sparc64/71729: printf in kernel thread causes panic on SPARC

[Pyun YongHyeon]

On Tue, Sep 14, 2004 at 03:48:09PM +0000, Doug Haigh wrote:
 > 
 > >Number:         71729
 > >Category:       sparc64
 > >Synopsis:       printf in kernel thread causes panic on SPARC
 > >Confidential:   no
 > >Severity:       serious
 > >Priority:       medium
 > >Responsible:    freebsd-sparc64
 > >State:          open
 > >Quarter:        
 > >Keywords:       
 > >Date-Required:
 > >Class:          sw-bug
 > >Submitter-Id:   current-users
 > >Arrival-Date:   Tue Sep 14 15:50:17 GMT 2004
 > >Closed-Date:
 > >Last-Modified:
 > >Originator:     Doug Haigh
 > >Release:        SPARC 5.2.1
 > >Organization:
 > >Environment:
 > FreeBSD stesthost 5.2.1-RELEASE FreeBSD 5.2.1-RELEASE #12: Mon Sep 13 10:35:08 EDT 2004     cd at stesthost:/usr/src/sys/sparc64/compile/DBGKERNEL  sparc64
 > 
 > THis is an Ultra-60 dual proc machine
 > >Description:
 > I create a kernel thread in my driver using kthread_create. When the thread routine executes, it tries to print out a debug message using 'printf'. When this executes, I trap in a panic with the following trace:
 > 

I'm currently experimenting fdc(4) on sparc64. In fdc(4) it creates
a kernel thread with kthread_create(9). So I added a printf(9) in
the thread handler to see whether it panics. But it never paniced
the system and the message was displayed correctly.
This is AXe UP machine(6.0-CURRENT).

Myabe format(args. used in printf) dependent?

 > panic() at panic+0x174
 > trap() at trap+0x3b4
 > -- fast data access mmu miss tar=0 %o7=0xf000d784
 > _end() at 0xf0008fd0
 > openfirmware() at openfirmware+0x18
 > OF_write() at OF_write+0x14
 > ofw_cons_putc() at ofw_cons_putc+0x3c
 > cnputc() at cnputc+0x7c
 > putchar() at putchar+0x5c
 > kvprintf() at kvprintf+0x648
 > printf() at printf+0x4C
 > 
 > Same code works fine on i386 machines.
 > 
 > >How-To-Repeat:
 > Create a driver that creates a thread and do a printf in the thread routine.
 > >Fix:
 >       
 > >Release-Note:
 > >Audit-Trail:
 > >Unformatted:
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Regards,
Pyun YongHyeon
-- 
Pyun YongHyeon <http://www.kr.freebsd.org/~yongari>