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From: Azat Khuzhin <a3at.mail@gmail.com>
To: Guoqing Jiang <GQJiang@suse.com>
Cc: "Kernel.org-Linux-RAID" <linux-raid@vger.kernel.org>, neilb@suse.de
Subject: Re: BUG: unable to handle kernel NULL pointer dereference at sysfs_do_create_link_sd (after mdadm)
Date: Wed, 15 Apr 2015 11:47:19 +0300	[thread overview]
Message-ID: <20150415084719.GM25394@azat> (raw)
In-Reply-To: <552DD097.9010504@suse.com>

On Wed, Apr 15, 2015 at 10:44:39AM +0800, Guoqing Jiang wrote:
> Azat Khuzhin wrote:
> > $ git describe
> > v4.0-2620-gb79013b
> >
> > During setting up partitions with mdadm, mdadm hung, after attaching to mdadm with strace I got next:
> >
> > # pgrep mdadm | xargs strace -fp
> > Process 27389 attached - interrupt to quit
> > unlink("/dev/.tmp.md.27389:9:127")      = 0
> > mknod("/tmp/.tmp.md.27389:9:127", S_IFBLK|0600, makedev(9, 127)) = 0
> > open("/tmp/.tmp.md.27389:9:127", O_RDWR|O_EXCL|O_DIRECT) <-- *hung*
> >
> > After, I looked into dmesg, and found this:
> > [ 9627.630018] ------------[ cut here ]------------
> > [ 9627.630029] WARNING: CPU: 18 PID: 3330 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x5a/0x70()
> > [ 9627.630032] sysfs: cannot create duplicate filename '/devices/virtual/bdi/9:127'
> >   
> sysfs complains about duplicate filename, maybe you tried to create the
> array with same node.

Yes, my steps was close to this:
$ mdadm --create /dev/md/foo --raid-devices=2 /dev/sda /dev/sdb
$ mdadm --stop --scan
$ mdadm --create /dev/md/foo --raid-devices=2 /dev/sda /dev/sdb

But it is not always reproduces.

Anyway the most important is not WARNING but BUG (also after that BUG
you can't umount all file systems normally -- i.e. on reboot).

  reply	other threads:[~2015-04-15  8:47 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-04-14 17:15 BUG: unable to handle kernel NULL pointer dereference at sysfs_do_create_link_sd (after mdadm) Azat Khuzhin
2015-04-15  2:44 ` Guoqing Jiang
2015-04-15  8:47   ` Azat Khuzhin [this message]
2015-04-23  6:05 ` Bisected, with rfc/patch - was " NeilBrown
2015-04-23  7:37   ` Christoph Hellwig
2015-04-23  8:03     ` NeilBrown
2015-04-23 16:10       ` Christoph Hellwig
2015-04-24  2:09         ` NeilBrown
2015-04-24  8:27           ` Christoph Hellwig
2015-04-27  4:12   ` [PATCH -stable] block: destroy bdi before blockdev is unregistered NeilBrown
2015-04-27 13:03     ` Christoph Hellwig
2015-04-27 16:27     ` Jens Axboe
2015-04-28 16:41     ` Mike Snitzer
2015-04-28 21:25       ` NeilBrown
2015-04-29 13:35         ` Christoph Hellwig
2015-04-29 16:02           ` Peter Zijlstra
2015-04-30  0:06             ` NeilBrown
2015-04-30  0:32             ` [PATCH stable] block: discard bdi_unregister() in favour of bdi_destroy() NeilBrown
2015-04-30  8:35               ` Peter Zijlstra
2015-05-06 16:11               ` [dm-devel] " Dan Williams
2015-05-08  5:09                 ` [PATCH v2] " NeilBrown

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