linux-kernel - call trace: WARNING: ttm_bo_vm_open on qemuarm64 when starting X

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Date:   Mon, 17 Jun 2019 16:05:39 +0800
From:   ddu <dengke.du@...driver.com>
To:     <linux-kernel@...r.kernel.org>
Subject: call trace: WARNING: ttm_bo_vm_open on qemuarm64 when starting X

Hi all

When I build linux kernel 5.2-rc5

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tag/?h=v5.2-rc5

After start the X server, a warning call trace appear:

-----------------------------------------------------------------------

[   61.271345] -------------ttm_bo_mmap--------------
[   65.717991] WARNING: CPU: 0 PID: 241 at 
drivers/gpu/drm/ttm/ttm_bo_vm.c:308 ttm_bo_vm_open+0x44/0x60
[   65.721262] Modules linked in: openvswitch nsh nf_conncount nf_nat 
nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4
[   65.722608] CPU: 0 PID: 241 Comm: X Not tainted 
5.2.0-rc4-yoctodev-standard #1
[   65.722902] Hardware name: linux,dummy-virt (DT)
[   65.723491] pstate: 80000005 (Nzcv daif -PAN -UAO)
[   65.723728] pc : ttm_bo_vm_open+0x44/0x60
[   65.723924] lr : dup_mm+0x2b4/0x468
[   65.724112] sp : ffffff801233bbf0
[   65.724301] x29: ffffff801233bbf0 x28: ffffffc0185f0760
[   65.724568] x27: ffffffc0185f03e0 x26: ffffffc01871acf0
[   65.724775] x25: ffffffc01eb67d20 x24: ffffffc01871ad18
[   65.724977] x23: ffffffc01871ac38 x22: 0000000000000000
[   65.725177] x21: ffffffc0185f0380 x20: ffffffc0184e8958
[   65.725412] x19: ffffffc01871acf0 x18: 0000000000000000
[   65.725626] x17: 0000000000000000 x16: 0000000000000000
[   65.725832] x15: 0000000000000000 x14: 0000000000000009
[   65.726040] x13: 0000000000000000 x12: 003d090000000000
[   65.726238] x11: 00001e8480000000 x10: 0000000000000920
[   65.726485] x9 : ffffff801233ba10 x8 : ffffffc018638980
[   65.726704] x7 : 000057e6b8304adc x6 : 0000000000000010
[   65.726909] x5 : 000000001852d100 x4 : ffffff8010c99000
[   65.727119] x3 : ffffffc0185f09d0 x2 : ffffffc01e2cfae0
[   65.727323] x1 : ffffffc01eb67cf0 x0 : ffffffc01dc89c00
[   65.727686] Call trace:
[   65.727972]  ttm_bo_vm_open+0x44/0x60
[   65.728178]  dup_mm+0x2b4/0x468
[   65.728331]  copy_process.isra.0.part.0+0x1130/0x1540
[   65.728522]  _do_fork+0xe8/0x428
[   65.728674]  __arm64_sys_clone+0x2c/0x38
[   65.728844]  el0_svc_common.constprop.0+0x74/0x168
[   65.729024]  el0_svc_compat_handler+0x2c/0x38
[   65.729192]  el0_svc_compat+0x8/0x10
[   65.729529] ---[ end trace df1974ac6930916f ]---

-----------------------------------------------------------------------

ttm_bo_vm_open:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/ttm/ttm_bo_vm.c?h=v5.2-rc5#n308

That is to say that:

"bo->bdev->dev_mapping" not equal to "vma->vm_file->f_mapping"

But I am sure the ttm_bo_mmap was initial the vma and bdev in 
ttm_do_mmap, because I add a printk after

the :

vma->vm_private_data = bo;

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/ttm/ttm_bo_vm.c?h=v5.2-rc5#n458

and it print something, this means that the bo initial correctlly.

My question:

Where maybe change the bo or the vma when starting X server?

//dengke