Re: kern/59629: amdgpu(4): accelerated code may free Xorg, killing it causes crash

[Andrius V <vezhlys%gmail.com@localhost>]

The following reply was made to PR kern/59629; it has been noted by GNATS.

From: Andrius V <vezhlys%gmail.com@localhost>
To: NetBSD GNATS <gnats-bugs%netbsd.org@localhost>
Cc: 
Subject: Re: kern/59629: amdgpu(4): accelerated code may free Xorg, killing it
 causes crash
Date: Wed, 3 Sep 2025 01:32:35 +0300

 Left a typo in the subject: s/may free Xorg/may freeze Xorg/.
 
 On Wed, Sep 3, 2025 at 1:20=E2=80=AFAM <vezhlys%gmail.com@localhost> wrote:
 >
 > >Number:         59629
 > >Category:       kern
 > >Synopsis:       amdgpu(4): accelerated code may free Xorg, killing it ca=
 uses crash
 > >Confidential:   no
 > >Severity:       serious
 > >Priority:       medium
 > >Responsible:    kern-bug-people
 > >State:          open
 > >Class:          sw-bug
 > >Submitter-Id:   net
 > >Arrival-Date:   Tue Sep 02 22:20:00 +0000 2025
 > >Originator:     Andrius V
 > >Release:        NetBSD 11.0_BETA
 > >Organization:
 > >Environment:
 > NetBSD agraphic-pc 11.0_BETA NetBSD 11.0_BETA (GENERIC) #0: Mon Sep  1 00=
 :18:27 EEST 2025  andriusv@agraphic-pc:/home/andriusv/workspace/obj/sys/arc=
 h/amd64/compile/GENERIC amd64
 > >Description:
 > I have two amdgpu(4) "capable" graphics cards: RX460 and RX5700XT. I was =
 mainly using the latter with the NetBSD 10/10.1, since it worked relatively=
  well. However, Xorg was reporting that 2D/3D acceleration was disabled no =
 matter if I would enable in configuration or not.
 >
 > With upgrade to NetBSD 11 Beta, Xorg started to report that 2D/3D acceler=
 ation is enabled (once configured). Unfortunately, as soon as accelerated c=
 ode is being executed (glxgears, firefox with hardware acceleration, scummv=
 m, supertuxkart, etc), it causes Xorg to freeze and it flashes once with mo=
 st of the screen turning into artifacts.
 >
 > RX460 has this problem in a lesser extent, but still more often than not =
 it would cause screen to turn into artifacts (stripes all over the screen, =
 with sometimes mouse movement still visible, but nothing can be done, since=
  all screen is just in "colorful stripes").
 >
 > If accelerated code works sometimes, it does seem to work pretty well (e.=
 g. glxgears shows very high FPS, scummVM games using opengl acceleration wo=
 rk smoothly, etc). Small artifacts still may appear over the place (black r=
 ectangles, broken text in browser), but typically doesn't hinder the usage =
 that much.
 >
 > Once the freeze happens, the system itself doesn't crash. But I can't swi=
 tched to terminal using Alt+F<1-4> buttons. I can connect to the system usi=
 ng ssh.
 >
 > In addition to all the problems, the mouse movement became very sluggish =
 by default on amdgpu(4) (with the other problems described in kern/59628, b=
 ut need to verify if it is amdgpu only).
 >
 > Attempt to kill X session typically ends up in crash:
 >
 > [   114.187571] {drm:netbsd:amdgpu_cs_ioctl+0xe1f} *ERROR* Failed to init=
 ialize parser -87!
 > [   114.407569] {drm:netbsd:amdgpu_cs_ioctl+0xe1f} *ERROR* Failed to init=
 ialize parser -87!
 > [   115.167564] {drm:netbsd:amdgpu_cs_ioctl+0xe1f} *ERROR* Failed to init=
 ialize parser -87!
 > [   115.197563] {drm:netbsd:amdgpu_cs_ioctl+0xe1f} *ERROR* Failed to init=
 ialize parser -87!
 > [   115.927558] {drm:netbsd:amdgpu_cs_ioctl+0xe1f} *ERROR* Failed to init=
 ialize parser -87!
 > [   116.207556] {drm:netbsd:amdgpu_cs_ioctl+0xe1f} *ERROR* Failed to init=
 ialize parser -87!
 > [   116.687553] {drm:netbsd:amdgpu_cs_ioctl+0xe1f} *ERROR* Failed to init=
 ialize parser -87!
 > [   117.217549] {drm:netbsd:amdgpu_cs_ioctl+0xe1f} *ERROR* Failed to init=
 ialize parser -87!
 > [   117.447547] {drm:netbsd:amdgpu_cs_ioctl+0xe1f} *ERROR* Failed to init=
 ialize parser -87!
 > [   118.207541] {drm:netbsd:amdgpu_cs_ioctl+0xe1f} *ERROR* Failed to init=
 ialize parser -87!
 > [   118.227541] {drm:netbsd:amdgpu_cs_ioctl+0xe1f} *ERROR* Failed to init=
 ialize parser -87!
 > [   118.937536] {drm:netbsd:amdgpu_job_timedout+0xaa} *ERROR* ring gfx ti=
 meout, signaled seq=3D3316, emitted seq=3D3316
 > [   118.937536] {drm:netbsd:amdgpu_job_timedout+0xc7} *ERROR* Process inf=
 ormation: process firefox pid 1866 thread firefox:cs0 pid 2805
 > [   118.937536] amdgpu0: GPU reset begin!
 > [   118.967536] {drm:netbsd:amdgpu_cs_ioctl+0xe1f} *ERROR* Failed to init=
 ialize parser -87!
 > [   119.217534] amdgpu0: GPU BACO reset
 > [   119.237534] {drm:netbsd:amdgpu_cs_ioctl+0xe1f} *ERROR* Failed to init=
 ialize parser -87!
 > [   119.577531] warning: [drm] schedsdma0 is not ready, skipping
 > [   119.577531] warning: [drm] schedsdma1 is not ready, skipping
 > [   119.577531] amdgpu0: autoconfiguration error: error: failed to clear =
 page tables on GEM object close (-2)
 > [   119.577531] uvm_fault(0xffff81fd82aa4c80, 0x0, 1) -> e
 > [   119.577531] fatal page fault in supervisor mode
 > [   119.577531] trap type 6 code 0 rip 0xffffffff809bc396 cs 0x8 rflags 0=
 x10296 cr2 0x8 ilevel 0 rsp 0xffff88926e222800
 > [   119.577531] curlwp 0xffff81fd90aa5000 pid 2464.2518 lowest kstack 0xf=
 fff88926e21e2c0
 > [   119.577531] panic: trap
 > [   119.577531] cpu2: Begin traceback...
 > [   119.577531] vpanic() at netbsd:vpanic+0x171
 > [   119.577531] panic() at netbsd:panic+0x3c
 > [   119.577531] trap() at netbsd:trap+0xb43
 > [   119.577531] --- trap (number 6) ---
 > [   119.577531] amdgpu_vm_sdma_commit() at netbsd:amdgpu_vm_sdma_commit+0=
 x3c
 > [   119.577531] amdgpu_vm_bo_update_mapping() at netbsd:amdgpu_vm_bo_upda=
 te_mapping+0x6ce
 > [   119.577531] amdgpu_vm_clear_freed() at netbsd:amdgpu_vm_clear_freed+0=
 xe9
 > [   119.577531] {drm:netbsd:amdgpu_cs_ioctl+0xe1f} *ERROR* Failed to init=
 ialize parser -87!
 > [   119.577531] amdgpu_gem_object_close() at netbsd:amdgpu_gem_object_clo=
 se+0x161
 > [   119.577531] drm_gem_object_release_handle() at netbsd:drm_gem_object_=
 release_handle+0x37
 > [   119.577531] linux_idr_for_each() at netbsd:linux_idr_for_each+0x52
 > [   119.577531] drm_gem_release() at netbsd:drm_gem_release+0x20
 > [   119.577531] drm_file_free() at netbsd:drm_file_free+0x2b5
 > [   119.587532] drm_close() at netbsd:drm_close+0x5a
 > [   119.587532] closef() at netbsd:closef+0x9a
 > [   119.587532] fd_free() at netbsd:fd_free+0xfa
 > [   119.587532] exit1() at netbsd:exit1+0x119
 > [   119.587532] sigexit() at netbsd:sigexit+0x1c2
 > [   119.587532] postsig() at netbsd:postsig+0x35e
 > [   119.587532] lwp_userret() at netbsd:lwp_userret+0x198
 > [   119.587532] mi_userret() at ffffffff805b9b8e
 > [   119.587532] syscall() at netbsd:syscall+0xdc
 > [   119.587532] --- syscall (number 4) ---
 > [   119.587532] netbsd:syscall+0xdc:
 > [   119.587532] cpu2: End traceback...
 >
 >
 > >How-To-Repeat:
 > Start xorg with glamor and DRI "3" accelaration on amdgpu(4) card (see in=
  Xorg.0.log that acceleration is enabled).
 > Start hardware accelerated application (firefox, glxgears, scummvm).
 > Observe freeze/artifacts.
 > Try to kill Xorg (over ssh) or restart system - observe crash (typically)=
 .
 > >Fix:
 >