On Fri, 8 Jun 2007 22:49:11 +0200
"Udo A. Steinberg" <[email protected]> wrote:
> On Fri, 8 Jun 2007 22:43:25 +0200 Ingo Molnar (IM) wrote:
>
> IM>
> IM> * Bj?rn Steinbrink <[email protected]> wrote:
> IM>
> IM> > Anyway, both are bugs and should be fixed. Maybe we're even lucky and
> IM> > it fixes your hang. *fingers crossed*
> IM>
> IM> just to make it clear: the NMI watchdog was working perfectly fine on
> IM> that box (in v2.6.21 and in dozens of kernel releases before that, for
> IM> multiple years) before Andi's cleanup patch. So lets find that bug first
> IM> or revert the cleanups.
> IM>
> IM> Ingo
>
> None of the patches posted by Bj__rn fix the kernel BUG at
> arch/i386/kernel/cpu/perfctr-watchdog.c:126! that occurs when doing
> echo 0 > /proc/sys/kernel/nmi_watchdog
>
> Call Trace:
> [<c010c429>] single_msr_unreserve+0xd/0x1a
> [<c010c668>] disable_lapic_nmi_watchdog+0x27/0x35
> [<c0110ac6>] proc_nmi_enabled+0xa0/0xbd
> [<c018550c>] proc_sys_write+0x6f/0x8c
> [<c018549d>] proc_sys_write+0x0/0x8c
> [<c0156e5b>] vfs_write+0x8a/0x10c
> [<c0157317>] sys_write+0x41/0x67
> [<c0103c30>] syscall_call+0x7/0xb
>
> Andi, did you have a patch for that?
>
This?
From: Bjorn Steinbrink <[email protected]>
Fix oops triggered during: echo 0 > /proc/sys/kernel/nmi_watchdog
The culprit seems to be 09198e68501a7e34737cd9264d266f42429abcdc:
[PATCH] i386: Clean up NMI watchdog code
In two places, the parameters to release_{evntsel,perfctr}_nmi
got interchanged during the cleanup.
Fix interchanged parameters to release_{evntsel,perfctr}_nmi.
Signed-off-by: Bjorn Steinbrink <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Michal Piotrowski <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
arch/i386/kernel/cpu/perfctr-watchdog.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff -puN arch/i386/kernel/cpu/perfctr-watchdog.c~fix-interchanged-parameters-to-release_evntselperfctr_nmi arch/i386/kernel/cpu/perfctr-watchdog.c
--- a/arch/i386/kernel/cpu/perfctr-watchdog.c~fix-interchanged-parameters-to-release_evntselperfctr_nmi
+++ a/arch/i386/kernel/cpu/perfctr-watchdog.c
@@ -276,8 +276,8 @@ static int single_msr_reserve(void)
static void single_msr_unreserve(void)
{
- release_evntsel_nmi(wd_ops->perfctr);
- release_perfctr_nmi(wd_ops->evntsel);
+ release_evntsel_nmi(wd_ops->evntsel);
+ release_perfctr_nmi(wd_ops->perfctr);
}
static void single_msr_rearm(struct nmi_watchdog_ctlblk *wd, unsigned nmi_hz)
@@ -475,10 +475,10 @@ static void p4_unreserve(void)
{
#ifdef CONFIG_SMP
if (smp_num_siblings > 1)
- release_evntsel_nmi(MSR_P4_IQ_PERFCTR1);
+ release_perfctr_nmi(MSR_P4_IQ_PERFCTR1);
#endif
- release_evntsel_nmi(MSR_P4_IQ_PERFCTR0);
- release_perfctr_nmi(MSR_P4_CRU_ESCR0);
+ release_evntsel_nmi(MSR_P4_CRU_ESCR0);
+ release_perfctr_nmi(MSR_P4_IQ_PERFCTR0);
}
static void p4_rearm(struct nmi_watchdog_ctlblk *wd, unsigned nmi_hz)
_
-
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