problem with kmemleak

[ttlxzz ccc]

Hi, all:



I just want to use kmemleak, so I make the CONFIG_DEBUG_KMEMLEAK and
CONFIG_DEBUG_FS on, mount the debugfs.

But when I insmod mm/kmemleak-test.ko, echo scan >
/sys/kernel/debug/kmemleak and cat /sys/kernel/debug/kmemleak. I just
see this:

unreferenced object 0xffffc90012d21000 (size 64):

 comm "insmod", pid 13092, jiffies 4298369684

 hex dump (first 32 bytes):

   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................

   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................

 backtrace:

   [<ffffffffffffffff>] 0xffffffffffffffff

unreferenced object 0xffffc90012d24000 (size 64):

 comm "insmod", pid 13092, jiffies 4298369684

 hex dump (first 32 bytes):

   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................

   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................

 backtrace:

   [<ffffffffffffffff>] 0xffffffffffffffff

unreferenced object 0xffffc90012d27000 (size 64):

 comm "insmod", pid 13092, jiffies 4298369684

 hex dump (first 32 bytes):

   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................

   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................

 backtrace:

   [<ffffffffffffffff>] 0xffffffffffffffff

There is no other backtrace except [<ffffffffffffffff>]
0xffffffffffffffff. Then I read the mm/kmemleak.c. In
kmemleak_seq_show(), I find that the object->trace_len is 1.



How can I get the full backtrace?
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