[Bug 1881134] Re: amdgpu crashes in mode_support_and_system_configuration

This is now fixed upstream in this commit:
https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=7ad816762f9bf89e940e618ea40c43138b479e10

This might be important enough to patch in Ubuntu eventually. Currently
virtualized 32-bit guest operating systems combined with amdgpu driver
on the host cause random crashes.

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https://bugs.launchpad.net/bugs/1881134

Title:
amdgpu crashes in mode_support_and_system_configuration

Status in linux package in Ubuntu:
Confirmed

Bug description:
When switching window from gnome-terminal to firefox, the amdgpu
kernel driver suddenly crashed. This caused screen to freeze
completely, but ssh to the machine still worked ok.

There is a similar bug filed in
https://bugzilla.kernel.org/show_bug.cgi?id=206987 but not much
activity. I'm not sure if there is an amdgpu specific bugtracker
somewhere.

Below is a decoded call trace and I've attached the full dmesg output.

[455834.384976] simd exception: 0000 [#1] SMP NOPTI
[455834.384980] CPU: 1 PID: 2411 Comm: Xorg Tainted: G W OE 5.4.0-31-generic #35-Ubuntu
...
[455834.385061] Call Trace:
[455834.385120] mode_support_and_system_configuration (/build/linux-FFoizL/linux-5.4.0/drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calc_auto.c:176) amdgpu
[455834.385174] ? calculate_inits_and_adj_vp (/build/linux-FFoizL/linux-5.4.0/drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c:950 (discriminator 12)) amdgpu
[455834.385230] dcn_validate_bandwidth (/build/linux-FFoizL/linux-5.4.0/drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dcn_calcs.c:1034) amdgpu
[455834.385283] dc_validate_global_state (/build/linux-FFoizL/linux-5.4.0/drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c:2093) amdgpu
[455834.385338] amdgpu_dm_atomic_check (/build/linux-FFoizL/linux-5.4.0/drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:7413) amdgpu
[455834.385351] drm_atomic_check_only (/build/linux-FFoizL/linux-5.4.0/drivers/gpu/drm/drm_atomic.c:1179) drm
[455834.385361] drm_atomic_commit (/build/linux-FFoizL/linux-5.4.0/drivers/gpu/drm/drm_atomic.c:1220) drm
[455834.385370] drm_mode_obj_set_property_ioctl (/build/linux-FFoizL/linux-5.4.0/drivers/gpu/drm/drm_mode_object.c:496 /build/linux-FFoizL/linux-5.4.0/drivers/gpu/drm/drm_mode_object.c:533) drm
[455834.385379] ? drm_mode_obj_find_prop_id (/build/linux-FFoizL/linux-5.4.0/drivers/gpu/drm/drm_mode_object.c:512) drm
[455834.385386] drm_ioctl_kernel (/build/linux-FFoizL/linux-5.4.0/drivers/gpu/drm/drm_ioctl.c:793) drm
[455834.385394] drm_ioctl (/build/linux-FFoizL/linux-5.4.0/include/linux/thread_info.h:119 /build/linux-FFoizL/linux-5.4.0/include/linux/thread_info.h:152 /build/linux-FFoizL/linux-5.4.0/include/linux/uaccess.h:151 /build/linux-FFoizL/linux-5.4.0/drivers/gpu/drm/drm_ioctl.c:888) drm
[455834.385402] ? drm_mode_obj_find_prop_id (/build/linux-FFoizL/linux-5.4.0/drivers/gpu/drm/drm_mode_object.c:512) drm
[455834.385406] ? recalc_sigpending (/build/linux-FFoizL/linux-5.4.0/kernel/signal.c:184)
[455834.385440] amdgpu_drm_ioctl (/build/linux-FFoizL/linux-5.4.0/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c:1293) amdgpu
[455834.385443] do_vfs_ioctl (/build/linux-FFoizL/linux-5.4.0/fs/ioctl.c:47 /build/linux-FFoizL/linux-5.4.0/fs/ioctl.c:510 /build/linux-FFoizL/linux-5.4.0/fs/ioctl.c:697)
[455834.385444] ? recalc_sigpending (/build/linux-FFoizL/linux-5.4.0/kernel/signal.c:184)
[455834.385446] ? _copy_from_user (/build/linux-FFoizL/linux-5.4.0/arch/x86/include/asm/uaccess_64.h:46 /build/linux-FFoizL/linux-5.4.0/arch/x86/include/asm/uaccess_64.h:71 /build/linux-FFoizL/linux-5.4.0/lib/usercopy.c:14)
[455834.385448] ksys_ioctl (/build/linux-FFoizL/linux-5.4.0/include/linux/file.h:43 /build/linux-FFoizL/linux-5.4.0/fs/ioctl.c:715)
[455834.385449] __x64_sys_ioctl (/build/linux-FFoizL/linux-5.4.0/fs/ioctl.c:719)
[455834.385451] do_syscall_64 (/build/linux-FFoizL/linux-5.4.0/arch/x86/entry/common.c:290)
[455834.385455] entry_SYSCALL_64_after_hwframe (/build/linux-FFoizL/linux-5.4.0/arch/x86/entry/entry_64.S:184)
[455834.385456] RIP: 0033:0x7faf3181837b

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-31-generic 5.4.0-31.35
ProcVersionSignature: Ubuntu 5.4.0-31.35-generic 5.4.34
Uname: Linux 5.4.0-31-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: petteri 1198 F.... pulseaudio
/dev/snd/controlC0: petteri 1198 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ICEWM
Date: Thu May 28 17:09:28 2020
InstallationDate: Installed on 2020-05-20 (7 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-5.4.0-31-generic root=UUID=81e6e5d0-6a69-412b-8f6c-d6d765ae32de ro rootflags=subvol=@ quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-5.4.0-31-generic N/A
linux-backports-modules-5.4.0-31-generic N/A
linux-firmware 1.187
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/18/2019
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P3.70
dmi.board.name: B450 Gaming-ITX/ac
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP3.70:bd11/18/2019:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnB450Gaming-ITX/ac:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: To Be Filled By O.E.M.
dmi.product.sku: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.

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