9:16 p.m.
Hi,
'crash' tool cannot read dmesg/log for dumps from Linux HEAD version:
crash> log
log: WARNING: log buf data structure(s) have changed
The reason is one of the Linux changes in HEAD. This change is in -rc
so not many people see this issue. But it will be released in 3.11.
Here is the change
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id...
I believe crash tool should check 'printk_log' structure and if it is
absent then check for 'log'.
2:43 p.m.
New subject: [PATCH] Rename kernel log buffer from 'log' to 'printk_log'
In kernel 3.11 it was renamed to printk_log.
See kernel commit 62e32ac3505a0cab1c5ef8ea2c0eab3b26ed855f
Tested: can run 'log' command for 3.11-rc4 and 3.3 kernel dumps
---
kernel.c | 25 ++++++++++++++++---------
1 file changed, 16 insertions(+), 9 deletions(-)
diff --git a/kernel.c b/kernel.c
index 73c2cc6..6cc4954 100755
--- a/kernel.c
+++ b/kernel.c
@@ -4428,17 +4428,24 @@ dump_variable_length_record_log(int msg_flags)
{
uint32_t idx, log_first_idx, log_next_idx, log_buf_len;
ulong log_buf;
- char *logptr, *logbuf;
+ char *logptr, *logbuf, *log_struct_name = "printk_log";
if (INVALID_SIZE(log)) {
- STRUCT_SIZE_INIT(log, "log");
- MEMBER_OFFSET_INIT(log_ts_nsec, "log", "ts_nsec");
- MEMBER_OFFSET_INIT(log_len, "log", "len");
- MEMBER_OFFSET_INIT(log_text_len, "log", "text_len");
- MEMBER_OFFSET_INIT(log_dict_len, "log", "dict_len");
- MEMBER_OFFSET_INIT(log_level, "log", "level");
- MEMBER_SIZE_INIT(log_level, "log", "level");
- MEMBER_OFFSET_INIT(log_flags_level, "log", "flags_level");
+ STRUCT_SIZE_INIT(log, log_struct_name);
+ if (INVALID_SIZE(log)) {
+ // It looks like a pre 3.11 kernel.
+ // See commit 62e32ac3505a0cab that changed structure name
+ // log -> printk_log
+ log_struct_name = "log";
+ STRUCT_SIZE_INIT(log, log_struct_name);
+ }
+ MEMBER_OFFSET_INIT(log_ts_nsec, log_struct_name, "ts_nsec");
+ MEMBER_OFFSET_INIT(log_len, log_struct_name, "len");
+ MEMBER_OFFSET_INIT(log_text_len, log_struct_name, "text_len");
+ MEMBER_OFFSET_INIT(log_dict_len, log_struct_name, "dict_len");
+ MEMBER_OFFSET_INIT(log_level, log_struct_name, "level");
+ MEMBER_SIZE_INIT(log_level, log_struct_name, "level");
+ MEMBER_OFFSET_INIT(log_flags_level, log_struct_name, "flags_level");
/*
* If things change, don't kill a dumpfile session
--
1.8.3
4:03 p.m.
New subject: [PATCH] Rename kernel log buffer from 'log' to 'printk_log'
Hi
On Tue, Aug 13, 2013 at 12:43 PM, Anatol Pomozov
<anatol.pomozov(a)gmail.com> wrote:
In kernel 3.11 it was renamed to printk_log.
See kernel commit 62e32ac3505a0cab1c5ef8ea2c0eab3b26ed855f
Tested: can run 'log' command for 3.11-rc4 and 3.3 kernel dumps
---
kernel.c | 25 ++++++++++++++++---------
1 file changed, 16 insertions(+), 9 deletions(-)
diff --git a/kernel.c b/kernel.c
index 73c2cc6..6cc4954 100755
--- a/kernel.c
+++ b/kernel.c
@@ -4428,17 +4428,24 @@ dump_variable_length_record_log(int msg_flags)
{
uint32_t idx, log_first_idx, log_next_idx, log_buf_len;
ulong log_buf;
- char *logptr, *logbuf;
+ char *logptr, *logbuf, *log_struct_name = "printk_log";
if (INVALID_SIZE(log)) {
- STRUCT_SIZE_INIT(log, "log");
- MEMBER_OFFSET_INIT(log_ts_nsec, "log", "ts_nsec");
- MEMBER_OFFSET_INIT(log_len, "log", "len");
- MEMBER_OFFSET_INIT(log_text_len, "log", "text_len");
- MEMBER_OFFSET_INIT(log_dict_len, "log", "dict_len");
- MEMBER_OFFSET_INIT(log_level, "log", "level");
- MEMBER_SIZE_INIT(log_level, "log", "level");
- MEMBER_OFFSET_INIT(log_flags_level, "log",
"flags_level");
+ STRUCT_SIZE_INIT(log, log_struct_name);
+ if (INVALID_SIZE(log)) {
It might be better to use kernel_symbol_exists() to find whether it is
new or old style log.
+ // It looks like a pre 3.11 kernel.
+ // See commit 62e32ac3505a0cab that changed structure name
+ // log -> printk_log
+ log_struct_name = "log";
+ STRUCT_SIZE_INIT(log, log_struct_name);
+ }
+ MEMBER_OFFSET_INIT(log_ts_nsec, log_struct_name, "ts_nsec");
+ MEMBER_OFFSET_INIT(log_len, log_struct_name, "len");
+ MEMBER_OFFSET_INIT(log_text_len, log_struct_name, "text_len");
+ MEMBER_OFFSET_INIT(log_dict_len, log_struct_name, "dict_len");
+ MEMBER_OFFSET_INIT(log_level, log_struct_name, "level");
+ MEMBER_SIZE_INIT(log_level, log_struct_name, "level");
+ MEMBER_OFFSET_INIT(log_flags_level, log_struct_name,
"flags_level");
/*
* If things change, don't kill a dumpfile session
--
1.8.3
4:13 p.m.
New subject: [PATCH] Rename kernel log buffer from 'log' to 'printk_log'
----- Original Message -----
Hi
On Tue, Aug 13, 2013 at 12:43 PM, Anatol Pomozov
<anatol.pomozov(a)gmail.com> wrote:
> In kernel 3.11 it was renamed to printk_log.
> See kernel commit 62e32ac3505a0cab1c5ef8ea2c0eab3b26ed855f
>
> Tested: can run 'log' command for 3.11-rc4 and 3.3 kernel dumps
> ---
> kernel.c | 25 ++++++++++++++++---------
> 1 file changed, 16 insertions(+), 9 deletions(-)
>
> diff --git a/kernel.c b/kernel.c
> index 73c2cc6..6cc4954 100755
> --- a/kernel.c
> +++ b/kernel.c
> @@ -4428,17 +4428,24 @@ dump_variable_length_record_log(int msg_flags)
> {
> uint32_t idx, log_first_idx, log_next_idx, log_buf_len;
> ulong log_buf;
> - char *logptr, *logbuf;
> + char *logptr, *logbuf, *log_struct_name = "printk_log";
>
> if (INVALID_SIZE(log)) {
> - STRUCT_SIZE_INIT(log, "log");
> - MEMBER_OFFSET_INIT(log_ts_nsec, "log",
"ts_nsec");
> - MEMBER_OFFSET_INIT(log_len, "log", "len");
> - MEMBER_OFFSET_INIT(log_text_len, "log",
"text_len");
> - MEMBER_OFFSET_INIT(log_dict_len, "log",
"dict_len");
> - MEMBER_OFFSET_INIT(log_level, "log", "level");
> - MEMBER_SIZE_INIT(log_level, "log", "level");
> - MEMBER_OFFSET_INIT(log_flags_level, "log",
"flags_level");
> + STRUCT_SIZE_INIT(log, log_struct_name);
> + if (INVALID_SIZE(log)) {
It might be better to use kernel_symbol_exists() to find whether it is
new or old style log.
> + // It looks like a pre 3.11 kernel.
> + // See commit 62e32ac3505a0cab that changed
> structure name
> + // log -> printk_log
> + log_struct_name = "log";
> + STRUCT_SIZE_INIT(log, log_struct_name);
> + }
> + MEMBER_OFFSET_INIT(log_ts_nsec, log_struct_name,
> "ts_nsec");
> + MEMBER_OFFSET_INIT(log_len, log_struct_name, "len");
> + MEMBER_OFFSET_INIT(log_text_len, log_struct_name,
> "text_len");
> + MEMBER_OFFSET_INIT(log_dict_len, log_struct_name,
> "dict_len");
> + MEMBER_OFFSET_INIT(log_level, log_struct_name, "level");
> + MEMBER_SIZE_INIT(log_level, log_struct_name, "level");
> + MEMBER_OFFSET_INIT(log_flags_level, log_struct_name,
> "flags_level");
>
> /*
> * If things change, don't kill a dumpfile session
> --
> 1.8.3
>
Hello Anatol,
Sorry for the delay -- I'm still recovering from a 2-week vacation, and
I was planning to get around to this tomorrow (hopefully).
Anyway, the kernel_symbol_exists() function only works for kernel symbols,
not for data structures. And I don't think the symbol name of the actual
buffer has changed, correct?
Probably the best way would be to:
if (STRUCT_EXISTS("printk_log")) {
<new way>
} else {
<old way>
}
Can you post another patch?
Thanks,
Dave
5:12 p.m.
New subject: [PATCH] Rename kernel log buffer structure from 'log' to 'printk_log'
In kernel 3.11 it was renamed to printk_log.
See kernel commit 62e32ac3505a0cab1c5ef8ea2c0eab3b26ed855f
Tested: can run 'log' command for 3.11-rc4 and 3.3 kernel dumps
---
kernel.c | 27 ++++++++++++++++++---------
1 file changed, 18 insertions(+), 9 deletions(-)
diff --git a/kernel.c b/kernel.c
index 73c2cc6..ab776b8 100755
--- a/kernel.c
+++ b/kernel.c
@@ -4428,17 +4428,26 @@ dump_variable_length_record_log(int msg_flags)
{
uint32_t idx, log_first_idx, log_next_idx, log_buf_len;
ulong log_buf;
- char *logptr, *logbuf;
+ char *logptr, *logbuf, *log_struct_name;
+
+ if (STRUCT_EXISTS("printk_log")) {
+ // In kernel 3.11 the log structure name was renamed
+ // log -> printk_log
+ // See 62e32ac3505a0cab
+ log_struct_name = "printk_log";
+ } else {
+ log_struct_name = "log";
+ }
if (INVALID_SIZE(log)) {
- STRUCT_SIZE_INIT(log, "log");
- MEMBER_OFFSET_INIT(log_ts_nsec, "log", "ts_nsec");
- MEMBER_OFFSET_INIT(log_len, "log", "len");
- MEMBER_OFFSET_INIT(log_text_len, "log", "text_len");
- MEMBER_OFFSET_INIT(log_dict_len, "log", "dict_len");
- MEMBER_OFFSET_INIT(log_level, "log", "level");
- MEMBER_SIZE_INIT(log_level, "log", "level");
- MEMBER_OFFSET_INIT(log_flags_level, "log", "flags_level");
+ STRUCT_SIZE_INIT(log, log_struct_name);
+ MEMBER_OFFSET_INIT(log_ts_nsec, log_struct_name, "ts_nsec");
+ MEMBER_OFFSET_INIT(log_len, log_struct_name, "len");
+ MEMBER_OFFSET_INIT(log_text_len, log_struct_name, "text_len");
+ MEMBER_OFFSET_INIT(log_dict_len, log_struct_name, "dict_len");
+ MEMBER_OFFSET_INIT(log_level, log_struct_name, "level");
+ MEMBER_SIZE_INIT(log_level, log_struct_name, "level");
+ MEMBER_OFFSET_INIT(log_flags_level, log_struct_name, "flags_level");
/*
* If things change, don't kill a dumpfile session
--
1.8.3
10:58 a.m.
New subject: [PATCH] Rename kernel log buffer structure from 'log' to 'printk_log'
----- Original Message -----
In kernel 3.11 it was renamed to printk_log.
See kernel commit 62e32ac3505a0cab1c5ef8ea2c0eab3b26ed855f
Anatol,
Thanks for catching this. I modified your patch slightly by moving
the "if-else STRUCT_EXISTS()" part down inside the "if
INVALID_SIZE()"
section, since it only needs to be run once per session.
Queued for crash-7.0.2.
Thanks,
Dave
Tested: can run 'log' command for 3.11-rc4 and 3.3 kernel dumps
---
kernel.c | 27 ++++++++++++++++++---------
1 file changed, 18 insertions(+), 9 deletions(-)
diff --git a/kernel.c b/kernel.c
index 73c2cc6..ab776b8 100755
--- a/kernel.c
+++ b/kernel.c
@@ -4428,17 +4428,26 @@ dump_variable_length_record_log(int msg_flags)
{
uint32_t idx, log_first_idx, log_next_idx, log_buf_len;
ulong log_buf;
- char *logptr, *logbuf;
+ char *logptr, *logbuf, *log_struct_name;
+
+ if (STRUCT_EXISTS("printk_log")) {
+ // In kernel 3.11 the log structure name was renamed
+ // log -> printk_log
+ // See 62e32ac3505a0cab
+ log_struct_name = "printk_log";
+ } else {
+ log_struct_name = "log";
+ }
if (INVALID_SIZE(log)) {
- STRUCT_SIZE_INIT(log, "log");
- MEMBER_OFFSET_INIT(log_ts_nsec, "log", "ts_nsec");
- MEMBER_OFFSET_INIT(log_len, "log", "len");
- MEMBER_OFFSET_INIT(log_text_len, "log", "text_len");
- MEMBER_OFFSET_INIT(log_dict_len, "log", "dict_len");
- MEMBER_OFFSET_INIT(log_level, "log", "level");
- MEMBER_SIZE_INIT(log_level, "log", "level");
- MEMBER_OFFSET_INIT(log_flags_level, "log", "flags_level");
+ STRUCT_SIZE_INIT(log, log_struct_name);
+ MEMBER_OFFSET_INIT(log_ts_nsec, log_struct_name, "ts_nsec");
+ MEMBER_OFFSET_INIT(log_len, log_struct_name, "len");
+ MEMBER_OFFSET_INIT(log_text_len, log_struct_name, "text_len");
+ MEMBER_OFFSET_INIT(log_dict_len, log_struct_name, "dict_len");
+ MEMBER_OFFSET_INIT(log_level, log_struct_name, "level");
+ MEMBER_SIZE_INIT(log_level, log_struct_name, "level");
+ MEMBER_OFFSET_INIT(log_flags_level, log_struct_name, "flags_level");
/*
* If things change, don't kill a dumpfile session
--
1.8.3
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5 comments
2 participants
participants (2)
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Anatol Pomozov -
Dave Anderson