Public bug reported:
[Impact]
On dual GFX systems, if amdgpu fails to probe a device, vgaarb for
another GFX triggers a NULL pointer dereference and freeze the system.
[Fix]
Defer VGA client registering so resources are handled properly when
amdgpu probe fails.
[Test]
With the patch applied, no more kernel panic when vgaarb is changing the
VGA mode.
[Where problems could occur]
VGA clients won't take effect until a successful probe, so unless there
is very subtle bug in vgaarb or vgaswitcheroo, it's very unlikely to
introduce any regression.
** Affects: hwe-next
Importance: Undecided
Status: New
** Affects: linux (Ubuntu)
Importance: Critical
Status: Confirmed
** Affects: linux-oem-5.10 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Focal)
Importance: Undecided
Status: Won't Fix
** Affects: linux-oem-5.10 (Ubuntu Focal)
Importance: Critical
Status: Confirmed
** Affects: linux (Ubuntu Hirsute)
Importance: Critical
Status: Confirmed
** Affects: linux-oem-5.10 (Ubuntu Hirsute)
Importance: Undecided
Status: Invalid
** Tags: oem-priority originate-from-1914566 stella
** Also affects: linux-oem-5.10 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.10 (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.10 (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Changed in: linux-oem-5.10 (Ubuntu Hirsute)
Status: New => Invalid
** Changed in: linux-oem-5.10 (Ubuntu)
Status: New => Invalid
** Changed in: linux (Ubuntu Focal)
Status: New => Won't Fix
** Changed in: linux (Ubuntu)
Status: New => Confirmed
** Changed in: linux (Ubuntu Hirsute)
Status: New => Confirmed
** Changed in: linux-oem-5.10 (Ubuntu Focal)
Status: New => Confirmed
** Changed in: linux (Ubuntu)
Importance: Undecided => Critical
** Changed in: linux (Ubuntu Hirsute)
Importance: Undecided => Critical
** Changed in: linux-oem-5.10 (Ubuntu Focal)
Importance: Undecided => Critical
** Tags added: oem-priority originate-from-1914566 stella
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https://bugs.launchpad.net/bugs/1926792
Title:
Fix kernel panic at boot on dual GFX systems
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