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Date: Mon, 21 Mar 2011 08:30:23 +0300 From: Alexander Beregalov <a.beregalov@...il.com> To: Al Viro <viro@...iv.linux.org.uk> Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: 2.6.39-rc0: umount tmpfs hangs On 21 March 2011 06:39, Al Viro <viro@...iv.linux.org.uk> wrote: > On Mon, Mar 21, 2011 at 05:24:08AM +0300, Alexander Beregalov wrote: >> Hi >> >> kernel is 2.6.38-06507-ga952baa >> >> /etc/init.d/swap stop >> runs >> umount -a -t tmpfs >> >> which is hangs at >> >> $cat /proc/4453/stack >> [<c1066332>] rcu_barrier_sched+0x32/0x40 >> [<c109fdca>] deactivate_locked_super+0x3a/0x60 >> [<c10a05f6>] deactivate_super+0x46/0x60 >> [<c10b6f2a>] mntput_no_expire+0x5a/0x90 >> [<c10b7a6d>] sys_umount+0x5d/0x300 >> [<c10b7d29>] sys_oldumount+0x19/0x20 >> [<c136eb50>] sysenter_do_call+0x12/0x36 >> [<ffffffff>] 0xffffffff > > rcu_barrier() hanging for some reason... I really wonder what's going > on there - missing rcu_read_unlock()? Could you try to reproduce that > sucker and, if possible, bisect it? Yes, it's reproducible, but I'm bisecting another issue and have few more such issues with the current kernel. -- 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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