Re: [PATCH] Report that kernel is tainted if there were an OOPS before (v2)

[Pavel Emelianov <xemul@openvz.org>]

Jan Engelhardt wrote:
> This seems to have died and remain unmerged as of yet... resubmit?

Yes. I remember this. I will rework the patch in a few days.

Thanks,
Pavel

> 
> On Apr 17 2007 12:58, Pavel Emelianov wrote:
> 
>> Date: Tue, 17 Apr 2007 12:58:47 +0400
>> From: Pavel Emelianov <xemul@sw.ru>
>> To: Andrew Morton <akpm@osdl.org>,
>>    Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
>>    linux-arch@vger.kernel.org
>> Cc: randy.dunlap@oracle.com, devel@openvz.org
>> Subject: [PATCH] Report that kernel is tainted if there were an OOPS before
>>    (v2)
>>
>> If the kernel OOPS-ed or BUG-ed then it probably should
>> considered as tainted. Use die_counter introduced by many
>> architectures to determine whether or not the kernel died.
>>
>> This saves a lot of time explaining oddities in the
>> calltrace seen via SysRq-P.
>>
>> Signed-off-by: Pavel Emelianov <xemul@openvz.org>
>> Signed-off-by: Kirill Korotaev <dev@openvz.org>
>> Cc: Randy Dunlap <randy.dunlap@oracle.com>
>>
>> ---
>>
>> diff --git a/Documentation/oops-tracing.txt b/Documentation/oops-tracing.txt
>> index ea55ea8..dddbfe0 100644
>> --- a/Documentation/oops-tracing.txt
>> +++ b/Documentation/oops-tracing.txt
>> @@ -240,6 +240,10 @@ characters, each representing a particul
>>   7: 'U' if a user or user application specifically requested that the
>>      Tainted flag be set, ' ' otherwise.
>>
>> +  8: 'D' if a kernel has died recently, i.e. there was an OOPS or BUG
>> +      before, ' ' otherwise. This is useful when seeing the calltrace
>> +      from SysRq-P output.
>> +
>> The primary reason for the 'Tainted: ' string is to tell kernel
>> debuggers if this is a clean kernel or if anything unusual has
>> occurred.  Tainting is permanent: even if an offending module is
>> diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
>> index b3ffba1..764526c 100644
>> --- a/arch/arm/kernel/traps.c
>> +++ b/arch/arm/kernel/traps.c
>> @@ -207,7 +207,6 @@ void show_stack(struct task_struct *tsk,
>> static void __die(const char *str, int err, struct thread_info *thread, struct pt_regs *regs)
>> {
>> 	struct task_struct *tsk = thread->task;
>> -	static int die_counter;
>>
>> 	printk("Internal error: %s: %x [#%d]\n", str, err, ++die_counter);
>> 	print_modules();
>> diff --git a/arch/avr32/kernel/traps.c b/arch/avr32/kernel/traps.c
>> index c8b7153..0829ebc 100644
>> --- a/arch/avr32/kernel/traps.c
>> +++ b/arch/avr32/kernel/traps.c
>> @@ -156,8 +156,6 @@ static DEFINE_SPINLOCK(die_lock);
>>
>> void NORET_TYPE die(const char *str, struct pt_regs *regs, long err)
>> {
>> -	static int die_counter;
>> -
>> 	console_verbose();
>> 	spin_lock_irq(&die_lock);
>> 	bust_spinlocks(1);
>> diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
>> index 35d1c38..8531901 100644
>> --- a/arch/i386/kernel/traps.c
>> +++ b/arch/i386/kernel/traps.c
>> @@ -438,7 +438,6 @@ void die(const char * str, struct pt_reg
>> 		.lock_owner =		-1,
>> 		.lock_owner_depth =	0
>> 	};
>> -	static int die_counter;
>> 	unsigned long flags;
>>
>> 	oops_enter();
>> diff --git a/arch/ia64/kernel/traps.c b/arch/ia64/kernel/traps.c
>> index 5bfb8be..7a1e8d8 100644
>> --- a/arch/ia64/kernel/traps.c
>> +++ b/arch/ia64/kernel/traps.c
>> @@ -47,7 +47,6 @@ die (const char *str, struct pt_regs *re
>> 		.lock_owner =		-1,
>> 		.lock_owner_depth =	0
>> 	};
>> -	static int die_counter;
>> 	int cpu = get_cpu();
>>
>> 	if (die.lock_owner != cpu) {
>> diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
>> index 27c53f1..2c65120 100644
>> --- a/arch/mips/kernel/traps.c
>> +++ b/arch/mips/kernel/traps.c
>> @@ -312,7 +312,6 @@ static DEFINE_SPINLOCK(die_lock);
>>
>> NORET_TYPE void ATTRIB_NORET die(const char * str, struct pt_regs * regs)
>> {
>> -	static int die_counter;
>> #ifdef CONFIG_MIPS_MT_SMTC
>> 	unsigned long dvpret = dvpe();
>> #endif /* CONFIG_MIPS_MT_SMTC */
>> diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
>> index bf6445a..13bc4c7 100644
>> --- a/arch/powerpc/kernel/traps.c
>> +++ b/arch/powerpc/kernel/traps.c
>> @@ -105,7 +105,6 @@ int die(const char *str, struct pt_regs 
>> 		.lock_owner =		-1,
>> 		.lock_owner_depth =	0
>> 	};
>> -	static int die_counter;
>> 	unsigned long flags;
>>
>> 	if (debugger(regs))
>> diff --git a/arch/ppc/kernel/traps.c b/arch/ppc/kernel/traps.c
>> index 810f7aa..3a058fb 100644
>> --- a/arch/ppc/kernel/traps.c
>> +++ b/arch/ppc/kernel/traps.c
>> @@ -76,7 +76,6 @@ DEFINE_SPINLOCK(die_lock);
>>
>> int die(const char * str, struct pt_regs * fp, long err)
>> {
>> -	static int die_counter;
>> 	int nl = 0;
>> 	console_verbose();
>> 	spin_lock_irq(&die_lock);
>> diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
>> index 90ca82b..659f41c 100644
>> --- a/arch/s390/kernel/traps.c
>> +++ b/arch/s390/kernel/traps.c
>> @@ -251,8 +251,6 @@ static DEFINE_SPINLOCK(die_lock);
>>
>> void die(const char * str, struct pt_regs * regs, long err)
>> {
>> -	static int die_counter;
>> -
>> 	debug_stop_all();
>> 	console_verbose();
>> 	spin_lock_irq(&die_lock);
>> diff --git a/arch/sh/kernel/traps.c b/arch/sh/kernel/traps.c
>> index e9f168f..38ae9de 100644
>> --- a/arch/sh/kernel/traps.c
>> +++ b/arch/sh/kernel/traps.c
>> @@ -78,8 +78,6 @@ DEFINE_SPINLOCK(die_lock);
>>
>> void die(const char * str, struct pt_regs * regs, long err)
>> {
>> -	static int die_counter;
>> -
>> 	console_verbose();
>> 	spin_lock_irq(&die_lock);
>> 	bust_spinlocks(1);
>> diff --git a/arch/sparc/kernel/traps.c b/arch/sparc/kernel/traps.c
>> index dc9ffea..b9b4ddd 100644
>> --- a/arch/sparc/kernel/traps.c
>> +++ b/arch/sparc/kernel/traps.c
>> @@ -89,7 +89,6 @@ void instruction_dump (unsigned long *pc
>>
>> void die_if_kernel(char *str, struct pt_regs *regs)
>> {
>> -	static int die_counter;
>> 	int count = 0;
>>
>> 	/* Amuse the user. */
>> diff --git a/arch/sparc64/kernel/traps.c b/arch/sparc64/kernel/traps.c
>> index dc652f2..556189b 100644
>> --- a/arch/sparc64/kernel/traps.c
>> +++ b/arch/sparc64/kernel/traps.c
>> @@ -2208,7 +2208,6 @@ static inline struct reg_window *kernel_
>>
>> void die_if_kernel(char *str, struct pt_regs *regs)
>> {
>> -	static int die_counter;
>> 	extern void smp_report_regs(void);
>> 	int count = 0;
>> 	
>> diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
>> index e5403dc..93c4215 100644
>> --- a/arch/x86_64/kernel/traps.c
>> +++ b/arch/x86_64/kernel/traps.c
>> @@ -570,7 +570,6 @@ void __kprobes oops_end(unsigned long fl
>>
>> void __kprobes __die(const char * str, struct pt_regs * regs, long err)
>> {
>> -	static int die_counter;
>> 	printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter);
>> #ifdef CONFIG_PREEMPT
>> 	printk("PREEMPT ");
>> diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
>> index 693ab26..97cc4e2 100644
>> --- a/arch/xtensa/kernel/traps.c
>> +++ b/arch/xtensa/kernel/traps.c
>> @@ -465,7 +465,6 @@ DEFINE_SPINLOCK(die_lock);
>>
>> void die(const char * str, struct pt_regs * regs, long err)
>> {
>> -	static int die_counter;
>> 	int nl = 0;
>>
>> 	console_verbose();
>> diff --git a/include/linux/kernel.h b/include/linux/kernel.h
>> index b8f8252..54c4fc4 100644
>> --- a/include/linux/kernel.h
>> +++ b/include/linux/kernel.h
>> @@ -202,6 +202,7 @@ extern enum system_states {
>> #define TAINT_USER			(1<<6)
>>
>> extern void dump_stack(void);
>> +extern int die_counter;
>>
>> #ifdef DEBUG
>> /* If you are writing a driver, please use dev_dbg instead */
>> diff --git a/kernel/panic.c b/kernel/panic.c
>> index 623d182..e75eea4 100644
>> --- a/kernel/panic.c
>> +++ b/kernel/panic.c
>> @@ -150,23 +150,27 @@ EXPORT_SYMBOL(panic);
>>  *  'R' - User forced a module unload.
>>  *  'M' - Machine had a machine check experience.
>>  *  'B' - System has hit bad_page.
>> + *  'D' - An OOPS or BUG has happened.
>>  *  'U' - Userspace-defined naughtiness.
>>  *
>>  *	The string is overwritten by the next call to print_taint().
>>  */
>> +
>> +int die_counter;
>>  
>> const char *print_tainted(void)
>> {
>> 	static char buf[20];
>> -	if (tainted) {
>> -		snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c%c",
>> +	if (tainted || die_counter) {
>> +		snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c%c%c",
>> 			tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G',
>> 			tainted & TAINT_FORCED_MODULE ? 'F' : ' ',
>> 			tainted & TAINT_UNSAFE_SMP ? 'S' : ' ',
>> 			tainted & TAINT_FORCED_RMMOD ? 'R' : ' ',
>>  			tainted & TAINT_MACHINE_CHECK ? 'M' : ' ',
>> 			tainted & TAINT_BAD_PAGE ? 'B' : ' ',
>> -			tainted & TAINT_USER ? 'U' : ' ');
>> +			tainted & TAINT_USER ? 'U' : ' ',
>> +			die_counter ? 'D' : ' ');
>> 	}
>> 	else
>> 		snprintf(buf, sizeof(buf), "Not tainted");
>> -
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