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Date: Mon, 22 Aug 2011 09:27:01 -0400 From: Josh Boyer <jwboyer@...il.com> To: Al Viro <viro@...iv.linux.org.uk>, "Theodore Ts'o" <tytso@....edu> Cc: "Justin P. Mattock" <justinmattock@...il.com>, Peter Zijlstra <peterz@...radead.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: INFO: possible circular locking dependency detected 3.1.0-rc2-00190-g3210d19 On Mon, Aug 22, 2011 at 9:16 AM, Al Viro <viro@...iv.linux.org.uk> wrote: > On Mon, Aug 22, 2011 at 09:09:14AM -0400, Josh Boyer wrote: > >> We've had a report of this on 3.0.1 as well. Slightly different >> scenario and fs, but the locks in question are the same. >> https://bugzilla.redhat.com/show_bug.cgi?id=730998 >> >> It seems that with CONFIG_PROVE_LOCKING on, might_fault will always >> attempt to grab mm->mmap_sem. The common flow here is that getdents >> calls filldir, which calls copy_to_user, which is what is calling >> might_fault. >> >> Beyond that, I'm a bit over my head at the moment because I don't know >> if the VFS is right and we just need some more lockdep annotations or >> if there really is a problem. > > Don't grab ->i_mutex in ->evict_inode(). Why are you doing that, anyway? I've no idea. Let's ask Ted! josh -- 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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