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To:     Jens Axboe <axboe@kernel.dk>,
        Douglas Anderson <dianders@chromium.org>,
        Paolo Valente <paolo.valente@linaro.org>
Cc:     linux-kernel <linux-kernel@vger.kernel.org>
From:   Sander Eikelenboom <linux@eikelenboom.it>
Subject: RIP: e030:bfq_exit_icq_bfqq+0x147/0x1c0
Message-ID: <6cfd07de-f5a8-78ea-405a-0243061cb620@eikelenboom.it>
Date:   Thu, 8 Aug 2019 11:05:37 +0200
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Sender: linux-kernel-owner@vger.kernel.org
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L.S.,

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.

It seems it's in the same area as dbc3117d4ca9e17819ac73501e914b8422686750, but already rc3 incorporates that patch.

Any ideas ?

--
Sander


[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 
[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!