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Subject: Re: RIP: e030:bfq_exit_icq_bfqq+0x147/0x1c0
From:   Paolo Valente <paolo.valente@linaro.org>
In-Reply-To: <6cfd07de-f5a8-78ea-405a-0243061cb620@eikelenboom.it>
Date:   Thu, 8 Aug 2019 11:10:48 +0200
Cc:     Jens Axboe <axboe@kernel.dk>,
        Douglas Anderson <dianders@chromium.org>,
        linux-kernel <linux-kernel@vger.kernel.org>
Content-Transfer-Encoding: quoted-printable
Message-Id: <6A27F793-838B-4329-8C26-8768ED9BBD8A@linaro.org>
References: <6cfd07de-f5a8-78ea-405a-0243061cb620@eikelenboom.it>
To:     Sander Eikelenboom <linux@eikelenboom.it>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk


> Il giorno 8 ago 2019, alle ore 11:05, Sander Eikelenboom =
<linux@eikelenboom.it> ha scritto:
>=20
> L.S.,
>=20
> While testing a linux 5.3-rc3 kernel on my Xen server I come across =
the splat below when trying to shutdown all the VM's.
> This is after the server has ran for a few days without any problem. =
It seems to happen consistently.
>=20
> It seems it's in the same area as =
dbc3117d4ca9e17819ac73501e914b8422686750, but already rc3 incorporates =
that patch.
>=20
> Any ideas ?
>=20

Could you try these fixes I proposed yesterday:
https://lkml.org/lkml/2019/8/7/536
or, on patchwork:
https://patchwork.kernel.org/patch/11082247/
https://patchwork.kernel.org/patch/11082249/

I posted a further fix too, which should be unrelated. But, just in =
case:
https://lkml.org/lkml/2019/8/7/715
or, on patchwork:
https://patchwork.kernel.org/patch/11082521/

Crossing my fingers (and think you for reporting this),
Paolo

> --
> Sander
>=20
>=20
> [80915.716048] BUG: unable to handle page fault for address: =
0000100000000008
> [80915.724188] #PF: supervisor write access in kernel mode
> [80915.733182] #PF: error_code(0x0002) - not-present page
> [80915.741455] PGD 0 P4D 0=20
> [80915.750538] Oops: 0002 [#1] SMP NOPTI
> [80915.758425] CPU: 4 PID: 11407 Comm: 17.hda-2 Tainted: G        W    =
     5.3.0-rc3-20190807-doflr+ #1
> [80915.766137] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640)  , =
BIOS V1.8B1 09/13/2010
> [80915.773737] RIP: e030:bfq_exit_icq_bfqq+0x147/0x1c0
> [80915.781294] Code: 00 00 00 00 00 00 48 0f ba b0 20 01 00 00 0c 48 =
8b 88 f0 01 00 00 48 85 c9 74 29 48 8b b0 e8 01 00 00 48 89 31 48 85 f6 =
74 04 <48> 89 4e 08 48 c7 80 e8 01 00 00 00 00 00 00 48 c7 80 f0 01 00 =
00
> [80915.796792] RSP: e02b:ffffc9000473be28 EFLAGS: 00010006
> [80915.804419] RAX: ffff888070393200 RBX: ffff888076c4a800 RCX: =
ffff888076c4a9f8
> [80915.810254] device vif17.0 left promiscuous mode
> [80915.811906] RDX: 0000100000000000 RSI: 0000100000000000 RDI: =
0000000000000000
> [80915.811908] RBP: ffff888077efc398 R08: 0000000000000004 R09: =
ffffffff81106800
> [80915.811909] R10: ffff88807804ca40 R11: ffffc9000473be31 R12: =
ffff888005256bf0
> [80915.811909] R13: 0000000000000000 R14: ffff888005256800 R15: =
ffffffff82a6a3c0
> [80915.811919] FS:  00007f1c30a8dbc0(0000) GS:ffff88807d500000(0000) =
knlGS:0000000000000000
> [80915.819456] xen_bridge: port 18(vif17.0) entered disabled state
> [80915.826569] CS:  10000e030 DS: 0000 ES: 0000 CR0: 0000000080050033
> [80915.826571] CR2: 0000100000000008 CR3: 000000005d9d0000 CR4: =
0000000000000660
> [80915.826575] Call Trace:
> [80915.826592]  bfq_exit_icq+0xe/0x20
> [80915.826595]  put_io_context_active+0x52/0x80
> [80915.826599]  do_exit+0x774/0xac0
> [80915.906037]  ? xen_blkif_be_int+0x30/0x30
> [80915.913311]  kthread+0xda/0x130
> [80915.920398]  ? kthread_park+0x80/0x80
> [80915.927524]  ret_from_fork+0x22/0x40
> [80915.934512] Modules linked in:
> [80915.941412] CR2: 0000100000000008
> [80915.948221] ---[ end trace 61315493e0f8ef40 ]---
> [80915.954984] RIP: e030:bfq_exit_icq_bfqq+0x147/0x1c0
> [80915.961850] Code: 00 00 00 00 00 00 48 0f ba b0 20 01 00 00 0c 48 =
8b 88 f0 01 00 00 48 85 c9 74 29 48 8b b0 e8 01 00 00 48 89 31 48 85 f6 =
74 04 <48> 89 4e 08 48 c7 80 e8 01 00 00 00 00 00 00 48 c7 80 f0 01 00 =
00
> [80915.976124] RSP: e02b:ffffc9000473be28 EFLAGS: 00010006
> [80915.983205] RAX: ffff888070393200 RBX: ffff888076c4a800 RCX: =
ffff888076c4a9f8
> [80915.990321] RDX: 0000100000000000 RSI: 0000100000000000 RDI: =
0000000000000000
> [80915.997319] RBP: ffff888077efc398 R08: 0000000000000004 R09: =
ffffffff81106800
> [80916.004427] R10: ffff88807804ca40 R11: ffffc9000473be31 R12: =
ffff888005256bf0
> [80916.011525] R13: 0000000000000000 R14: ffff888005256800 R15: =
ffffffff82a6a3c0
> [80916.018679] FS:  00007f1c30a8dbc0(0000) GS:ffff88807d500000(0000) =
knlGS:0000000000000000
> [80916.025897] CS:  10000e030 DS: 0000 ES: 0000 CR0: 0000000080050033
> [80916.033116] CR2: 0000100000000008 CR3: 000000005d9d0000 CR4: =
0000000000000660
> [80916.040348] Fixing recursive fault but reboot is needed!