linux-kernel - [PATCH] scripts/decode_stacktrace.sh: Strip unexpected CR from lines

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Date: Mon, 25 Dec 2023 09:40:35 -0800
From: Bjorn Andersson <quic_bjorande@...cinc.com>
To: Andrew Morton <akpm@...ux-foundation.org>
CC: <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Bjorn
 Andersson" <quic_bjorande@...cinc.com>
Subject: [PATCH] scripts/decode_stacktrace.sh: Strip unexpected CR from
 lines

When the kernel log is acquired over a serial cable it is not uncommon
for the log to contain carriage return characters, in addition to the
expected line feeds.

When this output is feed into decode_stacktrace.sh, handle_line() fails
to strip the trailing ']' off the module name, which results in
find_module() not being able to find the referred to kernel module. This
is reported to the user as:

  WARNING! Modules path isn't set, but is needed to parse this symbol

The solution is to reconfigure the serial port, or to strip the carriage
returns from the log, but this isn't obvious from the error reported by
the script.

Instead, make decode_stacktrace.sh more user friendly by stripping the
trailing carriage return.

Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
---
 scripts/decode_stacktrace.sh | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/scripts/decode_stacktrace.sh b/scripts/decode_stacktrace.sh
index 564c5632e1a2..cb980b144ca1 100755
--- a/scripts/decode_stacktrace.sh
+++ b/scripts/decode_stacktrace.sh
@@ -291,6 +291,9 @@ handle_line() {
 }

 while read line; do
+	# Strip unexpected carriage return at end of line
+	line=${line%$'\r'}
+
 	# Let's see if we have an address in the line
 	if [[ $line =~ \[\<([^]]+)\>\] ]] ||
 	   [[ $line =~ [^+\ ]+\+0x[0-9a-f]+/0x[0-9a-f]+ ]]; then

---
base-commit: 39676dfe52331dba909c617f213fdb21015c8d10
change-id: 20231225-decode-stacktrace-cr-3fb9e13afc96

Best regards,
-- 
Bjorn Andersson <quic_bjorande@...cinc.com>