kern/55033: kernel panics when starting X

[Michael.Scholz%fth-devel.net@localhost]

>Number:         55033
>Category:       kern
>Synopsis:       kernel panics when starting X
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Feb 29 16:45:00 +0000 2020
>Originator:     Michael Scholz
>Release:        NetBSD 9.99.48
>Organization:
>Environment:
System: NetBSD pumpkin.fth-devel.net 9.99.47 NetBSD 9.99.47 (PUMPKIN) #0: Fri Feb 21 12:15:02 CET 2020 toor%pumpkin.fth-devel.net@localhost:/stm/obj/usr/src/sys/arch/amd64/compile/PUMPKIN amd64
Architecture: x86_64
Machine: amd64
>Description:
A kernel from 2020/02/28 panics if starting X (transcipt from picture):
panic: kernel diagnostic assertion "uvm_page_owner_locked_p(new_pg, false)" failed: file "/usr/src/sys/arch/x86/x86/pmap.c", line 4319
cpu0: Begin traceback...
vpanic() at netbsd:vpanic+0x1c0
kern_assert() at netbsd:kern_assert+0x53
pmap_enter_ma() at netbsd:pmap_enter_ma+0x1e2
pmap_enter_default() at netbsd:pmap_enter_default+0x22
ttm_bo_uvm_fault() at netbsd:ttm_bo_uvm_fault+0x25b
radeon_ttm_fault() at netbsd:radeon_ttm_fault+0x60
uvm_fault_internal() at netbsd:uvm_fault_internal+0xae5
trap() at netbsd:trap+0x7b6
--- trap (number 6) ---
7f7ff317715f:
cpu0: End traceback
fatal breakpoint trap in supervisor mode
trap type 1 code 0 rip 0xffffffff8021e3b5 c2 0x8 rflags 0x3202 cr2 0x7f7ff6e43000 ilevel 0 rsp 0xffff9500b871e940
curlwp 0xffffca7c6b037980 pid 433.1 lowest kstack 0xffff9500b871a2c0
Stopped in pid 433.1 (X) at netbsd:breakpoint+0x5: leave
>How-To-Repeat:
Get sources with 'cvs up -D 2020/02/28', compile and install the kernel and reboot.
>Fix:
Sorry, I have no fix.  But I found this also on a kernel from -D 2020/02/25.  The last working kernel was from 2020/02/21.