linux-kernel - Re: 2.6.20-mm1

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Date:	Thu, 15 Feb 2007 14:02:32 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: 2.6.20-mm1

On Thu, 15 Feb 2007 15:37:20 +0100
Michal Piotrowski <michal.k.k.piotrowski@...il.com> wrote:

> Andrew Morton napisa__(a):
> > Temporarily at
> > 
> >   http://userweb.kernel.org/~akpm/2.6.20-mm1/
> > 
> > Will appear later at
> > 
> >  ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.20/2.6.20-mm1/
> > 
> > 
> 
> BUG: sleeping function called from invalid context at /mnt/md0/devel/linux-mm/mm/slab.c:3043
> in_atomic():1, irqs_disabled():0
> 1 lock held by artsd/3819:
>  #0:  (&new->lock){--..}, at: [<c01d5b7c>] ipc_lock+0x35/0x4f
>  [<c0105312>] show_trace_log_lvl+0x1a/0x2f
>  [<c0105a25>] show_trace+0x12/0x14
>  [<c0105ae7>] dump_stack+0x16/0x18
>  [<c011db4a>] __might_sleep+0xc9/0xcf
>  [<c017c37a>] kmem_cache_zalloc+0x28/0xe5
>  [<c01d8c7d>] do_shmat+0x111/0x372
>  [<c0109151>] sys_ipc+0x148/0x1b5
>  [<c010432c>] syscall_call+0x7/0xb

That's shm-make-sysv-ipc-shared-memory-use-stacked-files.patch, brought to
us by Eric-who-hasnt-read-Documentation/SubmitChecklist.

Like this, I guess:

diff -puN ipc/shm.c~shm-make-sysv-ipc-shared-memory-use-stacked-files-fix ipc/shm.c
--- a/ipc/shm.c~shm-make-sysv-ipc-shared-memory-use-stacked-files-fix
+++ a/ipc/shm.c
@@ -818,7 +818,7 @@ long do_shmat(int shmid, char __user *sh
 	int acc_mode;
 	void *user_addr;
 	struct ipc_namespace *ns;
-	struct shm_file_data *sfd;
+	struct shm_file_data *sfd = NULL;
 	mode_t f_mode;
 
 	if (shmid < 0) {
@@ -856,6 +856,8 @@ long do_shmat(int shmid, char __user *sh
 		acc_mode |= S_IXUGO;
 	}
 
+	sfd = kzalloc(sizeof(*sfd), GFP_KERNEL);
+
 	/*
 	 * We cannot rely on the fs check since SYSV IPC does have an
 	 * additional creator id...
@@ -879,13 +881,12 @@ long do_shmat(int shmid, char __user *sh
 		goto out_unlock;
 
 	err = -ENOMEM;
-	sfd = kzalloc(sizeof(*sfd), GFP_KERNEL);
 	if (!sfd)
 		goto out_unlock;
 
 	file = get_empty_filp();
 	if (!file)
-		goto out_free;
+		goto out_unlock;
 
 	file->f_op = &shm_file_operations;
 	file->private_data = sfd;
@@ -939,9 +940,8 @@ invalid:
 	if (IS_ERR(user_addr))
 		err = PTR_ERR(user_addr);
 out:
-	return err;
-out_free:
 	kfree(sfd);
+	return err;
 out_unlock:
 	shm_unlock(shp);
 	goto out;
_

-
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