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Date: Tue, 27 Apr 2010 22:53:01 +0200 (CEST)
From: Thomas Gleixner <tglx@linutronix.de>
To: "Luis Claudio R. Goncalves" <lclaudio@uudg.org>
cc: rt-users <linux-rt-users@vger.kernel.org>,
       LKML <linux-kernel@vger.kernel.org>, John Stultz <johnstul@us.ibm.com>
Subject: Re: 2.6.33.3-rt16: WARNING: at fs/namespace.c:1197
 umount_tree+0x127/0x175()
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On Tue, 27 Apr 2010, Luis Claudio R. Goncalves wrote:

CC'ed John

> Hello!
> 
> I see this warning during system boot and it hangs while loading X and even
> though I can change from one VT to another (ctrl+alt+F<num>) no keys
> pressed seem to have any effect.
> 
> ------------[ cut here ]------------
> WARNING: at fs/namespace.c:1197 umount_tree+0x127/0x175()
> Hardware name: KQ260AA-AC4 a6540br
> Modules linked in: i915 drm_kms_helper drm video output ipt_MASQUERADE iptable_nat nf_nat bridge stp llc vfat fat sunrpc ipv6 xt_physdev ipt_REJECT xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_state iptable_filter ip_tables x_tables dm_mirror dm_region_hash dm_log dm_multipath scsi_dh dm_mod kvm_intel kvm uinput tuner_simple tuner_types wm8775 tda9887 tda8290 tuner snd_hda_codec_realtek cx25840 snd_hda_intel snd_hda_codec snd_hwdep snd_seq usb_storage snd_seq_device ivtv snd_pcm i2c_algo_bit cx2341x v4l2_common videodev snd_timer firewire_ohci snd firewire_core v4l1_compat v4l2_compat_ioctl32 ir_common ir_core i2c_i801 soundcore crc_itu_t tveeprom i2c_core iTCO_wdt snd_page_alloc sr_mod intel_agp iTCO_vendor_support serio_raw pcspkr sg button r8169 mii cdrom ahci libata sd_mod scsi_mod crc_t10dif ext3 jbd mbcache uhci_hcd ohci_hcd ehci_hcd [last unloaded: microcode]
> Pid: 2267, comm: libvirtd Not tainted 2.6.33.3-rt16 #28
> Call Trace:
> [<ffffffff81040e3b>] warn_slowpath_common+0x7c/0x94
> [<ffffffff81040e67>] warn_slowpath_null+0x14/0x16
> [<ffffffff81115a7f>] umount_tree+0x127/0x175
> [<ffffffff81116d1d>] put_mnt_ns+0xc2/0xf0
> [<ffffffff81061a1d>] free_nsproxy+0x1f/0x86
> [<ffffffff81061abc>] switch_task_namespaces+0x38/0x3c
> [<ffffffff81061ad0>] exit_task_namespaces+0x10/0x12
> [<ffffffff81044ae3>] do_exit+0x595/0x738
> [<ffffffff81360626>] ? rt_mutex_unlock+0xe/0x10
> [<ffffffff81360db8>] ? lockdep_sys_exit_thunk+0x35/0x67
> [<ffffffff81044d10>] do_group_exit+0x8a/0xb9
> [<ffffffff81044d56>] sys_exit_group+0x17/0x1b
> [<ffffffff81002d32>] system_call_fastpath+0x16/0x1b
> ---[ end trace 348d259112b3e793 ]---
> 
> 
> The warning comes from:
> 
> 	WARN_ON(!(p->mnt_flags & MNT_MOUNTED));
> 
> Regards,
> Luis
> -- 
> [ Luis Claudio R. Goncalves                    Bass - Gospel - RT ]
> [ Fingerprint: 4FDD B8C4 3C59 34BD 8BE9  2696 7203 D980 A448 C8F8 ]
> 
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