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kmemleak: add checksum to backtrace report 

Change /sys/kernel/debug/kmemleak report format slightly, adding
"(extra info)" to the backtrace header:

from: "  backtrace:"
to:   "  backtrace (crc <cksum>):"

The <cksum> allows a user to see recurring backtraces without
detailed/careful reading of multiline stacks.  So after cycling
kmemleak-test a few times, I know some leaks are repeating.

  bash-5.2# grep backtrace /sys/kernel/debug/kmemleak | wc
     62     186    1792
  bash-5.2# grep backtrace /sys/kernel/debug/kmemleak | sort -u | wc
     37     111    1067

syzkaller parses kmemleak for "unreferenced object" only, so is
unaffected by this change.  Other github repos are moribund.

Link: https://lkml.kernel.org/r/20231116224318.124209-3-jim.cromie@gmail.com
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jim Cromie 2023-11-16 15:43:18 -07:00 committed by Andrew Morton
parent 88f9ee2b30
commit 52c5d2bc32
1 changed files with 1 additions and 1 deletions
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2
mm/kmemleak.c
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@ -362,7 +362,7 @@ static void print_unreferenced(struct seq_file *seq,
warn_or_seq_printf(seq, " comm \"%s\", pid %d, jiffies %lu\n",
object->comm, object->pid, object->jiffies);
hex_dump_object(seq, object);
warn_or_seq_printf(seq, " backtrace:\n");
warn_or_seq_printf(seq, " backtrace (crc %x):\n", object->checksum);
for (i = 0; i < nr_entries; i++) {
void *ptr = (void *)entries[i];