linux-kernel - Re: + ipc-convert-ipcs_idr-to-xarray-update.patch added to -mm tree

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Message-Id: <20200605142039.b8a81c08bf5ba34fa0181545@linux-foundation.org>
Date:   Fri, 5 Jun 2020 14:20:39 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Qian Cai <cai@....pw>, linux-kernel@...r.kernel.org,
        dave@...olabs.net, manfred@...orfullife.com,
        mm-commits@...r.kernel.org
Subject: Re: + ipc-convert-ipcs_idr-to-xarray-update.patch added to -mm tree

On Fri, 5 Jun 2020 13:11:34 -0700 Matthew Wilcox <willy@...radead.org> wrote:

> On Fri, Jun 05, 2020 at 03:58:48PM -0400, Qian Cai wrote:
> > This will trigger,
> > 
> > [ 8853.759549] LTP: starting semget05
> > [ 8867.257088] BUG: sleeping function called from invalid context at mm/slab.h:567
> > [ 8867.270259] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 22556, name: semget05
> > [ 8867.270309] 2 locks held by semget05/22556:
> > [ 8867.270345]  #0: 00000000512de7e0 (&ids->rwsem){++++}-{3:3}, at: ipcget+0x4e/0x230
> > [ 8867.270426]  #1: 00000000552b9018 (&new->lock){+.+.}-{2:2}, at: ipc_addid+0xf4/0xf50
> 
> Did the fix for this not make it into -next?

I don't think I've seen this fix before.  And I'm unclear on how it
pertains to the current patch(es) in -mm.  And it has no changelog!

Perhaps it would be best to do a formal send of the latest version?