[Devel] [RFC][PATCH 06/16] Define is_global_init()
sukadev at us.ibm.com
sukadev at us.ibm.com
Wed May 23 18:11:00 PDT 2007
Subject: Define is_global_init()
From: Serge E. Hallyn <serue at us.ibm.com>
is_init() is an ambiguous name for the pid==1 check. Split it into
is_global_init() and is_container_init().
A container init has it's tsk->pid == 1.
A global init also has it's tsk->pid == 1, and it's active pid namespace
is the init_pid_ns.
Changelog:
2.6.21-mm2-pidns2:
- [Sukadev Bhattiprolu] Changed is_container_init() calls in {powerpc,
ppc,avr32}/traps.c for the _exception() call to is_global_init().
This way, we kill only the container if the container's init has a
bug rather than force a kernel panic.
Signed-off-by: Serge E. Hallyn <serue at us.ibm.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev at us.ibm.com>
---
arch/alpha/mm/fault.c | 2 +-
arch/arm/mm/fault.c | 2 +-
arch/arm26/mm/fault.c | 2 +-
arch/avr32/kernel/traps.c | 2 +-
arch/avr32/mm/fault.c | 6 +++---
arch/i386/lib/usercopy.c | 2 +-
arch/i386/mm/fault.c | 2 +-
arch/ia64/mm/fault.c | 2 +-
arch/m32r/mm/fault.c | 2 +-
arch/m68k/mm/fault.c | 2 +-
arch/mips/mm/fault.c | 2 +-
arch/powerpc/kernel/traps.c | 2 +-
arch/powerpc/mm/fault.c | 2 +-
arch/powerpc/platforms/pseries/ras.c | 2 +-
arch/ppc/kernel/traps.c | 2 +-
arch/ppc/mm/fault.c | 2 +-
arch/s390/lib/uaccess_pt.c | 2 +-
arch/s390/mm/fault.c | 2 +-
arch/sh/mm/fault.c | 2 +-
arch/sh64/mm/fault.c | 6 +++---
arch/um/kernel/trap.c | 2 +-
arch/x86_64/mm/fault.c | 4 ++--
arch/xtensa/mm/fault.c | 2 +-
drivers/char/sysrq.c | 2 +-
include/linux/sched.h | 13 +++----------
kernel/capability.c | 3 ++-
kernel/exit.c | 2 +-
kernel/kexec.c | 2 +-
kernel/pid.c | 21 +++++++++++++++++++++
kernel/sysctl.c | 2 +-
mm/oom_kill.c | 4 ++--
security/commoncap.c | 2 +-
32 files changed, 61 insertions(+), 46 deletions(-)
Index: lx26-21-mm2/arch/alpha/mm/fault.c
===================================================================
--- lx26-21-mm2.orig/arch/alpha/mm/fault.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/alpha/mm/fault.c 2007-05-22 16:59:46.000000000 -0700
@@ -192,7 +192,7 @@ do_page_fault(unsigned long address, uns
/* We ran out of memory, or some other thing happened to us that
made us unable to handle the page fault gracefully. */
out_of_memory:
- if (is_init(current)) {
+ if (is_global_init(current)) {
yield();
down_read(&mm->mmap_sem);
goto survive;
Index: lx26-21-mm2/arch/arm/mm/fault.c
===================================================================
--- lx26-21-mm2.orig/arch/arm/mm/fault.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/arm/mm/fault.c 2007-05-22 16:59:46.000000000 -0700
@@ -197,7 +197,7 @@ survive:
return fault;
}
- if (!is_init(tsk))
+ if (!is_global_init(tsk))
goto out;
/*
Index: lx26-21-mm2/arch/arm26/mm/fault.c
===================================================================
--- lx26-21-mm2.orig/arch/arm26/mm/fault.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/arm26/mm/fault.c 2007-05-22 16:59:46.000000000 -0700
@@ -185,7 +185,7 @@ survive:
}
fault = -3; /* out of memory */
- if (!is_init(tsk))
+ if (!is_global_init(tsk))
goto out;
/*
Index: lx26-21-mm2/arch/i386/lib/usercopy.c
===================================================================
--- lx26-21-mm2.orig/arch/i386/lib/usercopy.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/i386/lib/usercopy.c 2007-05-22 16:59:46.000000000 -0700
@@ -748,7 +748,7 @@ survive:
retval = get_user_pages(current, current->mm,
(unsigned long )to, 1, 1, 0, &pg, NULL);
- if (retval == -ENOMEM && is_init(current)) {
+ if (retval == -ENOMEM && is_global_init(current)) {
up_read(¤t->mm->mmap_sem);
congestion_wait(WRITE, HZ/50);
goto survive;
Index: lx26-21-mm2/arch/i386/mm/fault.c
===================================================================
--- lx26-21-mm2.orig/arch/i386/mm/fault.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/i386/mm/fault.c 2007-05-22 16:59:46.000000000 -0700
@@ -576,7 +576,7 @@ no_context:
*/
out_of_memory:
up_read(&mm->mmap_sem);
- if (is_init(tsk)) {
+ if (is_global_init(tsk)) {
yield();
down_read(&mm->mmap_sem);
goto survive;
Index: lx26-21-mm2/arch/ia64/mm/fault.c
===================================================================
--- lx26-21-mm2.orig/arch/ia64/mm/fault.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/ia64/mm/fault.c 2007-05-22 16:59:46.000000000 -0700
@@ -279,7 +279,7 @@ ia64_do_page_fault (unsigned long addres
out_of_memory:
up_read(&mm->mmap_sem);
- if (is_init(current)) {
+ if (is_global_init(current)) {
yield();
down_read(&mm->mmap_sem);
goto survive;
Index: lx26-21-mm2/arch/m32r/mm/fault.c
===================================================================
--- lx26-21-mm2.orig/arch/m32r/mm/fault.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/m32r/mm/fault.c 2007-05-22 16:59:46.000000000 -0700
@@ -272,7 +272,7 @@ no_context:
*/
out_of_memory:
up_read(&mm->mmap_sem);
- if (is_init(tsk)) {
+ if (is_global_init(tsk)) {
yield();
down_read(&mm->mmap_sem);
goto survive;
Index: lx26-21-mm2/arch/m68k/mm/fault.c
===================================================================
--- lx26-21-mm2.orig/arch/m68k/mm/fault.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/m68k/mm/fault.c 2007-05-22 16:59:46.000000000 -0700
@@ -181,7 +181,7 @@ good_area:
*/
out_of_memory:
up_read(&mm->mmap_sem);
- if (is_init(current)) {
+ if (is_global_init(current)) {
yield();
down_read(&mm->mmap_sem);
goto survive;
Index: lx26-21-mm2/arch/mips/mm/fault.c
===================================================================
--- lx26-21-mm2.orig/arch/mips/mm/fault.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/mips/mm/fault.c 2007-05-22 16:59:46.000000000 -0700
@@ -174,7 +174,7 @@ no_context:
*/
out_of_memory:
up_read(&mm->mmap_sem);
- if (is_init(tsk)) {
+ if (is_global_init(tsk)) {
yield();
down_read(&mm->mmap_sem);
goto survive;
Index: lx26-21-mm2/arch/powerpc/kernel/traps.c
===================================================================
--- lx26-21-mm2.orig/arch/powerpc/kernel/traps.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/powerpc/kernel/traps.c 2007-05-22 16:59:46.000000000 -0700
@@ -190,7 +190,7 @@ void _exception(int signr, struct pt_reg
* generate the same exception over and over again and we get
* nowhere. Better to kill it and let the kernel panic.
*/
- if (is_init(current)) {
+ if (is_global_init(current)) {
__sighandler_t handler;
spin_lock_irq(¤t->sighand->siglock);
Index: lx26-21-mm2/arch/powerpc/mm/fault.c
===================================================================
--- lx26-21-mm2.orig/arch/powerpc/mm/fault.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/powerpc/mm/fault.c 2007-05-22 16:59:46.000000000 -0700
@@ -374,7 +374,7 @@ bad_area_nosemaphore:
*/
out_of_memory:
up_read(&mm->mmap_sem);
- if (is_init(current)) {
+ if (is_global_init(current)) {
yield();
down_read(&mm->mmap_sem);
goto survive;
Index: lx26-21-mm2/arch/powerpc/platforms/pseries/ras.c
===================================================================
--- lx26-21-mm2.orig/arch/powerpc/platforms/pseries/ras.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/powerpc/platforms/pseries/ras.c 2007-05-22 16:59:46.000000000 -0700
@@ -332,7 +332,7 @@ static int recover_mce(struct pt_regs *r
err->disposition == RTAS_DISP_NOT_RECOVERED &&
err->target == RTAS_TARGET_MEMORY &&
err->type == RTAS_TYPE_ECC_UNCORR &&
- !(current->pid == 0 || is_init(current))) {
+ !(current->pid == 0 || is_global_init(current))) {
/* Kill off a user process with an ECC error */
printk(KERN_ERR "MCE: uncorrectable ecc error for pid %d\n",
current->pid);
Index: lx26-21-mm2/arch/ppc/kernel/traps.c
===================================================================
--- lx26-21-mm2.orig/arch/ppc/kernel/traps.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/ppc/kernel/traps.c 2007-05-22 16:59:46.000000000 -0700
@@ -120,7 +120,7 @@ void _exception(int signr, struct pt_reg
* generate the same exception over and over again and we get
* nowhere. Better to kill it and let the kernel panic.
*/
- if (is_init(current)) {
+ if (is_global_init(current)) {
__sighandler_t handler;
spin_lock_irq(¤t->sighand->siglock);
Index: lx26-21-mm2/arch/ppc/mm/fault.c
===================================================================
--- lx26-21-mm2.orig/arch/ppc/mm/fault.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/ppc/mm/fault.c 2007-05-22 16:59:46.000000000 -0700
@@ -291,7 +291,7 @@ bad_area:
*/
out_of_memory:
up_read(&mm->mmap_sem);
- if (is_init(current)) {
+ if (is_global_init(current)) {
yield();
down_read(&mm->mmap_sem);
goto survive;
Index: lx26-21-mm2/arch/s390/lib/uaccess_pt.c
===================================================================
--- lx26-21-mm2.orig/arch/s390/lib/uaccess_pt.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/s390/lib/uaccess_pt.c 2007-05-22 16:59:46.000000000 -0700
@@ -65,7 +65,7 @@ out:
out_of_memory:
up_read(&mm->mmap_sem);
- if (is_init(current)) {
+ if (is_global_init(current)) {
yield();
down_read(&mm->mmap_sem);
goto survive;
Index: lx26-21-mm2/arch/s390/mm/fault.c
===================================================================
--- lx26-21-mm2.orig/arch/s390/mm/fault.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/s390/mm/fault.c 2007-05-22 16:59:46.000000000 -0700
@@ -211,7 +211,7 @@ static int do_out_of_memory(struct pt_re
struct mm_struct *mm = tsk->mm;
up_read(&mm->mmap_sem);
- if (is_init(tsk)) {
+ if (is_global_init(tsk)) {
yield();
down_read(&mm->mmap_sem);
return 1;
Index: lx26-21-mm2/arch/sh/mm/fault.c
===================================================================
--- lx26-21-mm2.orig/arch/sh/mm/fault.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/sh/mm/fault.c 2007-05-22 16:59:46.000000000 -0700
@@ -233,7 +233,7 @@ no_context:
*/
out_of_memory:
up_read(&mm->mmap_sem);
- if (is_init(current)) {
+ if (is_global_init(current)) {
yield();
down_read(&mm->mmap_sem);
goto survive;
Index: lx26-21-mm2/arch/sh64/mm/fault.c
===================================================================
--- lx26-21-mm2.orig/arch/sh64/mm/fault.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/sh64/mm/fault.c 2007-05-22 16:59:46.000000000 -0700
@@ -276,7 +276,7 @@ bad_area:
show_regs(regs);
#endif
}
- if (is_init(tsk)) {
+ if (is_global_init(tsk)) {
panic("INIT had user mode bad_area\n");
}
tsk->thread.address = address;
@@ -318,14 +318,14 @@ no_context:
* us unable to handle the page fault gracefully.
*/
out_of_memory:
- if (is_init(current)) {
+ if (is_global_init(current)) {
panic("INIT out of memory\n");
yield();
goto survive;
}
printk("fault:Out of memory\n");
up_read(&mm->mmap_sem);
- if (is_init(current)) {
+ if (is_global_init(current)) {
yield();
down_read(&mm->mmap_sem);
goto survive;
Index: lx26-21-mm2/arch/um/kernel/trap.c
===================================================================
--- lx26-21-mm2.orig/arch/um/kernel/trap.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/um/kernel/trap.c 2007-05-22 16:59:46.000000000 -0700
@@ -120,7 +120,7 @@ out_nosemaphore:
* us unable to handle the page fault gracefully.
*/
out_of_memory:
- if (is_init(current)) {
+ if (is_global_init(current)) {
up_read(&mm->mmap_sem);
yield();
down_read(&mm->mmap_sem);
Index: lx26-21-mm2/arch/x86_64/mm/fault.c
===================================================================
--- lx26-21-mm2.orig/arch/x86_64/mm/fault.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/x86_64/mm/fault.c 2007-05-22 16:59:46.000000000 -0700
@@ -223,7 +223,7 @@ static int is_errata93(struct pt_regs *r
int unhandled_signal(struct task_struct *tsk, int sig)
{
- if (is_init(tsk))
+ if (is_global_init(tsk))
return 1;
if (tsk->ptrace & PT_PTRACED)
return 0;
@@ -557,7 +557,7 @@ no_context:
*/
out_of_memory:
up_read(&mm->mmap_sem);
- if (is_init(current)) {
+ if (is_global_init(current)) {
yield();
goto again;
}
Index: lx26-21-mm2/arch/xtensa/mm/fault.c
===================================================================
--- lx26-21-mm2.orig/arch/xtensa/mm/fault.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/xtensa/mm/fault.c 2007-05-22 16:59:46.000000000 -0700
@@ -144,7 +144,7 @@ bad_area:
*/
out_of_memory:
up_read(&mm->mmap_sem);
- if (is_init(current)) {
+ if (is_global_init(current)) {
yield();
down_read(&mm->mmap_sem);
goto survive;
Index: lx26-21-mm2/drivers/char/sysrq.c
===================================================================
--- lx26-21-mm2.orig/drivers/char/sysrq.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/drivers/char/sysrq.c 2007-05-22 16:59:46.000000000 -0700
@@ -250,7 +250,7 @@ static void send_sig_all(int sig)
struct task_struct *p;
for_each_process(p) {
- if (p->mm && !is_init(p))
+ if (p->mm && !is_global_init(p))
/* Not swapper, init nor kernel thread */
force_sig(sig, p);
}
Index: lx26-21-mm2/include/linux/sched.h
===================================================================
--- lx26-21-mm2.orig/include/linux/sched.h 2007-05-22 16:59:44.000000000 -0700
+++ lx26-21-mm2/include/linux/sched.h 2007-05-22 16:59:46.000000000 -0700
@@ -1171,16 +1171,9 @@ static inline int pid_alive(struct task_
return p->pids[PIDTYPE_PID].pid != NULL;
}
-/**
- * is_init - check if a task structure is init
- * @tsk: Task structure to be checked.
- *
- * Check if a task structure is the first user space task the kernel created.
- */
-static inline int is_init(struct task_struct *tsk)
-{
- return tsk->pid == 1;
-}
+struct pid_namespace;
+extern int is_global_init(struct task_struct *tsk);
+extern int is_container_init(struct task_struct *tsk);
extern struct pid *cad_pid;
Index: lx26-21-mm2/kernel/capability.c
===================================================================
--- lx26-21-mm2.orig/kernel/capability.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/kernel/capability.c 2007-05-22 16:59:46.000000000 -0700
@@ -12,6 +12,7 @@
#include <linux/module.h>
#include <linux/security.h>
#include <linux/syscalls.h>
+#include <linux/pid_namespace.h>
#include <asm/uaccess.h>
unsigned securebits = SECUREBITS_DEFAULT; /* systemwide security settings */
@@ -135,7 +136,7 @@ static inline int cap_set_all(kernel_cap
int found = 0;
do_each_thread(g, target) {
- if (target == current || is_init(target))
+ if (target == current || is_container_init(target))
continue;
found = 1;
if (security_capset_check(target, effective, inheritable,
Index: lx26-21-mm2/kernel/exit.c
===================================================================
--- lx26-21-mm2.orig/kernel/exit.c 2007-05-22 16:59:42.000000000 -0700
+++ lx26-21-mm2/kernel/exit.c 2007-05-22 16:59:46.000000000 -0700
@@ -230,7 +230,7 @@ static int will_become_orphaned_pgrp(str
do_each_pid_task(pgrp, PIDTYPE_PGID, p) {
if (p == ignored_task
|| p->exit_state
- || is_init(p->real_parent))
+ || is_global_init(p->real_parent))
continue;
if (task_pgrp(p->real_parent) != pgrp &&
task_session(p->real_parent) == task_session(p)) {
Index: lx26-21-mm2/kernel/kexec.c
===================================================================
--- lx26-21-mm2.orig/kernel/kexec.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/kernel/kexec.c 2007-05-22 16:59:46.000000000 -0700
@@ -42,7 +42,7 @@ struct resource crashk_res = {
int kexec_should_crash(struct task_struct *p)
{
- if (in_interrupt() || !p->pid || is_init(p) || panic_on_oops)
+ if (in_interrupt() || !p->pid || is_global_init(p) || panic_on_oops)
return 1;
return 0;
}
Index: lx26-21-mm2/kernel/sysctl.c
===================================================================
--- lx26-21-mm2.orig/kernel/sysctl.c 2007-05-22 16:59:41.000000000 -0700
+++ lx26-21-mm2/kernel/sysctl.c 2007-05-22 16:59:46.000000000 -0700
@@ -1730,7 +1730,7 @@ int proc_dointvec_bset(ctl_table *table,
return -EPERM;
}
- op = is_init(current) ? OP_SET : OP_AND;
+ op = is_global_init(current) ? OP_SET : OP_AND;
return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
do_proc_dointvec_bset_conv,&op);
}
Index: lx26-21-mm2/mm/oom_kill.c
===================================================================
--- lx26-21-mm2.orig/mm/oom_kill.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/mm/oom_kill.c 2007-05-22 16:59:46.000000000 -0700
@@ -222,7 +222,7 @@ static struct task_struct *select_bad_pr
if (!p->mm)
continue;
/* skip the init task */
- if (is_init(p))
+ if (is_global_init(p))
continue;
/*
@@ -275,7 +275,7 @@ static struct task_struct *select_bad_pr
*/
static void __oom_kill_task(struct task_struct *p, int verbose)
{
- if (is_init(p)) {
+ if (is_global_init(p)) {
WARN_ON(1);
printk(KERN_WARNING "tried to kill init!\n");
return;
Index: lx26-21-mm2/security/commoncap.c
===================================================================
--- lx26-21-mm2.orig/security/commoncap.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/security/commoncap.c 2007-05-22 16:59:46.000000000 -0700
@@ -306,7 +306,7 @@ void cap_bprm_apply_creds (struct linux_
/* For init, we want to retain the capabilities set
* in the init_task struct. Thus we skip the usual
* capability rules */
- if (!is_init(current)) {
+ if (!is_global_init(current)) {
current->cap_permitted = new_permitted;
current->cap_effective =
cap_intersect (new_permitted, bprm->cap_effective);
Index: lx26-21-mm2/arch/avr32/kernel/traps.c
===================================================================
--- lx26-21-mm2.orig/arch/avr32/kernel/traps.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/avr32/kernel/traps.c 2007-05-22 16:59:46.000000000 -0700
@@ -88,7 +88,7 @@ void _exception(long signr, struct pt_re
* generate the same exception over and over again and we get
* nowhere. Better to kill it and let the kernel panic.
*/
- if (is_init(current)) {
+ if (is_global_init(current)) {
__sighandler_t handler;
spin_lock_irq(¤t->sighand->siglock);
Index: lx26-21-mm2/arch/avr32/mm/fault.c
===================================================================
--- lx26-21-mm2.orig/arch/avr32/mm/fault.c 2007-05-22 16:58:38.000000000 -0700
+++ lx26-21-mm2/arch/avr32/mm/fault.c 2007-05-22 16:59:46.000000000 -0700
@@ -173,7 +173,7 @@ bad_area:
if (exception_trace)
printk("%s%s[%d]: segfault at %08lx pc %08lx "
"sp %08lx ecr %lu\n",
- is_init(tsk) ? KERN_EMERG : KERN_INFO,
+ is_global_init(tsk) ? KERN_EMERG : KERN_INFO,
tsk->comm, tsk->pid, address, regs->pc,
regs->sp, ecr);
_exception(SIGSEGV, regs, code, address);
@@ -222,7 +222,7 @@ no_context:
*/
out_of_memory:
up_read(&mm->mmap_sem);
- if (is_init(current)) {
+ if (is_global_init(current)) {
yield();
down_read(&mm->mmap_sem);
goto survive;
@@ -244,7 +244,7 @@ do_sigbus:
if (exception_trace)
printk("%s%s[%d]: bus error at %08lx pc %08lx "
"sp %08lx ecr %lu\n",
- is_init(tsk) ? KERN_EMERG : KERN_INFO,
+ is_global_init(tsk) ? KERN_EMERG : KERN_INFO,
tsk->comm, tsk->pid, address, regs->pc,
regs->sp, ecr);
Index: lx26-21-mm2/kernel/pid.c
===================================================================
--- lx26-21-mm2.orig/kernel/pid.c 2007-05-22 16:59:34.000000000 -0700
+++ lx26-21-mm2/kernel/pid.c 2007-05-22 16:59:46.000000000 -0700
@@ -71,6 +71,27 @@ struct pid_namespace init_pid_ns = {
.child_reaper = &init_task
};
+
+/**
+ * is_global_init - check if a task structure is init
+ * @tsk: Task structure to be checked.
+ *
+ * Check if a task structure is the first user space task the kernel created.
+ */
+int is_global_init(struct task_struct *tsk)
+{
+ return (task_active_pid_ns(tsk) == &init_pid_ns && tsk->pid == 1);
+}
+
+/*
+ * is_container_init:
+ * check whether in the task is init in it's own pid namespace.
+ */
+int is_container_init(struct task_struct *tsk)
+{
+ return tsk->pid == 1;
+}
+
/*
* Note: disable interrupts while the pidmap_lock is held as an
* interrupt might come in and do read_lock(&tasklist_lock).
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