During VM oom condition, kill all threads in process group

We have had complaints where a threaded application is left in a bad state
after one of it's threads is killed when we hit a VM: out_of_memory
condition.

Killing just one of the process threads can leave the application in a bad
state, whereas killing the entire process group would allow for the
application to restart, or be otherwise handled, and makes it very obvious
that something has gone wrong.

This change allows the entire process group to be taken down, rather
than just the one thread.

Signed-off-by: Will Schmidt <will_schmidt@vnet.ibm.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ian Molton <spyro@f2s.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Andi Kleen <ak@suse.de>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Matthew Wilcox <willy@debian.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
Cc: Richard Curnow <rc@rc0.org.uk>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

18 files changed, 18 insertions, 18 deletions

diff --git a/arch/alpha/mm/fault.c b/arch/alpha/mm/fault.c
index a0e18da594d9..25154df3055a 100644
--- a/arch/alpha/mm/fault.c
+++ b/arch/alpha/mm/fault.c
@@ -197,7 +197,7 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
 	       current->comm, current->pid);
 	if (!user_mode(regs))
 		goto no_context;
-	do_exit(SIGKILL);
+	do_group_exit(SIGKILL);
 
  do_sigbus:
 	/* Send a sigbus, regardless of whether we were in kernel
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index 846cce48e2b7..59ed1d05b71b 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -266,7 +266,7 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
 		 * the page fault gracefully.
 		 */
 		printk("VM: killing process %s\n", tsk->comm);
-		do_exit(SIGKILL);
+		do_group_exit(SIGKILL);
 		return 0;
 	}
 	if (fault & VM_FAULT_SIGBUS) {
diff --git a/arch/avr32/mm/fault.c b/arch/avr32/mm/fault.c
index ae2d2c593b2b..11472f8701bd 100644
--- a/arch/avr32/mm/fault.c
+++ b/arch/avr32/mm/fault.c
@@ -216,7 +216,7 @@ out_of_memory:
 	}
 	printk("VM: Killing process %s\n", tsk->comm);
 	if (user_mode(regs))
-		do_exit(SIGKILL);
+		do_group_exit(SIGKILL);
 	goto no_context;
 
 do_sigbus:
diff --git a/arch/cris/mm/fault.c b/arch/cris/mm/fault.c
index 8672ab7d7978..8aab81430695 100644
--- a/arch/cris/mm/fault.c
+++ b/arch/cris/mm/fault.c
@@ -360,7 +360,7 @@ do_page_fault(unsigned long address, struct pt_regs *regs,
 	up_read(&mm->mmap_sem);
 	printk("VM: killing process %s\n", tsk->comm);
 	if (user_mode(regs))
-		do_exit(SIGKILL);
+		do_group_exit(SIGKILL);
 	goto no_context;
 
  do_sigbus:
diff --git a/arch/frv/mm/fault.c b/arch/frv/mm/fault.c
index 6798fa0257b1..05093d41d98e 100644
--- a/arch/frv/mm/fault.c
+++ b/arch/frv/mm/fault.c
@@ -259,7 +259,7 @@ asmlinkage void do_page_fault(int datammu, unsigned long esr0, unsigned long ear
 	up_read(&mm->mmap_sem);
 	printk("VM: killing process %s\n", current->comm);
 	if (user_mode(__frame))
-		do_exit(SIGKILL);
+		do_group_exit(SIGKILL);
 	goto no_context;
 
  do_sigbus:
diff --git a/arch/ia64/mm/fault.c b/arch/ia64/mm/fault.c
index 9150ffaff9e8..32f26253c4e8 100644
--- a/arch/ia64/mm/fault.c
+++ b/arch/ia64/mm/fault.c
@@ -281,6 +281,6 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
 	}
 	printk(KERN_CRIT "VM: killing process %s\n", current->comm);
 	if (user_mode(regs))
-		do_exit(SIGKILL);
+		do_group_exit(SIGKILL);
 	goto no_context;
 }
diff --git a/arch/m32r/mm/fault.c b/arch/m32r/mm/fault.c
index 676a1c443d28..70a766aad3e0 100644
--- a/arch/m32r/mm/fault.c
+++ b/arch/m32r/mm/fault.c
@@ -278,7 +278,7 @@ out_of_memory:
 	}
 	printk("VM: killing process %s\n", tsk->comm);
 	if (error_code & ACE_USERMODE)
-		do_exit(SIGKILL);
+		do_group_exit(SIGKILL);
 	goto no_context;
 
 do_sigbus:
diff --git a/arch/m68k/mm/fault.c b/arch/m68k/mm/fault.c
index 578b48f47b9e..eaa618681159 100644
--- a/arch/m68k/mm/fault.c
+++ b/arch/m68k/mm/fault.c
@@ -188,7 +188,7 @@ out_of_memory:
 
 	printk("VM: killing process %s\n", current->comm);
 	if (user_mode(regs))
-		do_exit(SIGKILL);
+		do_group_exit(SIGKILL);
 
 no_context:
 	current->thread.signo = SIGBUS;
diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c
index 521771b373de..5699c7713e2f 100644
--- a/arch/mips/mm/fault.c
+++ b/arch/mips/mm/fault.c
@@ -180,7 +180,7 @@ out_of_memory:
 	}
 	printk("VM: killing process %s\n", tsk->comm);
 	if (user_mode(regs))
-		do_exit(SIGKILL);
+		do_group_exit(SIGKILL);
 	goto no_context;
 
 do_sigbus:
diff --git a/arch/parisc/mm/fault.c b/arch/parisc/mm/fault.c
index 7899ab87785a..1c091b415cd9 100644
--- a/arch/parisc/mm/fault.c
+++ b/arch/parisc/mm/fault.c
@@ -263,6 +263,6 @@ no_context:
 	up_read(&mm->mmap_sem);
 	printk(KERN_CRIT "VM: killing process %s\n", current->comm);
 	if (user_mode(regs))
-		do_exit(SIGKILL);
+		do_group_exit(SIGKILL);
 	goto no_context;
 }
diff --git a/arch/ppc/mm/fault.c b/arch/ppc/mm/fault.c
index b98244e277fb..94913ddcf76e 100644
--- a/arch/ppc/mm/fault.c
+++ b/arch/ppc/mm/fault.c
@@ -297,7 +297,7 @@ out_of_memory:
 	}
 	printk("VM: killing process %s\n", current->comm);
 	if (user_mode(regs))
-		do_exit(SIGKILL);
+		do_group_exit(SIGKILL);
 	return SIGKILL;
 
 do_sigbus:
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 4c1ac341ec80..14c241ccdd4d 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -218,7 +218,7 @@ static int do_out_of_memory(struct pt_regs *regs, unsigned long error_code,
 	}
 	printk("VM: killing process %s\n", tsk->comm);
 	if (regs->psw.mask & PSW_MASK_PSTATE)
-		do_exit(SIGKILL);
+		do_group_exit(SIGKILL);
 	do_no_context(regs, error_code, address);
 	return 0;
 }
diff --git a/arch/sh/mm/fault.c b/arch/sh/mm/fault.c
index 04a39aa7f1f9..4729668ce5bf 100644
--- a/arch/sh/mm/fault.c
+++ b/arch/sh/mm/fault.c
@@ -214,7 +214,7 @@ out_of_memory:
 	}
 	printk("VM: killing process %s\n", tsk->comm);
 	if (user_mode(regs))
-		do_exit(SIGKILL);
+		do_group_exit(SIGKILL);
 	goto no_context;
 
 do_sigbus:
diff --git a/arch/sh64/mm/fault.c b/arch/sh64/mm/fault.c
index 0d069d82141f..dd81c669c79b 100644
--- a/arch/sh64/mm/fault.c
+++ b/arch/sh64/mm/fault.c
@@ -334,7 +334,7 @@ out_of_memory:
 	}
 	printk("VM: killing process %s\n", tsk->comm);
 	if (user_mode(regs))
-		do_exit(SIGKILL);
+		do_group_exit(SIGKILL);
 	goto no_context;
 
 do_sigbus:
diff --git a/arch/sparc/mm/fault.c b/arch/sparc/mm/fault.c
index 50747fe44356..e4d9c8e19df5 100644
--- a/arch/sparc/mm/fault.c
+++ b/arch/sparc/mm/fault.c
@@ -369,7 +369,7 @@ out_of_memory:
 	up_read(&mm->mmap_sem);
 	printk("VM: killing process %s\n", tsk->comm);
 	if (from_user)
-		do_exit(SIGKILL);
+		do_group_exit(SIGKILL);
 	goto no_context;
 
 do_sigbus:
diff --git a/arch/sparc64/mm/fault.c b/arch/sparc64/mm/fault.c
index 9f7740eee8d2..e2027f27c0fe 100644
--- a/arch/sparc64/mm/fault.c
+++ b/arch/sparc64/mm/fault.c
@@ -463,7 +463,7 @@ out_of_memory:
 	up_read(&mm->mmap_sem);
 	printk("VM: killing process %s\n", current->comm);
 	if (!(regs->tstate & TSTATE_PRIV))
-		do_exit(SIGKILL);
+		do_group_exit(SIGKILL);
 	goto handle_kernel_fault;
 
 intr_or_no_mm:
diff --git a/arch/x86/mm/fault_32.c b/arch/x86/mm/fault_32.c
index be72c2a5b03b..c686ae20fd6b 100644
--- a/arch/x86/mm/fault_32.c
+++ b/arch/x86/mm/fault_32.c
@@ -593,7 +593,7 @@ out_of_memory:
 	}
 	printk("VM: killing process %s\n", tsk->comm);
 	if (error_code & 4)
-		do_exit(SIGKILL);
+		do_group_exit(SIGKILL);
 	goto no_context;
 
 do_sigbus:
diff --git a/arch/xtensa/mm/fault.c b/arch/xtensa/mm/fault.c
index 45d28f217c03..2f842859948f 100644
--- a/arch/xtensa/mm/fault.c
+++ b/arch/xtensa/mm/fault.c
@@ -152,7 +152,7 @@ out_of_memory:
 	}
 	printk("VM: killing process %s\n", current->comm);
 	if (user_mode(regs))
-		do_exit(SIGKILL);
+		do_group_exit(SIGKILL);
 	bad_page_fault(regs, address, SIGKILL);
 	return;