Date:	Mon, 30 Nov 2015 13:03:59 -0700
From:	Jens Axboe <axboe@...com>
To:	Julien Grall <julien.grall@...rix.com>, <ming.lei@...onical.com>
CC:	<linux-block@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	xen-devel <xen-devel@...ts.xen.org>
Subject: Re: ARM64 DOM0 crashing after commit 578270b "block: fix segment
 split"

On 11/30/2015 11:22 AM, Julien Grall wrote:
> Hello,
>
> I've been trying the Linux 4.4-rc3 on mustang (ARM64) with Xen.
> DOM0 is crashing as soon as a guest is started when QDISK is
> used for the disk:
>
> ------------[ cut here ]------------
> WARNING: at /home/julien/works/linux/block/blk-merge.c:435
> Modules linked in:
>
> CPU: 6 PID: 0 Comm: swapper/6 Not tainted 4.4.0-rc3 #276
> Hardware name: APM X-Gene Mustang board (DT)
> task: ffffffc1f6d13700 ti: ffffffc1f6d2c000 task.ti: ffffffc1f6d2c000
> PC is at blk_rq_map_sg+0x3dc/0x4a4
> LR is at blk_rq_map_sg+0x454/0x4a4
> pc : [<ffffffc00035bc78>] lr : [<ffffffc00035bcf0>] pstate: 200001c5
> sp : ffffffc1f6d2f8a0
> x29: ffffffc1f6d2f8a0 x28: 0000000000000020
> x27: ffffffc1f5ccc000 x26: ffffffc1f6166740
> x25: 000000000000000b x24: ffffffc0fa11e000
> x23: ffffffc1f6166740 x22: ffffffc1f5ccc1f0
> x21: 0000000000000000 x20: 0000000000000000
> x19: 0000000000000000 x18: 0000000000000007
> x17: 000000000000000e x16: 0000000000000001
> x15: 0000000000000019 x14: 0000000000000033
> x13: 000000000000004c x12: 0000000000000068
> x11: ffffffc1f6d2fbd0 x10: ffffffc1f62e0000
> x9 : 0000000000000000 x8 : ffffffc1f6166740
> x7 : 0000000000000000 x6 : 0000000000000000
> x5 : 0000000000001000 x4 : 0000000000001000
> x3 : 0000000000001000 x2 : 00000042f2e4c000
> x1 : 0000000000000000 x0 : 000000000000000a
>
> ---[ end trace 247f3acfda1a2560 ]---
> Call trace:
> [<ffffffc00035bc78>] blk_rq_map_sg+0x3dc/0x4a4
> [<ffffffc000473b34>] scsi_init_sgtable+0x70/0xd8
> [<ffffffc000473bd4>] scsi_init_io+0x38/0x108
> [<ffffffc00047c858>] sd_init_command+0x44/0x9c4
> [<ffffffc000473d6c>] scsi_setup_cmnd+0xc8/0x11c
> [<ffffffc000473e78>] scsi_prep_fn+0xb8/0x138
> [<ffffffc00035739c>] blk_peek_request+0x150/0x204
> [<ffffffc000474850>] scsi_request_fn+0x4c/0x5ac
> [<ffffffc000353978>] __blk_run_queue+0x34/0x4c
> [<ffffffc000353b80>] blk_run_queue+0x24/0x3c
> [<ffffffc000472cfc>] scsi_run_queue+0x204/0x290
> [<ffffffc000473728>] scsi_end_request+0x128/0x188
> [<ffffffc000474ed0>] scsi_io_completion+0x98/0x514
> [<ffffffc00046d910>] scsi_finish_command+0xc4/0x110
> [<ffffffc0004747d4>] scsi_softirq_done+0x130/0x160
> [<ffffffc00035d160>] blk_done_softirq+0x7c/0x94
> [<ffffffc0000b8a30>] __do_softirq+0xfc/0x200
> [<ffffffc0000b8d84>] irq_exit+0x84/0xd8
> [<ffffffc00008ec7c>] handle_IPI+0x104/0x19c
> [<ffffffc000082510>] gic_handle_irq+0x84/0x9c
> Exception stack(0xffffffc1f6d2fe00 to 0xffffffc1f6d2ff20)
> fe00: ffffffc000966000 ffffffc000966a68 ffffffc1f6d2ff50 ffffffc0000867f0
> fe20: 0000000060000145 0000000a489e3200 0000000000000000 0000000000000000
> fe40: 0000000000000001 ffffffc00096a000 0000000000000001 ffffffc1fff9a048
> fe60: ffffffc1f6fbef08 ffffffc1fff9a188 00000000ffff0594 ffffffc1f6d2fec0
> fe80: 0000000000000740 ffffffc1f6276370 0000000000000018 00000003e8000000
> fea0: 0000000000000000 000a9e23fc000000 ffffffc0001a34d4 0000007f8a8d2820
> fec0: 0000007f89432760 ffffffc000966000 ffffffc000966a68 ffffffc000946ac0
> fee0: ffffffc1f6d2ff70 ffffffc00094a1e8 ffffffc000677978 ffffffc000966000
> ff00: ffffffc1f6d2c000 0000000000000000 0000000000000000 ffffffc1f6d2ff50
> [<ffffffc0000855a8>] el1_irq+0x68/0xd8
> [<ffffffc0000e9b48>] default_idle_call+0x1c/0x30
> [<ffffffc0000e9d74>] cpu_startup_entry+0x1c8/0x218
> [<ffffffc00008e804>] secondary_start_kernel+0x11c/0x140
> [<00000041000827ec>] 0x41000827ec
> ------------[ cut here ]------------
> kernel BUG at /home/julien/works/linux/drivers/scsi/scsi_lib.c:1096!
> Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
> Modules linked in:
> CPU: 6 PID: 0 Comm: swapper/6 Tainted: G        W       4.4.0-rc3 #276
> Hardware name: APM X-Gene Mustang board (DT)
> task: ffffffc1f6d13700 ti: ffffffc1f6d2c000 task.ti: ffffffc1f6d2c000
> PC is at scsi_init_sgtable+0xc0/0xd8
> LR is at scsi_init_sgtable+0x70/0xd8
> pc : [<ffffffc000473b84>] lr : [<ffffffc000473b34>] pstate: 200001c5
> sp : ffffffc1f6d2f950
> x29: ffffffc1f6d2f950 x28: ffffffc000848aa8
> x27: ffffffc000808270 x26: ffffffc1f5cd8000
> x25: ffffffc1f6e68830 x24: 0000000000034000
> x23: ffffffc1f6e68800 x22: 0000000000000000
> x21: 0000000000000000 x20: ffffffc0fa11e000
> x19: ffffffc0fa25b2c0 x18: 0000000000000007
> x17: 000000000000000e x16: 0000000000000001
> x15: 0000000000000019 x14: 0000000000000033
> x13: 000000000000004c x12: 0000000000000068
> x11: ffffffc1f6d2fbd0 x10: ffffffc1f62e0000
> x9 : 0000000000000000 x8 : ffffffc1f6166740
> x7 : 0000000000000000 x6 : 0000000000000000
> x5 : 0000000000001000 x4 : 0000000000001000
> x3 : 0000000000001000 x2 : 00000042f2e4c000
> x1 : 000000000000000a x0 : 000000000000000b
>
> Process swapper/6 (pid: 0, stack limit = 0xffffffc1f6d2c020)
> Stack: (0xffffffc1f6d2f950 to 0xffffffc1f6d30000)
> f940:                                   ffffffc1f6d2f980 ffffffc000473bd4
> f960: ffffffc0fa11e000 ffffffc0fa11e000 ffffffc0fa25b200 ffffffc000483838
> f980: ffffffc1f6d2f9c0 ffffffc00047c858 ffffffc0fa11e000 ffffffc1f6e68800
> f9a0: ffffffc1f62e0000 000000000acdc310 ffffffc1f5cd9400 ffffffc0faa64800
> f9c0: ffffffc1f6d2fa30 ffffffc000473d6c ffffffc0fa25b200 ffffffc1f6e68968
> f9e0: ffffffc1f62e0000 ffffffc1f6e68800 ffffffc1f62e0000 ffffffc1f6ff6d70
> fa00: ffffffc1f6e68830 ffffffc1f6e68800 ffffffc1f6d2fa20 ffffffc00046d408
> fa20: ffffffc1f6d2fa60 ffffffc000473ee8 ffffffc1f6d2fa60 ffffffc000473e78
> fa40: ffffffc0fa11e000 ffffffc1f6e68800 ffffffc1f62e0000 ffffffc1f6ff6d70
> fa60: ffffffc1f6d2fa90 ffffffc00035739c ffffffc1f62e0000 ffffffc0fa11e000
> fa80: ffffffc0fa8d9100 0000000000000080 ffffffc1f6d2fac0 ffffffc000474850
> faa0: ffffffc1f6e68800 ffffffc0faa64800 ffffffc0fab6ed80 ffffffc1f6e68850
> fac0: ffffffc1f6d2fb30 ffffffc000353978 ffffffc1f62e0000 ffffffc1f5cd8028
> fae0: ffffffc0faa64840 ffffffc1f62e0000 ffffffc1f5cd8000 0000000000000140
> fb00: 0000000000000000 ffffffc1f62e0000 0000000000000005 0000000000001d4c
> fb20: ffffffc1f6d2fb30 ffffffc000848b38 ffffffc1f6d2fb50 ffffffc000353b80
> fb40: ffffffc1f62e0000 ffffffc0009a2e08 ffffffc1f6d2fb80 ffffffc000472cfc
> fb60: ffffffc0faa64800 0000000000000140 0000000000000000 0000000000000140
> fb80: ffffffc1f6d2fbe0 ffffffc000473728 ffffffc1f6e68800 0000000000000000
> fba0: ffffffc0f8c2e000 ffffffc0fa25b200 ffffffc1f62e0000 0000000000000140
> fbc0: 0000000000000000 ffffffc0fa25b200 ffffffc1f62e0000 0000000000000000
> fbe0: ffffffc1f6d2fc30 ffffffc000474ed0 ffffffc0fa25b200 ffffffc0f8c2e000
> fc00: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> fc20: 0000000000001000 0000000000000006 ffffffc1f6d2fca0 ffffffc00046d910
> fc40: ffffffc0fa25b200 0000000000001000 ffffffc1f5cd8028 ffffffc0faa64800
> fc60: 0000000000000020 0000000000000101 0000000000000004 ffffffc000966200
> fc80: ffffffc000966220 0000000000000000 ffffffc0fa25b200 0000000000002002
> fca0: ffffffc1f6d2fcd0 ffffffc0004747d4 ffffffc0fa25b200 0000000000001d4c
> fcc0: 0000000000000005 ffffffc1f6d2fd30 ffffffc1f6d2fd00 ffffffc00035d160
> fce0: ffffffc1f6d2fd20 ffffffc000966000 ffffffc000946a38 0000000000000000
> fd00: ffffffc1f6d2fd30 ffffffc0000b8a30 ffffffc1f6d2c000 ffffffc0000d6a78
> fd20: ffffffc1f6d2fd20 ffffffc1f6d2fd20 ffffffc1f6d2fdb0 ffffffc0000b8d84
> fd40: ffffffc000948000 0000000000000006 0000000000000000 ffffff8000040010
> fd60: ffffff8000041000 ffffffc000677978 ffffffc000966000 ffffffc1f6d2c000
> fd80: 0000000000000000 0000000000000000 ffffffc000948000 00000000ffff05a9
> fda0: ffffffc00080a998 0000000a00200040 ffffffc1f6d2fdc0 ffffffc00008ec7c
> fdc0: ffffffc1f6d2fdf0 ffffffc000082510 ffffff800004000c ffffffc1f6d2fe30
> fde0: ffffffc000969000 ffffffc00010f798 ffffffc1f6d2ff50 ffffffc0000855a8
> fe00: ffffffc000966000 ffffffc000966a68 ffffffc1f6d2ff50 ffffffc0000867f0
> fe20: 0000000060000145 0000000a489e3200 0000000000000000 0000000000000000
> fe40: 0000000000000001 ffffffc00096a000 0000000000000001 ffffffc1fff9a048
> fe60: ffffffc1f6fbef08 ffffffc1fff9a188 00000000ffff0594 ffffffc1f6d2fec0
> fe80: 0000000000000740 ffffffc1f6276370 0000000000000018 00000003e8000000
> fea0: 0000000000000000 000a9e23fc000000 ffffffc0001a34d4 0000007f8a8d2820
> fec0: 0000007f89432760 ffffffc000966000 ffffffc000966a68 ffffffc000946ac0
> fee0: ffffffc1f6d2ff70 ffffffc00094a1e8 ffffffc000677978 ffffffc000966000
> ff00: ffffffc1f6d2c000 0000000000000000 0000000000000000 ffffffc1f6d2ff50
> ff20: ffffffc0000867ec ffffffc1f6d2ff50 ffffffc0000867f0 0000000060000145
> ff40: ffffffc000966000 ffffffc0001126b8 ffffffc1f6d2ff60 ffffffc0000e9b48
> ff60: ffffffc1f6d2ff70 ffffffc0000e9d74 ffffffc1f6d2ffd0 ffffffc00008e804
> ff80: 0000000000000006 0000000000000e11 ffffffc0009db6a8 0000000000000000
> ffa0: 0000000000000000 0000000000000000 0000004100a0f000 0000004100a12000
> ffc0: ffffffc000082800 0000000000000000 0000000000000000 00000041000827ec
> ffe0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> Call trace:
> [<ffffffc000473b84>] scsi_init_sgtable+0xc0/0xd8
> [<ffffffc000473bd4>] scsi_init_io+0x38/0x108
> [<ffffffc00047c858>] sd_init_command+0x44/0x9c4
> [<ffffffc000473d6c>] scsi_setup_cmnd+0xc8/0x11c
> [<ffffffc000473e78>] scsi_prep_fn+0xb8/0x138
> [<ffffffc00035739c>] blk_peek_request+0x150/0x204
> [<ffffffc000474850>] scsi_request_fn+0x4c/0x5ac
> [<ffffffc000353978>] __blk_run_queue+0x34/0x4c
> [<ffffffc000353b80>] blk_run_queue+0x24/0x3c
> [<ffffffc000472cfc>] scsi_run_queue+0x204/0x290
> [<ffffffc000473728>] scsi_end_request+0x128/0x188
> [<ffffffc000474ed0>] scsi_io_completion+0x98/0x514
> [<ffffffc00046d910>] scsi_finish_command+0xc4/0x110
> [<ffffffc0004747d4>] scsi_softirq_done+0x130/0x160
> [<ffffffc00035d160>] blk_done_softirq+0x7c/0x94
> [<ffffffc0000b8a30>] __do_softirq+0xfc/0x200
> [<ffffffc0000b8d84>] irq_exit+0x84/0xd8
> [<ffffffc00008ec7c>] handle_IPI+0x104/0x19c
> [<ffffffc000082510>] gic_handle_irq+0x84/0x9c
> Exception stack(0xffffffc1f6d2fe00 to 0xffffffc1f6d2ff20)
> fe00: ffffffc000966000 ffffffc000966a68 ffffffc1f6d2ff50 ffffffc0000867f0
> fe20: 0000000060000145 0000000a489e3200 0000000000000000 0000000000000000
> fe40: 0000000000000001 ffffffc00096a000 0000000000000001 ffffffc1fff9a048
> fe60: ffffffc1f6fbef08 ffffffc1fff9a188 00000000ffff0594 ffffffc1f6d2fec0
> fe80: 0000000000000740 ffffffc1f6276370 0000000000000018 00000003e8000000
> fea0: 0000000000000000 000a9e23fc000000 ffffffc0001a34d4 0000007f8a8d2820
> fec0: 0000007f89432760 ffffffc000966000 ffffffc000966a68 ffffffc000946ac0
> fee0: ffffffc1f6d2ff70 ffffffc00094a1e8 ffffffc000677978 ffffffc000966000
> ff00: ffffffc1f6d2c000 0000000000000000 0000000000000000 ffffffc1f6d2ff50
> [<ffffffc0000855a8>] el1_irq+0x68/0xd8
> [<ffffffc0000e9b48>] default_idle_call+0x1c/0x30
> [<ffffffc0000e9d74>] cpu_startup_entry+0x1c8/0x218
> [<ffffffc00008e804>] secondary_start_kernel+0x11c/0x140
> [<00000041000827ec>] 0x41000827ec
> Code: b9000a66 97fc3032 17ffffea d4210000 (d4210000)
> ---[ end trace 247f3acfda1a2561 ]---
>
> The bisector fingered the commit 578270b "block: fix segment split".
> If I reverted this patch on top of 4.4-rc3 and everything seems to
> work fine.
>
> Anyone have any ideas?

Can you try my for-linus branch?

git://git.kernel.dk/linux-block for-linus

You can pull it into Linus' master, or just test it separately.

-- 
Jens Axboe

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