linux-kernel - Re: [WARNING] CPU: 27 PID: 6295 at kernel/sched/core.c:7300 __might

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Message-ID: <CAM_iQpXku3CCCahFMBwp08P6Rh2bwYx6GZ8RMS2ASq1hcqMU7A@mail.gmail.com>
Date:	Wed, 4 Feb 2015 22:33:21 -0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Jinpu Wang <jinpu.wang@...fitbricks.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [WARNING] CPU: 27 PID: 6295 at kernel/sched/core.c:7300 __might_sleep+0xbd/0xd0()

On Wed, Feb 4, 2015 at 1:57 AM, Jinpu Wang <jinpu.wang@...fitbricks.com> wrote:
> Hi,
>
> I hit WARNING below after update to 3.19-rc6, when I running fio with libaio.
> Any one see this warning before, or maybe know how to fix it?
>
> From the call trace:
> (gdb) list *read_events+0x1e8
> 0xffffffff81225ad8 is in read_events (fs/aio.c:1259).
> 1254         * something to be aware of when touching this code.
> 1255         */
> 1256        if (until.tv64 == 0)
> 1257            aio_read_events(ctx, min_nr, nr, event, &ret);
> 1258        else
> 1259            wait_event_interruptible_hrtimeout(ctx->wait,
> 1260                    aio_read_events(ctx, min_nr, nr, event, &ret),
> 1261                    until);
> 1262
> 1263        if (!ret && signal_pending(current))
> (gdb)
>
> looks like the WARNING come from wait_event_interruptible_hrtimeout?

Probably fixed by:
http://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?id=3e87523897e18a3e17fc8955ed795188be737ff1
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