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Waiman Long 59da7942ca locking/lockdep: Add debug_locks check in __lock_downgrade() 
[ Upstream commit 513e1073d5 ]

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().

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>
2019-10-05 12:30:10 +02:00
..
bpf
bpf: fix bpf_jit_limit knob for PAGE_SIZE >= 64K
2019-08-25 10:51:50 +02:00
configs
…
debug
kdb: use memmove instead of overlapping memcpy
2018-12-08 13:05:05 +01:00
events
perf/core: Fix creating kernel counters for PMUs that override event->cpu
2019-08-25 10:51:35 +02:00
gcov
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irq
genirq: Prevent NULL pointer dereference in resend_irqs()
2019-09-21 07:14:04 +02:00
livepatch
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locking
locking/lockdep: Add debug_locks check in __lock_downgrade()
2019-10-05 12:30:10 +02:00
power
x86/power: Fix 'nosmt' vs hibernation triple fault during resume
2019-06-11 12:22:48 +02:00
printk
printk: Fix panic caused by passing log_buf_len to command line
2018-11-13 11:17:01 -08:00
rcu
rcuperf: Fix cleanup path for invalid perf_type strings
2019-05-31 06:48:30 -07:00
sched
sched/fair: Don't assign runtime for throttled cfs_rq
2019-09-16 08:19:32 +02:00
time
timer_list: Guard procfs specific code
2019-08-04 09:33:21 +02:00
trace
ftrace: Enable trampoline when rec count returns back to one
2019-08-06 18:29:35 +02:00
.gitignore
…
acct.c
…
async.c
…
audit_fsnotify.c
…
audit_tree.c
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audit_watch.c
audit: fix use-after-free in audit_add_watch
2018-09-26 08:36:37 +02:00
audit.c
audit: return on memory error to avoid null pointer dereference
2018-05-30 07:50:49 +02:00
audit.h
…
auditfilter.c
audit: fix a memory leak bug
2019-05-31 06:48:20 -07:00
auditsc.c
audit: allow not equal op for audit by executable
2018-08-03 07:55:25 +02:00
backtracetest.c
…
bounds.c
kbuild: fix kernel/bounds.c 'W=1' warning
2018-11-13 11:16:57 -08:00
capability.c
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cgroup_freezer.c
…
cgroup_pids.c
…
cgroup.c
cgroup: Fix deadlock in cpu hotplug path
2018-10-13 09:18:56 +02:00
compat.c
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configs.c
…
context_tracking.c
…
cpu_pm.c
…
cpu.c
cpu/speculation: Warn on unsupported mitigations= parameter
2019-07-10 09:55:39 +02:00
cpuset.c
…
crash_dump.c
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cred.c
access: avoid the RCU grace period for the temporary subjective credentials
2019-08-04 09:33:43 +02:00
delayacct.c
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dma.c
…
elfcore.c
…
exec_domain.c
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exit.c
kernel/exit.c: release ptraced tasks before zap_pid_ns_processes
2019-02-06 17:33:29 +01:00
extable.c
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fork.c
sched/fair: Don't free p->numa_faults with concurrent readers
2019-08-04 09:33:45 +02:00
freezer.c
…
futex_compat.c
…
futex.c
futex: Ensure that futex address is aligned in handle_futex_death()
2019-03-27 14:13:03 +09:00
groups.c
…
hung_task.c
kernel: hung_task.c: disable on suspend
2019-04-20 09:07:52 +02:00
irq_work.c
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jump_label.c
…
kallsyms.c
…
kcmp.c
…
Kconfig.freezer
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Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
…
kcov.c
kcov: ensure irq code sees a valid area
2018-08-03 07:55:12 +02:00
kexec_core.c
objtool, x86: Add several functions and files to the objtool whitelist
2018-06-05 10:28:57 +02:00
kexec_file.c
…
kexec_internal.h
…
kexec.c
…
kmod.c
…
kprobes.c
kprobes: Fix error check when reusing optimized probes
2019-04-27 09:34:45 +02:00
ksysfs.c
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kthread.c
kthread, tracing: Don't expose half-written comm when creating kthreads
2018-08-03 07:55:12 +02:00
latencytop.c
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Makefile
x86/uaccess, kcov: Disable stack protector
2019-06-22 08:17:19 +02:00
membarrier.c
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memremap.c
mm, devm_memremap_pages: kill mapping "System RAM" support
2019-01-13 10:03:51 +01:00
module_signing.c
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module-internal.h
…
module.c
kernel/module.c: Only return -EEXIST for modules that have finished loading
2019-08-06 18:29:35 +02:00
notifier.c
…
nsproxy.c
…
padata.c
padata: use smp_mb in padata_reorder to avoid orphaned padata jobs
2019-08-04 09:33:28 +02:00
panic.c
panic: avoid deadlocks in re-entrant console drivers
2018-12-29 13:40:16 +01:00
params.c
…
pid_namespace.c
signal/pid_namespace: Fix reboot_pid_ns to use send_sig not force_sig
2019-08-04 09:33:16 +02:00
pid.c
…
profile.c
…
ptrace.c
ptrace: Fix ->ptracer_cred handling for PTRACE_TRACEME
2019-07-10 09:55:45 +02:00
range.c
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reboot.c
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relay.c
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resource.c
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seccomp.c
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signal.c
kernel/signal.c: trace_signal_deliver when signal_group_exit
2019-06-11 12:22:43 +02:00
smp.c
cpu/hotplug: Fix SMT supported evaluation
2018-08-15 18:14:53 +02:00
smpboot.c
…
smpboot.h
…
softirq.c
Mark HI and TASKLET softirq synchronous
2018-08-15 18:14:42 +02:00
stacktrace.c
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stop_machine.c
stop_machine: Use raw spinlocks
2018-08-03 07:55:24 +02:00
sys_ni.c
…
sys.c
kernel/sys.c: prctl: fix false positive in validate_prctl_map()
2019-06-22 08:17:13 +02:00
sysctl_binary.c
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sysctl.c
sysctl: return -EINVAL if val violates minmax
2019-06-22 08:17:11 +02:00
task_work.c
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taskstats.c
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test_kprobes.c
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torture.c
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tracepoint.c
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tsacct.c
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ucount.c
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uid16.c
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up.c
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user_namespace.c
userns: move user access out of the mutex
2018-09-09 20:01:24 +02:00
user-return-notifier.c
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user.c
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utsname_sysctl.c
sys: don't hold uts_sem while accessing userspace memory
2018-09-09 20:01:24 +02:00
utsname.c
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watchdog_hld.c
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watchdog.c
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workqueue_internal.h
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workqueue.c
workqueue: use put_device() instead of kfree()
2018-05-30 07:50:36 +02:00