gdb/gdb-testsuite-8.3-kfail-xfail-unsupported.patch

- [gdb/testsuite] Add -early pattern flag for gdb_test_multiple
- [gdb/testsuite] Mark watchthreads-reorder.exp FAIL as KFAIL
- [gdb/testsuite] Allow some tests in gdb.base/restore.exp to be unsupported
- [gdb/testsuite] Allow some tests in gdb.base/store.exp to be unsupported
- [gdb/testsuite] Require gnatmake 8 for gdb.ada/rename_subscript_param.exp
- [gdb/tdep] Handle mxcsr kernel bug on Intel Skylake CPUs
- [gdb/testsuite] Add KFAIL for missing support of reverse-debugging of vmovd
- [gdb/testsuite] Fix incomplete regexps in step-precsave.exp
- [gdb/testsuite] Add KFAIL for missing support of reverse-debugging xsave
------------------------------------------------------------
[gdb/testsuite] Add -early pattern flag for gdb_test_multiple

[ https://sourceware.org/ml/gdb-patches/2019-09/msg00600.html ]

Proc gdb_test_multiple builds up and executes a gdb_expect expression with
pattern/action clauses.  The clauses are either implicit (added by
gdb_test_multiple) or explicit (passed via the gdb_test_multiple parameter
user_code).

However, there are a few implicit clauses which are inserted before the
explicit ones, making sure those take precedence.

Add an -early pattern flag for a gdb_test_multiple user_code clause to specify
that the clause needs to be inserted before any implicit clause.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-09-12  Tom de Vries  <tdevries@suse.de>

	* lib/gdb.exp (gdb_test_multiple): Handle -early pattern flag.

------------------------------------------------------------
[gdb/testsuite] Mark watchthreads-reorder.exp FAIL as KFAIL

[ https://sourceware.org/ml/gdb-patches/2019-09/msg00221.html ]

When running gdb.threads/watchthreads-reorder.exp in parallel with:
...
$ n=$(grep -c processor /proc/cpuinfo); n=$((($n + 1) / 2)); stress -c $n
...
there's a reasonable change to trigger an internal gdb error:
...
$ for n in $(seq 1 10); do ./test.sh; done 2>&1 \
  | grep "expected passes" \
  | sort \
  | uniq -c
      1 # of expected passes            14
      2 # of expected passes            15
      1 # of expected passes            16
      6 # of expected passes            17
...
which look like this in gdb.sum:
...
FAIL: gdb.threads/watchthreads-reorder.exp: reorder1: continue to breakpoint: \
  break-at-exit (GDB internal error)
...

This FAIL is filed as PR gdb/24995 and fixed on master by commit c29705b71a
"Fix internal error and improve 'set debug infrun 1'/target wait kind trace".

Mark this as KFAIL for the 8.3 branch.

It's trivial to do this by adding a setup_kfail:
...
+    setup_kfail gdb/24995 "*-*-*"
     gdb_continue_to_breakpoint "break-at-exit" ".*break-at-exit.*"
...
but we'll get a fair amount of KPASSES:
...
KPASS: gdb.threads/watchthreads-reorder.exp: reorder0: \
  continue to breakpoint: break-at-exit (PRMS gdb/24995)
KPASS: gdb.threads/watchthreads-reorder.exp: reorder1: \
  continue to breakpoint: break-at-exit (PRMS gdb/24995)
...

Instead, do this more precise by only KFAILing in case the internal error is
detected.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-09-12  Tom de Vries  <tdevries@suse.de>

	* gdb.threads/watchthreads-reorder.exp: Add PR gdb/24995 KFAIL.

------------------------------------------------------------
[gdb/testsuite] Allow some tests in gdb.base/restore.exp to be unsupported

[ Backport of master commit 77d036789aa. ]

We currently run into:
...
248       n = callee1 (n + l5);
(gdb) PASS: gdb.base/restore.exp: caller5 calls callee1; return callee now
print l1
$51 = <optimized out>
(gdb) FAIL: gdb.base/restore.exp: caller5 calls callee1; return restored l1 \
  to 32492
...

The problem is that we try to access the value of l1 in function caller5, but
variable l1 has no DW_AT_location attribute.  Since l1 is declared using the
register keyword, it's valid for gcc to emit no DW_AT_location at -O0.

Change the FAIL into an UNSUPPORTED.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-09-22  Tom de Vries  <tdevries@suse.de>

	* gdb.base/restore.exp: Allow register variables to be optimized out at
	-O0.

------------------------------------------------------------
[gdb/testsuite] Allow some tests in gdb.base/store.exp to be unsupported

[ Backport of master commit 25e5c20918a. ]

The test-case gdb.base/store.exp fails with gcc 7.4.0:
...
nr of unexpected failures        27
...

The first FAIL:
...
110       l = add_float (l, r);
(gdb) PASS: gdb.base/store.exp: continue to wack_float
print l
$21 = <optimized out>
FAIL: gdb.base/store.exp: var float l; print old l, expecting -1
...
relates to this bit in the test-case (compiled at -O0):
...
   106  float
   107  wack_float (register float u, register float v)
   108  {
   109    register float l = u, r = v;
   110    l = add_float (l, r);
   111    return l + r;
   112  }
...
and it expects to be able to read and modify variable l before executing line
110, but it already fails to read the value, because l has no DW_AT_location
attribute in the debug info.

Variable l is declared with the register keyword, and GCC implements the
register keyword at -O0 like so:
...
the compiler allocates distinct stack memory for all variables that do not
have the register storage-class specifier; if register is specified, the
variable may have a shorter lifespan than the code would indicate and may
never be placed in memory.
...

The fact that l has no DW_AT_location attribute, matches with the documented
"variable may have a shorter lifespan that code would indicate", (though it
is the most extreme case of it) so the gcc behaviour is valid.  We can of
course improve gcc to generate better debuginfo (filed gcc PR91611), but
this not a wrong-debug problem.

[ The test-case passes with gcc 4.2.1, but for the failing test discussed
above, it passes simply because it doesn't store l in a register. ]

With the debug info missing for l, reading and setting l is unsupported, so
fix the FAIL by marking the test UNSUPPORTED instead.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-09-12  Tom de Vries  <tdevries@suse.de>

	* gdb.base/store.exp: Allow register variables to be optimized out at
	-O0.

------------------------------------------------------------
[gdb/testsuite] Require gnatmake 8 for gdb.ada/rename_subscript_param.exp

[ Backport of master commit d1b70248bde. ]

When running gdb.ada/rename_subscript_param.exp with gnatmake 7.4.1, we get:
...
FAIL: gdb.ada/rename_subscript_param.exp: print rename_subscript_param_b \
  before changing its value
FAIL: gdb.ada/rename_subscript_param.exp: print rename_subscript_param_b \
  after changing its value
...

The commit last touching the test-case (afcfda091e) states:
...
    The test still fails with old compilers that do not properly
    generate debug info for this renaming:
...

Fix this by requiring at least gnatmake 8 for the test-case.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-09-14  Tom de Vries  <tdevries@suse.de>

	PR teststuite/24599
	* gdb.ada/rename_subscript_param.exp: Require gnatmake 8.
	* lib/ada.exp (gnatmake_version_at_least): New proc.

------------------------------------------------------------
[gdb/tdep] Handle mxcsr kernel bug on Intel Skylake CPUs

[ Backport of master commit 3d4352200e3. ]

On my openSUSE Leap 15.1 x86_64 Skylake system with the default (4.12) kernel,
I run into:
...
FAIL: gdb.base/gcore.exp: corefile restored all registers
...

The problem is that there's a difference in the mxcsr register value before
and after the gcore command:
...
- mxcsr          0x0                 [ ]
+ mxcsr          0x400440            [ DAZ OM ]
...

This can be traced back to amd64_linux_nat_target::fetch_registers, where
xstateregs is partially initialized by the ptrace call:
...
          char xstateregs[X86_XSTATE_MAX_SIZE];
          struct iovec iov;

          amd64_collect_xsave (regcache, -1, xstateregs, 0);
          iov.iov_base = xstateregs;
          iov.iov_len = sizeof (xstateregs);
          if (ptrace (PTRACE_GETREGSET, tid,
                      (unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
            perror_with_name (_("Couldn't get extended state status"));

          amd64_supply_xsave (regcache, -1, xstateregs);
...
after which amd64_supply_xsave is called.

The amd64_supply_xsave call is supposed to only use initialized parts of
xstateregs, but due to a kernel bug on intel skylake (fixed from 4.14 onwards
by commit 0852b374173b "x86/fpu: Add FPU state copying quirk to handle XRSTOR
failure on Intel Skylake CPUs") it can happen that the mxcsr part of
xstateregs is not initialized, while amd64_supply_xsave expects it to be
initialized, which explains the FAIL mentioned above.

Fix the undetermined behaviour by initializing xstateregs before calling
ptrace, which makes sure we get a 0x0 for mxcsr when this kernel bug occurs,
and which also happens to fix the FAIL.

Furthermore, add an xfail for this FAIL which triggers the same kernel bug:
...
FAIL: gdb.arch/amd64-init-x87-values.exp: check_setting_mxcsr_before_enable: \
  check new value of MXCSR is still in place
...

Both FAILs pass when using a 5.3 kernel instead on the system mentioned above.

Tested on x86_64-linux.

gdb/ChangeLog:

2019-09-24  Tom de Vries  <tdevries@suse.de>

	PR gdb/23815
	* amd64-linux-nat.c (amd64_linux_nat_target::fetch_registers):
	Initialize xstateregs before ptrace PTRACE_GETREGSET call.

gdb/testsuite/ChangeLog:

2019-09-24  Tom de Vries  <tdevries@suse.de>

	PR gdb/24598
	* gdb.arch/amd64-init-x87-values.exp: Add xfail.

------------------------------------------------------------
[gdb/testsuite] Add KFAIL for missing support of reverse-debugging of vmovd

[ Backport of master commit 68f7d34dd50. ]

On my openSUSE Leap 15.1 system I run into:
...
(gdb) PASS: gdb.reverse/step-precsave.exp: turn on process record
break 76^M
Breakpoint 2 at 0x400654: file step-reverse.c, line 76.^M
(gdb) PASS: gdb.reverse/step-precsave.exp: breakpoint at end of main
continue^M
Continuing.^M
Process record does not support instruction 0xc5 at address 0x7ffff783fc70.^M
Process record: failed to record execution log.^M
^M
Program stopped.^M
0x00007ffff783fc70 in __memset_avx2_unaligned_erms () from /lib64/libc.so.6^M
(gdb) FAIL: gdb.reverse/step-precsave.exp: run to end of main
...

The problem is that the vmovd instruction is not supported in
reverse-debugging (PR record/23188).

Add a KFAIL for this PR.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-09-27  Tom de Vries  <tdevries@suse.de>

	PR record/23188
	* gdb.reverse/step-precsave.exp: Add kfail for PR record/23188.

------------------------------------------------------------
[gdb/testsuite] Fix incomplete regexps in step-precsave.exp

[ Backport of master commit 060b3ab4eda. ]

The commit 68f7d34dd50 "[gdb/testsuite] Add KFAIL for missing support of
reverse-debugging of vmovd" rewrites a gdb_test into a gdb_test_multiple but
forgets to add the $gdb_prompt part in the regexp.

Add the missing parts of the regexps.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-09-27  Tom de Vries  <tdevries@suse.de>

	* gdb.reverse/step-precsave.exp: Add missing $gdb_prompt in regexps.

------------------------------------------------------------
[gdb/testsuite] Add KFAIL for missing support of reverse-debugging xsave

[ https://sourceware.org/ml/gdb-patches/2019-09/msg00557.html ]

Normally the gdb.reverse/*.exp test-cases pass on my system (apart from the
record/23188 KFAIL for gdb.reverse/step-precsave.exp).  But when specifying
GLIBC_TUNABLES=glibc.tune.hwcaps=-XSAVEC_Usable to force glibc to use
_dl_runtime_resolve_xsave instead of _dl_runtime_resolve_xsavec, we run into
1054 FAILs like this:
...
(gdb) PASS: gdb.reverse/sigall-reverse.exp: b gen_HUP
continue^M
Continuing.^M
Process record does not support instruction 0xfae64 at address \
  0x7ffff7ded958.^M
Process record: failed to record execution log.^M
^M
Program stopped.^M
0x00007ffff7ded958 in _dl_runtime_resolve_xsave () from \
  /lib64/ld-linux-x86-64.so.2^M
(gdb) FAIL: gdb.reverse/sigall-reverse.exp: get signal ABRT
...

The problem is that the xsave instruction is not supported in
reverse-debugging (PR record/25038).

Add KFAILs for this PR.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2019-09-27  Tom de Vries  <tdevries@suse.de>

	PR record/25038
	* gdb.reverse/sigall-precsave.exp: Add PR record/25038 KFAIL.
	* gdb.reverse/sigall-reverse.exp: Same.
	* gdb.reverse/solib-precsave.exp: Same.
	* gdb.reverse/solib-reverse.exp: Same.
	* gdb.reverse/step-precsave.exp: Same.
	* gdb.reverse/until-precsave.exp: Same.
	* gdb.reverse/until-reverse.exp: Same.
	* lib/gdb.exp (gdb_continue_to_breakpoint): Same.

------------------------------------------------------------
diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index 3d5f8726f7f..5f1bc4d84b7 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -798,37 +798,44 @@ proc gdb_test_multiple { command message user_code } {
     set subst_code [uplevel list $subst_code]
 
     set processed_code ""
+    set early_processed_code ""
+    set current_list processed_code
     set patterns ""
     set expecting_action 0
     set expecting_arg 0
     foreach item $user_code subst_item $subst_code {
 	if { $item == "-n" || $item == "-notransfer" || $item == "-nocase" } {
-	    lappend processed_code $item
+	    lappend $current_list $item
 	    continue
 	}
 	if { $item == "-indices" || $item == "-re" || $item == "-ex" } {
-	    lappend processed_code $item
+	    lappend $current_list $item
+	    continue
+	}
+	if { $item == "-early" } {
+	    set current_list early_processed_code
 	    continue
 	}
 	if { $item == "-timeout" || $item == "-i" } {
 	    set expecting_arg 1
-	    lappend processed_code $item
+	    lappend $current_list $item
 	    continue
 	}
 	if { $expecting_arg } {
 	    set expecting_arg 0
-	    lappend processed_code $subst_item
+	    lappend $current_list $subst_item
 	    continue
 	}
 	if { $expecting_action } {
-	    lappend processed_code "uplevel [list $item]"
+	    lappend $current_list "uplevel [list $item]"
 	    set expecting_action 0
 	    # Cosmetic, no effect on the list.
-	    append processed_code "\n"
+	    append $current_list "\n"
+	    set current_list processed_code
 	    continue
 	}
 	set expecting_action 1
-	lappend processed_code $subst_item
+	lappend $current_list $subst_item
 	if {$patterns != ""} {
 	    append patterns "; "
 	}
@@ -891,7 +898,8 @@ proc gdb_test_multiple { command message user_code } {
 	}
     }
 
-    set code {
+    set code $early_processed_code
+    append code {
 	-re ".*A problem internal to GDB has been detected" {
 	    fail "$message (GDB internal error)"
 	    gdb_internal_error_resync
diff --git a/gdb/testsuite/gdb.threads/watchthreads-reorder.exp b/gdb/testsuite/gdb.threads/watchthreads-reorder.exp
index 9bbbb6f2b8b..2e90870087d 100644
--- a/gdb/testsuite/gdb.threads/watchthreads-reorder.exp
+++ b/gdb/testsuite/gdb.threads/watchthreads-reorder.exp
@@ -90,5 +90,19 @@ foreach reorder {0 1} { with_test_prefix "reorder$reorder" {
     # found in the DEBUG_INFRUN code path.
     gdb_test "set debug infrun 1"
 
-    gdb_continue_to_breakpoint "break-at-exit" ".*break-at-exit.*"
+    # Do:
+    #   gdb_continue_to_breakpoint "break-at-exit" ".*break-at-exit.*"
+    # with setup_kfail.
+    set msg "continue to breakpoint: break-at-exit"
+    set pass_pattern "(?:Breakpoint|Temporary breakpoint) .* (at|in) .*break-at-exit.*"
+    set kfail_pattern "internal-error: inferior\\* find_inferior_pid\\(int\\): Assertion .pid != 0. failed\\."
+    gdb_test_multiple "continue" $msg {
+	-early -re "$kfail_pattern" {
+	    setup_kfail gdb/24995 "*-*-*"
+	    exp_continue
+	}
+	-re "\[\r\n\]*(?:$pass_pattern)\[\r\n\]+$gdb_prompt $" {
+	    pass $msg
+	}
+    }
 }}
diff --git a/gdb/testsuite/gdb.base/restore.exp b/gdb/testsuite/gdb.base/restore.exp
index 947fe58be47..56c2f5e3dce 100644
--- a/gdb/testsuite/gdb.base/restore.exp
+++ b/gdb/testsuite/gdb.base/restore.exp
@@ -73,8 +73,17 @@ proc restore_tests { } {
 	    # they should be.
             for {set var 1} {$var <= $c} {incr var} {
                 set expected [expr 0x7eeb + $var]
-	        gdb_test "print l$var" " = $expected" \
-		    "caller$c calls callee$e; return restored l$var to $expected"
+		set test "caller$c calls callee$e; return restored l$var to $expected"
+		set pass_pattern " = $expected"
+		set unsupported_pattern " = <optimized out>"
+	        gdb_test_multiple "print l$var" $test {
+		    -re "\[\r\n\]*(?:$pass_pattern)\[\r\n\]+$gdb_prompt $" {
+			pass $test
+		    }
+		    -re "\[\r\n\]*(?:$unsupported_pattern)\[\r\n\]+$gdb_prompt $" {
+			unsupported $test
+		    }
+		}
             }
         }
     }
diff --git a/gdb/testsuite/gdb.base/store.exp b/gdb/testsuite/gdb.base/store.exp
index c5a7584101a..9c19ce15a7b 100644
--- a/gdb/testsuite/gdb.base/store.exp
+++ b/gdb/testsuite/gdb.base/store.exp
@@ -55,18 +55,29 @@ proc check_set { t l r new add } {
 	}
     }
 
-    gdb_test "print l" " = ${l}" \
-	"${prefix}; print old l, expecting ${l}"
-    gdb_test "print r" " = ${r}" \
-	"${prefix}; print old r, expecting ${r}"
-    gdb_test_no_output "set variable l = 4" \
-	"${prefix}; setting l to 4"
-    gdb_test "print l" " = ${new}" \
-	"${prefix}; print new l, expecting ${new}"
-    gdb_test "next" "return l \\+ r;" \
-	"${prefix}; next over add call"
-    gdb_test "print l" " = ${add}" \
-	"${prefix}; print incremented l, expecting ${add}"
+    set supported 1
+    set test "${prefix}; print old l, expecting ${l}"
+    gdb_test_multiple "print l" "$test"  {
+	-re " = <optimized out>\r\n$gdb_prompt $" {
+	    unsupported $test
+	    set supported 0
+	}
+	-re " = ${l}\r\n$gdb_prompt $" {
+	    pass $test
+	}
+    }
+    if { $supported } {
+	gdb_test "print r" " = ${r}" \
+	    "${prefix}; print old r, expecting ${r}"
+	gdb_test_no_output "set variable l = 4" \
+	    "${prefix}; setting l to 4"
+	gdb_test "print l" " = ${new}" \
+	    "${prefix}; print new l, expecting ${new}"
+	gdb_test "next" "return l \\+ r;" \
+	    "${prefix}; next over add call"
+	gdb_test "print l" " = ${add}" \
+	    "${prefix}; print incremented l, expecting ${add}"
+    }
 }
 
 check_set "charest" "-1 .*" "-2 .*" "4 ..004." "2 ..002."
@@ -81,20 +92,34 @@ check_set "doublest" "-1" "-2" "4" "2"
 #
 
 proc up_set { t l r new } {
+    global gdb_prompt
+
     set prefix "upvar ${t} l"
     gdb_test "tbreak add_${t}"
     gdb_test "continue" "return u . v;" \
 	"continue to add_${t}"
     gdb_test "up" "l = add_${t} .l, r.;" \
 	"${prefix}; up"
-    gdb_test "print l" " = ${l}" \
-	"${prefix}; print old l, expecting ${l}"
-    gdb_test "print r" " = ${r}" \
-	"${prefix}; print old r, expecting ${r}"
-    gdb_test_no_output "set variable l = 4" \
-	"${prefix}; set l to 4"
-    gdb_test "print l" " = ${new}" \
-	"${prefix}; print new l, expecting ${new}"
+
+    set supported 1
+    set test "${prefix}; print old l, expecting ${l}"
+    gdb_test_multiple "print l" "$test"  {
+	-re " = <optimized out>\r\n$gdb_prompt $" {
+	    unsupported $test
+	    set supported 0
+	}
+	-re " = ${l}\r\n$gdb_prompt $" {
+	    pass $test
+	}
+    }
+    if { $supported } {
+	gdb_test "print r" " = ${r}" \
+	    "${prefix}; print old r, expecting ${r}"
+	gdb_test_no_output "set variable l = 4" \
+	    "${prefix}; set l to 4"
+	gdb_test "print l" " = ${new}" \
+	    "${prefix}; print new l, expecting ${new}"
+    }
 }
 
 up_set "charest" "-1 .*" "-2 .*" "4 ..004."
diff --git a/gdb/testsuite/gdb.ada/rename_subscript_param.exp b/gdb/testsuite/gdb.ada/rename_subscript_param.exp
index ffcfa50df33..fd8208825a0 100644
--- a/gdb/testsuite/gdb.ada/rename_subscript_param.exp
+++ b/gdb/testsuite/gdb.ada/rename_subscript_param.exp
@@ -15,6 +15,10 @@
 
 load_lib "ada.exp"
 
+if { ![gnatmake_version_at_least 8] } {
+    return -1
+}
+
 standard_ada_testfile pb30_012
 
 if {[gdb_compile_ada "${srcfile}" "${binfile}" executable [list debug]] != "" } {
diff --git a/gdb/testsuite/lib/ada.exp b/gdb/testsuite/lib/ada.exp
index ee9ade16ae5..b10558811fb 100644
--- a/gdb/testsuite/lib/ada.exp
+++ b/gdb/testsuite/lib/ada.exp
@@ -78,3 +78,23 @@ proc standard_ada_testfile {base_file {dir ""}} {
     set srcfile $srcdir/$subdir/$testdir/$testfile.adb
     set binfile [standard_output_file $testfile]
 }
+
+# Return 1 if gnatmake is at least version $MAJOR.x.x
+
+proc gnatmake_version_at_least { major } {
+    set gnatmake [gdb_find_gnatmake]
+    set gnatmake [lindex [split $gnatmake] 0]
+    set output [exec $gnatmake --version]
+    if { [regexp {GNATMAKE ([^ .]+).([^ .]+).([^ .]+)} $output \
+	      match gnatmake_major gnatmake_minor gnatmake_micro] } {
+	if { $gnatmake_major >= $major } {
+	    return 1
+	} else {
+	    return 0
+	}
+    }
+
+    # Unknown, return 1
+    return 1
+}
+
diff --git a/gdb/amd64-linux-nat.c b/gdb/amd64-linux-nat.c
index 8d0e8eb35cd..b56917c2bc6 100644
--- a/gdb/amd64-linux-nat.c
+++ b/gdb/amd64-linux-nat.c
@@ -238,6 +238,12 @@ amd64_linux_nat_target::fetch_registers (struct regcache *regcache, int regnum)
 	  char xstateregs[X86_XSTATE_MAX_SIZE];
 	  struct iovec iov;
 
+	  /* Pre-4.14 kernels have a bug (fixed by commit 0852b374173b
+	     "x86/fpu: Add FPU state copying quirk to handle XRSTOR failure on
+	     Intel Skylake CPUs") that sometimes causes the mxcsr location in
+	     xstateregs not to be copied by PTRACE_GETREGSET.  Make sure that
+	     the location is at least initialized with a defined value.  */
+	  memset (xstateregs, 0, sizeof (xstateregs));
 	  iov.iov_base = xstateregs;
 	  iov.iov_len = sizeof (xstateregs);
 	  if (ptrace (PTRACE_GETREGSET, tid,
diff --git a/gdb/testsuite/gdb.arch/amd64-init-x87-values.exp b/gdb/testsuite/gdb.arch/amd64-init-x87-values.exp
index cdf92dcd377..5fd18dbb794 100644
--- a/gdb/testsuite/gdb.arch/amd64-init-x87-values.exp
+++ b/gdb/testsuite/gdb.arch/amd64-init-x87-values.exp
@@ -116,7 +116,7 @@ proc_with_prefix check_x87_regs_around_init {} {
 # nop that does not enable any FP features).  Finally check that the
 # mxcsr register still has the value we set.
 proc_with_prefix check_setting_mxcsr_before_enable {} {
-    global binfile
+    global binfile gdb_prompt
 
     clean_restart ${binfile}
 
@@ -127,7 +127,22 @@ proc_with_prefix check_setting_mxcsr_before_enable {} {
 
     gdb_test_no_output "set \$mxcsr=0x9f80" "set a new value for MXCSR"
     gdb_test "stepi" "fwait" "step forward one instruction for mxcsr test"
-    gdb_test "p/x \$mxcsr" " = 0x9f80" "check new value of MXCSR is still in place"
+
+    set test "check new value of MXCSR is still in place"
+    set pass_pattern " = 0x9f80"
+    # Pre-4.14 kernels have a bug (fixed by commit 0852b374173b "x86/fpu:
+    # Add FPU state copying quirk to handle XRSTOR failure on Intel Skylake
+    # CPUs") that causes mxcsr not to be copied, in which case we get 0 instead of
+    # the just saved value.
+    set xfail_pattern " = 0x0"
+    gdb_test_multiple "p/x \$mxcsr" $test {
+	-re "\[\r\n\]*(?:$pass_pattern)\[\r\n\]+$gdb_prompt $" {
+	    pass $test
+	}
+	-re "\[\r\n\]*(?:$xfail_pattern)\[\r\n\]+$gdb_prompt $" {
+	    xfail $test
+	}
+    }
 }
 
 # Start the test file, all FP features will be disabled.  Set new
diff --git a/gdb/testsuite/gdb.reverse/step-precsave.exp b/gdb/testsuite/gdb.reverse/step-precsave.exp
index 7443995c007..f5e15510e1f 100644
--- a/gdb/testsuite/gdb.reverse/step-precsave.exp
+++ b/gdb/testsuite/gdb.reverse/step-precsave.exp
@@ -46,7 +46,15 @@ gdb_test "break $end_of_main" \
 
 # This can take awhile.
 with_timeout_factor 20 {
-    gdb_test "continue" "Breakpoint .* end of main .*" "run to end of main"
+    set test "run to end of main"
+    gdb_test_multiple "continue" $test {
+	-re "Breakpoint .* end of main .*" {
+	    pass $test
+	}
+	-re "Process record does not support instruction 0xc5 at.*$gdb_prompt $" {
+	    kfail "record/23188" $test
+	}
+    }
 }
 
 # So can this, against gdbserver, for example.
diff --git a/gdb/testsuite/gdb.reverse/step-precsave.exp b/gdb/testsuite/gdb.reverse/step-precsave.exp
index f5e15510e1f..2073b8a1542 100644
--- a/gdb/testsuite/gdb.reverse/step-precsave.exp
+++ b/gdb/testsuite/gdb.reverse/step-precsave.exp
@@ -47,11 +47,13 @@ gdb_test "break $end_of_main" \
 # This can take awhile.
 with_timeout_factor 20 {
     set test "run to end of main"
+    set pass_pattern "Breakpoint .* end of main .*"
+    set kfail_pattern "Process record does not support instruction 0xc5 at.*"
     gdb_test_multiple "continue" $test {
-	-re "Breakpoint .* end of main .*" {
+	-re "\[\r\n\]*(?:$pass_pattern)\[\r\n\]+$gdb_prompt $" {
 	    pass $test
 	}
-	-re "Process record does not support instruction 0xc5 at.*$gdb_prompt $" {
+	-re "\[\r\n\]*(?:$kfail_pattern)\[\r\n\]+$gdb_prompt $" {
 	    kfail "record/23188" $test
 	}
     }
diff --git a/gdb/testsuite/gdb.reverse/sigall-precsave.exp b/gdb/testsuite/gdb.reverse/sigall-precsave.exp
index 79a1e7282b6..ccdfde407fc 100644
--- a/gdb/testsuite/gdb.reverse/sigall-precsave.exp
+++ b/gdb/testsuite/gdb.reverse/sigall-precsave.exp
@@ -258,14 +258,20 @@ foreach sig $signals {
     }
 }
 
-gdb_test_multiple "continue" "continue" {
+set kfail_pattern "Process record does not support instruction 0xfae64 at.*"
+set test "run to end of main"
+gdb_test_multiple "continue" $test {
     -re "Breakpoint .* end of main .*$gdb_prompt $" {
-	pass "run to end of main"
+	pass $test
     }
     -re "Breakpoint .* handle_.*$gdb_prompt $" {
 	send_gdb "continue\n"
 	exp_continue
     }
+    -re "\[\r\n\]*(?:$kfail_pattern)\[\r\n\]+$gdb_prompt $" {
+	kfail "gdb/25038" $test
+	return -1
+    }
 }
 
 delete_breakpoints
@@ -289,8 +295,12 @@ set sig_supported 1
 set thissig "ABRT"
 
 # test signal handling
+set record_instruction_kfail 0
 foreach sig [lrange $signals 1 end] {
     test_one_sig $sig
+    if { $record_instruction_kfail } {
+	return -1
+    }
 }
 
 # The last signal (SIGTERM) gets handled slightly differently because
diff --git a/gdb/testsuite/gdb.reverse/sigall-reverse.exp b/gdb/testsuite/gdb.reverse/sigall-reverse.exp
index c734fe8e17a..884a00c5dcf 100644
--- a/gdb/testsuite/gdb.reverse/sigall-reverse.exp
+++ b/gdb/testsuite/gdb.reverse/sigall-reverse.exp
@@ -37,6 +37,7 @@ proc test_one_sig {nextsig} {
     global sig_supported
     global gdb_prompt
     global thissig
+    global record_instruction_kfail
 
     set this_sig_supported $sig_supported
     gdb_test "handle SIG$thissig stop print" \
@@ -51,6 +52,7 @@ proc test_one_sig {nextsig} {
 	    setup_xfail "i*86-pc-linuxoldld-gnu" "i*86-pc-linuxaout-gnu"
 	}
 	set testmsg "get signal $thissig"
+	set kfail_pattern "Process record does not support instruction 0xfae64 at.*"
 	gdb_test_multiple "continue" $testmsg {
 	    -re "Program received signal SIG$thissig.*handle_$thissig.*$gdb_prompt $" {
 		fail "$testmsg (wrong location)"
@@ -62,6 +64,11 @@ proc test_one_sig {nextsig} {
 		xfail $testmsg
 		set need_another_continue 0
 	    }
+	    -re "\[\r\n\]*(?:$kfail_pattern)\[\r\n\]+$gdb_prompt $" {
+		kfail "gdb/25038" "$testmsg"
+		set record_instruction_kfail 1
+		return
+	    }
 	}
     }
 
@@ -237,8 +244,12 @@ set sig_supported 1
 set thissig "ABRT"
 
 # test signal handling
+set record_instruction_kfail 0
 foreach sig [lrange $signals 1 end] {
     test_one_sig $sig
+    if { $record_instruction_kfail } {
+	return -1
+    }
 }
 
 # The last signal (SIGTERM) gets handled slightly differently because
diff --git a/gdb/testsuite/gdb.reverse/solib-precsave.exp b/gdb/testsuite/gdb.reverse/solib-precsave.exp
index 574d79816db..a3f874c09b7 100644
--- a/gdb/testsuite/gdb.reverse/solib-precsave.exp
+++ b/gdb/testsuite/gdb.reverse/solib-precsave.exp
@@ -91,7 +91,18 @@ gdb_test "break $end_of_main" \
     "Breakpoint $decimal at .*$srcfile, line $end_of_main\." \
     "breakpoint at end of main"
 
-gdb_test "continue" "Breakpoint .* end of main .*" "run to end of main"
+set test "run to end of main"
+set pass_pattern "Breakpoint .* end of main .*"
+set kfail_pattern "Process record does not support instruction 0xfae64 at.*"
+gdb_test_multiple "continue" $test {
+    -re "\[\r\n\]*(?:$pass_pattern)\[\r\n\]+$gdb_prompt $" {
+	pass $test
+    }
+    -re "\[\r\n\]*(?:$kfail_pattern)\[\r\n\]+$gdb_prompt $" {
+	kfail "gdb/25038" $test
+	return -1
+    }
+}
 
 gdb_test "record save $precsave" \
     "Saved core file $precsave with execution log\."  \
diff --git a/gdb/testsuite/gdb.reverse/solib-reverse.exp b/gdb/testsuite/gdb.reverse/solib-reverse.exp
index 77c321388b4..53b35239f81 100644
--- a/gdb/testsuite/gdb.reverse/solib-reverse.exp
+++ b/gdb/testsuite/gdb.reverse/solib-reverse.exp
@@ -86,7 +86,18 @@ if [supports_process_record] {
 
 set end_part_one [gdb_get_line_number " end part one" "$srcfile"]
 set end_part_two [gdb_get_line_number " end part two" "$srcfile"]
-gdb_test "until $end_part_one" " end part one.*" "run until end part one"
+set test "run until end part one"
+set pass_pattern " end part one.*"
+set kfail_pattern "Process record does not support instruction 0xfae64 at.*"
+gdb_test_multiple "until $end_part_one" $test {
+    -re "\[\r\n\]*(?:$pass_pattern)\[\r\n\]+$gdb_prompt $" {
+	pass $test
+    }
+    -re "\[\r\n\]*(?:$kfail_pattern)\[\r\n\]+$gdb_prompt $" {
+	kfail "gdb/25038" $test
+	return -1
+    }
+}
 
 gdb_test "reverse-step" " shr1 three .*" "reverse-step third shr1"
 gdb_test "reverse-step" " shr1 two .*"   "reverse-step second shr1"
diff --git a/gdb/testsuite/gdb.reverse/step-precsave.exp b/gdb/testsuite/gdb.reverse/step-precsave.exp
index 2073b8a1542..72ee279f806 100644
--- a/gdb/testsuite/gdb.reverse/step-precsave.exp
+++ b/gdb/testsuite/gdb.reverse/step-precsave.exp
@@ -49,6 +49,7 @@ with_timeout_factor 20 {
     set test "run to end of main"
     set pass_pattern "Breakpoint .* end of main .*"
     set kfail_pattern "Process record does not support instruction 0xc5 at.*"
+    set kfail2_pattern "Process record does not support instruction 0xfae64 at.*"
     gdb_test_multiple "continue" $test {
 	-re "\[\r\n\]*(?:$pass_pattern)\[\r\n\]+$gdb_prompt $" {
 	    pass $test
@@ -56,6 +57,9 @@ with_timeout_factor 20 {
 	-re "\[\r\n\]*(?:$kfail_pattern)\[\r\n\]+$gdb_prompt $" {
 	    kfail "record/23188" $test
 	}
+	-re "\[\r\n\]*(?:$kfail2_pattern)\[\r\n\]+$gdb_prompt $" {
+	    kfail "record/25038" $test
+	}
     }
 }
 
diff --git a/gdb/testsuite/gdb.reverse/until-precsave.exp b/gdb/testsuite/gdb.reverse/until-precsave.exp
index baf21ab7ad2..1f09df193fd 100644
--- a/gdb/testsuite/gdb.reverse/until-precsave.exp
+++ b/gdb/testsuite/gdb.reverse/until-precsave.exp
@@ -50,7 +50,18 @@ gdb_test "break $end_of_main" \
 
 # This can take awhile.
 with_timeout_factor 20 {
-    gdb_test "continue" "Breakpoint .* set breakpoint 10a here .*" "run to end of main"
+    set test "run to end of main"
+    set pass_pattern "Breakpoint .* set breakpoint 10a here .*"
+    set kfail_pattern "Process record does not support instruction 0xfae64 at.*"
+    gdb_test_multiple "continue" $test {
+	-re "\[\r\n\]*(?:$pass_pattern)\[\r\n\]+$gdb_prompt $" {
+	    pass $test
+	}
+	-re "\[\r\n\]*(?:$kfail_pattern)\[\r\n\]+$gdb_prompt $" {
+	    kfail "gdb/25038" $test
+	    return -1
+	}
+    }
 }
 
 # So can this, against gdbserver, for example.
diff --git a/gdb/testsuite/gdb.reverse/until-reverse.exp b/gdb/testsuite/gdb.reverse/until-reverse.exp
index 2e26de3ce7b..804e07f46ca 100644
--- a/gdb/testsuite/gdb.reverse/until-reverse.exp
+++ b/gdb/testsuite/gdb.reverse/until-reverse.exp
@@ -49,9 +49,18 @@ gdb_test "until $bp_location1" \
 
 # Advance up to factorial, outer invocation
 #
-gdb_test "advance factorial" \
-    "factorial .value=6..*$srcfile:$bp_location7.*" \
-    "advance to factorial"
+set test "advance to factorial"
+set pass_pattern "factorial .value=6..*$srcfile:$bp_location7.*"
+set kfail_pattern "Process record does not support instruction 0xfae64 at.*"
+gdb_test_multiple "advance factorial" $test {
+    -re "\[\r\n\]*(?:$pass_pattern)\[\r\n\]+$gdb_prompt $" {
+	pass "$test"
+    }
+    -re "\[\r\n\]*(?:$kfail_pattern)\[\r\n\]+$gdb_prompt $" {
+	kfail "gdb/25038" $test
+	return -1
+    }
+}
 
 # At this point, 'until' should continue the inferior up to when all the
 # inner invocations of factorial() are completed and we are back at this
diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index 5f1bc4d84b7..0d5447dd10c 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -633,10 +633,14 @@ proc gdb_continue_to_breakpoint {name {location_pattern .*}} {
     global gdb_prompt
     set full_name "continue to breakpoint: $name"
 
+    set kfail_pattern "Process record does not support instruction 0xfae64 at.*"
     gdb_test_multiple "continue" $full_name {
 	-re "(?:Breakpoint|Temporary breakpoint) .* (at|in) $location_pattern\r\n$gdb_prompt $" {
 	    pass $full_name
 	}
+	-re "\[\r\n\]*(?:$kfail_pattern)\[\r\n\]+$gdb_prompt $" {
+	    kfail "gdb/25038" $full_name
+	}
     }
 }