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Date: Mon, 05 Jan 2009 11:23:33 +0800 From: Li Zefan <lizf@...fujitsu.com> To: LKML <linux-kernel@...r.kernel.org> CC: Andrew Morton <akpm@...ux-foundation.org>, Paul Menage <menage@...gle.com>, Al Viro <viro@...IV.linux.org.uk> Subject: [cgroup or VFS ?] WARNING: at fs/namespace.c:636 mntput_no_expire+0xac/0xf2() Thread 1: for ((; ;)) { mount -t cgroup -o cpuset xxx /mnt > /dev/null 2>&1 mkdir /mnt/0 > /dev/null 2>&1 rmdir /mnt/0 > /dev/null 2>&1 umount /mnt > /dev/null 2>&1 } Thread 2: for ((; ;)) { mount -t cpuset xxx /mnt > /dev/null 2>&1 umount /mnt > /dev/null 2>&1 } (Note: Again it is irrelevant which cgroup subsys is used.) After a while this showed up: ------------[ cut here ]------------ WARNING: at fs/namespace.c:636 mntput_no_expire+0xac/0xf2() Hardware name: Aspire SA85 Modules linked in: bridge stp llc autofs4 dm_mirror dm_region_hash dm_log dm_mod r8169 parport_pc mii parport sg button sata_sis pata_sis ata_generic libata sd_mod scsi_mod ext3 jbd mbcache uhci_hcd ohci_hcd ehci_hcd [last unloaded: scsi_wait_scan] Pid: 4745, comm: umount Not tainted 2.6.28 #479 Call Trace: [<c042bbe3>] warn_slowpath+0x79/0x8f [<c044babf>] ? __lock_acquire+0x69a/0x700 [<c04ae44e>] ? mntput_no_expire+0x79/0xf2 [<c04ae481>] mntput_no_expire+0xac/0xf2 [<c04ae968>] sys_umount+0x26a/0x2b1 [<c04ae9c1>] sys_oldumount+0x12/0x14 [<c0403251>] sysenter_do_call+0x12/0x31 ---[ end trace 79d0ab4bef01333f ]--- The WARNING is: WARN_ON(atomic_read(&mnt->__mnt_writers)); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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