runtime: handle signal 34 for musl setgid

It has been observed that setgid hangs when using cgo with musl.
This fix ensures that signal 34 gets handled in an appropriate way,
like signal 33 when using glibc.

Fixes #39343

Change-Id: I89565663e2c361f62cbccfe80aaedf290bd58d57
Reviewed-on: https://go-review.googlesource.com/c/go/+/236518
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

diff --git a/src/runtime/sigtab_linux_generic.go b/src/runtime/sigtab_linux_generic.go
index b26040b80317dbb98972db8835f1993a18171def..38d686544fde9b6b93505ad56bae6594594e4757 100644 (file)
--- a/src/runtime/sigtab_linux_generic.go
+++ b/src/runtime/sigtab_linux_generic.go
@@ -45,7 +45,7 @@ var sigtable = [...]sigTabT{
        /* 31 */ {_SigThrow, "SIGSYS: bad system call"},
        /* 32 */ {_SigSetStack + _SigUnblock, "signal 32"}, /* SIGCANCEL; see issue 6997 */
        /* 33 */ {_SigSetStack + _SigUnblock, "signal 33"}, /* SIGSETXID; see issues 3871, 9400, 12498 */
-       /* 34 */ {_SigNotify, "signal 34"},
+       /* 34 */ {_SigSetStack + _SigUnblock, "signal 34"}, /* musl SIGSYNCCALL; see issue 39343 */
        /* 35 */ {_SigNotify, "signal 35"},
        /* 36 */ {_SigNotify, "signal 36"},
        /* 37 */ {_SigNotify, "signal 37"},

diff --git a/src/runtime/sigtab_linux_mipsx.go b/src/runtime/sigtab_linux_mipsx.go
index 81dd2314c566105278b2a0e8acf57874fec695a5..51ef470ce7ac1ed27e89808e6cef9eaf4d17bc9e 100644 (file)
--- a/src/runtime/sigtab_linux_mipsx.go
+++ b/src/runtime/sigtab_linux_mipsx.go
@@ -42,7 +42,7 @@ var sigtable = [...]sigTabT{
        /*  31 */ {_SigNotify, "SIGXFSZ: file size limit exceeded"},
        /*  32 */ {_SigSetStack + _SigUnblock, "signal 32"}, /* SIGCANCEL; see issue 6997 */
        /*  33 */ {_SigSetStack + _SigUnblock, "signal 33"}, /* SIGSETXID; see issues 3871, 9400, 12498 */
-       /*  34 */ {_SigNotify, "signal 34"},
+       /*  34 */ {_SigSetStack + _SigUnblock, "signal 34"}, /* musl SIGSYNCCALL; see issue 39343 */
        /*  35 */ {_SigNotify, "signal 35"},
        /*  36 */ {_SigNotify, "signal 36"},
        /*  37 */ {_SigNotify, "signal 37"},