Peter Zijlstra f618b90b11 futex: Fix (possible) missed wakeup ...

[ Upstream commit b061c38bef ]

We must not rely on wake_q_add() to delay the wakeup; in particular
commit:

  1d0dcb3ad9 ("futex: Implement lockless wakeups")

moved wake_q_add() before smp_store_release(&q->lock_ptr, NULL), which
could result in futex_wait() waking before observing ->lock_ptr ==
NULL and going back to sleep again.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: 1d0dcb3ad9 ("futex: Implement lockless wakeups")
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2019-03-05 17:58:00 +01:00

..

bpf

bpf: Prevent memory disambiguation attack

2018-12-05 19:41:10 +01:00

cgroup

cgroup: fix parsing empty mount option string

2019-02-12 19:46:08 +01:00

configs

ANDROID: binder: add hwbinder,vndbinder to BINDER_DEVICES.

2017-08-22 18:43:23 -07:00

debug

kdb: Don't back trace on a cpu that didn't round up

2019-02-12 19:46:09 +01:00

events

perf/x86: Add check_period PMU callback

2019-02-20 10:20:52 +01:00

gcov

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

irq

genirq: Make sure the initial affinity is not empty

2019-03-05 17:57:59 +01:00

livepatch

livepatch: Validate module/old func name length

2018-09-09 19:55:58 +02:00

locking

futex: Handle early deadlock return correctly

2019-02-12 19:46:12 +01:00

power

PM / sleep: wakeup: Fix build error caused by missing SRCU support

2018-09-09 19:55:58 +02:00

printk

printk: Wake klogd when passing console_lock owner

2018-12-17 09:28:55 +01:00

rcu

rcu: Make need_resched() respond to urgent RCU-QS needs

2018-12-01 09:43:00 +01:00

sched

cpu/hotplug: Fix "SMT disabled by BIOS" detection for KVM

2019-02-12 19:46:13 +01:00

time

timekeeping: Use proper seqcount initializer

2019-02-12 19:46:01 +01:00

trace

tracing: Fix number of entries in trace header

2019-02-27 10:08:01 +01:00

.gitignore

…

acct.c

kernel/acct.c: fix the acct->needcheck check in check_free_space()

2018-01-10 09:31:17 +01:00

async.c

kernel/async.c: revert "async: simplify lowest_in_progress()"

2018-02-16 20:23:05 +01:00

audit_fsnotify.c

…

audit_tree.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

audit_watch.c

audit: fix use-after-free in audit_add_watch

2018-09-26 08:38:09 +02:00

audit.c

audit: return on memory error to avoid null pointer dereference

2018-05-30 07:52:39 +02:00

audit.h

ipc: mqueue: Replace timespec with timespec64

2017-09-03 20:21:24 -04:00

auditfilter.c

audit: allow not equal op for audit by executable

2018-08-03 07:50:39 +02:00

auditsc.c

audit: fix potential null dereference 'context->module.name'

2018-08-06 16:20:49 +02:00

backtracetest.c

…

bounds.c

kbuild: fix kernel/bounds.c 'W=1' warning

2018-11-13 11:15:08 -08:00

capability.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

compat.c

compat: fix 4-byte infoleak via uninitialized struct field

2018-05-16 10:10:26 +02:00

configs.c

…

context_tracking.c

…

cpu_pm.c

PM / CPU: replace raw_notifier with atomic_notifier

2017-07-31 13:09:49 +02:00

cpu.c

cpu/hotplug: Fix "SMT disabled by BIOS" detection for KVM

2019-02-12 19:46:13 +01:00

crash_core.c

kdump: write correct address of mem_section into vmcoreinfo

2018-01-17 09:45:27 +01:00

crash_dump.c

…

cred.c

…

delayacct.c

delayacct: Use raw_spinlocks

2018-08-03 07:50:38 +02:00

dma.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

elfcore.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

exec_domain.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

exit.c

sched/wait: Fix rcuwait_wake_up() ordering

2019-03-05 17:58:00 +01:00

extable.c

extable: Enable RCU if it is not watching in kernel_text_address()

2017-09-23 16:50:20 -04:00

fork.c

fork: record start_time late

2019-01-13 10:01:02 +01:00

freezer.c

…

futex_compat.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

futex.c

futex: Fix (possible) missed wakeup

2019-03-05 17:58:00 +01:00

groups.c

kernel: make groups_sort calling a responsibility group_info allocators

2017-12-20 10:10:18 +01:00

hung_task.c

kernel/hung_task.c: force console verbose before panic

2019-02-12 19:46:10 +01:00

irq_work.c

…

jump_label.c

sched/core: Fix cpu.max vs. cpuhotplug deadlock

2018-12-05 19:41:17 +01:00

kallsyms.c

kernel/kallsyms.c: replace all_var with IS_ENABLED(CONFIG_KALLSYMS_ALL)

2017-07-10 16:32:34 -07:00

kcmp.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

Kconfig.freezer

…

Kconfig.hz

…

Kconfig.locks

…

Kconfig.preempt

…

kcov.c

kcov: ensure irq code sees a valid area

2018-08-03 07:50:22 +02:00

kexec_core.c

x86/mm, kexec: Allow kexec to be used with SME

2017-07-18 11:38:04 +02:00

kexec_file.c

kexec_file: adjust declaration of kexec_purgatory

2017-07-12 16:26:02 -07:00

kexec_internal.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

kexec.c

kdump: protect vmcoreinfo data under the crash memory

2017-07-12 16:26:00 -07:00

kmod.c

kmod: move #ifdef CONFIG_MODULES wrapper to Makefile

2017-09-08 18:26:51 -07:00

kprobes.c

kprobes: Return error if we fail to reuse kprobe instead of BUG_ON()

2018-11-13 11:14:55 -08:00

ksysfs.c

kexec: move vmcoreinfo out of the kernel's .bss section

2017-07-12 16:25:59 -07:00

kthread.c

kthread, tracing: Don't expose half-written comm when creating kthreads

2018-08-03 07:50:21 +02:00

latencytop.c

…

Makefile

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

memremap.c

mm, devm_memremap_pages: kill mapping "System RAM" support

2019-01-13 10:01:02 +01:00

module_signing.c

…

module-internal.h

…

module.c

kobject: return error code if writing /sys/.../uevent fails

2019-02-12 19:46:02 +01:00

notifier.c

…

nsproxy.c

…

padata.c

…

panic.c

panic: avoid deadlocks in re-entrant console drivers

2018-12-29 13:39:10 +01:00

params.c

kernel/params.c: improve STANDARD_PARAM_DEF readability

2017-10-03 17:54:26 -07:00

pid_namespace.c

userns,pidns: Verify the userns for new pid namespaces

2017-07-20 07:43:58 -05:00

pid.c

pids: make task_tgid_nr_ns() safe

2017-08-21 12:47:31 -07:00

profile.c

…

ptrace.c

ptrace: Remove unused ptrace_may_access_sched() and MODE_IBRS

2018-12-05 19:41:21 +01:00

range.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

reboot.c

…

relay.c

kernel/relay.c: limit kmalloc size to KMALLOC_MAX_SIZE

2018-05-30 07:52:00 +02:00

resource.c

resource: fix integer overflow at reallocation

2018-04-24 09:36:22 +02:00

seccomp.c

seccomp: Move speculation migitation control to arch code

2018-05-22 18:54:04 +02:00

signal.c

signal: Restore the stop PTRACE_EVENT_EXIT

2019-02-20 10:20:54 +01:00

smp.c

cpu/hotplug: Fix "SMT disabled by BIOS" detection for KVM

2019-02-12 19:46:13 +01:00

smpboot.c

watchdog/core, powerpc: Lock cpus across reconfiguration

2017-10-04 10:53:54 +02:00

smpboot.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

softirq.c

Mark HI and TASKLET softirq synchronous

2018-08-15 18:12:47 +02:00

stacktrace.c

…

stop_machine.c

stop_machine: Atomically queue and wake stopper threads

2018-09-05 09:26:36 +02:00

sys_ni.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

sys.c

sys: don't hold uts_sem while accessing userspace memory

2018-09-09 19:56:00 +02:00

sysctl_binary.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

sysctl.c

proc/sysctl: fix return error for proc_doulongvec_minmax()

2019-02-12 19:46:09 +01:00

task_work.c

locking/barriers: Convert users of lockless_dereference() to READ_ONCE()

2017-12-25 14:26:21 +01:00

taskstats.c

…

test_kprobes.c

…

torture.c

torture: Fix typo suppressing CPU-hotplug statistics

2017-07-25 13:04:45 -07:00

tracepoint.c

tracepoint: Do not warn on ENOMEM

2018-05-09 09:51:50 +02:00

tsacct.c

…

ucount.c

…

uid16.c

kernel: make groups_sort calling a responsibility group_info allocators

2017-12-20 10:10:18 +01:00

umh.c

kmod: split out umh code into its own file

2017-09-08 18:26:50 -07:00

up.c

smp: Avoid using two cache lines for struct call_single_data

2017-08-29 15:14:38 +02:00

user_namespace.c

userns: move user access out of the mutex

2018-09-09 19:56:00 +02:00

user-return-notifier.c

…

user.c

…

utsname_sysctl.c

sys: don't hold uts_sem while accessing userspace memory

2018-09-09 19:56:00 +02:00

utsname.c

…

watchdog_hld.c

watchdog: Mark watchdog touch functions as notrace

2018-09-05 09:26:42 +02:00

watchdog.c

watchdog: Mark watchdog touch functions as notrace

2018-09-05 09:26:42 +02:00

workqueue_internal.h

Merge branch 'for-4.14-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

2017-11-06 12:26:49 -08:00

workqueue.c

watchdog: Mark watchdog touch functions as notrace

2018-09-05 09:26:42 +02:00