Failures in x86 pmap

[Andrew Doran <ad%netbsd.org@localhost>]

Having gotten a report of this privately I've now started running into it. 
Has anyone else seen this, and if so any idea when it started happening? 
I wonder if there is a memory corruption or TLB coherency issue.

Andrew



hanging here:

db{0}> bt
pmap_pp_remove() at netbsd:pmap_pp_remove+0x46c
uvm_anon_dispose() at netbsd:uvm_anon_dispose+0xd0
uvm_anon_freelst() at netbsd:uvm_anon_freelst+0x3d
amap_wipeout() at netbsd:amap_wipeout+0x101
uvm_unmap_detach() at netbsd:uvm_unmap_detach+0x52

panics:

[ 107.1489360] panic: kernel diagnostic assertion "pve != NULL" failed: file "../../../../arch/x86/x86/pmap.c", line 1918
[ 107.1589403] cpu5: Begin traceback...
[ 107.1589403] vpanic() at netbsd:vpanic+0x178
[ 107.1689455] kern_assert() at netbsd:kern_assert+0x48
[ 107.1689455] pmap_enter_pv() at netbsd:pmap_enter_pv+0x295
[ 107.1789498] pmap_enter_ma() at netbsd:pmap_enter_ma+0x3dd
[ 107.1889536] pmap_enter_default() at netbsd:pmap_enter_default+0x29
[ 107.1889536] uvm_fault_upper_enter.isra.6() at netbsd:uvm_fault_upper_enter.isra.6+0xcc
[ 107.1989589] uvm_fault_internal() at netbsd:uvm_fault_internal+0xb2a
[ 107.2089635] trap() at netbsd:trap+0x6f4
[ 107.2089635] --- trap (number 6) ---
[ 107.2189676] copyout() at netbsd:copyout+0x33
[ 107.2189676] elf64_copyargs() at netbsd:elf64_copyargs+0x1b
[ 107.2289730] execve_runproc() at netbsd:execve_runproc+0x4bb
[ 107.2289730] execve1() at netbsd:execve1+0x4e
[ 107.2389768] sys_execve() at netbsd:sys_execve+0x2a
[ 107.2389768] syscall() at netbsd:syscall+0x299
[ 107.2489822] --- syscall (number 59) ---
[ 107.2489822] 71c9fa842dfa:
[ 107.2489822] cpu5: End traceback...
[ 107.2589851] fatal breakpoint trap in supervisor mode
[ 107.2589851] trap type 1 code 0 rip 0xffffffff8021f55d cs 0x8 rflags 0x202 cr2 0x7f7fff28a1f0 ilevel 0 rsp 0xffffc3891bdf35b0
[ 107.2689905] curlwp 0xffffb724ccc90640 pid 6429.1 lowest kstack 0xffffc3891bdf02c0
Stopped in pid 6429.1 (ls) at   netbsd:breakpoint+0x5:  leave