Re: panic with latest sources

On Mon, 15 Aug 2016, Nick Hudson wrote:

> Please try again with latest sources.

With sources updated as of 201608151509Z, a UVMHIST,UVMHIST_PRINT kernel
prints copious messages.

The last screen-full of kernel output reads:

uvm_map_findspace#3@0: <- got it!  (result=c000000009000000)
uvm_map_prepare#3@0: <- done!
uvm_map_enter#3@0: called!
uvm_map_enter#3@0: (map=0xffffffff808d9db8, start=0xc000000009000000, size=131072, flags=0x1723)
uvm_map_enter#3@0:   uobj/offset 0x0/0
uvm_map_enter#3@0:   allocating new map entry
uvm_mapent_alloc#2@0: called!
uvm_mapent_alloc#2@0: <- new entry=0x98000000bffe3e70 [kentry=1]
uvm_map_enter#3@0: <- done!
uvm_km_alloc#1@0: <- done valloc (kva=0x9000000)
pmap_kenter_pa#1@0: called!
pmap_kenter_pa#1@0: (va=0xc000000000000000, pa=0xbffd0000, prot=3, flags=0x40)
pmap_tlb_update_addr#1@0: called!
pmap_tlb_update_addr#1@0:  (pm=0xffffffff806c2448 va=0xc000000000000000, pte=0x82fff41f, flags=0)
pmap_tlb_update_addr#1@0:    0 <-- tlb_update_addr(0xc000000000000000, 0, 0x82fff41f, ...)
pmap_tlb_update_addr#1@0:    <-- done (rv=0)
pmap_kenter_pa#1@0:  <-- done (ptep=0x980000008098c000)
pmap_kenter_pa#2@0: called!
pmap_kenter_pa#2@0: (va=0xc000000000004000, pa=0xbffd4000, prot=3, flags=0x40)
pmap_tlb_update_addr#2@0: called!
pmap_tlb_update_addr#2@0:  (pm=0xffffffff806c2448 va=0xc000000000004000, pte=0x82fff51f, flags=0)
pmap_tlb_update_addr#2@0:    0 <-- tlb_update_addr(0xc000000000004000, 0, 0x82fff51f, ...)
pmap_tlb_update_addr#2@0:    <-- done (rv=0)
pmap_kenter_pa#2@0:  <-- done (ptep=0x980000008098c004)
pmap_update#1@0: called!
pmap_update#1@0: (pmap=0xffffffff806c2448)
pmap_update#1@0:  <-- done (kernel)
uvm_fault#1@0: called!
uvm_fault#1@0: (map=0xffffffff808d9bd8, vaddr=0xc000000000000000, at=2, ff=0)
uvm_fault_check#1@0: called!
uvm_map_lookup_entry#3@0: called!
uvm_map_lookup_entry#3@0: (map=0xffffffff808d9bd8,addr=0xc000000000000000,ent=0x98000000809e3928)
uvm_map_lookup_entry#3@0: <- search got it (0x98000000bffe3f00)
uvm_fault_check#1@0: <- no backing store, no overlay
pid 0(system): trap: cpu0, TLB miss (store) in kernel mode
status=0x20000083, cause=0x8c0c, epc=0xffffffff805a4704, vaddr=0xc000000000000000
tf=0x98000000809e3c20 ksp=0x0x98000000809e3d60 ra=0xffffffff804d6d50 ppl=0
kernel: TLB miss (store) trap
Stopped in pid 0.1 (system) at  ffffffff805a4704:         sd      a3,0(v1)
db> bt
0x98000000809e3d60: 0+ffffffff805a4704 (0,c000000000007080,7080,0) ra 0 sz 0
User-level: pid 0.1
bt>

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