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Re: kern/39908: pmap_remove_ptes panic

The following reply was made to PR kern/39908; it has been noted by GNATS.

From: Patrick Welche <>
Subject: Re: kern/39908: pmap_remove_ptes panic
Date: Wed, 19 Nov 2008 17:41:56 +0000

 and with today's source, a variation:
 panic: PG_ZERO page isn't zero-filled
 fatal breakpoint trap in supervisor mode
 trap type 1 code 0 rip ffffffff801fb3f5 cs 8 rflags 246 cr2  7f7ffd96a7e0 cpl 
 6 rsp ffff800053502950
 Stopped in pid 10074.1 (sh) at  netbsd:breakpoint+0x5:  leave
 db{0}> bt
 breakpoint() at netbsd:breakpoint+0x5
 panic() at netbsd:panic+0x260
 uvm_pagezerocheck() at netbsd:uvm_pagezerocheck+0x80
 uvm_pagefree() at netbsd:uvm_pagefree+0x38c
 pmap_update() at netbsd:pmap_update+0x75
 pmap_destroy() at netbsd:pmap_destroy+0x17d
 uvmspace_free() at netbsd:uvmspace_free+0xcc
 exit1() at netbsd:exit1+0x1a4
 sys_exit() at netbsd:sys_exit+0x53
 syscall() at netbsd:syscall+0xa0
 db{0}> mach cpu 1
 using CPU 1
 db{0}> bt
 rb_tree_find_node() at netbsd:rb_tree_find_node+0x2c
 uvm_pagelookup() at netbsd:uvm_pagelookup+0x29
 uvn_findpage() at netbsd:uvn_findpage+0x4b
 uvn_findpages() at netbsd:uvn_findpages+0x7c
 genfs_getpages() at netbsd:genfs_getpages+0x69c
 uvn_get() at netbsd:uvn_get+0xcf
 ubc_fault() at netbsd:ubc_fault+0x15c
 uvm_fault_internal() at netbsd:uvm_fault_internal+0x62f
 trap() at netbsd:trap+0x817
 uvm_fault(0xffffffff80a58240, 0x7f7ffda0e000, 1) -> e
 fatal page fault in supervisor mode
 trap type 6 code 0 rip ffffffff8020c61b cs 8 rflags 10247 cr2  7f7ffda0e0b8 
cpl 8 rsp ffff800053502350
 kernel: page fault trap, code=0
 Faulted in DDB; continuing...

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