diff options
Diffstat (limited to 'kernel/kcsan/report.c')
| -rw-r--r-- | kernel/kcsan/report.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/kernel/kcsan/report.c b/kernel/kcsan/report.c index ac5f8345bae9..9d07e175de0f 100644 --- a/kernel/kcsan/report.c +++ b/kernel/kcsan/report.c @@ -308,6 +308,9 @@ static void print_verbose_info(struct task_struct *task) if (!task) return; + /* Restore IRQ state trace for printing. */ + kcsan_restore_irqtrace(task); + pr_err("\n"); debug_show_held_locks(task); print_irqtrace_events(task); @@ -606,10 +609,11 @@ void kcsan_report(const volatile void *ptr, size_t size, int access_type, goto out; /* - * With TRACE_IRQFLAGS, lockdep's IRQ trace state becomes corrupted if - * we do not turn off lockdep here; this could happen due to recursion - * into lockdep via KCSAN if we detect a race in utilities used by - * lockdep. + * Because we may generate reports when we're in scheduler code, the use + * of printk() could deadlock. Until such time that all printing code + * called in print_report() is scheduler-safe, accept the risk, and just + * get our message out. As such, also disable lockdep to hide the + * warning, and avoid disabling lockdep for the rest of the kernel. */ lockdep_off(); |