Date: Fri, 26 Jul 2002 13:58:55 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: andrew bliznak <andrew@ort.lviv.net> Cc: Peter Schultz <peter@jocose.org>, Alex Zepeda <zipzippy@sonic.net>, current@FreeBSD.org Subject: Re: I think X is making this whole thing unstable.. Message-ID: <XFMail.20020726135855.jhb@FreeBSD.org> In-Reply-To: <3D418599.6000108@ort.lviv.net>
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On 26-Jul-2002 andrew bliznak wrote:
> John Baldwin wrote:
>> On 26-Jul-2002 andrew bliznak wrote:
>>
>>>#14 0xc03179d8 in calltrap () at {standard input}:98
>>>#15 0xc01e4db5 in _mtx_lock_sleep (m=0x28, opts=0, file=0x0, line=0)
>>> at /usr/home/andrew/C/src/sys/kern/kern_mutex.c:598
>>
>>
>> This is the bug, it's like it is dereferencing a null pointer to get
>> a mutex or something.
>>
>>
>>>#16 0xc026f71d in tcp_input (m=0xc0f10100, off0=20)
>>> at /usr/home/andrew/C/src/sys/netinet/tcp_input.c:520
>>
>>
>> /*
>> * Locate pcb for segment.
>> */
>> INP_INFO_WLOCK(&tcbinfo);
>> headlocked = 1;
>>
>> #define INP_INFO_WLOCK(ipi) mtx_lock(&(ipi)->ipi_mtx)
>>
>> I don't see why it should be a problem though, tcbinfo is a global
>> var.
>
> Hm, little more debuging, m in sys/kern/kern_mutex.c:595 is wrong!
It's wrong on the stack. Look at the _mtx_lock_sleep() line above.
I would say print the value of m in gdb, but gdb doesn't always get
local variables right (maybe the new gcc and dwarf stuff isn't subject
to that).
Actually, I think gdb has screwed up your backtrace some anyway. Back
to the original fault messages:
fault virtual address = 0x24
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc01e4b02
Can you do 'l *0xc01e4b02' in gdb and show the output?
--
John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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