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Date: Wed, 29 Mar 2017 13:14:42 +0200 From: Ilya Dryomov <idryomov@...il.com> To: Brian Foster <bfoster@...hat.com> Cc: Michal Hocko <mhocko@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, stable@...r.kernel.org, Sergey Jerusalimov <wintchester@...il.com>, Jeff Layton <jlayton@...hat.com>, linux-xfs@...r.kernel.org Subject: Re: [PATCH 4.4 48/76] libceph: force GFP_NOIO for socket allocations On Wed, Mar 29, 2017 at 1:05 PM, Brian Foster <bfoster@...hat.com> wrote: > On Wed, Mar 29, 2017 at 12:41:26PM +0200, Michal Hocko wrote: >> [CC xfs guys] >> >> On Wed 29-03-17 11:21:44, Ilya Dryomov wrote: >> [...] >> > This is a set of stack traces from http://tracker.ceph.com/issues/19309 >> > (linked in the changelog): >> > >> > Workqueue: ceph-msgr con_work [libceph] >> > ffff8810871cb018 0000000000000046 0000000000000000 ffff881085d40000 >> > 0000000000012b00 ffff881025cad428 ffff8810871cbfd8 0000000000012b00 >> > ffff880102fc1000 ffff881085d40000 ffff8810871cb038 ffff8810871cb148 >> > Call Trace: >> > [<ffffffff816dd629>] schedule+0x29/0x70 >> > [<ffffffff816e066d>] schedule_timeout+0x1bd/0x200 >> > [<ffffffff81093ffc>] ? ttwu_do_wakeup+0x2c/0x120 >> > [<ffffffff81094266>] ? ttwu_do_activate.constprop.135+0x66/0x70 >> > [<ffffffff816deb5f>] wait_for_completion+0xbf/0x180 >> > [<ffffffff81097cd0>] ? try_to_wake_up+0x390/0x390 >> > [<ffffffff81086335>] flush_work+0x165/0x250 >> >> I suspect this is xlog_cil_push_now -> flush_work(&cil->xc_push_work) >> right? I kind of got lost where this waits on an IO. >> > > Yep. That means a CIL push is already in progress. We wait on that to > complete here. After that, the resulting task queues execution of > xlog_cil_push_work()->xlog_cil_push() on m_cil_workqueue. That task may > submit I/O to the log. > > I don't see any reference to xlog_cil_push() anywhere in the traces here > or in the bug referenced above, however..? Well, it's prefaced with "Interesting is:"... Sergey (the original reporter, CCed here) might still have the rest of them. Thanks, Ilya
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