linux-kernel - Re: [git pull] vfs fixes

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Date:	Fri, 26 Sep 2014 22:46:14 +0200
From:	Joachim Eastwood <manabian@...il.com>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [git pull] vfs fixes

On 14 September 2014 21:47, Al Viro <viro@...iv.linux.org.uk> wrote:
> double iput() on failure exit in lustre, racy removal of spliced dentries
> from ->s_anon in __d_materialise_dentry() plus a bunch of assorted RCU pathwalk
> fixes.  Please, pull from the usual place -
> git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git for-linus
>
> Shortlog:
> Al Viro (5):
>       [fix] lustre: d_make_root() does iput() on dentry allocation failure
>       move the call of __d_drop(anon) into __d_materialise_unique(dentry, anon)
>       fix bogus read_seqretry() checks introduced in b37199e
>       don't bugger nd->seq on set_root_rcu() from follow_dotdot_rcu()
>       be careful with nd->inode in path_init() and follow_dotdot_rcu()

Hi,

Commit 4023bfc9f351a7994 "be careful with nd->inode in path_init() and
follow_dotdot_rcu(), seem to hang my ARM no-MMU platform when mounting
the ramdisk.

3.17-rc4 - works
3.17-rc5 - works with 4023bfc9f351a7994 reverted.

Boot log with from rc5:
[ 5.810000] TCP: cubic registered
[ 5.820000] NET: Registered protocol family 17
[ 5.860000] lpc2k-rtc 40046000.rtc: hctosys: unable to read the hardware clock
[ 5.910000] mmc_host mmc0: Bus speed (slot 0) = 12000000Hz (slot req
25000000Hz, actual 12000000HZ div = 0)
[ 5.930000] mmc0: new SDHC card at address 0007
[ 5.950000] mmcblk0: mmc0:0007 SD08G 7.42 GiB
[ 6.150000] clk: Not disabling unused clocks
[ 81.240000] random: nonblocking pool is initialized

And there it just hangs it seems.


With patch reverted
[ 5.810000] TCP: cubic registered
[ 5.820000] NET: Registered protocol family 17
[ 5.850000] lpc2k-rtc 40046000.rtc: hctosys: unable to read the hardware clock
[ 6.100000] clk: Not disabling unused clocks
[ 6.110000] RAMDISK: gzip image found at block 0
[ 9.590000] VFS: Mounted root (ext2 filesystem) readonly on device 1:0.
[ 9.600000] devtmpfs: mounted
[ 9.610000] Freeing unused kernel memory: 68K (281e5000 - 281f6000)

And then user space starts.

This is an ARM Cortex-M4 no-MMU platform that is not yet upstream.

regards,
Joachim Eastwood
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