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Message-ID: <17735.4830.610969.866898@cse.unsw.edu.au>
Date: Tue, 31 Oct 2006 20:09:50 +1100
From: Neil Brown <neilb@...e.de>
To: Andrew Morton <akpm@...l.org>
Cc: jens.axboe@...cle.com, linux-raid@...r.kernel.org,
linux-kernel@...r.kernel.org, gregkh@...e.de
Subject: Re: [PATCH 002 of 6] md: Change lifetime rules for 'md' devices.
On Tuesday October 31, akpm@...l.org wrote:
> On Tue, 31 Oct 2006 17:00:51 +1100
> NeilBrown <neilb@...e.de> wrote:
>
> > Currently md devices are created when first opened and remain in existence
> > until the module is unloaded.
> > This isn't a major problem, but it somewhat ugly.
> >
> > This patch changes the lifetime rules so that an md device will
> > disappear on the last close if it has no state.
>
> This kills the G5:
>
>
> EXT3-fs: recovery complete.
> EXT3-fs: mounted filesystem with ordered data mode.
> Oops: Kernel access of bad area, sig: 11 [#1]
> SMP NR_CPUS=4
> Modules linked in:
> NIP: C0000000001A31B8 LR: C00000000018E5DC CTR: C0000000001A3404
> REGS: c0000000017ff4a0 TRAP: 0300 Not tainted (2.6.19-rc4-mm1)
> MSR: 9000000000009032 <EE,ME,IR,DR> CR: 84000048 XER: 00000000
> DAR: 6B6B6B6B6B6B6BB3, DSISR: 0000000040000000
> TASK = c00000000ff2b7f0[1899] 'nash' THREAD: c0000000017fc000 CPU: 1
> GPR00: 0000000000000008 C0000000017FF720 C0000000006B26D0 6B6B6B6B6B6B6B7B
..
> NIP [C0000000001A31B8] .kobject_uevent+0xac/0x55c
> LR [C00000000018E5DC] .__elv_unregister_queue+0x20/0x44
> Call Trace:
> [C0000000017FF720] [C000000000562508] read_pipe_fops+0xd0/0xd8 (unreliable)
> [C0000000017FF840] [C00000000018E5DC] .__elv_unregister_queue+0x20/0x44
> [C0000000017FF8D0] [C000000000195548] .blk_unregister_queue+0x58/0x9c
> [C0000000017FF960] [C00000000019683C] .unlink_gendisk+0x1c/0x50
> [C0000000017FF9F0] [C000000000122840] .del_gendisk+0x98/0x22c
I'm guessing we need
diff .prev/block/elevator.c ./block/elevator.c
--- .prev/block/elevator.c 2006-10-31 20:06:22.000000000 +1100
+++ ./block/elevator.c 2006-10-31 20:06:40.000000000 +1100
@@ -926,7 +926,7 @@ static void __elv_unregister_queue(eleva
void elv_unregister_queue(struct request_queue *q)
{
- if (q)
+ if (q && q->elevator)
__elv_unregister_queue(q->elevator);
}
Jens? md never registers and elevator for its queue.
>
> Also, it'd be nice to enable CONFIG_MUST_CHECK and take a look at a few
> things...
>
> drivers/md/md.c: In function `bind_rdev_to_array':
> drivers/md/md.c:1379: warning: ignoring return value of `kobject_add', declared with attribute warn_unused_result
> drivers/md/md.c:1385: warning: ignoring return value of `sysfs_create_link', declared with attribute warn_unused_result
> drivers/md/md.c: In function `md_probe':
> drivers/md/md.c:2986: warning: ignoring return value of `kobject_register', declared with attribute warn_unused_result
> drivers/md/md.c: In function `do_md_run':
> drivers/md/md.c:3135: warning: ignoring return value of `sysfs_create_group', declared with attribute warn_unused_result
> drivers/md/md.c:3150: warning: ignoring return value of `sysfs_create_link', declared with attribute warn_unused_result
> drivers/md/md.c: In function `md_check_recovery':
> drivers/md/md.c:5446: warning: ignoring return value of `sysfs_create_link', declared with attribute warn_unused_result
I guess... I saw mail a while ago about why we really should be
checking those. I'll have to dig it up again.
NeilBrown
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