From: Greg KH <gregkh@linuxfoundation.org>
To: Andrey Grodzovsky <Andrey.Grodzovsky@amd.com>
Cc: daniel.vetter@ffwll.ch, michel@daenzer.net,
dri-devel@lists.freedesktop.org, ppaalanen@gmail.com,
amd-gfx@lists.freedesktop.org, Daniel Vetter <daniel@ffwll.ch>,
ckoenig.leichtzumerken@gmail.com, alexdeucher@gmail.com
Subject: Re: [PATCH v2 5/8] drm/amdgpu: Refactor sysfs removal
Date: Wed, 24 Jun 2020 08:11:53 +0200 [thread overview]
Message-ID: <20200624061153.GA933050@kroah.com> (raw)
In-Reply-To: <090c5a35-3088-d6d0-dcaf-5ce5542a4298@amd.com>
On Tue, Jun 23, 2020 at 11:04:30PM -0400, Andrey Grodzovsky wrote:
>
> On 6/23/20 2:05 AM, Greg KH wrote:
> > On Tue, Jun 23, 2020 at 12:51:00AM -0400, Andrey Grodzovsky wrote:
> > > On 6/22/20 12:45 PM, Greg KH wrote:
> > > > On Mon, Jun 22, 2020 at 12:07:25PM -0400, Andrey Grodzovsky wrote:
> > > > > On 6/22/20 7:21 AM, Greg KH wrote:
> > > > > > On Mon, Jun 22, 2020 at 11:51:24AM +0200, Daniel Vetter wrote:
> > > > > > > On Sun, Jun 21, 2020 at 02:03:05AM -0400, Andrey Grodzovsky wrote:
> > > > > > > > Track sysfs files in a list so they all can be removed during pci remove
> > > > > > > > since otherwise their removal after that causes crash because parent
> > > > > > > > folder was already removed during pci remove.
> > > > > > Huh? That should not happen, do you have a backtrace of that crash?
> > > > > 2 examples in the attached trace.
> > > > Odd, how did you trigger these?
> > >
> > > By manually triggering PCI remove from sysfs
> > >
> > > cd /sys/bus/pci/devices/0000\:05\:00.0 && echo 1 > remove
> > For some reason, I didn't think that video/drm devices could handle
> > hot-remove like this. The "old" PCI hotplug specification explicitly
> > said that video devices were not supported, has that changed?
> >
> > And this whole issue is probably tied to the larger issue that Daniel
> > was asking me about, when it came to device lifetimes and the drm layer,
> > so odds are we need to fix that up first before worrying about trying to
> > support this crazy request, right? :)
> >
> > > > > [ 925.738225 < 0.188086>] BUG: kernel NULL pointer dereference, address: 0000000000000090
> > > > > [ 925.738232 < 0.000007>] #PF: supervisor read access in kernel mode
> > > > > [ 925.738236 < 0.000004>] #PF: error_code(0x0000) - not-present page
> > > > > [ 925.738240 < 0.000004>] PGD 0 P4D 0
> > > > > [ 925.738245 < 0.000005>] Oops: 0000 [#1] SMP PTI
> > > > > [ 925.738249 < 0.000004>] CPU: 7 PID: 2547 Comm: amdgpu_test Tainted: G W OE 5.5.0-rc7-dev-kfd+ #50
> > > > > [ 925.738256 < 0.000007>] Hardware name: System manufacturer System Product Name/RAMPAGE IV FORMULA, BIOS 4804 12/30/2013
> > > > > [ 925.738266 < 0.000010>] RIP: 0010:kernfs_find_ns+0x18/0x110
> > > > > [ 925.738270 < 0.000004>] Code: a6 cf ff 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 41 57 41 56 49 89 f6 41 55 41 54 49 89 fd 55 53 49 89 d4 <0f> b7 af 90 00 00 00 8b 05 8f ee 6b 01 48 8b 5f 68 66 83 e5 20 41
> > > > > [ 925.738282 < 0.000012>] RSP: 0018:ffffad6d0118fb00 EFLAGS: 00010246
> > > > > [ 925.738287 < 0.000005>] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 2098a12076864b7e
> > > > > [ 925.738292 < 0.000005>] RDX: 0000000000000000 RSI: ffffffffb6606b31 RDI: 0000000000000000
> > > > > [ 925.738297 < 0.000005>] RBP: ffffffffb6606b31 R08: ffffffffb5379d10 R09: 0000000000000000
> > > > > [ 925.738302 < 0.000005>] R10: ffffad6d0118fb38 R11: ffff9a75f64820a8 R12: 0000000000000000
> > > > > [ 925.738307 < 0.000005>] R13: 0000000000000000 R14: ffffffffb6606b31 R15: ffff9a7612b06130
> > > > > [ 925.738313 < 0.000006>] FS: 00007f3eca4e8700(0000) GS:ffff9a763dbc0000(0000) knlGS:0000000000000000
> > > > > [ 925.738319 < 0.000006>] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > > > [ 925.738323 < 0.000004>] CR2: 0000000000000090 CR3: 0000000035e5a005 CR4: 00000000000606e0
> > > > > [ 925.738329 < 0.000006>] Call Trace:
> > > > > [ 925.738334 < 0.000005>] kernfs_find_and_get_ns+0x2e/0x50
> > > > > [ 925.738339 < 0.000005>] sysfs_remove_group+0x25/0x80
> > > > > [ 925.738344 < 0.000005>] sysfs_remove_groups+0x29/0x40
> > > > > [ 925.738350 < 0.000006>] free_msi_irqs+0xf5/0x190
> > > > > [ 925.738354 < 0.000004>] pci_disable_msi+0xe9/0x120
> > > > So the PCI core is trying to clean up attributes that it had registered,
> > > > which is fine. But we can't seem to find the attributes? Were they
> > > > already removed somewhere else?
> > > >
> > > > that's odd.
> > >
> > > Yes, as i pointed above i am emulating device remove from sysfs and this
> > > triggers pci device remove sequence and as part of that my specific device
> > > folder (05:00.0) is removed from the sysfs tree.
> > But why are things being removed twice?
>
>
> Not sure I understand what removed twice ? I remove only once per sysfs attribute.
This code path shows that the kernel is trying to remove a file that is
not present, so someone removed it already...
thanks,
gre k-h
_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx
next prev parent reply other threads:[~2020-06-24 7:00 UTC|newest]
Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-21 6:03 [PATCH v2 0/8] RFC Support hot device unplug in amdgpu Andrey Grodzovsky
2020-06-21 6:03 ` [PATCH v2 1/8] drm: Add dummy page per device or GEM object Andrey Grodzovsky
2020-06-22 9:35 ` Daniel Vetter
2020-06-22 14:21 ` Pekka Paalanen
2020-06-22 14:24 ` Daniel Vetter
2020-06-22 14:28 ` Pekka Paalanen
2020-11-09 20:34 ` Andrey Grodzovsky
2020-11-15 6:39 ` Andrey Grodzovsky
2020-06-22 13:18 ` Christian König
2020-06-22 14:23 ` Daniel Vetter
2020-06-22 14:32 ` Andrey Grodzovsky
2020-06-22 17:45 ` Christian König
2020-06-22 17:50 ` Daniel Vetter
2020-11-09 20:53 ` Andrey Grodzovsky
2020-11-13 20:52 ` Andrey Grodzovsky
2020-11-14 8:41 ` Christian König
2020-11-14 9:51 ` Daniel Vetter
2020-11-14 9:57 ` Daniel Vetter
2020-11-16 9:42 ` Michel Dänzer
2020-11-15 6:34 ` Andrey Grodzovsky
2020-11-16 9:48 ` Christian König
2020-11-16 19:00 ` Andrey Grodzovsky
2020-11-16 20:36 ` Christian König
2020-11-16 20:42 ` Andrey Grodzovsky
2020-11-19 10:01 ` Christian König
2020-06-21 6:03 ` [PATCH v2 2/8] drm/ttm: Remap all page faults to per process dummy page Andrey Grodzovsky
2020-06-22 9:41 ` Daniel Vetter
2020-06-24 3:31 ` Andrey Grodzovsky
2020-06-24 7:19 ` Daniel Vetter
2020-11-10 17:41 ` Andrey Grodzovsky
2020-06-22 19:30 ` Christian König
2020-06-21 6:03 ` [PATCH v2 3/8] drm/ttm: Add unampping of the entire device address space Andrey Grodzovsky
2020-06-22 9:45 ` Daniel Vetter
2020-06-23 5:00 ` Andrey Grodzovsky
2020-06-23 10:25 ` Daniel Vetter
2020-06-23 12:55 ` Christian König
2020-06-22 19:37 ` Christian König
2020-06-22 19:47 ` Alex Deucher
2020-06-21 6:03 ` [PATCH v2 4/8] drm/amdgpu: Split amdgpu_device_fini into early and late Andrey Grodzovsky
2020-06-22 9:48 ` Daniel Vetter
2020-11-12 4:19 ` Andrey Grodzovsky
2020-11-12 9:29 ` Daniel Vetter
2020-06-21 6:03 ` [PATCH v2 5/8] drm/amdgpu: Refactor sysfs removal Andrey Grodzovsky
2020-06-22 9:51 ` Daniel Vetter
2020-06-22 11:21 ` Greg KH
2020-06-22 16:07 ` Andrey Grodzovsky
2020-06-22 16:45 ` Greg KH
2020-06-23 4:51 ` Andrey Grodzovsky
2020-06-23 6:05 ` Greg KH
2020-06-24 3:04 ` Andrey Grodzovsky
2020-06-24 6:11 ` Greg KH [this message]
2020-06-25 1:52 ` Andrey Grodzovsky
2020-11-10 17:54 ` Andrey Grodzovsky
2020-11-10 17:59 ` Greg KH
2020-11-11 15:13 ` Andrey Grodzovsky
2020-11-11 15:34 ` Greg KH
2020-11-11 15:45 ` Andrey Grodzovsky
2020-11-11 16:06 ` Greg KH
2020-11-11 16:34 ` Andrey Grodzovsky
2020-12-02 15:48 ` Andrey Grodzovsky
2020-12-02 17:34 ` Greg KH
2020-12-02 18:02 ` Andrey Grodzovsky
2020-12-02 18:20 ` Greg KH
2020-12-02 18:40 ` Andrey Grodzovsky
2020-06-22 13:19 ` Christian König
2020-06-21 6:03 ` [PATCH v2 6/8] drm/amdgpu: Unmap entire device address space on device remove Andrey Grodzovsky
2020-06-22 9:56 ` Daniel Vetter
2020-06-22 19:38 ` Christian König
2020-06-22 19:48 ` Alex Deucher
2020-06-23 10:22 ` Daniel Vetter
2020-06-23 13:16 ` Christian König
2020-06-24 3:12 ` Andrey Grodzovsky
2020-06-21 6:03 ` [PATCH v2 7/8] drm/amdgpu: Fix sdma code crash post device unplug Andrey Grodzovsky
2020-06-22 9:55 ` Daniel Vetter
2020-06-22 19:40 ` Christian König
2020-06-23 5:11 ` Andrey Grodzovsky
2020-06-23 7:14 ` Christian König
2020-06-21 6:03 ` [PATCH v2 8/8] drm/amdgpu: Prevent any job recoveries after device is unplugged Andrey Grodzovsky
2020-06-22 9:53 ` Daniel Vetter
2020-11-17 18:38 ` Andrey Grodzovsky
2020-11-17 18:52 ` Daniel Vetter
2020-11-17 19:18 ` Andrey Grodzovsky
2020-11-17 19:49 ` Daniel Vetter
2020-11-17 20:07 ` Andrey Grodzovsky
2020-11-18 7:39 ` Daniel Vetter
2020-11-18 12:01 ` Christian König
2020-11-18 15:43 ` Luben Tuikov
2020-11-18 16:20 ` Andrey Grodzovsky
2020-11-19 7:55 ` Christian König
2020-11-19 15:02 ` Andrey Grodzovsky
2020-11-19 15:29 ` Daniel Vetter
2020-11-19 21:24 ` Andrey Grodzovsky
2020-11-18 0:46 ` Luben Tuikov
2020-06-22 9:46 ` [PATCH v2 0/8] RFC Support hot device unplug in amdgpu Daniel Vetter
2020-06-23 5:14 ` Andrey Grodzovsky
2020-06-23 9:04 ` Michel Dänzer
2020-06-24 3:21 ` Andrey Grodzovsky
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200624061153.GA933050@kroah.com \
--to=gregkh@linuxfoundation.org \
--cc=Andrey.Grodzovsky@amd.com \
--cc=alexdeucher@gmail.com \
--cc=amd-gfx@lists.freedesktop.org \
--cc=ckoenig.leichtzumerken@gmail.com \
--cc=daniel.vetter@ffwll.ch \
--cc=daniel@ffwll.ch \
--cc=dri-devel@lists.freedesktop.org \
--cc=michel@daenzer.net \
--cc=ppaalanen@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).