From: Boqun Feng <boqun.feng@gmail.com>
To: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Will Deacon <will@kernel.org>,
Jonathan Corbet <corbet@lwn.net>,
Waiman Long <longman@redhat.com>,
Boqun Feng <boqun.feng@gmail.com>
Subject: [RFC v7 19/19] lockdep/selftest: Introduce recursion3
Date: Fri, 7 Aug 2020 15:42:38 +0800 [thread overview]
Message-ID: <20200807074238.1632519-20-boqun.feng@gmail.com> (raw)
In-Reply-To: <20200807074238.1632519-1-boqun.feng@gmail.com>
Add a test case shows that USED_IN_*_READ and ENABLE_*_READ can cause
deadlock too.
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
---
lib/locking-selftest.c | 55 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 55 insertions(+)
diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c
index 17f8f6f37165..a899b3f0e2e5 100644
--- a/lib/locking-selftest.c
+++ b/lib/locking-selftest.c
@@ -1249,6 +1249,60 @@ GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_rlock)
#include "locking-selftest-wlock.h"
GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_wlock)
+#undef E1
+#undef E2
+#undef E3
+/*
+ * read-lock / write-lock recursion that is unsafe.
+ *
+ * A is a ENABLED_*_READ lock
+ * B is a USED_IN_*_READ lock
+ *
+ * read_lock(A);
+ * write_lock(B);
+ * <interrupt>
+ * read_lock(B);
+ * write_lock(A); // if this one is read_lock(), no deadlock
+ */
+
+#define E1() \
+ \
+ IRQ_DISABLE(); \
+ WL(B); \
+ LOCK(A); \
+ UNLOCK(A); \
+ WU(B); \
+ IRQ_ENABLE();
+
+#define E2() \
+ \
+ RL(A); \
+ RU(A); \
+
+#define E3() \
+ \
+ IRQ_ENTER(); \
+ RL(B); \
+ RU(B); \
+ IRQ_EXIT();
+
+/*
+ * Generate 24 testcases:
+ */
+#include "locking-selftest-hardirq.h"
+#include "locking-selftest-rlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_hard_rlock)
+
+#include "locking-selftest-wlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_hard_wlock)
+
+#include "locking-selftest-softirq.h"
+#include "locking-selftest-rlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_rlock)
+
+#include "locking-selftest-wlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_wlock)
+
#ifdef CONFIG_DEBUG_LOCK_ALLOC
# define I_SPINLOCK(x) lockdep_reset_lock(&lock_##x.dep_map)
# define I_RWLOCK(x) lockdep_reset_lock(&rwlock_##x.dep_map)
@@ -2413,6 +2467,7 @@ void locking_selftest(void)
DO_TESTCASE_6x2x2RW("irq read-recursion", irq_read_recursion);
DO_TESTCASE_6x2x2RW("irq read-recursion #2", irq_read_recursion2);
+ DO_TESTCASE_6x2x2RW("irq read-recursion #3", irq_read_recursion3);
ww_tests();
--
2.28.0
next prev parent reply other threads:[~2020-08-07 7:47 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-07 7:42 [RFC v7 00/19] lockdep: Support deadlock detection for recursive read locks Boqun Feng
2020-08-07 7:42 ` [RFC v7 01/19] locking: More accurate annotations for read_lock() Boqun Feng
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2020-08-07 7:42 ` [RFC v7 02/19] lockdep/Documention: Recursive read lock detection reasoning Boqun Feng
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2020-08-07 7:42 ` [RFC v7 03/19] lockdep: Demagic the return value of BFS Boqun Feng
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2020-08-07 7:42 ` [RFC v7 04/19] lockdep: Make __bfs() visit every dependency until a match Boqun Feng
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2020-08-07 7:42 ` [RFC v7 05/19] lockdep: Reduce the size of lock_list::distance Boqun Feng
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2020-08-07 7:42 ` [RFC v7 06/19] lockdep: Introduce lock_list::dep Boqun Feng
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2020-08-07 7:42 ` [RFC v7 07/19] lockdep: Extend __bfs() to work with multiple types of dependencies Boqun Feng
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2020-08-07 7:42 ` [RFC v7 08/19] lockdep: Make __bfs(.match) return bool Boqun Feng
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2020-08-07 7:42 ` [RFC v7 09/19] lockdep: Support deadlock detection for recursive read locks in check_noncircular() Boqun Feng
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2020-08-07 7:42 ` [RFC v7 10/19] lockdep: Adjust check_redundant() for recursive read change Boqun Feng
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2020-08-07 7:42 ` [RFC v7 11/19] lockdep: Fix recursive read lock related safe->unsafe detection Boqun Feng
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2020-09-15 18:32 ` [RFC v7 11/19] " Qian Cai
2020-09-16 8:10 ` Boqun Feng
2020-09-16 16:14 ` Boqun Feng
2020-09-16 21:11 ` Qian Cai
2020-09-17 1:53 ` Boqun Feng
2020-08-07 7:42 ` [RFC v7 12/19] lockdep: Add recursive read locks into dependency graph Boqun Feng
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2020-09-14 18:16 ` [RFC v7 12/19] " Qian Cai
2020-09-14 22:04 ` Qian Cai
2020-08-07 7:42 ` [RFC v7 13/19] lockdep/selftest: Add a R-L/L-W test case specific to chain cache behavior Boqun Feng
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2020-08-07 7:42 ` [RFC v7 14/19] lockdep: Take read/write status in consideration when generate chainkey Boqun Feng
2020-08-21 17:41 ` Peter Zijlstra
2020-08-22 2:52 ` boqun.feng
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2020-08-07 7:42 ` [RFC v7 15/19] lockdep/selftest: Unleash irq_read_recursion2 and add more Boqun Feng
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2020-08-07 7:42 ` [RFC v7 16/19] lockdep/selftest: Add more recursive read related test cases Boqun Feng
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2020-08-07 7:42 ` [RFC v7 17/19] Revert "locking/lockdep/selftests: Fix mixed read-write ABBA tests" Boqun Feng
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2020-08-07 7:42 ` [RFC v7 18/19] locking/selftest: Add test cases for queued_read_lock() Boqun Feng
2020-08-27 7:54 ` [tip: locking/core] " tip-bot2 for Boqun Feng
2020-08-07 7:42 ` Boqun Feng [this message]
2020-08-27 7:54 ` [tip: locking/core] lockdep/selftest: Introduce recursion3 tip-bot2 for Boqun Feng
2020-08-21 19:56 ` [RFC v7 00/19] lockdep: Support deadlock detection for recursive read locks Peter Zijlstra
2020-08-23 1:12 ` boqun.feng
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