Fwd: WARNING ... drivers/gpu/drm/ttm/ttm_bo_vm.c...

Mon Apr 7 22:11:13 PDT 2014

Hi, David,

Are there any dev_mapping changes in 3.15 that could cause this?
Do we know what happens to vma->vm_file->f_mapping during fork?

Thanks,
/Thomas

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Date: 	Tue, 08 Apr 2014 03:29:26 +0200
From: 	poma <pomidorabelisima at gmail.com>
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To: 	Thomas Hellstrom <thellstrom at vmware.com>
CC: 	Linux Kernel list <linux-kernel at vger.kernel.org>, Mailing-List
fedora-kernel <kernel at lists.fedoraproject.org>
Subject: 	WARNING ... drivers/gpu/drm/ttm/ttm_bo_vm.c...
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...
Command line: initrd=initrd.img
inst.stage2=hd:LABEL=Fedora\x20rawhide\x20x86_64  xdriver=modesetting
BOOT_IMAGE=vmlinuz
Kernel command line: initrd=initrd.img
inst.stage2=hd:LABEL=Fedora\x20rawhide\x20x86_64  xdriver=modesetting
BOOT_IMAGE=vmlinuz
...
------------[ cut here ]------------
WARNING: CPU: 1 PID: 1230 at drivers/gpu/drm/ttm/ttm_bo_vm.c:269
ttm_bo_vm_open+0x52/0x80 [ttm]()
CPU: 1 PID: 1230 Comm: Xorg Not tainted 3.15.0-0.rc0.git9.1.fc21.x86_64 #1
Call Trace:
 [<ffffffff817db690>] dump_stack+0x4d/0x66
 [<ffffffff81096b9d>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff81096cca>] warn_slowpath_null+0x1a/0x20
 [<ffffffffa0250452>] ttm_bo_vm_open+0x52/0x80 [ttm]
 [<ffffffff810956fe>] copy_process.part.23+0x1b9e/0x1e90
 [<ffffffff81095bb6>] do_fork+0xc6/0x4b0
 [<ffffffff811de68f>] ? might_fault+0x5f/0xb0
 [<ffffffff817ef695>] ? sysret_check+0x22/0x5d
 [<ffffffff81096026>] SyS_clone+0x16/0x20
 [<ffffffff817efa49>] stub_clone+0x69/0x90
 [<ffffffff817ef669>] ? system_call_fastpath+0x16/0x1b
---[ end trace bc31de8c9c4c4d52 ]---
...

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poma