[Bug 23847] New: kernel BUG when using nouveau

[Bug 23847] New: kernel BUG when using nouveau

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=23847

           Summary: kernel BUG when using nouveau
           Product: xorg
           Version: 7.4
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
        ReportedBy: shiningxc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
         QAContact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org


Loading nouveau drm module causes big kernel problems. Trying to load X always
results in hardlock.
If I blacklist nouveau drm module with the same kernel, it is perfectly stable.

* nouveau git kernel from 09/09 b4eaf6c7cf5621a7ccc556123ccab64811ab2e40
* ddx git from 09/09
* X.Org X Server 1.6.3.901 (1.6.4 RC 1)
* libdrm 2.4.13
* 01:00.0 VGA compatible controller: nVidia Corporation G84 [GeForce 8600M GT]
(rev a1)

[  281.450035] nouveau 0000:01:00.0: nouveau_channel_free: freeing fifo 2
[  281.463089] nouveau 0000:01:00.0: nouveau_channel_free: freeing fifo 1
[  281.486950] [TTM] Zone  kernel: Used memory at exit: 0 kiB.
[  281.486956] [TTM] Zone highmem: Used memory at exit: 0 kiB.
[  288.525197] ------------[ cut here ]------------
[  288.525215] WARNING: at block/cfq-iosched.c:1771 cfq_cic_lookup+0x61/0xce()
[  288.525222] Hardware name: XPS M1530                       
[  288.525226] Modules linked in: fuse nouveau ttm drm_kms_helper drm agpgart
i2c_algo_bit iwl3945 iwlcore mac80211 cfg80211 ohci1394 ieee1394 btusb
bluetooth rfkill sdhci_pci sdhci mmc_core ricoh_mmc sky2 cpufreq_conservative
acpi_cpufreq freq_table loop
[  288.525279] Pid: 2982, comm: hald-addon-stor Not tainted 2.6.31-rc8 #1
[  288.525284] Call Trace:
[  288.525296]  [<c0225a00>] warn_slowpath_common+0x65/0x7c
[  288.525305]  [<c03ada74>] ? cfq_cic_lookup+0x61/0xce
[  288.525313]  [<c0225a24>] warn_slowpath_null+0xd/0x10
[  288.525321]  [<c03ada74>] cfq_cic_lookup+0x61/0xce
[  288.525330]  [<c03adc27>] cfq_may_queue+0x1e/0xab
[  288.525338]  [<c039d892>] elv_may_queue+0x14/0x1b
[  288.525348]  [<c03a291f>] get_request+0x24/0x253
[  288.525356]  [<c03a300e>] get_request_wait+0x18/0x12f
[  288.525366]  [<c0239077>] ? hrtimer_wakeup+0x0/0x1c
[  288.525375]  [<c0236d61>] ? remove_wait_queue+0x31/0x36
[  288.525383]  [<c03a315c>] blk_get_request+0x37/0x58
[  288.525394]  [<c0428cd1>] scsi_execute+0x23/0x11b
[  288.525403]  [<c0428e1b>] scsi_execute_req+0x52/0x7f
[  288.525412]  [<c0433db0>] sr_test_unit_ready+0x41/0x99
[  288.525420]  [<c04347c8>] sr_media_change+0x37/0x1e3
[  288.525430]  [<c044d459>] media_changed+0x43/0x72
[  288.525438]  [<c044d4b0>] cdrom_media_changed+0x28/0x2e
[  288.525446]  [<c0433e4f>] sr_block_media_changed+0x11/0x13
[  288.525456]  [<c02b1e7d>] check_disk_change+0x19/0x42
[  288.525464]  [<c044f23f>] cdrom_open+0x794/0x7f7
[  288.525473]  [<c0423ba6>] ? scsi_done+0x0/0xd
[  288.525480]  [<c043f4d1>] ? atapi_xlat+0x0/0x15f
[  288.525491]  [<c05bfe39>] ? schedule_timeout+0x17/0xbd
[  288.525499]  [<c0423ba6>] ? scsi_done+0x0/0xd
[  288.525508]  [<c03b0907>] ? kobject_put+0x37/0x3c
[  288.525518]  [<c041bf8a>] ? put_device+0xf/0x11
[  288.525526]  [<c04280a2>] ? scsi_request_fn+0x326/0x3c6
[  288.525536]  [<c0380536>] ? avc_has_perm+0x3c/0x46
[  288.525545]  [<c0380536>] ? avc_has_perm+0x3c/0x46
[  288.525553]  [<c03b09e8>] ? kobject_get+0x12/0x17
[  288.525562]  [<c03a88cf>] ? get_disk+0x39/0x50
[  288.525571]  [<c03a88f0>] ? exact_lock+0xa/0x11
[  288.525579]  [<c03b09e8>] ? kobject_get+0x12/0x17
[  288.525587]  [<c041c01a>] ? get_device+0x13/0x18
[  288.525595]  [<c0433f8a>] sr_block_open+0x6d/0x82
[  288.525603]  [<c02b27a0>] __blkdev_get+0x7f/0x289
[  288.525612]  [<c02b29b4>] blkdev_get+0xa/0xc
[  288.525619]  [<c02b2a15>] blkdev_open+0x5f/0x8b
[  288.525629]  [<c0292e84>] __dentry_open+0x111/0x1f4
[  288.525638]  [<c0293005>] nameidata_to_filp+0x2d/0x42
[  288.525646]  [<c02b29b6>] ? blkdev_open+0x0/0x8b
[  288.525655]  [<c029cb6a>] do_filp_open+0x3b2/0x6a4
[  288.525663]  [<c044e0dd>] ? cdrom_release+0x16c/0x19f
[  288.525671]  [<c03b0907>] ? kobject_put+0x37/0x3c
[  288.525680]  [<c029069b>] ? __slab_alloc+0x9a/0x425
[  288.525689]  [<c0290af8>] ? kmem_cache_alloc+0x57/0xd9
[  288.525697]  [<c029cebb>] ? getname+0x1b/0xb9
[  288.525706]  [<c02a4787>] ? alloc_fd+0x53/0xb8
[  288.525715]  [<c0292c7d>] do_sys_open+0x48/0xdf
[  288.525724]  [<c0292d56>] sys_open+0x1e/0x26
[  288.525733]  [<c0202984>] sysenter_do_call+0x12/0x22
[  288.525739] ---[ end trace 1946ff4265fe09ba ]---
[  288.525759] ------------[ cut here ]------------
[  288.526043] kernel BUG at block/cfq-iosched.c:1775!
[  288.526104] invalid opcode: 0000 [#1] SMP


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[Bug 23847] kernel BUG when using nouveau

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=23847





--- Comment #1 from Xavier <shiningxc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2009-09-10 10:49:08 PST ---
Created an attachment (id=29389)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=29389)
xorg log


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[Bug 23847] kernel BUG when using nouveau

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=23847





--- Comment #2 from Xavier <shiningxc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2009-09-10 10:49:31 PST ---
Created an attachment (id=29390)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=29390)
kernel dmesg


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[Bug 23847] kernel BUG when using nouveau

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=23847





--- Comment #3 from Xavier <shiningxc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2009-09-10 10:49:50 PST ---
Created an attachment (id=29391)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=29391)
kernel config


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[Bug 23847] kernel BUG when using nouveau

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http://bugs.freedesktop.org/show_bug.cgi?id=23847





--- Comment #4 from Xavier <shiningxc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2009-09-10 13:22:46 PST ---
After a git bisect and 10 reboot, I found the offending commit :
http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?id=9d8ae0c84726807c43b7230b8e6c2d079c33b81d

reverting that line works perfectly here :)

I just regret I first tried nouveau-git right after that commit went in. If I
had tried just before, it would have been easy to find the regression.


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[Bug 23847] kernel BUG when using nouveau

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http://bugs.freedesktop.org/show_bug.cgi?id=23847





--- Comment #5 from Xavier <shiningxc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2009-09-10 13:45:43 PST ---
sorry, disregard the last information.
The problem is that there is some randomness involved. The kernel booted fine
twice in a row, and then everything worked fine. But rebooting another time
triggered the same failure again.


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[Bug 23847] kernel BUG when using nouveau

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=23847


a.radke-KvP5wT2u2U0@public.gmane.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |a.radke-KvP5wT2u2U0@public.gmane.org




--- Comment #6 from a.radke-KvP5wT2u2U0@public.gmane.org  2009-09-11 09:01:29 PST ---
Same here. Same distribution. Different card. I have a gf6200TC. It happens to
me only when I enable KMS. Then it took me 8 boots to get it up. 7times it
crashed similar.

With KMS disabled this never happened and Xorg starts fine. Then there are
problems shutting down Xorg process but that's probably something different.

How can we help to track this down?

stable kernel 2.6.31, nouveau from master daily snapshot 20090909. gcc4.4.1


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[Bug 23847] kernel BUG when using nouveau

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http://bugs.freedesktop.org/show_bug.cgi?id=23847


Pekka Paalanen <pq-X3B1VOXEql0@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #29389|application/octet-stream    |text/plain
          mime type|                            |




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[Bug 23847] kernel BUG when using nouveau

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http://bugs.freedesktop.org/show_bug.cgi?id=23847


Pekka Paalanen <pq-X3B1VOXEql0@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #29390|application/octet-stream    |text/plain
          mime type|                            |




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[Bug 23847] kernel BUG when using nouveau

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http://bugs.freedesktop.org/show_bug.cgi?id=23847


Pekka Paalanen <pq-X3B1VOXEql0@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #29391|application/octet-stream    |text/plain
          mime type|                            |




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[Bug 23847] kernel BUG when using nouveau

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http://bugs.freedesktop.org/show_bug.cgi?id=23847





--- Comment #7 from Pekka Paalanen <pq-X3B1VOXEql0@public.gmane.org>  2009-09-14 11:48:01 PST ---
From what has been reported here, this looks like a race in a completely
irrelevant (to nouveau) part of the kernel. It happens randomly, more often
when nouveau.ko KMS is loaded early, and less often when nouveau.ko loads
later. AFAIK no-one has yet managed to hit it completely without Nouveau, which
is somewhat concerning. My guess is that nouveau alters the kernel code
execution timings and makes a race elsewhere a lot more failure prone.

Some suggestions:
- search kernel mailing lists for CFQ bug reports (since it seems to happen in
CFQ code)
- try to reproduce it without nouveau, e.g., try an old FB driver
- try enabling heavy debugging features in the kernel config, like kmemcheck or
kmemleak

I'm trying to steer this away from Nouveau first, because it looks very
difficult to debug.

In the future, please provide full kernel logs from boot, and set attachment
type to text/plain.


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--- Comment #8 from Xavier <shiningxc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2009-09-15 14:13:39 PST ---
Some new information :
* CONFIG_DEBUG_SPINLOCK (spinlock and rw lock debugging : basic checks) works
around the problem (it leads to very stable nouveau kms)
* maxcpus=1 does not workaround the problem
* traces are not always in cfq code
* traces only happen when nouveau is loaded
* other framebuffer drivers work fine (vesafb, uvesafb, nvidiafb)
* crash are (almost?) always with kms on
* crash can happen both at boot or when reloading module
* crash seem more frequent when nouveau is loaded by udev or in early boot,
rather than loaded with X
* happen both with 2.6.31-rc8 (nouveau-git) and 2.6.31 stable


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--- Comment #9 from Xavier <shiningxc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2009-09-15 14:15:31 PST ---
Created an attachment (id=29577)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=29577)
crash when reloading the module (2.6.31 stable / master-compat 20090909)


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[Bug 23847] kernel BUG when using nouveau

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http://bugs.freedesktop.org/show_bug.cgi?id=23847





--- Comment #10 from Xavier <shiningxc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2009-09-15 14:16:18 PST ---
Created an attachment (id=29578)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=29578)
crash when reloading the module (nouveau-git kernel from today - 2.6.31-rc8)


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http://bugs.freedesktop.org/show_bug.cgi?id=23847





--- Comment #11 from Xavier <shiningxc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2009-09-18 06:04:41 PST ---
* building a kernel without highmem does not help
* booting with nosmp does not help


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[Bug 23847] kernel BUG when using nouveau

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--- Comment #12 from Xavier <shiningxc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2009-09-24 14:02:58 PST ---
Disabling PAT on latest nouveau git kernel does not help.
2.6.31.1 kernel (+ master-compat snapshopt from today) does not help.


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--- Comment #13 from Xavier <shiningxc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2009-09-28 13:22:17 PST ---
So still using nouveau kernel (2.6.31-rc9 now).

When nouveau is loaded during boot, it seems to crash 100% of the times, with a
trace similar to the one here :
https://bugs.freedesktop.org/attachment.cgi?id=29578

That is :
BUG: unable to handle kernel NULL pointer dereference at 00000003
IP: [<c027e452>] kmem_cache_alloc+0x62/0xda

When I boot with noacpi, the first initialization does not crash for some
reasons... But as soon as I reload the module, it crashes, in random places of
the code. I will attach two dmesg showing that.


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--- Comment #14 from Xavier <shiningxc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2009-09-28 13:23:29 PST ---
Created an attachment (id=29924)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=29924)
crash when reloading the module (nouveau-git 2.6.31-rc9 booted with noacpi)


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http://bugs.freedesktop.org/show_bug.cgi?id=23847





--- Comment #15 from Xavier <shiningxc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2009-09-28 13:23:51 PST ---
Created an attachment (id=29925)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=29925)
another crash when reloading the module (nouveau-git 2.6.31-rc9 booted with
noacpi)


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--- Comment #16 from Pekka Paalanen <pq-X3B1VOXEql0@public.gmane.org>  2009-09-29 10:07:47 PST ---
Created an attachment (id=29949)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=29949)
replacement for DEBUG_SPINLOCK?

Could you try if this patch has the same effect as enabling DEBUG_SPINLOCK?
If it does, could you try to reduce the patch to a minimal set of changes that
does the same.


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--- Comment #17 from a.radke-KvP5wT2u2U0@public.gmane.org  2009-09-29 10:30:50 PST ---
Created an attachment (id=29950)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=29950)
ttm trace log


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--- Comment #18 from a.radke-KvP5wT2u2U0@public.gmane.org  2009-09-29 10:32:25 PST ---
I have a x86_64 system and enabled DEBUG_SPINLOCK but it didn't solve anything
for me.

I enabled the debug option for the drm module and when udev starts it shows 

Sep 29 16:59:20 workstation64 kernel: BUG: unable to handle kernel NULL pointer
dereference at 00000000000000cc
Sep 29 16:59:20 workstation64 kernel: IP: [<ffffffff811f726b>]
_raw_spin_lock+0x2b/0x190
Sep 29 16:59:20 workstation64 kernel: PGD 22e59f067 PUD 22e60a067 PMD 0 
Sep 29 16:59:20 workstation64 kernel: Oops: 0000 [#1] PREEMPT SMP 
Sep 29 16:59:20 workstation64 kernel: last sysfs file:
/sys/module/evdev/initstate
Sep 29 16:59:20 workstation64 kernel: CPU 3 
Sep 29 16:59:20 workstation64 kernel: Modules linked in: ttm(+) serio_raw
drm_kms_helper thermal sg mii pcspkr soundcore snd_page_alloc evdev ehci_hcd(+)
drm i2c_i801 button iTCO_wdt i2c_algo_bit iTCO_vendor_su
pport i2c_core processor usbcore intel_agp rtc_cmos rtc_core rtc_lib ext4
mbcache jbd2 crc16 sd_mod ahci libata scsi_mod
Sep 29 16:59:20 workstation64 kernel: Pid: 601, comm: modprobe Not tainted
2.6.31-ARCH #1 OEM
Sep 29 16:59:20 workstation64 kernel: RIP: 0010:[<ffffffff811f726b>] 
[<ffffffff811f726b>] _raw_spin_lock+0x2b/0x190

more in the log


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--- Comment #19 from Tavian Barnes <tavianator-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2009-09-30 16:45:55 PST ---
Created an attachment (id=29962)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=29962)
[PATCH] drm/nouveau: fix missized allocation for ttm_bo_global struct

This patch from
http://0x04.net/~mwk/0001-drm-nouveau-fix-missized-allocation-for-ttm_bo_glob.patch
fixes it, right?


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[Bug 23847] kernel BUG when using nouveau

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=23847





--- Comment #20 from a.radke-KvP5wT2u2U0@public.gmane.org  2009-09-30 20:51:39 PST ---
Yes, it fixes it for Xavier (i686) and me (x86_64).


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[Bug 23847] kernel BUG when using nouveau

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=23847


Marcin Kościelnicki <koriakin@0x04.net> changed:

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




--- Comment #21 from Marcin Kościelnicki <koriakin@0x04.net>  2009-10-01 00:35:07 PST ---
Seems to work for everyone involved, fix has been commited to git. Closing.


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