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Richard Miller 1b49487692 syscall: eliminate aliasing of syscall error strings in Plan 9
To avoid allocation between entersyscall and exitsyscall in Plan 9,
syscall error strings retrieved from the OS were being stored in
a shared buffer for each M, leading to overwriting of error strings
by subsequent syscalls, and potential confusion if exitsyscall
switched to a different M.  Instead, the error string is now
retrieved to the G stack and then copied to a new allocated array
after exitsyscall.

A new test TestPlan9Syserr is provided to confirm the correction.

Fixes #13770
Fixes #24921

Change-Id: I013c4a42baae80d03a5b61d828396527189f5551
Reviewed-on: https://go-review.googlesource.com/111195
Reviewed-by: David du Colombier <0intro@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: David du Colombier <0intro@gmail.com>
2018-05-08 14:57:01 +00:00
.github github: update Pull Request template 2018-02-21 02:07:46 +00:00
api syscall: introduce Pointer type and use it instead of uintptr 2018-04-18 08:50:42 +00:00
doc doc: document Go 1.10.2 2018-04-30 18:01:00 +00:00
lib/time all: use HTTPS for iana.org links 2018-02-13 18:36:48 +00:00
misc runtime: add js/wasm architecture 2018-05-08 00:17:34 +00:00
src syscall: eliminate aliasing of syscall error strings in Plan 9 2018-05-08 14:57:01 +00:00
test cmd/compile,test: combine byte loads and stores on ppc64le 2018-05-08 13:15:39 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: update email address 2018-04-14 19:28:37 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS C: add Iskander Sharipov's individual CLA mail 2018-04-16 04:49:46 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
PATENTS
README.md README: update number of contributors 2018-04-03 22:10:32 +00:00
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