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Message-ID: <20090709104202.GA3434@localdomain.by>
Date: Thu, 9 Jul 2009 13:42:02 +0300
From: Sergey Senozhatsky <sergey.senozhatsky@...l.by>
To: Catalin Marinas <catalin.marinas@....com>
Cc: Pekka Enberg <penberg@...helsinki.fi>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: kmemeleak BUG: lock held when returning to user space!
Hello.
kernel: [ 149.507103] ================================================
kernel: [ 149.507113] [ BUG: lock held when returning to user space! ]
kernel: [ 149.507119] ------------------------------------------------
kernel: [ 149.507127] cat/3279 is leaving the kernel with locks still held!
kernel: [ 149.507135] 1 lock held by cat/3279:
kernel: [ 149.507141] #0: (scan_mutex){+.+.+.}, at: [<c110707c>] kmemleak_open+0x4c/0x80
problem is here:
static int kmemleak_open(struct inode *inode, struct file *file)
{
int ret = 0;
if (!atomic_read(&kmemleak_enabled))
return -EBUSY;
ret = mutex_lock_interruptible(&scan_mutex);
if (ret < 0)
goto out;
if (file->f_mode & FMODE_READ) {
ret = seq_open(file, &kmemleak_seq_ops);
if (ret < 0)
goto scan_unlock;
}
>>- return ret;
scan_unlock:
mutex_unlock(&scan_mutex);
out:
return ret;
}
we should not return before mutex_unlock(&scan_mutex);
Sergey
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