Attachment 309042 Details for Bug 446777 – add debug output for lookup_pi_state

[patch] add debug output for lookup_pi_state

futex-debug2.patch (text/plain), 1.49 KB, created by Thomas Gleixner on 2008-06-12 08:14:28 UTC

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Creator: Thomas Gleixner

Created: 2008-06-12 08:14:28 UTC

Size: 1.49 KB

patch

obsolete

>---
> kernel/futex.c |   31 ++++++++++++++++++++++++++++---
> 1 file changed, 28 insertions(+), 3 deletions(-)
>
>Index: linux-2.6.24/kernel/futex.c
>===================================================================
>--- linux-2.6.24.orig/kernel/futex.c
>+++ linux-2.6.24/kernel/futex.c
>@@ -542,9 +542,34 @@ lookup_pi_state(u32 uval, struct futex_h
> 			if (unlikely(!pi_state))
> 				return -EINVAL;
> 
>-			WARN_ON(!atomic_read(&pi_state->refcount));
>-			WARN_ON(pid && pi_state->owner &&
>-				pi_state->owner->pid != pid);
>+			if (!atomic_read(&pi_state->refcount)) {
>+				printk(KERN_INFO "lookup_pi: refc = 0 "
>+				       "uval 0x%08x pid %d ctid %d "
>+				       "keyw 0x%lx keyp %p keyo %d "
>+				       "pio %p piop %d\n",
>+				       (unsigned int) uval, pid,
>+				       task_pid_vnr(current),
>+				       this->key.both.word,
>+				       this->key.both.ptr,
>+				       this->key.both.offset,
>+				       pi_state->owner,
>+				       pi_state->owner ? pi_state->owner->pid : 0);
>+			}
>+
>+			if (pid && pi_state->owner &&
>+			    pi_state->owner->pid != pid) {
>+				printk(KERN_INFO "lookup_pi: pid mismatch "
>+				       "uval 0x%08x pid %d ctid %d "
>+				       "keyw 0x%lx keyp %p keyo %d "
>+				       "pio %p piop %d\n",
>+				       (unsigned int) uval, pid,
>+				       task_pid_vnr(current),
>+				       this->key.both.word,
>+				       this->key.both.ptr,
>+				       this->key.both.offset,
>+				       pi_state->owner,
>+				       pi_state->owner->pid);
>+			}
> 
> 			atomic_inc(&pi_state->refcount);
> 			*ps = pi_state;

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