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cpuidle: lib/bug: Disable rcu_is_watching() during WARN/BUG

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In order to avoid WARN/BUG from generating nested or even recursive
warnings, force rcu_is_watching() true during
WARN/lockdep_rcu_suspicious().

Notably things like unwinding the stack can trigger rcu_dereference()
warnings, which then triggers more unwinding which then triggers more
warnings etc..

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230126151323.408156109@infradead.org
This commit is contained in:
Peter Zijlstra
2023-01-26 16:08:31 +01:00
committed by Ingo Molnar
parent 393e2ea30a
commit 5a5d7e9bad
4 changed files with 49 additions and 1 deletions
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15
lib/bug.c
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@@ -47,6 +47,7 @@
#include <linux/sched.h>
#include <linux/rculist.h>
#include <linux/ftrace.h>
#include <linux/context_tracking.h>
extern struct bug_entry __start___bug_table[], __stop___bug_table[];
@@ -153,7 +154,7 @@ struct bug_entry *find_bug(unsigned long bugaddr)
return module_find_bug(bugaddr);
}
enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs)
static enum bug_trap_type __report_bug(unsigned long bugaddr, struct pt_regs *regs)
{
struct bug_entry *bug;
const char *file;
@@ -209,6 +210,18 @@ enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs)
return BUG_TRAP_TYPE_BUG;
}
enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs)
{
enum bug_trap_type ret;
bool rcu = false;
rcu = warn_rcu_enter();
ret = __report_bug(bugaddr, regs);
warn_rcu_exit(rcu);
return ret;
}
static void clear_once_table(struct bug_entry *start, struct bug_entry *end)
{
struct bug_entry *bug;