From: Imre Deak imre.deak@intel.com
[ Upstream commit 8c8889d8eaf4501ae4aaf870b6f8f55db5d5109a ]
The sequence
static DEFINE_WW_CLASS(test_ww_class);
struct ww_acquire_ctx ww_ctx; struct ww_mutex ww_lock_a; struct ww_mutex ww_lock_b; struct mutex lock_c; struct mutex lock_d;
ww_acquire_init(&ww_ctx, &test_ww_class);
ww_mutex_init(&ww_lock_a, &test_ww_class); ww_mutex_init(&ww_lock_b, &test_ww_class);
mutex_init(&lock_c);
ww_mutex_lock(&ww_lock_a, &ww_ctx);
mutex_lock(&lock_c);
ww_mutex_lock(&ww_lock_b, &ww_ctx);
mutex_unlock(&lock_c); (*)
ww_mutex_unlock(&ww_lock_b); ww_mutex_unlock(&ww_lock_a);
ww_acquire_fini(&ww_ctx);
triggers the following WARN in __lock_release() when doing the unlock at *:
DEBUG_LOCKS_WARN_ON(curr->lockdep_depth != depth - 1);
The problem is that the WARN check doesn't take into account the merging of ww_lock_a and ww_lock_b which results in decreasing curr->lockdep_depth by 2 not only 1.
Note that the following sequence doesn't trigger the WARN, since there won't be any hlock merging.
ww_acquire_init(&ww_ctx, &test_ww_class);
ww_mutex_init(&ww_lock_a, &test_ww_class); ww_mutex_init(&ww_lock_b, &test_ww_class);
mutex_init(&lock_c); mutex_init(&lock_d);
ww_mutex_lock(&ww_lock_a, &ww_ctx);
mutex_lock(&lock_c); mutex_lock(&lock_d);
ww_mutex_lock(&ww_lock_b, &ww_ctx);
mutex_unlock(&lock_d);
ww_mutex_unlock(&ww_lock_b); ww_mutex_unlock(&ww_lock_a);
mutex_unlock(&lock_c);
ww_acquire_fini(&ww_ctx);
In general both of the above two sequences are valid and shouldn't trigger any lockdep warning.
Fix this by taking the decrement due to the hlock merging into account during lock release and hlock class re-setting. Merging can't happen during lock downgrading since there won't be a new possibility to merge hlocks in that case, so add a WARN if merging still happens then.
Signed-off-by: Imre Deak imre.deak@intel.com 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 Cc: Will Deacon will.deacon@arm.com Cc: ville.syrjala@linux.intel.com Link: https://lkml.kernel.org/r/20190524201509.9199-1-imre.deak@intel.com Signed-off-by: Ingo Molnar mingo@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/locking/lockdep.c | 41 ++++++++++++++++++++++++++++------------ 1 file changed, 29 insertions(+), 12 deletions(-)
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index e221be724fe8..2ecc12cd11d0 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -3623,7 +3623,7 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass, hlock->references = 2; }
- return 1; + return 2; } }
@@ -3829,22 +3829,33 @@ static struct held_lock *find_held_lock(struct task_struct *curr, }
static int reacquire_held_locks(struct task_struct *curr, unsigned int depth, - int idx) + int idx, unsigned int *merged) { struct held_lock *hlock; + int first_idx = idx;
if (DEBUG_LOCKS_WARN_ON(!irqs_disabled())) return 0;
for (hlock = curr->held_locks + idx; idx < depth; idx++, hlock++) { - if (!__lock_acquire(hlock->instance, + switch (__lock_acquire(hlock->instance, hlock_class(hlock)->subclass, hlock->trylock, hlock->read, hlock->check, hlock->hardirqs_off, hlock->nest_lock, hlock->acquire_ip, - hlock->references, hlock->pin_count)) + hlock->references, hlock->pin_count)) { + case 0: return 1; + case 1: + break; + case 2: + *merged += (idx == first_idx); + break; + default: + WARN_ON(1); + return 0; + } } return 0; } @@ -3855,9 +3866,9 @@ __lock_set_class(struct lockdep_map *lock, const char *name, unsigned long ip) { struct task_struct *curr = current; + unsigned int depth, merged = 0; struct held_lock *hlock; struct lock_class *class; - unsigned int depth; int i;
if (unlikely(!debug_locks)) @@ -3882,14 +3893,14 @@ __lock_set_class(struct lockdep_map *lock, const char *name, curr->lockdep_depth = i; curr->curr_chain_key = hlock->prev_chain_key;
- if (reacquire_held_locks(curr, depth, i)) + if (reacquire_held_locks(curr, depth, i, &merged)) return 0;
/* * I took it apart and put it back together again, except now I have * these 'spare' parts.. where shall I put them. */ - if (DEBUG_LOCKS_WARN_ON(curr->lockdep_depth != depth)) + if (DEBUG_LOCKS_WARN_ON(curr->lockdep_depth != depth - merged)) return 0; return 1; } @@ -3897,8 +3908,8 @@ __lock_set_class(struct lockdep_map *lock, const char *name, static int __lock_downgrade(struct lockdep_map *lock, unsigned long ip) { struct task_struct *curr = current; + unsigned int depth, merged = 0; struct held_lock *hlock; - unsigned int depth; int i;
if (unlikely(!debug_locks)) @@ -3923,7 +3934,11 @@ static int __lock_downgrade(struct lockdep_map *lock, unsigned long ip) hlock->read = 1; hlock->acquire_ip = ip;
- if (reacquire_held_locks(curr, depth, i)) + if (reacquire_held_locks(curr, depth, i, &merged)) + return 0; + + /* Merging can't happen with unchanged classes.. */ + if (DEBUG_LOCKS_WARN_ON(merged)) return 0;
/* @@ -3932,6 +3947,7 @@ static int __lock_downgrade(struct lockdep_map *lock, unsigned long ip) */ if (DEBUG_LOCKS_WARN_ON(curr->lockdep_depth != depth)) return 0; + return 1; }
@@ -3946,8 +3962,8 @@ static int __lock_release(struct lockdep_map *lock, int nested, unsigned long ip) { struct task_struct *curr = current; + unsigned int depth, merged = 1; struct held_lock *hlock; - unsigned int depth; int i;
if (unlikely(!debug_locks)) @@ -4002,14 +4018,15 @@ __lock_release(struct lockdep_map *lock, int nested, unsigned long ip) if (i == depth-1) return 1;
- if (reacquire_held_locks(curr, depth, i + 1)) + if (reacquire_held_locks(curr, depth, i + 1, &merged)) return 0;
/* * We had N bottles of beer on the wall, we drank one, but now * there's not N-1 bottles of beer left on the wall... + * Pouring two of the bottles together is acceptable. */ - DEBUG_LOCKS_WARN_ON(curr->lockdep_depth != depth-1); + DEBUG_LOCKS_WARN_ON(curr->lockdep_depth != depth - merged);
/* * Since reacquire_held_locks() would have called check_chain_key()