[RFC PATCH 2/2] futex: hack: Add debug delays
flat view
STALE235d
From: André Almeida <andrealmeid@igalia.com>
Date: 2026-02-20 20:27:40
Also in:
lkml
Subsystem:
futex subsystem, the rest · Maintainers:
Thomas Gleixner, Ingo Molnar, Linus Torvalds
Add delays to handle_futex_death() to increase the chance of hitting the race
condition.
Signed-off-by: André Almeida <andrealmeid@igalia.com>
---
kernel/futex/core.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/kernel/futex/core.c b/kernel/futex/core.c
index cf7e610eac42..d409b3368cb3 100644
--- a/kernel/futex/core.c
+++ b/kernel/futex/core.c@@ -44,6 +44,7 @@ #include <linux/prctl.h> #include <linux/mempolicy.h> #include <linux/mmap_lock.h> +#include <linux/delay.h> #include "futex.h" #include "../locking/rtmutex_common.h"
@@ -1095,6 +1096,12 @@ static int handle_futex_death(u32 __user *uaddr, struct task_struct *curr, * does not guarantee R/W access. If that fails we * give up and leave the futex locked. */ + + if (!strcmp(current->comm, "robust_bug")) { + printk("robust_bug is exiting\n"); + msleep(500); + } + if ((err = futex_cmpxchg_value_locked(&nval, uaddr, uval, mval))) { switch (err) { case -EFAULT:
@@ -1112,6 +1119,9 @@ static int handle_futex_death(u32 __user *uaddr, struct task_struct *curr, } } + if (!strcmp(current->comm, "robust_bug")) + printk("memory written\n"); + if (nval != uval) goto retry;
--
2.53.0