@@ -293,7 +293,7 @@ static unsigned long oops_begin(void)
static void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
{
if (regs && kexec_should_crash(current))
- crash_kexec(regs);
+ crash_kexec_on_oops(regs, current);
bust_spinlocks(0);
die_owner = -1;
@@ -233,7 +233,7 @@ void die(const char *str, struct pt_regs *regs, int err)
ret = __die(str, err, thread, regs);
if (regs && kexec_should_crash(thread->task))
- crash_kexec(regs);
+ crash_kexec_on_oops(regs, thread->task);
bust_spinlocks(0);
add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
@@ -110,7 +110,7 @@ void __noreturn die(const char *str, struct pt_regs *regs,
bust_spinlocks(0);
add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
if (kexec_should_crash(current))
- crash_kexec(regs);
+ crash_kexec_on_oops(regs, current);
if (in_interrupt())
panic("Fatal exception in interrupt");
@@ -402,7 +402,7 @@ void __noreturn die(const char *str, struct pt_regs *regs)
}
if (regs && kexec_should_crash(current))
- crash_kexec(regs);
+ crash_kexec_on_oops(regs, current);
do_exit(sig);
}
@@ -163,7 +163,7 @@ static void __kprobes oops_end(unsigned long flags, struct pt_regs *regs,
* it through the crashdump code.
*/
if (kexec_should_crash(current) || (TRAP(regs) == 0x100)) {
- crash_kexec(regs);
+ crash_kexec_on_oops(regs, current);
/*
* We aren't the primary crash CPU. We need to send it
@@ -1726,7 +1726,7 @@ static void __do_restart(void *ignore)
__arch_local_irq_stosm(0x04); /* enable DAT */
smp_send_stop();
#ifdef CONFIG_CRASH_DUMP
- crash_kexec(NULL);
+ crash_kexec(NULL, "restart");
#endif
on_restart_trigger.action->fn(&on_restart_trigger);
stop_run(&on_restart_trigger);
@@ -43,7 +43,7 @@ void die(const char *str, struct pt_regs *regs, long err)
oops_exit();
if (kexec_should_crash(current))
- crash_kexec(regs);
+ crash_kexec_on_oops(regs, current);
if (in_interrupt())
panic("Fatal exception in interrupt");
@@ -229,7 +229,7 @@ unsigned long oops_begin(void)
void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
{
if (regs && kexec_should_crash(current))
- crash_kexec(regs);
+ crash_kexec_on_oops(regs, current);
bust_spinlocks(0);
die_owner = -1;
@@ -499,7 +499,7 @@ static void uv_nmi_kdump(int cpu, int master, struct pt_regs *regs)
/* Call crash to dump system state */
if (master) {
pr_emerg("UV: NMI executing crash_kexec on CPU%d\n", cpu);
- crash_kexec(regs);
+ crash_kexec(regs, "UV: NMI executing crash_kexec");
pr_emerg("UV: crash_kexec unexpectedly returned, ");
if (!kexec_crash_image) {
@@ -237,7 +237,8 @@ extern int kexec_purgatory_get_set_symbol(struct kimage *image,
unsigned int size, bool get_value);
extern void *kexec_purgatory_get_symbol_addr(struct kimage *image,
const char *name);
-extern void crash_kexec(struct pt_regs *);
+extern void crash_kexec(struct pt_regs *, char *msg);
+extern void crash_kexec_on_oops(struct pt_regs *, struct task_struct *p);
int kexec_should_crash(struct task_struct *);
void crash_save_cpu(struct pt_regs *regs, int cpu);
void crash_save_vmcoreinfo(void);
@@ -321,7 +322,9 @@ int parse_crashkernel_low(char *cmdline, unsigned long long system_ram,
#else /* !CONFIG_KEXEC */
struct pt_regs;
struct task_struct;
-static inline void crash_kexec(struct pt_regs *regs) { }
+static inline void crash_kexec(struct pt_regs *regs, char *msg) { }
+static inline void crash_kexec_on_oops(struct pt_regs *regs,
+ struct task_struct *p) { }
static inline int kexec_should_crash(struct task_struct *p) { return 0; }
#endif /* CONFIG_KEXEC */
@@ -1470,7 +1470,7 @@ void __weak crash_unmap_reserved_pages(void)
#endif /* CONFIG_KEXEC_FILE */
-void crash_kexec(struct pt_regs *regs)
+void crash_kexec(struct pt_regs *regs, char *msg)
{
/* Take the kexec_mutex here to prevent sys_kexec_load
* running on one cpu from replacing the crash kernel
@@ -1493,6 +1493,27 @@ void crash_kexec(struct pt_regs *regs)
}
}
+void crash_kexec_on_oops(struct pt_regs *regs, struct task_struct *p)
+{
+ static char buf[128];
+ char *msg = "Die for unknown reason";
+
+ if (in_interrupt())
+ msg = "Fatal exception in interrupt";
+ else if (panic_on_oops)
+ msg = "Fatal exception";
+ else if (!p->pid)
+ msg = "Attempted to kill the idle task!";
+ else if (is_global_init(p)) {
+ snprintf(buf, sizeof(buf),
+ "Attempted to kill init! exitcode=0x%08x",
+ p->signal->group_exit_code ?: p->exit_code);
+ msg = buf;
+ }
+
+ crash_kexec(regs, msg);
+}
+
size_t crash_get_memory_size(void)
{
size_t size = 0;
@@ -118,7 +118,7 @@ void panic(const char *fmt, ...)
* the "crash_kexec_post_notifiers" option to the kernel.
*/
if (!crash_kexec_post_notifiers)
- crash_kexec(NULL);
+ crash_kexec(NULL, buf);
/*
* Note smp_send_stop is the usual smp shutdown function, which
@@ -143,7 +143,7 @@ void panic(const char *fmt, ...)
* more unstable, it can increase risks of the kdump failure too.
*/
if (crash_kexec_post_notifiers)
- crash_kexec(NULL);
+ crash_kexec(NULL, buf);
bust_spinlocks(0);
Add an argument to crash_kexec() to pass the panic message. This patch is a preparation for the next patch, and it doesn't change the current behavior. Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Vivek Goyal <vgoyal@redhat.com> --- arch/arm/kernel/traps.c | 2 +- arch/arm64/kernel/traps.c | 2 +- arch/metag/kernel/traps.c | 2 +- arch/mips/kernel/traps.c | 2 +- arch/powerpc/kernel/traps.c | 2 +- arch/s390/kernel/ipl.c | 2 +- arch/sh/kernel/traps.c | 2 +- arch/x86/kernel/dumpstack.c | 2 +- arch/x86/platform/uv/uv_nmi.c | 2 +- include/linux/kexec.h | 7 +++++-- kernel/kexec.c | 23 ++++++++++++++++++++++- kernel/panic.c | 4 ++-- 12 files changed, 38 insertions(+), 14 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-sh" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html