linux-kernel - Re: problem with 731c7d3, "main drm pull request for 4.8"

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Date:	Fri, 5 Aug 2016 10:13:41 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Mike Marshall <hubcap@...ibond.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org,
	Martin Brandenburg <martin@...ibond.com>
Subject: Re: problem with 731c7d3, "main drm pull request for 4.8"

On Thu, Aug 04, 2016 at 02:08:46PM -0400, Mike Marshall wrote:
> [    1.291797] [drm] Initialized drm 1.1.0 20060810
> [    1.352761] [TTM] Zone  kernel: Available graphics memory: 502128 kiB
> [    1.353248] [TTM] Initializing pool allocator
> [    1.353660] [TTM] Initializing DMA pool allocator
> [    1.355491] BUG: unable to handle kernel NULL pointer dereference
> at 0000000000000018
> [    1.356038] IP: [<ffffffffa00c9875>] drm_pick_crtcs+0x125/0x280
> [drm_kms_helper]
> [    1.356038] PGD 0
> [    1.356038] Oops: 0000 [#1] SMP
> [    1.356038] Modules linked in: cirrus(+) drm_kms_helper ttm drm
> i2c_core ata_generic pata_acpi
> [    1.356038] CPU: 0 PID: 181 Comm: systemd-udevd Not tainted
> 4.7.0-00810-gc1ece76 #9
> [    1.356038] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2007
> [    1.356038] task: ffff880036f40000 task.stack: ffff880036fc0000
> [    1.356038] RIP: 0010:[<ffffffffa00c9875>]  [<ffffffffa00c9875>]
> drm_pick_crtcs+0x125/0x280 [drm_kms_helper]
> [    1.356038] RSP: 0018:ffff880036fc3898  EFLAGS: 00010217
> [    1.356038] RAX: ffffffffa00208f0 RBX: 0000000000000000 RCX: 0000000000001000
> [    1.356038] RDX: 0000000000000000 RSI: ffffffff81c574c0 RDI: ffff880037172800
> [    1.356038] RBP: ffff880036fc3900 R08: 000000000001cc90 R09: ffff880036d829f8
> [    1.356038] R10: ffff88003e001c80 R11: ffff880036d829d8 R12: ffff880037172400
> [    1.356038] R13: 0000000000001000 R14: ffff880037172800 R15: ffff880036d829d0
> [    1.356038] FS:  00007f907d15d880(0000) GS:ffff88003fc00000(0000)
> knlGS:0000000000000000
> [    1.356038] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    1.356038] CR2: 0000000000000018 CR3: 0000000036f6d000 CR4: 00000000000006f0
> [    1.356038] Stack:
> [    1.356038]  0000000000000008 ffff880036d829e0 ffff880036d829d8
> 0000000000000001
> [    1.356038]  0000000000000000 0000100000000003 ffff880036d829e0
> ffff880036d829f8
> [    1.356038]  0000000000000001 ffff880037172400 0000000000000001
> ffff880036d829d0
> [    1.356038] Call Trace:
> [    1.356038]  [<ffffffffa00ca199>] drm_setup_crtcs+0x339/0xa00
> [drm_kms_helper]
> [    1.356038]  [<ffffffff810f78d6>] ? mark_held_locks+0x66/0x90
> [    1.356038]  [<ffffffff817f2149>] ? __mutex_unlock_slowpath+0xd9/0x1a0
> [    1.356038]  [<ffffffffa00caa91>]
> drm_fb_helper_initial_config+0x81/0x3a8 [drm_kms_helper]
> [    1.356038]  [<ffffffffa00475c6>] ? drm_modeset_unlock_all+0x66/0xc0 [drm]
> [    1.356038]  [<ffffffffa0021df0>] cirrus_fbdev_init+0xa0/0xb0 [cirrus]
> [    1.356038]  [<ffffffffa002148b>] cirrus_modeset_init+0x18b/0x1e0 [cirrus]
> [    1.356038]  [<ffffffffa002042c>] cirrus_driver_load+0xbc/0x100 [cirrus]
> [    1.356038]  [<ffffffffa0031b29>] drm_dev_register+0xa9/0xd0 [drm]

This is unlikely to be cirrus specific, but fallout from the
drm_dev_register reorganisation. Could you bisect down into that merge?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre