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Date: Sat, 18 Mar 2006 12:54:38 -0800
From: Andrew Morton <akpm@osdl.org>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: linux-kernel@vger.kernel.org, Neil Brown <neilb@cse.unsw.edu.au>
Subject: Re: 2.6.16-rc6-mm2
Message-Id: <20060318125438.420f0608.akpm@osdl.org>
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"Rafael J. Wysocki" <rjw@sisk.pl> wrote:
>
> On Saturday 18 March 2006 13:40, Andrew Morton wrote:
>  > 
>  > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.16-rc6/2.6.16-rc6-mm2/
> 
>  I get the following oops from it 100% of the time (on boot):
> 
>  Trying to free ramdisk memory ... ----------- [cut here ] --------- [please bite here ] ---------
>  Kernel BUG at fs/buffer.c:1629
>  invalid opcode: 0000 [1] PREEMPT
>  last sysfs file: /block/hdc/range
>  CPU 0
>  Modules linked in:
>  Pid: 1, comm: swapper Not tainted 2.6.16-rc6-mm2 #16
>  RIP: 0010:[<ffffffff80280d9a>] <ffffffff80280d9a>{block_invalidatepage+202}
>  RSP: 0000:ffff81005ff07ac8  EFLAGS: 00010246
>  RAX: 0000000000000000 RBX: ffff810037c09138 RCX: ffff810037c09228
>  RDX: 0000000000000000 RSI: ffff81005ff07a88 RDI: 0000000000000000
>  RBP: ffff81005ff07af8 R08: 0000000000000002 R09: ffff81005ff07a99
>  R10: ffff810037c09138 R11: 0000000000000010 R12: ffff810037c09138
>  R13: 0000000000001000 R14: ffff810037c09138 R15: ffff810001c34e28
>  FS:  0000000000000000(0000) GS:ffffffff80690000(0000) knlGS:0000000000000000
>  CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
>  CR2: 00002afbe89a3000 CR3: 000000005fe36000 CR4: 00000000000006e0
>  Process swapper (pid: 1, threadinfo ffff81005ff06000, task ffff81005ff05530)
>  Stack: 0000000000000000 ffff810001c34e28 0000000000000002 0000000000000001
>         ffff810037df47e0 ffffffffffffffff ffff81005ff07b08 ffffffff8027f7b3
>         ffff81005ff07b28 ffffffff802610d5
>  Call Trace: <ffffffff8027f7b3>{do_invalidatepage+35}
>         <ffffffff802610d5>{truncate_complete_page+37} <ffffffff8026154f>{truncate_inode_pages_range+207}
>         <ffffffff802617c0>{truncate_inode_pages+16} <ffffffff803bac96>{rd_ioctl+86}

Yeah, ramdisk does strange things.

That's two.  I guess I need to see if Neil left any other little timebombs
in there for us ;)

--- devel/fs/buffer.c~make-address_space_operations-invalidatepage-return-void-fix	2006-03-18 12:52:37.000000000 -0800
+++ devel-akpm/fs/buffer.c	2006-03-18 12:53:04.000000000 -0800
@@ -1624,10 +1624,8 @@ void block_invalidatepage(struct page *p
 	 * The get_block cached value has been unconditionally invalidated,
 	 * so real IO is not possible anymore.
 	 */
-	if (offset == 0) {
-		int ret = try_to_release_page(page, 0);
-		BUG_ON(!ret);
-	}
+	if (offset == 0)
+		try_to_release_page(page, 0);
 out:
 	return;
 }
_

-
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