Date: Thu, 19 May 2005 16:55:45 +1000 From: Peter Jeremy <PeterJeremy@optushome.com.au> To: Jamie Heckford <jamie@tridentmicrosystems.co.uk> Cc: freebsd-stable@freebsd.org Subject: Re: 5.4-RC2 freezing - ATA related? Message-ID: <20050519065544.GC2129@cirb503493.alcatel.com.au> In-Reply-To: <20050518231544.GA13555@nipples.trident-uk.co.uk> References: <001801c55a14$609720d0$37cba1cd@emerytelcom.com> <20050518150316.GA11987@nipples.trident-uk.co.uk> <20050518195312.GB2129@cirb503493.alcatel.com.au> <20050518222937.GA13356@nipples.trident-uk.co.uk> <20050518155452.M87264@carver.gumbysoft.com> <20050518231544.GA13555@nipples.trident-uk.co.uk>
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Previously posted trap frame:
#5 0xc0691771 in trap (frame=
{tf_fs = -1068433384, tf_es = -989790192, tf_ds = 16, tf_edi = -106612473
6, tf_esi = -1066124736, tf_ebp = -323699844, tf_isp = -323699872, tf_ebx = -10
07063716, tf_edx = 528, tf_ecx = -1013235680, tf_eax = 307472464, tf_trapno = 1
2, tf_err = 2, tf_eip = -1067870386, tf_cs = 8, tf_eflags = 66050, tf_esp = -98
9760240, tf_ss = -1007063716}) at /usr/src/sys/i386/i386/trap.c:425
On Thu, 2005-May-19 00:15:44 +0100, Jamie Heckford wrote:
>Fatal trap 12: page fault while in kernel mode
>fault virtual address = 0x214
That's a NULL pointer somewhere. The trap frame shows %edx is 528 so
the code has presumably tried to dereference %edx but it's not clear
how %edx would up with that value.
>fault code = supervisor write, page not present
>instruction pointer = 0x8:0xc059974e
>stack pointer = 0x10:0xecb4bb74
>frame pointer = 0x10:0xecb4bb7c
This instruction pointer matches the trap frame but not the traceback
you posted. The trap frame gives the stack pointer as 0xC5017510
(which is nonsense) with a nonsense stack segment but the frame
pointer matches. Having the frame pointer above the stack pointer
is also unusual.
It looks like gdb is a bit confused. You could try:
disasm 0xc059974e
x/x 0xecb4bb74
Does the instruction either at or immediately before 0xc059974e
include [%edx]? What function is it in and can you work out the
line number? Does the address reported by the x/x match anything
in the backtrace?
--
Peter Jeremy
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