linux-kernel - Re: [BUG] 2.6.24-rc3-mm2 kernel bug on nfs & cifs mounted partitions

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Message-ID: <20071129121001.GD16558@duck.suse.cz>
Date:	Thu, 29 Nov 2007 13:10:01 +0100
From:	Jan Kara <jack@...e.cz>
To:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, samba-technical@...ts.samba.org,
	nfs@...ts.sourceforge.net, linuxppc-dev@...abs.org,
	Andy Whitcroft <apw@...dowen.org>,
	Balbir Singh <balbir@...ibm.com>
Subject: Re: [BUG] 2.6.24-rc3-mm2 kernel bug on nfs & cifs mounted partitions

On Thu 29-11-07 17:27:08, Kamalesh Babulal wrote:
> Andrew Morton wrote:
> > On Thu, 29 Nov 2007 14:30:14 +0530 Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com> wrote:
> > 
> >> Hi Andrew,
> >>
> >> While running file system stress on nfs and cifs mounted partitions, the machine
> >> drops to xmon
> >>
> >> 1:mon> e
> >> cpu 0x1: Vector: 300 (Data Access) at [c000000080a9f880]
> >>     pc: c0000000001392c8: .inotify_inode_queue_event+0x50/0x158
> >>     lr: c0000000001074d0: .vfs_link+0x204/0x298
> >>     sp: c000000080a9fb00
> >>    msr: 8000000000009032
> >>    dar: 280 
> >>  dsisr: 40010000
> >>   current = 0xc0000000c8e6f670
> >>   paca    = 0xc000000000512c00
> >>     pid   = 2848, comm = fsstress
> >> 1:mon> t
> >> [c000000080a9fbd0] c0000000001074d0 .vfs_link+0x204/0x298
> >> [c000000080a9fc70] c00000000010b6e0 .sys_linkat+0x134/0x1b4
> >> [c000000080a9fe30] c00000000000872c syscall_exit+0x0/0x40
> >> --- Exception: c00 (System Call) at 000000000ff1bdfc
> >> SP (ffeaed10) is in userspace
> >> 1:mon> r
> >> R00 = c0000000001074d0   R16 = 0000000000000000
> >> R01 = c000000080a9fb00   R17 = 0000000000000000
> >> R02 = c00000000060c380   R18 = 0000000000000000
> >> R03 = 0000000000000000   R19 = 0000000000000000
> >> R04 = 0000000000000004   R20 = 0000000000000000
> >> R05 = 0000000000000000   R21 = 0000000000000000
> >> R06 = 0000000000000000   R22 = 0000000000000000
> >> R07 = 0000000000000000   R23 = 0000000000000004
> >> R08 = 0000000000000000   R24 = 0000000000000280
> >> R09 = 0000000000000000   R25 = fffffffffffff000
> >> R10 = 0000000000000001   R26 = c000000082827790
> >> R11 = c0000000003963e8   R27 = c0000000828275a0
> >> R12 = d000000000deec78   R28 = 0000000000000000
> >> R13 = c000000000512c00   R29 = c00000007b18fcf0
> >> R14 = 0000000000000000   R30 = c0000000005bc088
> >> R15 = 0000000000000000   R31 = 0000000000000000
> >> pc  = c0000000001392c8 .inotify_inode_queue_event+0x50/0x158
> >> lr  = c0000000001074d0 .vfs_link+0x204/0x298
> >> msr = 8000000000009032   cr  = 24000882
> >> ctr = c0000000003963e8   xer = 0000000000000000   trap =  300 
> >> dar = 0000000000000280   dsisr = 40010000
> >>
> >>
> >> The gdb output shows 
> >>
> >> 0xc0000000001076d4 is in vfs_symlink (include/linux/fsnotify.h:108).
> >> 103      * fsnotify_create - 'name' was linked in
> >> 104      */  
> >> 105     static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
> >> 106     {   
> >> 107             inode_dir_notify(inode, DN_CREATE);
> >> 108             inotify_inode_queue_event(inode, IN_CREATE, 0, dentry->d_name.name,
> >> 109                                       dentry->d_inode);
> >> 110             audit_inode_child(dentry->d_name.name, dentry, inode);
> >> 111     }   
> >> 112
> >>
> > 
> > If it is reproducible can you please try reverting
> > inotify-send-in_attrib-events-when-link-count-changes.patch?
> 
> Hi Andrew,
> 
> reverting the patch inotify-send-in_attrib-events-when-link-count-changes.patch, the 
> bug is not reproduced.
  OK, thanks for testing. I was trying to reproduce the problem locally but
without success so far - I guess it's either NFS or CIFS which makes the
problem appear. I'll investigate more.

									Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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