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Date: Tue, 9 Jun 2020 19:14:09 -0700 From: Matthew Wilcox <willy@...radead.org> To: Andrew Morton <akpm@...ux-foundation.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, Jun 05, 2020 at 02:20:39PM -0700, Andrew Morton wrote: > 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? In testing, I discovered a lockdep warning. I don't think it's readily fixable, so please drop this patch for the moment. I'll be back with a patch set that rejiggers the locking in ipc to be more normal.
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