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c8267e10c6
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Waiman Long c8267e10c6 locking/lockdep: Add debug_locks check in __lock_downgrade() 
commit 71492580571467fb7177aade19c18ce7486267f5 upstream.

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-04-06 10:58:18 +02:00
..
bpf A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
configs A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
debug A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
events A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
gcov A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
irq A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
livepatch A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
locking locking/lockdep: Add debug_locks check in __lock_downgrade() 2020-04-06 10:58:18 +02:00
power A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
printk A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
rcu A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
sched A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
time A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
trace A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
acct.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
async.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
audit_fsnotify.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
audit_tree.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
audit_watch.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
audit.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
audit.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
auditfilter.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
auditsc.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
backtracetest.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
bounds.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
capability.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
cgroup_freezer.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
cgroup_pids.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
cgroup.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
compat.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
configs.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
context_tracking.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
cpu_pm.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
cpu.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
cpuset.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
crash_dump.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
cred.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
delayacct.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
dma.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
elfcore.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
exec_domain.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
exit.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
extable.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
fork.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
freezer.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
futex_compat.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
futex.c futex: Ensure that futex address is aligned in handle_futex_death() 2020-04-06 10:58:14 +02:00
groups.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
hung_task.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
irq_work.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
jump_label.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kallsyms.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kaslr.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kcmp.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
Kconfig.freezer A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
Kconfig.hz A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
Kconfig.locks A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
Kconfig.preempt A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kcov.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kexec_core.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kexec_file.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kexec_internal.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kexec.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kmod.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kprobes.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
ksysfs.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
kthread.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
latencytop.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
Makefile A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
membarrier.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
memremap.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
module_signing.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
module-internal.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
module.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
notifier.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
nsproxy.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
padata.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
panic.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
params.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
pid_namespace.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
pid.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
profile.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
ptrace.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
range.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
reboot.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
relay.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
resource.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
seccomp.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
signal.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
smp.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
smpboot.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
smpboot.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
softirq.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
stacktrace.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
stop_machine.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
sys_ni.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
sys.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
sysctl_binary.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
sysctl.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
task_work.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
taskstats.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
test_kprobes.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
torture.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
tracepoint.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
tsacct.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
uid16.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
up.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
user_namespace.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
user-return-notifier.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
user.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
utsname_sysctl.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
utsname.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
watchdog.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
workqueue_internal.h A750FXXU4CTBC 2020-03-27 21:51:54 +05:30
workqueue.c A750FXXU4CTBC 2020-03-27 21:51:54 +05:30