Date: Sun, 02 Jun 2002 23:49:20 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: kai ouyang <oykai@msn.com> Cc: current@FreeBSD.org Subject: Re:Help: from proc to thread? Message-ID: <XFMail.20020602234920.jhb@FreeBSD.org> In-Reply-To: <OE73usjzpDr3Di32AvJ00011357@hotmail.com>
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On 03-Jun-2002 kai ouyang wrote:
> Yeah, thread is NULL.
> But I view all the callers, I did not find any assignment to td.
> I do not know the kernel how assign td to the structure.
> The RAIDFrame has the similar function as the vinum. I find this problem
> when I config a RAID level volume.
> Now, I check the raidctlioctl() function,because the process is here from user space to
> kernel space.
> Because the raidlookup's td is gotten from raidctlioctl() function.
> I add the two line to the latter function.
> KASSERT(td != NULL, ("raidctlioctl thread is NULL"));
> KASSERT(raidPtr->engine_thread != NULL, ("raidctlioctl engine thread is NULL"));
> It debugs in the second line. So, the raidctlioctl funcion has the td, but didn't
> transfer the parameter to the raidlookup().
> Hmmmm....
> I take place the two line by the following lines:
> KASSERT(td != NULL, ("raidctlioctl thread is NULL"));
> raidPtr->engine_thread = td;
> KASSERT(raidPtr->engine_thread != NULL, ("raidctlioctl engine thread is NULL"));
> now it pass.
> I want to know when the kernel assign td to raidctlioctl function?
The kernel passes the thread pointer for the current thread down the stack to
the ioctl routine.
> Now, the RAIDFrame will be crash here:
> RF_THREADGROUP_WAIT_START(&raidPtr->engine_tg);
> panic: runq_choose: process 218(raid) in state 3
> Debugger("panic")
> Stopped at Debugger+0x40: xorl %eax,%eax
It looks like you made a thread runnable and then changed it's p_stat
to SSLEEP while it was on the run queue.
--
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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