Report that kernel is tainted if there were an OOPS before (v2)

PATCH In review Pavel Emelianov 3 participants 3 messages Apr 17, 2007 – Jun 1, 2007

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Documentation Arm (32-bit) PowerPC MIPS +5 more subsystems

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Pavel Emelianov

author

2007-04-17 08:54 UTC #0 lore raw

PATCH 1/1 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 <[email protected]>

Signed-off-by Kirill Korotaev <[email protected]>

Cc Randy Dunlap <[email protected]>

---

Documentation/oops-tracing.txt +4 -0

index ea55ea8..dddbfe0 100644
@@ -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

arch/arm/kernel/traps.c +0 -1

index b3ffba1..764526c 100644
@@ -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();

arch/avr32/kernel/traps.c +0 -2

index c8b7153..0829ebc 100644
@@ -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);

arch/i386/kernel/traps.c +0 -1

index 35d1c38..8531901 100644
@@ -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();

arch/ia64/kernel/traps.c +0 -1

index 5bfb8be..7a1e8d8 100644
@@ -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) {

arch/mips/kernel/traps.c +0 -1

index 27c53f1..2c65120 100644
@@ -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 */

arch/powerpc/kernel/traps.c +0 -1

index bf6445a..13bc4c7 100644
@@ -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))

arch/ppc/kernel/traps.c +0 -1

index 810f7aa..3a058fb 100644
@@ -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);

arch/s390/kernel/traps.c +0 -2

index 90ca82b..659f41c 100644
@@ -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);

arch/sh/kernel/traps.c +0 -2

index e9f168f..38ae9de 100644
@@ -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);

arch/sparc/kernel/traps.c +0 -1

index dc9ffea..b9b4ddd 100644
@@ -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. */

arch/sparc64/kernel/traps.c +0 -1

index dc652f2..556189b 100644
@@ -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;

arch/x86_64/kernel/traps.c +0 -1

index e5403dc..93c4215 100644
@@ -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 ");

arch/xtensa/kernel/traps.c +0 -1

index 693ab26..97cc4e2 100644
@@ -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();

include/linux/kernel.h +1 -0

index b8f8252..54c4fc4 100644
@@ -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 */

kernel/panic.c +7 -3

index 623d182..e75eea4 100644
@@ -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");

Jan Engelhardt

2007-05-31 19:55 UTC #1 lore raw

This seems to have died and remain unmerged as of yet... resubmit?

Quoted 249 lines · Pavel Emelianov

Date: Tue, 17 Apr 2007 12:58:47 +0400
From: Pavel Emelianov <[email protected]>
To: Andrew Morton <[email protected]>,
Linux Kernel Mailing List <[email protected]>, [email protected]
Cc: [email protected], [email protected]
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 <[email protected]>

Signed-off-by Kirill Korotaev <[email protected]>

Cc Randy Dunlap <[email protected]>

---

Documentation/oops-tracing.txt +4 -0

index ea55ea8..dddbfe0 100644
@@ -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

arch/arm/kernel/traps.c +0 -1

index b3ffba1..764526c 100644
@@ -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();

arch/avr32/kernel/traps.c +0 -2

index c8b7153..0829ebc 100644
@@ -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);

arch/i386/kernel/traps.c +0 -1

index 35d1c38..8531901 100644
@@ -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();

arch/ia64/kernel/traps.c +0 -1

index 5bfb8be..7a1e8d8 100644
@@ -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) {

arch/mips/kernel/traps.c +0 -1

index 27c53f1..2c65120 100644
@@ -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 */

arch/powerpc/kernel/traps.c +0 -1

index bf6445a..13bc4c7 100644
@@ -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))

arch/ppc/kernel/traps.c +0 -1

index 810f7aa..3a058fb 100644
@@ -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);

arch/s390/kernel/traps.c +0 -2

index 90ca82b..659f41c 100644
@@ -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);

arch/sh/kernel/traps.c +0 -2

index e9f168f..38ae9de 100644
@@ -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);

arch/sparc/kernel/traps.c +0 -1

index dc9ffea..b9b4ddd 100644
@@ -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. */

arch/sparc64/kernel/traps.c +0 -1

index dc652f2..556189b 100644
@@ -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;

arch/x86_64/kernel/traps.c +0 -1

index e5403dc..93c4215 100644
@@ -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 ");

arch/xtensa/kernel/traps.c +0 -1

index 693ab26..97cc4e2 100644
@@ -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();

include/linux/kernel.h +1 -0

index b8f8252..54c4fc4 100644
@@ -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 */

kernel/panic.c +7 -4

index 623d182..e75eea4 100644
@@ -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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Pavel Emelianov

2007-06-01 07:33 UTC #2 lore raw

Quoted 1 line · Jan Engelhardt

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

Quoted 258 lines · Pavel Emelianov

Quoted 245 lines

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 <[email protected]>

Signed-off-by Kirill Korotaev <[email protected]>

Cc Randy Dunlap <[email protected]>

---

Documentation/oops-tracing.txt +4 -0

index ea55ea8..dddbfe0 100644
@@ -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

arch/arm/kernel/traps.c +0 -1

index b3ffba1..764526c 100644
@@ -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();

arch/avr32/kernel/traps.c +0 -2

index c8b7153..0829ebc 100644
@@ -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);

arch/i386/kernel/traps.c +0 -1

index 35d1c38..8531901 100644
@@ -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();

arch/ia64/kernel/traps.c +0 -1

index 5bfb8be..7a1e8d8 100644
@@ -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) {

arch/mips/kernel/traps.c +0 -1

index 27c53f1..2c65120 100644
@@ -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 */

arch/powerpc/kernel/traps.c +0 -1

index bf6445a..13bc4c7 100644
@@ -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))

arch/ppc/kernel/traps.c +0 -1

index 810f7aa..3a058fb 100644
@@ -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);

arch/s390/kernel/traps.c +0 -2

index 90ca82b..659f41c 100644
@@ -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);

arch/sh/kernel/traps.c +0 -2

index e9f168f..38ae9de 100644
@@ -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);

arch/sparc/kernel/traps.c +0 -1

index dc9ffea..b9b4ddd 100644
@@ -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. */

arch/sparc64/kernel/traps.c +0 -1

index dc652f2..556189b 100644
@@ -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;

arch/x86_64/kernel/traps.c +0 -1

index e5403dc..93c4215 100644
@@ -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 ");

arch/xtensa/kernel/traps.c +0 -1

index 693ab26..97cc4e2 100644
@@ -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();

include/linux/kernel.h +1 -0

index b8f8252..54c4fc4 100644
@@ -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 */

kernel/panic.c +7 -4

index 623d182..e75eea4 100644
@@ -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");
-

Quoted 5 lines

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