Re: kern/41261: Crash with nullfs

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

The following reply was made to PR kern/41261; it has been noted by GNATS.

From: Andrew Doran <ad%netbsd.org@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
        netbsd-bugs%netbsd.org@localhost
Subject: Re: kern/41261: Crash with nullfs
Date: Wed, 22 Apr 2009 20:52:04 +0000

 On Tue, Apr 21, 2009 at 07:45:00PM +0000, joerg%NetBSD.org@localhost wrote:
 
 > fatal breakpoint trap in supervisor mode
 > trap type 1 code 0 rip ffffffff80518b75 cs 8 rflags 246 cr2  7f7ffd96cf00 
 > cpl 
 > Stopped in pid 778.1 (mount_null) at    netbsd:breakpoint+0x5:  leave
 > db{3}> bt
 > breakpoint() at netbsd:breakpoint+0x5
 > cpu_Debugger() at netbsd:cpu_Debugger+0x9
 > panic() at netbsd:panic+0x24d
 > __kernassert() at netbsd:__kernassert+0x2d
 > uvm_pagealloc_strat() at netbsd:uvm_pagealloc_strat+0x549
 > pmap_growkernel() at netbsd:pmap_growkernel+0x322
 > uvm_map_prepare() at netbsd:uvm_map_prepare+0x230
 > uvm_map() at netbsd:uvm_map+0xd0
 > uvm_km_alloc() at netbsd:uvm_km_alloc+0xa8
 > kmem_backend_alloc() at netbsd:kmem_backend_alloc+0x76
 > vmem_xalloc() at netbsd:vmem_xalloc+0x3fc
 > vmem_alloc() at netbsd:vmem_alloc+0xf2
 > kmem_alloc() at netbsd:kmem_alloc+0x3d
 > hashinit() at netbsd:hashinit+0x56
 > nullfs_mount() at netbsd:nullfs_mount+0x176
 > VFS_MOUNT() at netbsd:VFS_MOUNT+0x44
 > do_sys_mount() at netbsd:do_sys_mount+0x625
 > sys___mount50() at netbsd:sys___mount50+0x33
 > syscall() at netbsd:syscall+0xb6
 
 ptp_va2o() can return duplicate offsets for the same uvm_object?
 Or there is a bug in its use? I'd be somewhat surprised.