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885c898a00ef1d19b355407cae71ac479f9cd6e4
i2som-imx-linux/kernel
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Waiman Long 885c898a00 locking/lockdep: Add debug_locks check in __lock_downgrade() 
[ Upstream commit 7149258057 ]

Tetsuo Handa had reported he saw an incorrect "downgrading a read lock"
warning right after a previous lockdep warning. It is likely that the
previous warning turned off lock debugging causing the lockdep to have
inconsistency states leading to the lock downgrade warning.

Fix that by add a check for debug_locks at the beginning of
__lock_downgrade().

Debugged-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Reported-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Reported-by: syzbot+53383ae265fb161ef488@syzkaller.appspotmail.com
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Link: https://lkml.kernel.org/r/1547093005-26085-1-git-send-email-longman@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-10-05 12:47:36 +02:00
..
bpf
bpf: fix bpf_jit_limit knob for PAGE_SIZE >= 64K
2019-08-25 10:50:23 +02:00
cgroup
cgroup: Fix css_task_iter_advance_css_set() cset skip condition
2019-08-09 17:53:37 +02:00
configs
…
debug
kdb: Don't back trace on a cpu that didn't round up
2019-02-12 19:46:09 +01:00
events
perf/core: Fix creating kernel counters for PMUs that override event->cpu
2019-08-16 10:13:55 +02:00
gcov
…
irq
genirq: Prevent NULL pointer dereference in resend_irqs()
2019-09-19 09:08:04 +02:00
livepatch
module: Fix livepatch/ftrace module text permissions race
2019-07-10 09:54:37 +02:00
locking
locking/lockdep: Add debug_locks check in __lock_downgrade()
2019-10-05 12:47:36 +02:00
power
x86/power: Fix 'nosmt' vs hibernation triple fault during resume
2019-06-11 12:21:48 +02:00
printk
printk: Wake klogd when passing console_lock owner
2018-12-17 09:28:55 +01:00
rcu
rcuperf: Fix cleanup path for invalid perf_type strings
2019-05-31 06:47:33 -07:00
sched
sched/fair: Don't assign runtime for throttled cfs_rq
2019-09-16 08:20:43 +02:00
time
timer_list: Guard procfs specific code
2019-07-31 07:28:28 +02:00
trace
ftrace: Check for empty hash and comment the race with registering probes
2019-09-06 10:20:55 +02:00
.gitignore
…
acct.c
…
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
…
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
…
auditfilter.c
audit: fix a memory leak bug
2019-05-31 06:47:25 -07:00
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
…
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
…
cpu.c
cpu/hotplug: Fix out-of-bounds read when setting fail state
2019-07-21 09:04:40 +02:00
crash_core.c
…
crash_dump.c
…
cred.c
access: avoid the RCU grace period for the temporary subjective credentials
2019-07-31 07:28:58 +02:00
delayacct.c
delayacct: Use raw_spinlocks
2018-08-03 07:50:38 +02:00
dma.c
…
elfcore.c
…
exec_domain.c
…
exit.c
cgroup: Call cgroup_release() before __exit_signal()
2019-08-09 17:53:36 +02:00
extable.c
…
fork.c
sched/fair: Don't free p->numa_faults with concurrent readers
2019-08-04 09:32:03 +02:00
freezer.c
…
futex_compat.c
…
futex.c
locking/futex: Allow low-level atomic operations to return -EAGAIN
2019-05-10 17:53:15 +02:00
groups.c
…
hung_task.c
kernel: hung_task.c: disable on suspend
2019-04-20 09:15:05 +02:00
irq_work.c
…
jump_label.c
sched/core: Fix cpu.max vs. cpuhotplug deadlock
2018-12-05 19:41:17 +01:00
kallsyms.c
kallsyms: Don't let kallsyms_lookup_size_offset() fail on retrieving the first symbol
2019-09-21 07:15:38 +02:00
kcmp.c
…
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
…
kexec_file.c
…
kexec_internal.h
…
kexec.c
…
kmod.c
…
kprobes.c
kprobes: Fix potential deadlock in kprobe_optimizer()
2019-09-10 10:32:16 +01:00
ksysfs.c
…
kthread.c
kthread, tracing: Don't expose half-written comm when creating kthreads
2018-08-03 07:50:21 +02:00
latencytop.c
…
Makefile
x86/uaccess, kcov: Disable stack protector
2019-06-19 08:20:56 +02:00
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
kernel/module: Fix mem leak in module_add_modinfo_attrs
2019-09-16 08:20:46 +02:00
notifier.c
…
nsproxy.c
…
padata.c
padata: use smp_mb in padata_reorder to avoid orphaned padata jobs
2019-07-31 07:28:39 +02:00
panic.c
panic: avoid deadlocks in re-entrant console drivers
2018-12-29 13:39:10 +01:00
params.c
…
pid_namespace.c
signal/pid_namespace: Fix reboot_pid_ns to use send_sig not force_sig
2019-07-31 07:28:21 +02:00
pid.c
…
profile.c
…
ptrace.c
ptrace: Fix ->ptracer_cred handling for PTRACE_TRACEME
2019-07-10 09:54:38 +02:00
range.c
…
reboot.c
…
relay.c
relay: check return of create_buf_file() properly
2019-03-13 14:03:20 -07:00
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
kernel/signal.c: trace_signal_deliver when signal_group_exit
2019-06-09 09:18:17 +02:00
smp.c
cpu/hotplug: Fix "SMT disabled by BIOS" detection for KVM
2019-02-12 19:46:13 +01:00
smpboot.c
…
smpboot.h
…
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
…
sys.c
kernel/sys.c: prctl: fix false positive in validate_prctl_map()
2019-06-15 11:54:52 +02:00
sysctl_binary.c
…
sysctl.c
sysctl: return -EINVAL if val violates minmax
2019-06-15 11:54:51 +02:00
task_work.c
…
taskstats.c
…
test_kprobes.c
…
torture.c
…
tracepoint.c
tracepoint: Do not warn on ENOMEM
2018-05-09 09:51:50 +02:00
tsacct.c
…
ucount.c
…
uid16.c
…
umh.c
…
up.c
…
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
…
workqueue.c
watchdog: Mark watchdog touch functions as notrace
2018-09-05 09:26:42 +02:00