The patch titled
Subject: scripts/gdb: lx-dmesg: cast log_buf to void* for addr fetch
has been added to the -mm tree. Its filename is
scripts-gdb-lx-dmesg-cast-log_buf-to-void-for-addr-fetch.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/scripts-gdb-lx-dmesg-cast-log_buf-to-void-for-addr-fetch.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/scripts-gdb-lx-dmesg-cast-log_buf-to-void-for-addr-fetch.patch
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------------------------------------------------------
From: Leonard Crestez <leonard.crestez@xxxxxxx>
Subject: scripts/gdb: lx-dmesg: cast log_buf to void* for addr fetch
In some cases it is possible for the str() conversion here to throw
encoding errors because log_buf might not point to valid ascii. For
example:
(gdb) python print str(gdb.parse_and_eval("log_buf"))
Traceback (most recent call last):
File "<string>", line 1, in <module>
UnicodeEncodeError: 'ascii' codec can't encode character u'\u0303' in
position 24: ordinal not in range(128)
Avoid this by explicitly casting to (void *) inside the gdb expression.
Link: http://lkml.kernel.org/r/ba6f85dbb02ca980ebd0e2399b0649423399b565.1498481469.git.leonard.crestez@xxxxxxx
Signed-off-by: Leonard Crestez <leonard.crestez@xxxxxxx>
Reviewed-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Cc: Jason Wessel <jason.wessel@xxxxxxxxxxxxx>
Cc: Kieran Bingham <kieran@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
scripts/gdb/linux/dmesg.py | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN scripts/gdb/linux/dmesg.py~scripts-gdb-lx-dmesg-cast-log_buf-to-void-for-addr-fetch scripts/gdb/linux/dmesg.py
--- a/scripts/gdb/linux/dmesg.py~scripts-gdb-lx-dmesg-cast-log_buf-to-void-for-addr-fetch
+++ a/scripts/gdb/linux/dmesg.py
@@ -24,7 +24,7 @@ class LxDmesg(gdb.Command):
def invoke(self, arg, from_tty):
log_buf_addr = int(str(gdb.parse_and_eval(
- "'printk.c'::log_buf")).split()[0], 16)
+ "(void *)'printk.c'::log_buf")).split()[0], 16)
log_first_idx = int(gdb.parse_and_eval("'printk.c'::log_first_idx"))
log_next_idx = int(gdb.parse_and_eval("'printk.c'::log_next_idx"))
log_buf_len = int(gdb.parse_and_eval("'printk.c'::log_buf_len"))
_
Patches currently in -mm which might be from leonard.crestez@xxxxxxx are
scripts-gdb-lx-dmesg-cast-log_buf-to-void-for-addr-fetch.patch
scripts-gdb-lx-dmesg-use-explicit-encoding=utf8-errors=replace.patch
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