bugDazuko - Bugs: bug #16161, Dazuko (2.2.0) module "page...


bug #16161: Dazuko (2.2.0) module "page fault" on FreeBSD 6.x

Submitter:  None
Submitted:  Wed 22 Mar 2006 06:54:05 PM UTC
Status:  None Assigned to:  None
Open/Closed:  Open
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Mon 27 Mar 2006 04:27:00 PM UTC, comment #1: 

Dazuko uses namei(9) during initialization in order to grab the "true" root path. However, at such an early phase of booting this is not possible and namei(9) simply dies. Building in a detection for this will not be simple.

This bug exists for all versions of Dazuko for FreeBSD.

Dazuko must be loaded sometime after the root filesystem has been mounted.

With the upcoming Dazuko 3.0 (which is already available as an early preview in CVS) Dazuko will not have this problem because it is not interested in capturing the file system root.

John Ogness <ogman>
Group administrator
Wed 22 Mar 2006 06:54:05 PM UTC, original submission:  

The dazuko module generated a "page fault" while loading the module at boot time. I can't catch core dump.

Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x4c
fault code              = supervisor read, page not present
instruction pointer     = 0x20:0xc0664710
stack pointer           = 0x28:0xc1020c30
frame pointer           = 0x28:0xc1020c68
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 0 (swapper)
trap number = 12
panic fault

HellFire# addr2line -e kernel.debug 0xc0664710

HellFire# nm -n kernel.debug | grep c0664
c0664020 t zone_drain
c0664310 T uma_zfree_arg
c06646d0 T uma_zalloc_arg
c0664d30 T uma_zdestroy
c0664d60 t zone_dtor

HellFire# cat /boot/loader.conf

The error is only on boot process (kldload and kldunload runs without problems)



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    Date Changed by Updated Field Previous Value => Replaced by
    2011-03-19 ogman Assigned toogman None
    2006-03-27 ogman Assigned toNone ogman

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