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Subject[PATCH] sigwait eats blocked default-ignore signals


While a signal is blocked, it must be posted even if its action is
SIG_IGN or is SIG_DFL with the default action to ignore. This works
right most of the time, but is broken when a sigwait (rt_sigtimedwait)
is in progress. This changes the early-discard check to respect
real_blocked. ~blocked is the set to check for "should wake up now",
but ~(blocked|real_blocked) is the set for "blocked" semantics as
defined by POSIX.

Signed-off-by: Roland McGrath <>
kernel/signal.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index 0ac614a..9b22790 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -55,7 +55,7 @@ static int sig_ignored(struct task_struct *t, int sig)
* signal handler may change by the time it is
* unblocked.
- if (sigismember(&t->blocked, sig))
+ if (sigismember(&t->blocked, sig) || sigismember(&t->real_blocked, sig))
return 0;

/* Is it explicitly or implicitly ignored? */
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