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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: Thu, 13 Nov 2008 18:39:58 +0000

 Managed to reproduce today with source from Nov 13 15:31 GMT, and a slightly
 different back trace:
 panic: pmap_enter: PG_PVLIST mapping with unmanaged page pa = 0xcae9b000 
 fatal breakpoint trap in supervisor mode
 trap type 1 code 0 rip ffffffff801fb515 cs 8 rflags 246 cr2  7f7ffd800158 cpl 
0 rsp ffff80004f9147a0
 Stopped in pid 13000.1 (grotty) at      netbsd:breakpoint+0x5:  leave
 db{0}> bt
 breakpoint() at netbsd:breakpoint+0x5
 panic() at netbsd:panic+0x260
 pmap_enter() at netbsd:pmap_enter+0x791
 uvm_fault_internal() at netbsd:uvm_fault_internal+0xad9
 trap() at netbsd:trap+0x865
 --- trap (number 0) ---
 db{0}> mach cpu 1
 using CPU 1
 db{0}> bt
 uvm_page_compare_key() at netbsd:uvm_page_compare_key
 rb_tree_find_node() at netbsd:rb_tree_find_node+0x3a
 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
 uvm_fault_internal() at netbsd:uvm_fault_internal+0x110e
 trap() at netbsd:trap+0x865

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