Oleg Nesterov 1cc684ab75 kmod: make __request_module() killable ... As Tetsuo Handa pointed out, request_module() can stress the system while the oom-killed caller sleeps in TASK_UNINTERRUPTIBLE. The task T uses "almost all" memory, then it does something which triggers request_module(). Say, it can simply call sys_socket(). This in turn needs more memory and leads to OOM. oom-killer correctly chooses T and kills it, but this can't help because it sleeps in TASK_UNINTERRUPTIBLE and after that oom-killer becomes "disabled" by the TIF_MEMDIE task T. Make __request_module() killable. The only necessary change is that call_modprobe() should kmalloc argv and module_name, they can't live in the stack if we use UMH_KILLABLE. This memory is freed via call_usermodehelper_freeinfo()->cleanup. Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Tejun Heo <tj@kernel.org> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2012-03-23 16:58:42 -07:00
..
debug	Fixes:	2012-03-23 09:29:44 -07:00
events	Merge branch 'for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2012-03-20 18:11:21 -07:00
gcov
irq	Generialize powerpc's irq_host as irq_domain	2012-03-21 10:27:19 -07:00
power	Power management updates for 3.4	2012-03-21 10:15:51 -07:00
sched	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2012-03-21 13:25:04 -07:00
time	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2012-03-22 20:20:18 -07:00
trace	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-03-21 13:36:41 -07:00
.gitignore
acct.c
async.c
audit_tree.c
audit_watch.c
audit.c	constify path argument of audit_log_d_path()	2012-03-20 21:29:40 -04:00
audit.h
auditfilter.c
auditsc.c
backtracetest.c
bounds.c
capability.c
cgroup_freezer.c
cgroup.c	Merge branch 'akpm' (Andrew's patch-bomb)	2012-03-22 09:04:48 -07:00
compat.c
configs.c
cpu_pm.c
cpu.c
cpuset.c	cpuset: mm: reduce large amounts of memory barrier related damage v3	2012-03-21 17:54:59 -07:00
crash_dump.c
cred.c	security: trim security.h	2012-02-14 10:45:42 +11:00
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	kernel/exit.c: if init dies, log a signal which killed it, if any	2012-03-23 16:58:32 -07:00
extable.c
fork.c	prctl: add PR_{SET,GET}_CHILD_SUBREAPER to allow simple process supervision	2012-03-23 16:58:32 -07:00
freezer.c	PM / Freezer: Remove references to TIF_FREEZE in comments	2012-03-04 23:08:54 +01:00
futex_compat.c
futex.c	Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-03-19 17:11:15 -07:00
groups.c
hrtimer.c
hung_task.c	hung_task: fix the broken rcu_lock_break() logic	2012-03-05 15:49:42 -08:00
irq_work.c
itimer.c
jump_label.c	static keys: Inline the static_key_enabled() function	2012-02-28 20:01:08 +01:00
kallsyms.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kexec.c
kfifo.c
kmod.c	kmod: make __request_module() killable	2012-03-23 16:58:42 -07:00
kprobes.c	kprobes: return proper error code from register_kprobe()	2012-03-05 15:49:42 -08:00
ksysfs.c
kthread.c
latencytop.c
lockdep_internals.h
lockdep_proc.c
lockdep_states.h
lockdep.c	lockdep: Add CPU-idle/offline warning to lockdep-RCU splat	2012-02-21 09:06:06 -08:00
Makefile
module.c
mutex-debug.c
mutex-debug.h
mutex.c	sched/rt: Use schedule_preempt_disabled()	2012-03-01 10:28:03 +01:00
mutex.h
notifier.c
nsproxy.c
padata.c	padata: Fix race on sequence number wrap	2012-03-14 17:25:56 +08:00
panic.c
params.c	module: make module param bint handle nul value	2012-02-14 11:02:15 +10:30
pid_namespace.c	signal: zap_pid_ns_processes: s/SEND_SIG_NOINFO/SEND_SIG_FORCED/	2012-03-23 16:58:41 -07:00
pid.c	vfs: fix panic in __d_lookup() with high dentry hashtable counts	2012-02-13 20:45:38 -05:00
posix-cpu-timers.c
posix-timers.c
printk.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-03-20 10:31:44 -07:00
profile.c
ptrace.c	ptrace: remove PTRACE_SEIZE_DEVEL bit	2012-03-23 16:58:41 -07:00
range.c
rcu.h	rcu: Allow nesting of rcu_idle_enter() and rcu_idle_exit()	2012-02-21 09:06:12 -08:00
rcupdate.c	rcu: Check for illegal use of RCU from offlined CPUs	2012-02-21 09:06:03 -08:00
rcutiny_plugin.h	rcu: Simplify unboosting checks	2012-02-21 09:03:43 -08:00
rcutiny.c	rcu: Add RCU_NONIDLE() for idle-loop RCU read-side critical sections	2012-02-21 09:06:13 -08:00
rcutorture.c	PTR_ERR should be called before its argument is cleared.	2012-02-21 09:06:10 -08:00
rcutree_plugin.h	rcu: Hold off RCU_FAST_NO_HZ after timer posted	2012-02-21 09:42:30 -08:00
rcutree_trace.c	rcu: Rework detection of use of RCU by offline CPUs	2012-02-21 09:06:07 -08:00
rcutree.c	rcu: Stop spurious warnings from synchronize_sched_expedited	2012-02-21 15:33:34 -08:00
rcutree.h	rcu: Rework detection of use of RCU by offline CPUs	2012-02-21 09:06:07 -08:00
relay.c	relay: prevent integer overflow in relay_open()	2012-02-10 09:04:49 +01:00
res_counter.c
resource.c
rtmutex_common.h
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c
rtmutex.h
rwsem.c
seccomp.c
semaphore.c
signal.c	signal: cosmetic, s/from_ancestor_ns/force/ in prepare_signal() paths	2012-03-23 16:58:41 -07:00
smp.c
softirq.c	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-03-20 10:32:09 -07:00
spinlock.c
srcu.c	rcu: Call out dangers of expedited RCU primitives	2012-02-21 09:06:08 -08:00
stacktrace.c
stop_machine.c
sys_ni.c
sys.c	prctl: add PR_{SET,GET}_CHILD_SUBREAPER to allow simple process supervision	2012-03-23 16:58:32 -07:00
sysctl_binary.c
sysctl_check.c
sysctl.c	security: trim security.h	2012-02-14 10:45:42 +11:00
taskstats.c
test_kprobes.c
time.c
timeconst.pl
timer.c
tracepoint.c	static keys: Introduce 'struct static_key', static_key_true()/false() and static_key_slow_[inc|dec]()	2012-02-24 10:05:59 +01:00
tsacct.c
uid16.c
up.c
user_namespace.c
user-return-notifier.c
user.c
utsname_sysctl.c
utsname.c
wait.c
watchdog.c	kernel/watchdog.c: add comment to watchdog() exit path	2012-03-23 16:58:32 -07:00
workqueue_sched.h
workqueue.c	Merge branch 'for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	2012-03-20 18:13:22 -07:00