Mike Galbraith bb2bc55a69 sched: Fix crash if cpuset_cpumask_can_shrink() is passed an empty cpumask ... While creating an exclusive cpuset, we passed cpuset_cpumask_can_shrink() an empty cpumask (cur), and dl_bw_of(cpumask_any(cur)) made boom with it: CPU: 0 PID: 6942 Comm: shield.sh Not tainted 3.19.0-master #19 Hardware name: MEDIONPC MS-7502/MS-7502, BIOS 6.00 PG 12/26/2007 task: ffff880224552450 ti: ffff8800caab8000 task.ti: ffff8800caab8000 RIP: 0010:[<ffffffff81073846>] [<ffffffff81073846>] cpuset_cpumask_can_shrink+0x56/0xb0 [...] Call Trace: [<ffffffff810cb82a>] validate_change+0x18a/0x200 [<ffffffff810cc877>] cpuset_write_resmask+0x3b7/0x720 [<ffffffff810c4d58>] cgroup_file_write+0x38/0x100 [<ffffffff811d953a>] kernfs_fop_write+0x12a/0x180 [<ffffffff8116e1a3>] vfs_write+0xb3/0x1d0 [<ffffffff8116ed06>] SyS_write+0x46/0xb0 [<ffffffff8159ced6>] system_call_fastpath+0x16/0x1b Signed-off-by: Mike Galbraith <umgwanakikbuti@gmail.com> Acked-by: Zefan Li <lizefan@huawei.com> Fixes: f82f80426f ("sched/deadline: Ensure that updates to exclusive cpusets don't break AC") Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1422417235.5716.5.camel@marge.simpson.net Signed-off-by: Ingo Molnar <mingo@kernel.org>		2015-01-28 15:28:15 +01:00
..
bpf	module: remove mod arg from module_free, rename module_memfree().	2015-01-20 11:38:33 +10:30
configs
debug	Surprising number of fixes this merge window :(	2015-01-23 06:40:36 +12:00
events	perf: Move task_pt_regs sampling into arch code	2015-01-09 11:12:28 +01:00
gcov	gcov: enable GCOV_PROFILE_ALL from ARCH Kconfigs	2014-12-13 12:42:51 -08:00
irq	genirq: Prevent proc race against freeing of irq descriptors	2014-12-13 13:33:07 +01:00
locking	mutex: Always clear owner field upon mutex_unlock()	2015-01-09 11:20:39 +01:00
power	PM: Eliminate CONFIG_PM_RUNTIME	2014-12-19 22:55:06 +01:00
printk	This code is a fork from the trace-3.19 pull as it needed the trace_seq	2014-12-13 14:04:41 -08:00
rcu
sched	sched: Fix crash if cpuset_cpumask_can_shrink() is passed an empty cpumask	2015-01-28 15:28:15 +01:00
time	Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-01-25 17:47:34 -08:00
trace	This holds a few fixes to the ftrace infrastructure as well as	2015-01-17 07:55:52 +13:00
.gitignore
acct.c
async.c
audit.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2014-12-30 10:45:47 -08:00
audit.h
audit_tree.c	fsnotify: unify inode and mount marks handling	2014-12-13 12:42:53 -08:00
audit_watch.c
auditfilter.c	Merge branch 'upstream' of git://git.infradead.org/users/pcmoore/audit	2014-12-23 18:13:16 -08:00
auditsc.c	Merge branch 'upstream' of git://git.infradead.org/users/pcmoore/audit	2014-12-31 14:52:18 -08:00
backtracetest.c
bounds.c
capability.c
cgroup.c	cgroup: prevent mount hang due to memory controller lifetime	2015-01-22 10:26:43 -05:00
cgroup_freezer.c
compat.c
configs.c
context_tracking.c
cpu.c
cpu_pm.c
cpuset.c	Merge branch 'for-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2014-12-11 18:57:19 -08:00
crash_dump.c
cred.c
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	exit: fix race between wait_consider_task() and wait_task_zombie()	2015-01-08 15:10:51 -08:00
extable.c	ftrace/x86/extable: Add is_ftrace_trampoline() function	2014-11-19 15:25:26 -05:00
fork.c	mm: use new helper functions around the i_mmap_mutex	2014-12-13 12:42:45 -08:00
freezer.c
futex.c
futex_compat.c
groups.c	userns: Don't allow setgroups until a gid mapping has been setablished	2014-12-09 16:58:40 -06:00
hung_task.c
irq_work.c
jump_label.c
kallsyms.c
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kexec.c	kexec: remove unnecessary KERN_ERR from kexec.c	2014-12-13 12:42:51 -08:00
kmod.c	usermodehelper: kill the kmod_thread_locker logic	2014-12-10 17:41:17 -08:00
kprobes.c	module: remove mod arg from module_free, rename module_memfree().	2015-01-20 11:38:33 +10:30
ksysfs.c
kthread.c
latencytop.c
Makefile	kernel: res_counter: remove the unused API	2014-12-10 17:41:04 -08:00
module-internal.h
module.c	module: make module_refcount() a signed integer.	2015-01-22 11:15:54 +10:30
module_signing.c
notifier.c
nsproxy.c	bury struct proc_ns in fs/proc	2014-12-04 14:34:54 -05:00
padata.c
panic.c	kernel: add panic_on_warn	2014-12-10 17:41:10 -08:00
params.c	param: fix uninitialized read with CONFIG_DEBUG_LOCK_ALLOC	2015-01-20 11:38:31 +10:30
pid.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-12-16 15:53:03 -08:00
pid_namespace.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-12-16 15:53:03 -08:00
profile.c
ptrace.c	exit: ptrace: shift "reap dead" code from exit_ptrace() to forget_original_parent()	2014-12-10 17:41:10 -08:00
range.c	kernel: avoid overflow in cmp_range	2015-01-17 10:02:23 +13:00
reboot.c
relay.c
resource.c
seccomp.c
signal.c	Merge branch 'x86-mpx-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-12-10 09:34:43 -08:00
smp.c
smpboot.c
smpboot.h
softirq.c
stacktrace.c	stacktrace: introduce snprint_stack_trace for buffer output	2014-12-13 12:42:48 -08:00
stop_machine.c
sys.c	x86, mpx: Strictly enforce empty prctl() args	2015-01-22 21:11:06 +01:00
sys_ni.c	syscalls: implement execveat() system call	2014-12-13 12:42:51 -08:00
sysctl.c	As the merge window is still open, and this code was not as complex	2014-12-16 12:53:59 -08:00
sysctl_binary.c	kernel: add panic_on_warn	2014-12-10 17:41:10 -08:00
system_certificates.S
system_keyring.c
task_work.c
taskstats.c
test_kprobes.c
torture.c
tracepoint.c
tsacct.c
uid16.c	groups: Consolidate the setgroups permission checks	2014-12-05 17:19:27 -06:00
up.c
user-return-notifier.c
user.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2014-12-17 12:31:40 -08:00
user_namespace.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2014-12-17 12:31:40 -08:00
utsname.c	copy address of proc_ns_ops into ns_common	2014-12-04 14:34:47 -05:00
utsname_sysctl.c
watchdog.c
workqueue.c	workqueue: fix subtle pool management issue which can stall whole worker_pool	2015-01-16 14:21:16 -05:00
workqueue_internal.h