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thread: spinlock aborts print stack traces

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Debug builds have information about when each spinlock was initialized,
last locked and last unlocked. This commit logs that information when
a spinlock operation aborts.

Signed-off-by: Mike Gerdts <mgerdts@nvidia.com>
Change-Id: I11232f4000f04d222dcaaed44c46303b7ea6cf6b
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/16001
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Shuhei Matsumoto <smatsumoto@nvidia.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Mike Gerdts 2022-12-16 20:50:02 -06:00 committed by Jim Harris
parent adc2ca50e9
commit 3d9395c69e
1 changed files with 52 additions and 14 deletions
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66
lib/thread/thread.c
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@ -212,18 +212,20 @@ __posix_abort(enum spin_error err)
typedef void (*spin_abort)(enum spin_error err);
spin_abort g_spin_abort_fn = __posix_abort;
#define SPIN_ASSERT_IMPL(cond, err, ret) \
#define SPIN_ASSERT_IMPL(cond, err, extra_log, ret) \
do { \
if (spdk_unlikely(!(cond))) { \
SPDK_ERRLOG("unrecoverable spinlock error %d: %s (%s)\n", err, \
SPIN_ERROR_STRING(err), #cond); \
extra_log; \
g_spin_abort_fn(err); \
ret; \
} \
} while (0)
#define SPIN_ASSERT_RETURN_VOID(cond, err) SPIN_ASSERT_IMPL(cond, err, return)
#define SPIN_ASSERT_RETURN(cond, err, ret) SPIN_ASSERT_IMPL(cond, err, return ret)
#define SPIN_ASSERT(cond, err) SPIN_ASSERT_IMPL(cond, err,)
#define SPIN_ASSERT_LOG_STACKS(cond, err, lock) \
SPIN_ASSERT_IMPL(cond, err, sspin_stacks_print(sspin), return)
#define SPIN_ASSERT_RETURN(cond, err, ret) SPIN_ASSERT_IMPL(cond, err, , return ret)
#define SPIN_ASSERT(cond, err) SPIN_ASSERT_IMPL(cond, err, ,)
struct io_device {
void *io_device;
@ -2923,6 +2925,42 @@ sspin_fini_internal(struct spdk_spinlock *sspin)
#define SSPIN_GET_STACK(sspin, which) do { } while (0)
#endif
static void
sspin_stack_print(const char *title, const struct sspin_stack *sspin_stack)
{
char **stack;
size_t i;
stack = backtrace_symbols(sspin_stack->addrs, sspin_stack->depth);
if (stack == NULL) {
SPDK_ERRLOG("Out of memory while allocate stack for %s\n", title);
return;
}
SPDK_ERRLOG(" %s:\n", title);
for (i = 0; i < sspin_stack->depth; i++) {
/*
* This does not print line numbers. In gdb, use something like "list *0x444b6b" or
* "list *sspin_stack->addrs[0]". Or more conveniently, load the spdk gdb macros
* and use use "print *sspin" or "print sspin->internal.lock_stack". See
* gdb_macros.md in the docs directory for details.
*/
SPDK_ERRLOG(" #%" PRIu64 ": %s\n", i, stack[i]);
}
free(stack);
}
static void
sspin_stacks_print(const struct spdk_spinlock *sspin)
{
if (sspin->internal == NULL) {
return;
}
SPDK_ERRLOG("spinlock %p\n", sspin);
sspin_stack_print("Lock initalized at", &sspin->internal->init_stack);
sspin_stack_print("Last locked at", &sspin->internal->lock_stack);
sspin_stack_print("Last unlocked at", &sspin->internal->unlock_stack);
}
void
spdk_spin_init(struct spdk_spinlock *sspin)
{
@ -2930,7 +2968,7 @@ spdk_spin_init(struct spdk_spinlock *sspin)
memset(sspin, 0, sizeof(*sspin));
rc = pthread_spin_init(&sspin->spinlock, PTHREAD_PROCESS_PRIVATE);
SPIN_ASSERT_RETURN_VOID(rc == 0, SPIN_ERR_PTHREAD);
SPIN_ASSERT_LOG_STACKS(rc == 0, SPIN_ERR_PTHREAD, sspin);
sspin_init_internal(sspin);
SSPIN_GET_STACK(sspin, init);
}
@ -2940,10 +2978,10 @@ spdk_spin_destroy(struct spdk_spinlock *sspin)
{
int rc;
SPIN_ASSERT_RETURN_VOID(sspin->thread == NULL, SPIN_ERR_LOCK_HELD);
SPIN_ASSERT_LOG_STACKS(sspin->thread == NULL, SPIN_ERR_LOCK_HELD, sspin);
rc = pthread_spin_destroy(&sspin->spinlock);
SPIN_ASSERT_RETURN_VOID(rc == 0, SPIN_ERR_PTHREAD);
SPIN_ASSERT_LOG_STACKS(rc == 0, SPIN_ERR_PTHREAD, sspin);
sspin_fini_internal(sspin);
}
@ -2954,11 +2992,11 @@ spdk_spin_lock(struct spdk_spinlock *sspin)
struct spdk_thread *thread = spdk_get_thread();
int rc;
SPIN_ASSERT_RETURN_VOID(thread != NULL, SPIN_ERR_NOT_SPDK_THREAD);
SPIN_ASSERT_RETURN_VOID(thread != sspin->thread, SPIN_ERR_DEADLOCK);
SPIN_ASSERT_LOG_STACKS(thread != NULL, SPIN_ERR_NOT_SPDK_THREAD, sspin);
SPIN_ASSERT_LOG_STACKS(thread != sspin->thread, SPIN_ERR_DEADLOCK, sspin);
rc = pthread_spin_lock(&sspin->spinlock);
SPIN_ASSERT_RETURN_VOID(rc == 0, SPIN_ERR_PTHREAD);
SPIN_ASSERT_LOG_STACKS(rc == 0, SPIN_ERR_PTHREAD, sspin);
sspin->thread = thread;
sspin->thread->lock_count++;
@ -2972,17 +3010,17 @@ spdk_spin_unlock(struct spdk_spinlock *sspin)
struct spdk_thread *thread = spdk_get_thread();
int rc;
SPIN_ASSERT_RETURN_VOID(thread != NULL, SPIN_ERR_NOT_SPDK_THREAD);
SPIN_ASSERT_RETURN_VOID(thread == sspin->thread, SPIN_ERR_WRONG_THREAD);
SPIN_ASSERT_LOG_STACKS(thread != NULL, SPIN_ERR_NOT_SPDK_THREAD, sspin);
SPIN_ASSERT_LOG_STACKS(thread == sspin->thread, SPIN_ERR_WRONG_THREAD, sspin);
SPIN_ASSERT_RETURN_VOID(thread->lock_count > 0, SPIN_ERR_LOCK_COUNT);
SPIN_ASSERT_LOG_STACKS(thread->lock_count > 0, SPIN_ERR_LOCK_COUNT, sspin);
thread->lock_count--;
sspin->thread = NULL;
SSPIN_GET_STACK(sspin, unlock);
rc = pthread_spin_unlock(&sspin->spinlock);
SPIN_ASSERT_RETURN_VOID(rc == 0, SPIN_ERR_PTHREAD);
SPIN_ASSERT_LOG_STACKS(rc == 0, SPIN_ERR_PTHREAD, sspin);
}
bool