Date: Tue, 14 Sep 2004 15:48:09 GMT From: Doug Haigh <cd_freebsd@gatorzone.com> To: freebsd-gnats-submit@FreeBSD.org Subject: sparc64/71729: printf in kernel thread causes panic on SPARC Message-ID: <200409141548.i8EFm998087028@www.freebsd.org> Resent-Message-ID: <200409141550.i8EFoH2B066969@freefall.freebsd.org>
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>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@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:
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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