[Nouveau] suspend to ram -> BOOM: exception RIP: drm_calc_vbltimestamp_from_scanoutpos+335

[Tobias Klausmann]

 >On Tue, Jul 11, 2017 at 2:08 PM, Mike Galbraith wrote:
 >> On Tue, 2017-07-11 at 13:51 -0400, Ilia Mirkin wrote:
 >>> Some details that may be useful in analysis of the bug:
 >>>
 >>> 1. lspci -nn -d 10de:
 >>
 >> 01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GM204 
[GeForce GTX 980] [10de:13c0] (rev a1)
 >> 01:00.1 Audio device [0403]: NVIDIA Corporation GM204 High 
Definition Audio Controller [10de:0fbb] (rev a1
 >>
 >>> 2. What displays, if any, you have plugged into the NVIDIA board when
 >>> this happens?
 >>
 >> A Philips 273V, via DVI.
 >>
 >>> 3. Any boot parameters, esp relating to ACPI, PM, or related?
 >>
 >> None for those, what's there that will be unfamiliar to you are for
 >> patches that aren't applied.
 >>
 >> nortsched hpc_cpusets skew_tick=1 ftrace_dump_on_oops audit=0
 >> nodelayacct cgroup_disable=memory rtkthreads=1 rtworkqueues=2 panic=60
 >> ignore_loglevel crashkernel=256M,high
 >
 > OK, thanks. So in other words, a fairly standard desktop with a PCIe
 > board plugged in. No funny business. (Laptops can create a ton of
 > additional weirdness, which I assumed you had since you were talking
 > about STR.)
 >
 > My best guess is that gf119_head_vblank_put either has a bogus head id
 > (should be in the 0..3 range) which causes it to do an out-of-bounds
 > read on MMIO space, or that the MMIO mapping has already been removed
 > by the time nouveau_display_suspend runs. Adding Ben Skeggs for
 > additional insight.
 >
 > Some display stuff did change for 4.13 for GM20x+ boards. If it's not
 > too much trouble, a bisect would be pretty useful.


Hey Mike,
just to inform you: i have a quite similar bug with no monitor attached 
while putting my nouveau card to sleep (laptop/optimus system) within 
nouveau_display_suspend().

I'm going to bisect this, hopefully on the long run this will aid in 
resolving your issue as well!

Greeting,
Tobias