diff options
| author | Douglas Anderson <dianders@chromium.org> | 2018-12-04 19:38:28 -0800 |
|---|---|---|
| committer | Daniel Thompson <daniel.thompson@linaro.org> | 2018-12-30 08:31:23 +0000 |
| commit | 162bc7f5afd75b72acbe3c5f3488ef7e64a3fe36 (patch) | |
| tree | 28a6c66c667177ad20271d85d332f0e3831b955f /kernel/debug/kdb/kdb_debugger.c | |
| parent | 87b095928584da7d5cb3149016f00b0b139c2292 (diff) | |
| download | linux-162bc7f5afd75b72acbe3c5f3488ef7e64a3fe36.tar.bz2 | |
kdb: Don't back trace on a cpu that didn't round up
If you have a CPU that fails to round up and then run 'btc' you'll end
up crashing in kdb becaue we dereferenced NULL. Let's add a check.
It's wise to also set the task to NULL when leaving the debugger so
that if we fail to round up on a later entry into the debugger we
won't backtrace a stale task.
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Diffstat (limited to 'kernel/debug/kdb/kdb_debugger.c')
| -rw-r--r-- | kernel/debug/kdb/kdb_debugger.c | 7 |
1 files changed, 0 insertions, 7 deletions
diff --git a/kernel/debug/kdb/kdb_debugger.c b/kernel/debug/kdb/kdb_debugger.c index 15e1a7af5dd0..53a0df6e4d92 100644 --- a/kernel/debug/kdb/kdb_debugger.c +++ b/kernel/debug/kdb/kdb_debugger.c @@ -118,13 +118,6 @@ int kdb_stub(struct kgdb_state *ks) kdb_bp_remove(); KDB_STATE_CLEAR(DOING_SS); KDB_STATE_SET(PAGER); - /* zero out any offline cpu data */ - for_each_present_cpu(i) { - if (!cpu_online(i)) { - kgdb_info[i].debuggerinfo = NULL; - kgdb_info[i].task = NULL; - } - } if (ks->err_code == DIE_OOPS || reason == KDB_REASON_OOPS) { ks->pass_exception = 1; KDB_FLAG_SET(CATASTROPHIC); |