http://defect.opensolaris.org/bz/show_bug.cgi?id=6113
Summary: ASUS N4L-VM DH: panic in cpudrv_pm_set_topspeed
Classification: Development
Product: power-mgmt
Version: unspecified
Platform: i86pc/amd64
OS/Version: Solaris
Status: NEW
Severity: major
Priority: P2
Component: c-state
AssignedTo: bill.holler at sun.com
ReportedBy: jk at tools.de
CC: tesla-dev at opensolaris.org
System is a ASUS N4L-VM DH mainboard, using BIOS revision 0902;
Intel Core2 Duo T7200 64-bit cpu, 2GB memory.
When booting snv_106 on this system, the kernel crashes with a panic.
USB keyboard does not work at the time of the panic, but the stack backtrace
visible on the console is:
cpudrv_pm_set_topspeed+8d()
ppm_set_topspeed+32()
ppm_redefine_topspeed+3c()
ppm_init_topspeed+3c()
cpudrv_post_startup+32()
main+2da()
cpudrv_pm_set_topspeed+0x88: call +0x350547b <mutex_exit>
cpudrv_pm_set_topspeed+0x8d: movl 0x30(%r15),%edx
cpudrv_pm_set_topspeed+0x91: movq %r12,%rdi
cpudrv_pm_set_topspeed+0x94: xorl %esi,%esi
cpudrv_pm_set_topspeed+0x96: call +0x375fbc5 <pm_update_maxpower>
I do see that the panic register dump contains 'r15 == 0'
cpudrv_pm_set_topspeed+8d() should translate to
usr/src/uts/i86pc/io/cpudrv/cpudrv_mach.c, line 309:
268 void
269 cpudrv_pm_set_topspeed(void *ctx, int plat_level)
270 {
271 cpudrv_devstate_t *cpudsp;
272 cpudrv_pm_t *cpupm;
273 cpudrv_pm_spd_t *spd;
274 cpudrv_pm_spd_t *top_spd;
275 dev_info_t *dip;
276 int pm_level;
277 int instance;
278 int i;
279
280 dip = ctx;
281 instance = ddi_get_instance(dip);
282 cpudsp = ddi_get_soft_state(cpudrv_state, instance);
283 ASSERT(cpudsp != NULL);
284
285 mutex_enter(&cpudsp->lock);
286 cpupm = &(cpudsp->cpudrv_pm);
287 pm_level = PLAT_2_PM_LEVEL(cpupm, plat_level);
288 for (i = 0, spd = cpupm->head_spd; spd; i++, spd =
spd->down_spd) {
289 /*
290 * Don't mess with speeds that are higher than the new
291 * top speed. They should be out of range anyway.
292 */
293 if (spd->pm_level > pm_level)
294 continue;
295 /*
296 * This is the new top speed.
297 */
298 if (spd->pm_level == pm_level)
299 top_spd = spd;
300
301 spd->up_spd = top_spd;
302 }
303 cpupm->top_spd = top_spd;
304
305 cpupm->pm_governor_thread = curthread;
306
307 mutex_exit(&cpudsp->lock);
308
309 (void) pm_update_maxpower(dip, 0, top_spd->pm_level);
It seems that we crash because "top_spd == NULL".
Hmm, looking at the above code: shouldn't the compiler or lint have warned
that variable "top_spd" at line 309 could be uninitialized?
Btw. I just checked, 0902 is the latest RELEASE version of the BIOS;
but there are BETA BIOS versions available on ASUS' website
that are newer. In fact BETA BIOS 0905 is supposed to fix
enhanced speedstep issues for Windows Vista, and (IIRC) flashing it
avoids the panic for Solaris, too.
Workaround:
Boot with -B disable-cpudrv=true
(Or flash the beta bios)
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