Re: [Xen-devel] Xen Ballon Bug in 2.6.27-git11

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

viets@xxxxxxx wrote:
> Hello,
>
> I'm unsure where I sent a bug report for linux kernel 2.6.27-git11.
>
> If I'm use the attached config, I get the kernel panic shown in the
> attached dmesg.
>
> Hope this can be fixed.
>   
> xen_balloon: Initialising balloon driver.
> sysfs: duplicate filename 'memory' can not be created
> ------------[ cut here ]------------
> WARNING: at fs/sysfs/dir.c:465 sysfs_add_one+0x53/0x60()
> Pid: 1, comm: swapper Not tainted 2.6.26-git11 #2
>
> Call Trace:
>  [<ffffffff8023285f>] warn_on_slowpath+0x5f/0x90
>  [<ffffffff8023390e>] printk+0x4e/0x60
>  [<ffffffff8027f3d4>] kmem_cache_alloc+0x64/0xc0
>  [<ffffffff802cf450>] sysfs_ilookup_test+0x0/0x10
>  [<ffffffff802cf6f9>] sysfs_find_dirent+0x29/0x40
>  [<ffffffff802cf734>] __sysfs_add_one+0x24/0xa0
>  [<ffffffff802cf803>] sysfs_add_one+0x53/0x60
>  [<ffffffff802cfe50>] create_dir+0x60/0xb0
>  [<ffffffff8051c940>] balloon_init+0x0/0x1e0
>  [<ffffffff802cfed1>] sysfs_create_dir+0x31/0x50
>  [<ffffffff80370233>] kobject_add_internal+0xe3/0x1c0
>  [<ffffffff8051c940>] balloon_init+0x0/0x1e0
>  [<ffffffff8037033c>] kset_register+0x2c/0x50
>  [<ffffffff8051c9f0>] balloon_init+0xb0/0x1e0
>  [<ffffffff8051c4a0>] genhd_device_init+0x0/0x60
>  [<ffffffff8050a9e8>] kernel_init+0x128/0x310
>  [<ffffffff8020b8e0>] xen_load_sp0+0x90/0xc0
>  [<ffffffff8020bf65>] xen_mc_flush+0xc5/0x190
>  [<ffffffff8022e643>] finish_task_switch+0x43/0xc0
>  [<ffffffff80212079>] child_rip+0xa/0x11
>  [<ffffffff80211388>] retint_restore_args+0x5/0x20
>  [<ffffffff803799a0>] dummycon_dummy+0x0/0x10
>  [<ffffffff803799a0>] dummycon_dummy+0x0/0x10
>  [<ffffffff8021206f>] child_rip+0x0/0x11
>
> ---[ end trace 4eaa2a86a8e2da22 ]---
> kobject_add_internal failed for memory with -EEXIST, don't try to register 
> things with the same name in the same directory.
> Pid: 1, comm: swapper Tainted: G        W 2.6.26-git11 #2
>
> Call Trace:
>  [<ffffffff803702c3>] kobject_add_internal+0x173/0x1c0
>  [<ffffffff8051c940>] balloon_init+0x0/0x1e0
>  [<ffffffff8037033c>] kset_register+0x2c/0x50
>  [<ffffffff8051c9f0>] balloon_init+0xb0/0x1e0
>  [<ffffffff8051c4a0>] genhd_device_init+0x0/0x60
>  [<ffffffff8050a9e8>] kernel_init+0x128/0x310
>  [<ffffffff8020b8e0>] xen_load_sp0+0x90/0xc0
>  [<ffffffff8020bf65>] xen_mc_flush+0xc5/0x190
>  [<ffffffff8022e643>] finish_task_switch+0x43/0xc0
>  [<ffffffff80212079>] child_rip+0xa/0x11
>  [<ffffffff80211388>] retint_restore_args+0x5/0x20
>  [<ffffffff803799a0>] dummycon_dummy+0x0/0x10
>  [<ffffffff803799a0>] dummycon_dummy+0x0/0x10
>  [<ffffffff8021206f>] child_rip+0x0/0x11
>   
Thanks for the report.  I was looking at the balloon driver just 
yesterday and fixed this particular error up.  I'll post a balloon 
driver update shortly.
Thanks,
   J

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