The patch titled
spinlock-debug: all cpu backtrace
has been removed from the -mm tree. Its filename is
spinlock-debug-all-cpu-backtrace.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: spinlock-debug: all cpu backtrace
From: Andrew Morton <akpm@xxxxxxxx>
When a spinlock lockup occurs, arrange for the NMI code to emit an all-cpu
backtrace, so we get to see which CPU is holding the lock, and where.
Cc: Andi Kleen <ak@xxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Badari Pulavarty <pbadari@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/i386/kernel/nmi.c | 26 ++++++++++++++++++++++++++
arch/x86_64/kernel/nmi.c | 29 ++++++++++++++++++++++++++++-
include/asm-i386/nmi.h | 3 +++
include/asm-x86_64/nmi.h | 3 +++
include/linux/nmi.h | 5 +++++
lib/spinlock_debug.c | 4 ++++
6 files changed, 69 insertions(+), 1 deletion(-)
diff -puN arch/i386/kernel/nmi.c~spinlock-debug-all-cpu-backtrace arch/i386/kernel/nmi.c
--- a/arch/i386/kernel/nmi.c~spinlock-debug-all-cpu-backtrace
+++ a/arch/i386/kernel/nmi.c
@@ -22,6 +22,7 @@
#include <linux/percpu.h>
#include <linux/dmi.h>
#include <linux/kprobes.h>
+#include <linux/cpumask.h>
#include <asm/smp.h>
#include <asm/nmi.h>
@@ -42,6 +43,8 @@ int nmi_watchdog_enabled;
static DEFINE_PER_CPU(unsigned long, perfctr_nmi_owner);
static DEFINE_PER_CPU(unsigned long, evntsel_nmi_owner[3]);
+static cpumask_t backtrace_mask = CPU_MASK_NONE;
+
/* this number is calculated from Intel's MSR_P4_CRU_ESCR5 register and it's
* offset from MSR_P4_BSU_ESCR0. It will be the max for all platforms (for now)
*/
@@ -907,6 +910,16 @@ __kprobes int nmi_watchdog_tick(struct p
touched = 1;
}
+ if (cpu_isset(cpu, backtrace_mask)) {
+ static DEFINE_SPINLOCK(lock); /* Serialise the printks */
+
+ spin_lock(&lock);
+ printk("NMI backtrace for cpu %d\n", cpu);
+ dump_stack();
+ spin_unlock(&lock);
+ cpu_clear(cpu, backtrace_mask);
+ }
+
sum = per_cpu(irq_stat, cpu).apic_timer_irqs;
/* if the apic timer isn't firing, this cpu isn't doing much */
@@ -1033,6 +1046,19 @@ int proc_nmi_enabled(struct ctl_table *t
#endif
+void __trigger_all_cpu_backtrace(void)
+{
+ int i;
+
+ backtrace_mask = cpu_online_map;
+ /* Wait for up to 10 seconds for all CPUs to do the backtrace */
+ for (i = 0; i < 10 * 1000; i++) {
+ if (cpus_empty(backtrace_mask))
+ break;
+ mdelay(1);
+ }
+}
+
EXPORT_SYMBOL(nmi_active);
EXPORT_SYMBOL(nmi_watchdog);
EXPORT_SYMBOL(avail_to_resrv_perfctr_nmi);
diff -puN arch/x86_64/kernel/nmi.c~spinlock-debug-all-cpu-backtrace arch/x86_64/kernel/nmi.c
--- a/arch/x86_64/kernel/nmi.c~spinlock-debug-all-cpu-backtrace
+++ a/arch/x86_64/kernel/nmi.c
@@ -12,14 +12,15 @@
* Mikael Pettersson : PM converted to driver model. Disable/enable API.
*/
+#include <linux/nmi.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/sysdev.h>
-#include <linux/nmi.h>
#include <linux/sysctl.h>
#include <linux/kprobes.h>
+#include <linux/cpumask.h>
#include <asm/smp.h>
#include <asm/nmi.h>
@@ -41,6 +42,8 @@ int panic_on_unrecovered_nmi;
static DEFINE_PER_CPU(unsigned, perfctr_nmi_owner);
static DEFINE_PER_CPU(unsigned, evntsel_nmi_owner[2]);
+static cpumask_t backtrace_mask = CPU_MASK_NONE;
+
/* this number is calculated from Intel's MSR_P4_CRU_ESCR5 register and it's
* offset from MSR_P4_BSU_ESCR0. It will be the max for all platforms (for now)
*/
@@ -782,6 +785,7 @@ int __kprobes nmi_watchdog_tick(struct p
{
int sum;
int touched = 0;
+ int cpu = smp_processor_id();
struct nmi_watchdog_ctlblk *wd = &__get_cpu_var(nmi_watchdog_ctlblk);
u64 dummy;
int rc=0;
@@ -799,6 +803,16 @@ int __kprobes nmi_watchdog_tick(struct p
touched = 1;
}
+ if (cpu_isset(cpu, backtrace_mask)) {
+ static DEFINE_SPINLOCK(lock); /* Serialise the printks */
+
+ spin_lock(&lock);
+ printk("NMI backtrace for cpu %d\n", cpu);
+ dump_stack();
+ spin_unlock(&lock);
+ cpu_clear(cpu, backtrace_mask);
+ }
+
#ifdef CONFIG_X86_MCE
/* Could check oops_in_progress here too, but it's safer
not too */
@@ -931,6 +945,19 @@ int proc_nmi_enabled(struct ctl_table *t
#endif
+void __trigger_all_cpu_backtrace(void)
+{
+ int i;
+
+ backtrace_mask = cpu_online_map;
+ /* Wait for up to 10 seconds for all CPUs to do the backtrace */
+ for (i = 0; i < 10 * 1000; i++) {
+ if (cpus_empty(backtrace_mask))
+ break;
+ mdelay(1);
+ }
+}
+
EXPORT_SYMBOL(nmi_active);
EXPORT_SYMBOL(nmi_watchdog);
EXPORT_SYMBOL(avail_to_resrv_perfctr_nmi);
diff -puN include/asm-i386/nmi.h~spinlock-debug-all-cpu-backtrace include/asm-i386/nmi.h
--- a/include/asm-i386/nmi.h~spinlock-debug-all-cpu-backtrace
+++ a/include/asm-i386/nmi.h
@@ -42,4 +42,7 @@ extern int proc_nmi_enabled(struct ctl_t
void __user *, size_t *, loff_t *);
extern int unknown_nmi_panic;
+void __trigger_all_cpu_backtrace(void);
+#define trigger_all_cpu_backtrace() __trigger_all_cpu_backtrace()
+
#endif /* ASM_NMI_H */
diff -puN include/asm-x86_64/nmi.h~spinlock-debug-all-cpu-backtrace include/asm-x86_64/nmi.h
--- a/include/asm-x86_64/nmi.h~spinlock-debug-all-cpu-backtrace
+++ a/include/asm-x86_64/nmi.h
@@ -77,4 +77,7 @@ extern int proc_nmi_enabled(struct ctl_t
extern int unknown_nmi_panic;
+void __trigger_all_cpu_backtrace(void);
+#define trigger_all_cpu_backtrace() __trigger_all_cpu_backtrace()
+
#endif /* ASM_NMI_H */
diff -puN include/linux/nmi.h~spinlock-debug-all-cpu-backtrace include/linux/nmi.h
--- a/include/linux/nmi.h~spinlock-debug-all-cpu-backtrace
+++ a/include/linux/nmi.h
@@ -15,9 +15,14 @@
* disables interrupts for a long time. This call is stateless.
*/
#ifdef ARCH_HAS_NMI_WATCHDOG
+#include <asm/nmi.h>
extern void touch_nmi_watchdog(void);
#else
# define touch_nmi_watchdog() touch_softlockup_watchdog()
#endif
+#ifndef trigger_all_cpu_backtrace
+#define trigger_all_cpu_backtrace() do { } while (0)
+#endif
+
#endif
diff -puN lib/spinlock_debug.c~spinlock-debug-all-cpu-backtrace lib/spinlock_debug.c
--- a/lib/spinlock_debug.c~spinlock-debug-all-cpu-backtrace
+++ a/lib/spinlock_debug.c
@@ -7,6 +7,7 @@
*/
#include <linux/spinlock.h>
+#include <linux/nmi.h>
#include <linux/interrupt.h>
#include <linux/debug_locks.h>
#include <linux/delay.h>
@@ -117,6 +118,9 @@ static void __spin_lock_debug(spinlock_t
raw_smp_processor_id(), current->comm,
current->pid, lock);
dump_stack();
+#ifdef CONFIG_SMP
+ trigger_all_cpu_backtrace();
+#endif
}
}
}
_
Patches currently in -mm which might be from akpm@xxxxxxxx are
origin.patch
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separate-bdi-congestion-functions-from-queue-congestion-functions.patch
revert-generic_file_buffered_write-handle-zero-length-iovec-segments.patch
revert-generic_file_buffered_write-deadlock-on-vectored-write.patch
generic_file_buffered_write-cleanup.patch
mm-fix-pagecache-write-deadlocks.patch
i386-acpi-build-fix.patch
acpi-cpufreq-remove-dead-code.patch
acpi-asus-s3-resume-fix.patch
sony_apci-resume.patch
speedstep-centrino-remove-dead-code.patch
revert-gregkh-driver-driver-core-fixes-sysfs_create_group-retval-in-topology.c.patch
git-dvb.patch
git-dvb-fixup.patch
git-ia64.patch
git-input-fixup.patch
git-libata-all.patch
mtd-maps-support-for-bios-flash-chips-on-intel-esb2-southbridge.patch
git-netdev-all.patch
libphy-dont-do-that.patch
drivers-net-ns83820c-add-paramter-to-disable-auto.patch
git-pcmcia-fixup.patch
git-serial-fixup.patch
revert-gregkh-pci-pci-check-that-mwi-bit-really-did-get-set.patch
git-scsi-target-fixup.patch
git-scsi-target-vs-git-block.patch
usb-gadget-net2280-handle-sysfs-errors-fix.patch
git-watchdog.patch
x86_64-dump_trace-atomicity-fix.patch
unwinder-speedup-tweaks.patch
xfs-rename-uio_read.patch
touchkit-ps-2-touchscreen-driver.patch
get-rid-of-zone_table.patch
new-scheme-to-preempt-swap-token-tidy.patch
balance_pdgat-cleanup.patch
radix-tree-rcu-lockless-readside.patch
acx1xx-wireless-driver.patch
swsusp-add-resume_offset-command-line-parameter-rev-2.patch
deprecate-smbfs-in-favour-of-cifs.patch
edac-new-opteron-athlon64-memory-controller-driver.patch
kbuild-dont-put-temp-files-in-the-source-tree.patch
lockdep-annotate-nfs-nfsd-in-kernel-sockets-tidy.patch
drivers-add-lcd-support-3-Kconfig-fix.patch
fsstack-introduce-fsstack_copy_attrinode_-tidy.patch
bug-test-1.patch
log2-implement-a-general-integer-log2-facility-in-the-kernel-fix.patch
log2-implement-a-general-integer-log2-facility-in-the-kernel-vs-git-cryptodev.patch
fs-cache-provide-a-filesystem-specific-syncable-page-bit-ext4.patch
fs-cache-make-kafs-use-fs-cache-fix.patch
fs-cache-make-kafs-use-fs-cache-vs-streamline-generic_file_-interfaces-and-filemap.patch
nfs-use-local-caching-12-fix.patch
fs-cache-cachefiles-a-cache-that-backs-onto-a-mounted-filesystem-log2-fix.patch
swap_prefetch-vs-zoned-counters.patch
readahead-sysctl-parameters.patch
make-copy_from_user_inatomic-not-zero-the-tail-on-i386-vs-reiser4.patch
make-kmem_cache_destroy-return-void-reiser4.patch
reiser4-hardirq-include-fix.patch
reiser4-run-truncate_inode_pages-in-reiser4_delete_inode.patch
reiser4-get_sb_dev-fix.patch
reiser4-vs-zoned-allocator.patch
hpt3xx-rework-rate-filtering-tidy.patch
gtod-persistent-clock-support-i386.patch
hrtimers-state-tracking.patch
clockevents-drivers-for-i386.patch
gtod-mark-tsc-unusable-for-highres-timers.patch
round_jiffies-infrastructure-fix.patch
kevent-core-files-fix.patch
kevent-core-files-s390-hack.patch
kevent-socket-notifications-fix-2.patch
kevent-socket-notifications-fix-4.patch
kevent-timer-notifications-fix.patch
nr_blockdev_pages-in_interrupt-warning.patch
device-suspend-debug.patch
mutex-subsystem-synchro-test-module-fix.patch
slab-leaks3-default-y.patch
x86-kmap_atomic-debugging.patch
restore-rogue-readahead-printk.patch
put_bh-debug.patch
acpi_format_exception-debug.patch
jmicron-warning-fix.patch
squash-ipc-warnings.patch
squash-udf-warnings.patch
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