From: hch@infradead.org (Christoph Hellwig)
Subject: [PATCH 2/7] nvme: switch AEN processing to use blk_execute_rq_nowait
Date: Fri, 25 Sep 2015 15:11:37 -0700 [thread overview]
Message-ID: <20150925221137.GA17965@infradead.org> (raw)
In-Reply-To: <alpine.LNX.2.00.1509241346570.23840@localhost.lm.intel.com>
On Thu, Sep 24, 2015@01:51:33PM +0000, Keith Busch wrote:
> >Yigal, is there a nice easy way to trigger the CPU hotplug migration
> >through sysfs or another userspace interface? I think I can solve
> >this without freeing the AEN early with a little more thought.
>
> To take a cpu offline and trigger a removal:
>
> echo 0 > /sys/devices/system/cpu/cpu1/online
That is already broken in 4.3-rc2 unfortunately:
[ 149.094678] Failed to recover vector for irq 104
[ 149.144128] BUG: unable to handle kernel NULL pointer dereference at 00000000
[ 149.152022] IP: [<ffffffff8131e0b1>] blk_mq_map_swqueue+0xf1/0x260
[ 149.158239] PGD c9d59067 PUD c78ac067 PMD 0
[ 149.162556] Oops: 0002 [#1] SMP DEBUG_PAGEALLOC
[ 149.167222] Modules linked in: nfsd auth_rpcgss oid_registry nfs_acl nfs loc2
[ 149.249367] CPU: 7 PID: 1192 Comm: bash Tainted: G I 4.3.0-rc2+9
[ 149.256788] Hardware name: Dell Inc. PowerEdge R710/00NH4P, BIOS 3.0.0 01/311
[ 149.264295] task: ffff8806115f8040 ti: ffff880613124000 task.ti: ffff88061310
[ 149.271805] RIP: 0010:[<ffffffff8131e0b1>] [<ffffffff8131e0b1>] blk_mq_map_0
[ 149.280461] RSP: 0018:ffff880613127c28 EFLAGS: 00010282
[ 149.285789] RAX: ffff880604b9ac00 RBX: ffffe8fcf6f06a80 RCX: ffff8803234edf00
[ 149.292946] RDX: 0000000000000000 RSI: 0000000000000009 RDI: ffff8806049c12e0
[ 149.300103] RBP: ffff880613127c60 R08: 0000000000000007 R09: 0000000000000000
[ 149.307261] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000009
[ 149.314419] R13: ffff8806049c12e0 R14: ffff880607fcdc20 R15: ffffffff81d2ad00
[ 149.321577] FS: 00007fa17ee79700(0000) GS:ffff880323ac0000(0000) knlGS:00000
[ 149.329694] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 149.335457] CR2: 0000000000000080 CR3: 00000000caf51000 CR4: 00000000000006e0
[ 149.342616] Stack:
[ 149.344633] 0000000000000000 0000000000000000 ffff8806049c12e0 ffffffff81cc0
[ 149.352101] ffffffff81cfaa00 0000000000000000 0000000000000001 ffff880613120
[ 149.359567] ffffffff81320227 ffffffff81cc4740 00000000ffffffe1 ffff880613120
[ 149.367034] Call Trace:
[ 149.369491] [<ffffffff81320227>] blk_mq_queue_reinit_notify+0x137/0x1d0
[ 149.376216] [<ffffffff810a16fd>] notifier_call_chain+0x5d/0x80
[ 149.382156] [<ffffffff810a172e>] __raw_notifier_call_chain+0xe/0x10
[ 149.388533] [<ffffffff8107ba13>] cpu_notify+0x23/0x40
[ 149.393687] [<ffffffff8107bb3e>] cpu_notify_nofail+0xe/0x20
[ 149.399365] [<ffffffff8107be05>] _cpu_down+0x1b5/0x2b0
[ 149.404607] [<ffffffff8107bf36>] cpu_down+0x36/0x50
[ 149.409589] [<ffffffff8146b9a4>] cpu_subsys_offline+0x14/0x20
[ 149.415443] [<ffffffff81466478>] device_offline+0x88/0xb0
[ 149.420947] [<ffffffff8146656d>] online_store+0x3d/0x80
[ 149.426277] [<ffffffff81463798>] dev_attr_store+0x18/0x30
[ 149.431782] [<ffffffff81296765>] sysfs_kf_write+0x45/0x60
[ 149.437286] [<ffffffff81296111>] kernfs_fop_write+0x141/0x190
[ 149.443140] [<ffffffff8120e8b8>] __vfs_write+0x28/0xe0
[ 149.448385] [<ffffffff810cb92f>] ? percpu_down_read+0x5f/0xa0
[ 149.455461] [<ffffffff81211cc1>] ? __sb_start_write+0xf1/0x110
[ 149.462610] [<ffffffff81211cc1>] ? __sb_start_write+0xf1/0x110
[ 149.469747] [<ffffffff8120efa9>] vfs_write+0xa9/0x190
[ 149.476074] [<ffffffff8122ff96>] ? __fget_light+0x66/0x90
[ 149.482726] [<ffffffff8120fcb9>] SyS_write+0x49/0xa0
[ 149.488935] [<ffffffff81618236>] entry_SYSCALL_64_fastpath+0x16/0x7a
next prev parent reply other threads:[~2015-09-25 22:11 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-21 18:40 nvme completion path optimizations and fixes Christoph Hellwig
2015-09-21 18:40 ` [PATCH 1/7] blk-mq: fix racy updates of rq->errors Christoph Hellwig
2015-09-27 7:35 ` Sagi Grimberg
2015-09-21 18:40 ` [PATCH 2/7] nvme: switch AEN processing to use blk_execute_rq_nowait Christoph Hellwig
2015-09-23 23:16 ` Keith Busch
2015-09-24 13:38 ` Christoph Hellwig
2015-09-24 13:51 ` Keith Busch
2015-09-25 22:11 ` Christoph Hellwig [this message]
2015-09-21 18:40 ` [PATCH 3/7] nvme: switch delete SQ/CQ to blk_execute_rq_nowait Christoph Hellwig
2015-09-21 18:40 ` [PATCH 4/7] nvme: switch abort " Christoph Hellwig
2015-09-21 18:40 ` [PATCH 5/7] nvme: simplify completion handling Christoph Hellwig
2015-09-21 18:40 ` [PATCH 6/7] nvme: properly free resources for cancelled command Christoph Hellwig
2015-09-21 18:40 ` [PATCH 7/7] nvme: micro optimize nvme_submit_priv Christoph Hellwig
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