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SubjectRe: [PATCHSET v6] blk-mq scheduling framework
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Date
On 01/11/2017 10:39 PM, Jens Axboe wrote:
> Another year, another posting of this patchset. The previous posting
> was here:
>
> https://www.spinics.net/lists/kernel/msg2406106.html
>
> (yes, I've skipped v5, it was fixes on top of v4, not the rework).
>
> I've reworked bits of this to get rid of the shadow requests, thanks
> to Bart for the inspiration. The missing piece, for me, was the fact
> that we have the tags->rqs[] indirection array already. I've done this
> somewhat differently, though, by having the internal scheduler tag
> map be allocated/torn down when an IO scheduler is attached or
> detached. This also means that when we run without a scheduler, we
> don't have to do double tag allocations, it'll work like before.
>
> The patchset applies on top of 4.10-rc3, or can be pulled here:
>
> git://git.kernel.dk/linux-block blk-mq-sched.6
>
Fun continues:

[ 28.976708] ata3.00: configured for UDMA/100
[ 28.987625] BUG: unable to handle kernel NULL pointer dereference at
0000000000000048
[ 28.987632] IP: deadline_add_request+0x15/0x70
[ 28.987633] PGD 0
[ 28.987634]
[ 28.987636] Oops: 0000 [#1] SMP
[ 28.987638] Modules linked in: ahci libahci libata uhci_hcd(+)
mgag200(+) i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt
fb_sys_fops ttm drm tg3 libphy ehci_pci ehci_hcd usbcore usb_common
ixgbe mdio hpsa(+) dca ptp pps_core scsi_transport_sas fjes(+) sg
dm_multipath dm_mod scsi_dh_rdac scsi_dh_emc scsi_dh_alua autofs4
[ 28.987654] CPU: 0 PID: 268 Comm: kworker/u2:2 Not tainted
4.10.0-rc3+ #535
[ 28.987655] Hardware name: HP ProLiant ML350p Gen8, BIOS P72 09/08/2013
[ 28.987660] Workqueue: events_unbound async_run_entry_fn
[ 28.987661] task: ffff880029391600 task.stack: ffffc9000038c000
[ 28.987663] RIP: 0010:deadline_add_request+0x15/0x70
[ 28.987664] RSP: 0018:ffffc9000038fb00 EFLAGS: 00010286
[ 28.987665] RAX: ffff88003260c400 RBX: 0000000000000000 RCX:
0000000000000000
[ 28.987666] RDX: ffffc9000038fb68 RSI: 0000000000000000 RDI:
ffff8800293b9040
[ 28.987666] RBP: ffffc9000038fb18 R08: 000000000087668] R13:
ffff88003260c400 R14: 0000000000000000 R15: 0000000000000000
[ 28.987670] FS: 0000000000000000(0000) GS:ffff880035c00000(0000)
knlGS:0000000000000000
[ 28.987670] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 28.987671] CR2: 0000000000000048 CR3: 0000000032b64000 CR4:
00000000000406f0
[ 28.987672] Call Trace:
[ 28.987677] blk_mq_sched_get_request+0x12e/0x310
[ 28.987678] ? blk_mq_sched_get_request+0x5/0x310
[ 28.987681] blk_mq_alloc_request+0x40/0x90
[ 28.987684] blk_get_request+0x35/0x110
[ 28.987689] __scsi_execute.isra.24+0x3c/0x160
[ 28.987691] scsi_execute_req_flags+0x94/0x100
[ 28.987694] scsi_probe_and_add_lun+0x207/0xd60
[ 28.987699] ? __pm_rme_resume+0x5c/0x80
[ 28.987701] __scsi_add_device+0x103/0x120
[ 28.987709] ata_scsi_scan_host+0xa3/0x1d0 [libata]
[ 28.987716] async_port_probe+0x43/0x60 [libata]
[ 28.987718] async_run_entry_fn+0x37/0x150
[ 28.987722] process_one_work+0x1d0/0x660

Cheers,

Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
hare@suse.de +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)

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