[PATCH 1/4] tests/intel/xe_exec_reset: Fix gt reset fault dmesg ignore regex

[Shuicheng Lin <shuicheng.lin@intel.com>]

igt_emit_ignore_dmesg_regex() passes the regex to igt_runner through
/dev/kmsg, and the kernel escapes '\' as "\x5c" in kmsg records.
igt_runner compiles the ignore regex from the escaped record, so
"\(-ECANCELED\)" turns into "\x5c(-ECANCELED\x5c)", which requires a
literal backslash and never matches. As a result the expected
"(-ECANCELED) ... GT: reset failed" and "(-EIO) WEDGED" errors are
reported as dmesg-warn/dmesg-fail in gt-reset-fault-injection.

Use bracket expressions for the literal parentheses so the regex
survives kmsg escaping.

Cc: Nishit Sharma <nishit.sharma@intel.com>
Cc: Jonathan Cavitt <jonathan.cavitt@intel.com>
Signed-off-by: Shuicheng Lin <shuicheng.lin@intel.com>
---
 tests/intel/xe_exec_reset.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/tests/intel/xe_exec_reset.c b/tests/intel/xe_exec_reset.c
index 50771af53..901ce2f3f 100644
--- a/tests/intel/xe_exec_reset.c
+++ b/tests/intel/xe_exec_reset.c
@@ -928,12 +928,17 @@ static int try_vm_create(int fd)
 
 static void ignore_gt_reset_fault_dmesg(void)
 {
-	igt_emit_ignore_dmesg_regex("\\(-ECANCELED\\) .* GT: reset failed"
-				    "|\\(-EIO\\) WEDGED: Device declared wedged"
+	/*
+	 * The regex is passed to igt_runner through /dev/kmsg, which escapes
+	 * '\\' as "\\x5c", so use bracket expressions instead of backslash
+	 * escapes for literal parentheses.
+	 */
+	igt_emit_ignore_dmesg_regex("[(]-ECANCELED[)] .* GT: reset failed"
+				    "|[(]-EIO[)] WEDGED: Device declared wedged"
 				    "|IOCTLs and executions are now blocked"
 				    "|For recovery procedure, refer to"
 				    "|Please file a _new_ bug report at"
-				    "|Failed to invalidate GGTT \\(-ENOTRECOVERABLE\\)"
+				    "|Failed to invalidate GGTT [(]-ENOTRECOVERABLE[)]"
 				    "|GPU HANG"
 				    "|Failed to reset");
 }
-- 
2.43.0