[Bug 30370] New: Nouveau module crashes with "divide error"

[Bug 30370] New: Nouveau module crashes with "divide error"

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

https://bugs.freedesktop.org/show_bug.cgi?id=30370

           Summary: Nouveau module crashes with "divide error"
           Product: xorg
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
        ReportedBy: aa_z9-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org
         QAContact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org


Created an attachment (id=38947)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=38947)
dmesg output with drm.debug=14  nouveau.reg_debug=0x0200

The latest version of the nouveau module crashes on my PC with a divide error.

git://anongit.freedesktop.org/nouveau/linux-2.6
Commit: 9c4f93718e0ced5c2b028cb84159a063daa5d576
Date: Fri Sep 24 09:17:02 2010 +1000

From dmesg:
...
[    4.730824] divide error: 0000 [#1] SMP 
...
[    4.737222] Pid: 667, comm: modprobe Not tainted 2.6.36-rc5+ #4 Portable
PC/Portable PC
[    4.737342] RIP: 0010:[<ffffffffa0211898>]  [<ffffffffa0211898>]
nv50_pm_clock_get+0xa8/0xc0 [nouveau]
[    4.737560] RSP: 0018:ffff880139875a20  EFLAGS: 00010246
[    4.737660] RAX: 0000000000000000 RBX: ffff880138180000 RCX:
0000000000000000
[    4.737762] RDX: 0000000000000000 RSI: 0000000000000046 RDI:
ffffc90004704034
[    4.737864] RBP: ffff880139875a28 R08: 000000000003171d R09:
0000000000000000
[    4.737965] R10: 0000000000000000 R11: 0000000000000003 R12:
0000000000000000
[    4.738067] R13: ffff880138180f68 R14: ffff880139875a78 R15:
0000000000000108
[    4.738170] FS:  00007ffdcdf4c700(0000) GS:ffff880001700000(0000)
knlGS:0000000000000000
[    4.738290] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[    4.738389] CR2: 000000000061d488 CR3: 0000000139130000 CR4:
00000000000006e0
[    4.738491] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[    4.738594] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[    4.738696] Process modprobe (pid: 667, threadinfo ffff880139874000, task
ffff88013b652920)
[    4.738815] Stack:
[    4.738904]  ffff880139b92120 ffff880139875a58 ffffffffa01d8c71
0000000000000003
[    4.739207] <0> ffff880138180f68 ffff880138180000 ffff880139b92120
ffff880139875bb8
[    4.739669] <0> ffffffffa01d8ed3 ffff880100000028 ffff880139875ac8
342079726f6d656d
[    4.740005] Call Trace:
[    4.740005]  [<ffffffffa01d8c71>] nouveau_pm_perflvl_get+0x91/0xe0 [nouveau]
[    4.740005]  [<ffffffffa01d8ed3>] nouveau_pm_init+0x103/0x3a0 [nouveau]
[    4.740005]  [<ffffffffa01d28e2>] ? nouveau_bios_init+0x1a72/0x2800
[nouveau]
[    4.740005]  [<ffffffff81088a42>] ? __get_free_pages+0x12/0x50
[    4.740005]  [<ffffffff812a35c9>] ? mutex_lock+0x19/0x50
[    4.740005]  [<ffffffffa01ad21b>] nouveau_card_init+0x3bb/0x1390 [nouveau]
[    4.740005]  [<ffffffffa01ae739>] nouveau_load+0x429/0x700 [nouveau]
[    4.740005]  [<ffffffffa0143870>] drm_get_pci_dev+0x180/0x2a0 [drm]
[    4.740005]  [<ffffffffa0212ea0>] nouveau_pci_probe+0x10/0x17 [nouveau]
[    4.740005]  [<ffffffff81168fc2>] local_pci_probe+0x12/0x20
[    4.740005]  [<ffffffff81169fd0>] pci_device_probe+0x80/0xb0
[    4.740005]  [<ffffffff811de03a>] ? driver_sysfs_add+0x7a/0xb0
[    4.740005]  [<ffffffff811de179>] driver_probe_device+0x89/0x1a0
[    4.740005]  [<ffffffff811de323>] __driver_attach+0x93/0xa0
[    4.740005]  [<ffffffff811de290>] ? __driver_attach+0x0/0xa0
[    4.740005]  [<ffffffff811dd638>] bus_for_each_dev+0x68/0x90
[    4.740005]  [<ffffffff811ddfb9>] driver_attach+0x19/0x20
[    4.740005]  [<ffffffff811dd8f8>] bus_add_driver+0xb8/0x260
[    4.740005]  [<ffffffffa0233000>] ? nouveau_init+0x0/0x4a [nouveau]
[    4.740005]  [<ffffffff811de618>] driver_register+0x78/0x140
[    4.740005]  [<ffffffffa0233000>] ? nouveau_init+0x0/0x4a [nouveau]
[    4.740005]  [<ffffffff8116a241>] __pci_register_driver+0x51/0xd0
[    4.740005]  [<ffffffffa0143a5f>] drm_pci_init+0xcf/0xe0 [drm]
[    4.740005]  [<ffffffffa0233000>] ? nouveau_init+0x0/0x4a [nouveau]
[    4.740005]  [<ffffffffa013cba3>] drm_init+0x53/0x70 [drm]
[    4.740005]  [<ffffffffa0233048>] nouveau_init+0x48/0x4a [nouveau]
[    4.740005]  [<ffffffff810001de>] do_one_initcall+0x3e/0x170
[    4.740005]  [<ffffffff8106abaa>] sys_init_module+0xba/0x200
[    4.740005]  [<ffffffff8100246b>] system_call_fastpath+0x16/0x1b

Full dmesg output attached.

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[Bug 30370] Nouveau module crashes with "divide error"

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

https://bugs.freedesktop.org/show_bug.cgi?id=30370

Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #38947|application/octet-stream    |text/plain
          mime type|                            |

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[Bug 30370] Nouveau module crashes with "divide error"

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

https://bugs.freedesktop.org/show_bug.cgi?id=30370

--- Comment #1 from Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2010-09-25 04:42:04 PDT ---
Created an attachment (id=38950)
 View: https://bugs.freedesktop.org/attachment.cgi?id=38950
 Review: https://bugs.freedesktop.org/review?bug=30370&attachment=38950

debug patch

Check this patch and please attach dmesg output with it.
The patch will prevent the crash and may help figure out how to fix it
properly.

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[Bug 30370] Nouveau module crashes with "divide error"

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

https://bugs.freedesktop.org/show_bug.cgi?id=30370

--- Comment #2 from aa_z9-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org 2010-09-25 21:40:29 PDT ---
Created an attachment (id=38957)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=38957)
dmesg output with options: drm.debug=14 nouveau.reg_debug=0x0200

Patch applied, new dmesg output attached.

Thanks for your help.

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[Bug 30370] Nouveau module crashes with "divide error"

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

https://bugs.freedesktop.org/show_bug.cgi?id=30370

Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #38957|application/octet-stream    |text/plain
          mime type|                            |

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[Bug 30370] Nouveau module crashes with "divide error"

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

https://bugs.freedesktop.org/show_bug.cgi?id=30370

--- Comment #3 from Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2010-09-26 05:12:47 PDT ---
Ok, so we can't calculate clock for PLL_UNK05, which purpose is... unknown.

I guess we could apply this patch as is?

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[Bug 30370] Nouveau module crashes with "divide error"

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

https://bugs.freedesktop.org/show_bug.cgi?id=30370

--- Comment #4 from Emil Velikov <eeydev-QabDm/c3fAmwa9SdKMSz+Q@public.gmane.org> 2010-09-26 10:57:37 PDT ---
The problem is a combined issue of two things

1. The original nv50 and nv98 use a pll_limits table v2.1 which has a default
pll_limits entry (reg == 0)

Note: The same revision of the pll table is being used on a range of nv4x
cards, where the some pll's are not present in the table, thus the default
entry's setting are being used 

2. The different cards have different UNK plls, that somewhat need to be setup
(their exact purpose is currently unknown but the vbios has values for them,
that appear to be used)

The above patch is a quick and easy solution, although actual check if the pll
has to be setup on the specific card, should be implemented

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[Bug 30370] Nouveau module crashes with "divide error"

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

https://bugs.freedesktop.org/show_bug.cgi?id=30370

--- Comment #5 from Emil Velikov <eeydev-QabDm/c3fAmwa9SdKMSz+Q@public.gmane.org> 2010-10-09 10:04:18 PDT ---
Another patch solving your issue has been pushed already in master, but it
introduced a regression. Can you please test the latest git and tell us if the
issue still occur. Although in order for us to understand better the PM
procedure on your card can you dump your vbios[1] (and possibly provide a
PM-dump[2]) and send it to us

[1] http://nouveau.freedesktop.org/wiki/DumpingVideoBios
[2] http://nouveau.freedesktop.org/wiki/PowerManagementDumps

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[Bug 30370] Nouveau module crashes with "divide error"

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

https://bugs.freedesktop.org/show_bug.cgi?id=30370

--- Comment #6 from aa_z9-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org 2010-10-12 03:59:25 PDT ---
Created an attachment (id=39377)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=39377)
Video card BIOS

The latest git (4ec13442f9f9dfedb15473fdfc99fa71967ed48e) does not exhibit the
issue. This is good news.

Dump of video card BIOS is attached.

I can try to get a PM dump if it will help you, but it will have to wait until
I reconfigure the NVIDIA binary driver.

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[Bug 30370] Nouveau module crashes with "divide error"

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

https://bugs.freedesktop.org/show_bug.cgi?id=30370

Lucas Stach <dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |eeydev-QabDm/c3fAmwa9SdKMSz+Q@public.gmane.org

--- Comment #7 from Lucas Stach <dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org> 2011-02-15 01:58:17 PST ---
@Emil: could you please comment on this? Do we still need something or should
we close this bug as the reported problem is apparently fixed?

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[Bug 30370] Nouveau module crashes with "divide error"

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

https://bugs.freedesktop.org/show_bug.cgi?id=30370

--- Comment #8 from Emil Velikov <eeydev-QabDm/c3fAmwa9SdKMSz+Q@public.gmane.org> 2011-02-15 02:21:35 PST ---
Currently there is a patch that does "handle" this situation [1]. Unfortunately
I was
 silly enough to assume perfect PLL limits table, therefore on some cards it
introduces
 a recession. It is mainly related to understanding/mapping the correct
registers on 
the all of the cards (thus my request for a Power-management dump).
As the mappings can be quite extensive and currently not fully known I would
opt out
 of my solution and prefer the one given by Marcin Slusarz [2]

[1]
http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?id=eadc69cc9054594ff7860d407f855536af13af99
[2] https://bugs.freedesktop.org/attachment.cgi?id=38950
________________________________________
From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org [bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org]
Sent: 15 February 2011 09:58
To: eeydev-QabDm/c3fAmwa9SdKMSz+Q@public.gmane.org
Subject: [Bug 30370] Nouveau module crashes with "divide error"

https://bugs.freedesktop.org/show_bug.cgi?id=30370

Lucas Stach <dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |eeydev-QabDm/c3fAmwa9SdKMSz+Q@public.gmane.org

--- Comment #7 from Lucas Stach <dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org> 2011-02-15 01:58:17 PST ---
@Emil: could you please comment on this? Do we still need something or should
we close this bug as the reported problem is apparently fixed?

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[Bug 30370] Nouveau module crashes with "divide error"

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

[-- Attachment #1.1: Type: text/plain, Size: 718 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=30370

Emil Velikov <emil.l.velikov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #9 from Emil Velikov <emil.l.velikov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
The "regression" mentioned is that the incorrect pll entry/setting were mapped.
All of that has been resolved with the linux 3.7 kernel rework

Marking as Resolved/Fixed

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