linux-kernel - Re: nfsd changes for 2.6.37

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Date:	Tue, 26 Oct 2010 17:44:41 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Bryan Schumaker <bjschuma@...app.com>,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: nfsd changes for 2.6.37

On Tue, Oct 26, 2010 at 02:37:26PM -0700, Linus Torvalds wrote:
> On Tue, Oct 26, 2010 at 2:24 PM, J. Bruce Fields <bfields@...ldses.org> wrote:
> >
> > I did a couple connectathon runs just now with no obvious ill effects
> > except for some sleep-within-spinlock warnings in the lease code.
> 
> Hmm. Those sleep-within-spinlock warnings are very likely serious
> bugs.

Yeah, didn't mean to belittle them.

> Can you quote the whole warning with stack trace?

It's just obvious allocations in setlease:

BUG: sleeping function called from invalid context at mm/slab.c:3101
in_atomic(): 1, irqs_disabled(): 0, pid: 4345, name: lease_tests
1 lock held by lease_tests/4345:
 #0:  (file_lock_lock){+.+.+.}, at: [<ffffffff81128be5>] lock_flocks+0x15/0x20
Pid: 4345, comm: lease_tests Not tainted 2.6.36-05858-gbd5e20b #1028
Call Trace:
 [<ffffffff8103141d>] __might_sleep+0x10d/0x140
 [<ffffffff810e3ad3>] kmem_cache_alloc+0x1f3/0x230
 [<ffffffff8112a4d2>] generic_setlease+0x112/0x2c0
 [<ffffffff8112a6b5>] __vfs_setlease+0x35/0x40
 [<ffffffff8112acfe>] fcntl_setlease+0xce/0x180
 [<ffffffff810f7c2e>] sys_fcntl+0x2fe/0x630
 [<ffffffff81961999>] ? trace_hardirqs_on_thunk+0x3a/0x3f
 [<ffffffff81002658>] system_call_fastpath+0x16/0x1b

I'm testing a patch.

--b.
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