From: Douglas Anderson dianders@chromium.org
[ Upstream commit 3ca676e4ca60d1834bb77535dafe24169cadacef ]
If we detect that we recursively entered the debugger we should hack our I/O ops to NULL so that the panic() in the next line won't actually cause another recursion into the debugger. The first line of kgdb_panic() will check this and return.
Signed-off-by: Douglas Anderson dianders@chromium.org Reviewed-by: Daniel Thompson daniel.thompson@linaro.org Link: https://lore.kernel.org/r/20200507130644.v4.6.I89de39f68736c9de610e6f241e68d... Signed-off-by: Daniel Thompson daniel.thompson@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/debug/debug_core.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c index 79517e5549f1..9c939c6bf21c 100644 --- a/kernel/debug/debug_core.c +++ b/kernel/debug/debug_core.c @@ -443,6 +443,7 @@ static int kgdb_reenter_check(struct kgdb_state *ks)
if (exception_level > 1) { dump_stack(); + kgdb_io_module_registered = false; panic("Recursive entry to debugger"); }