/+/334410
Run-TryBot: Cherry Mui <cherryyz@google.com>
commit 37c117f2bf227b14b0be3e1c2411174a6f27b4fe [browse]
Author: Yasuhiro Matsumoto
Date: 2021-06-23 01:02:33 +09:00
[release-branch.go1.16] cmd/go: use path.Dir instead of filepath.Dir for package paths in 'go mod vendor'
copyMetadata walk-up to parent directory until the pkg become modPath.
But pkg should be slash-separated paths. It have to use path.Dir instead of
filepath.Dir.
Updates #46867
Fixes #47015
Change-Id: I44cf1429fe52379a7415b94cc30ae3275cc430e8
Reviewed-on: https://go-review.googlesource.com/c/go/+/330149
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Alexander Rakoczy <alex@golang.org>
Trust: Carlos Amedee <carlos@golang.org>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
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(cherry picked from commit 835d86a17ebf32a3cb081f66119c74363dbd8825)
Reviewed-on: https://go-review.googlesource.com/c/go/+/332329
Reviewed-by: Jay Conrod <jayconrod@google.com>
commit 4c62fd36776c03547f7a9f8dc67c8dac8e987851 [browse]
Author: Constantin Konstantinidis
Date: 2021-06-05 07:48:30 +02:00
[release-branch.go1.16] cmd/go: remove hint when no module is suggested
Updates #46528
Fixes #46551
Change-Id: I2453d321ece878ea7823865758aa4a16b3ed7fe8
Reviewed-on: https://go-review.googlesource.com/c/go/+/325430
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Trust: Heschi Kreinick <heschi@google.com>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
(cherry picked from commit e552a6d31270c86064632af1d092e0db5a930250)
Reviewed-on: https://go-review.googlesource.com/c/go/+/334371
Trust: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
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