>From a UEK5 vmcore, I see that
crash> p &__start___trace_bprintk_fmt
$1 = (const char *(*)[]) 0xffffffffa163f1d0
crash> p &__stop___trace_bprintk_fmt
$2 = (const char *(*)[]) 0xffffffffa163f1f0
so (0xffffffffa163f1f0 - 0xffffffffa163f1d0)/8 = 4.
there are two zero addresses at index 2 and 3.
crash> rd __start___trace_bprintk_fmt 4
ffffffffa163f1d0: ffffffffa11ccdca ffffffffa11ccdca ................
ffffffffa163f1e0: 0000000000000000 0000000000000000 ................
current implementation will fail (no output for trace show command)
on seeing the zero addresses.
fix: ignore zero addresses in add_print_address.
tested to be good (compared the ftrace log from vmcore and that from live
system).
Signed-off-by: Wengang Wang <wen.gang.w...@oracle.com>
---
extensions/trace.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/extensions/trace.c b/extensions/trace.c
index c26b6c7..491e4eb 100644
--- a/extensions/trace.c
+++ b/extensions/trace.c
@@ -2226,6 +2226,8 @@ static int add_print_address(long address)
size_t len;
int i;
+ if (!address)
+ return 0;
len = read_string(address, string, sizeof(string));
if (!len)
return -1;
--
1.8.3.1
--
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