Release 4.7 kernel/locking/rtmutex-debug.c
/*
* RT-Mutexes: blocking mutual exclusion locks with PI support
*
* started by Ingo Molnar and Thomas Gleixner:
*
* Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
* Copyright (C) 2006 Timesys Corp., Thomas Gleixner <tglx@timesys.com>
*
* This code is based on the rt.c implementation in the preempt-rt tree.
* Portions of said code are
*
* Copyright (C) 2004 LynuxWorks, Inc., Igor Manyilov, Bill Huey
* Copyright (C) 2006 Esben Nielsen
* Copyright (C) 2006 Kihon Technologies Inc.,
* Steven Rostedt <rostedt@goodmis.org>
*
* See rt.c in preempt-rt for proper credits and further information
*/
#include <linux/sched.h>
#include <linux/sched/rt.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/spinlock.h>
#include <linux/kallsyms.h>
#include <linux/syscalls.h>
#include <linux/interrupt.h>
#include <linux/rbtree.h>
#include <linux/fs.h>
#include <linux/debug_locks.h>
#include "rtmutex_common.h"
static void printk_task(struct task_struct *p)
{
if (p)
printk("%16s:%5d [%p, %3d]", p->comm, task_pid_nr(p), p, p->prio);
else
printk("<none>");
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 38 | 92.68% | 2 | 66.67% |
| pavel emelianov | pavel emelianov | 3 | 7.32% | 1 | 33.33% |
| Total | 41 | 100.00% | 3 | 100.00% |
static void printk_lock(struct rt_mutex *lock, int print_owner)
{
if (lock->name)
printk(" [%p] {%s}\n",
lock, lock->name);
else
printk(" [%p] {%s:%d}\n",
lock, lock->file, lock->line);
if (print_owner && rt_mutex_owner(lock)) {
printk(".. ->owner: %p\n", lock->owner);
printk(".. held by: ");
printk_task(rt_mutex_owner(lock));
printk("\n");
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 85 | 100.00% | 2 | 100.00% |
| Total | 85 | 100.00% | 2 | 100.00% |
void rt_mutex_debug_task_free(struct task_struct *task)
{
DEBUG_LOCKS_WARN_ON(!RB_EMPTY_ROOT(&task->pi_waiters));
DEBUG_LOCKS_WARN_ON(task->pi_blocked_on);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 26 | 89.66% | 1 | 33.33% |
| thomas gleixner | thomas gleixner | 2 | 6.90% | 1 | 33.33% |
| peter zijlstra | peter zijlstra | 1 | 3.45% | 1 | 33.33% |
| Total | 29 | 100.00% | 3 | 100.00% |
/*
* We fill out the fields in the waiter to store the information about
* the deadlock. We print when we return. act_waiter can be NULL in
* case of a remove waiter operation.
*/
void debug_rt_mutex_deadlock(enum rtmutex_chainwalk chwalk,
struct rt_mutex_waiter *act_waiter,
struct rt_mutex *lock)
{
struct task_struct *task;
if (!debug_locks || chwalk == RT_MUTEX_FULL_CHAINWALK || !act_waiter)
return;
task = rt_mutex_owner(act_waiter->lock);
if (task && task != current) {
act_waiter->deadlock_task_pid = get_pid(task_pid(task));
act_waiter->deadlock_lock = lock;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 61 | 82.43% | 1 | 25.00% |
| thomas gleixner | thomas gleixner | 7 | 9.46% | 2 | 50.00% |
| pavel emelianov | pavel emelianov | 6 | 8.11% | 1 | 25.00% |
| Total | 74 | 100.00% | 4 | 100.00% |
void debug_rt_mutex_print_deadlock(struct rt_mutex_waiter *waiter)
{
struct task_struct *task;
if (!waiter->deadlock_lock || !debug_locks)
return;
rcu_read_lock();
task = pid_task(waiter->deadlock_task_pid, PIDTYPE_PID);
if (!task) {
rcu_read_unlock();
return;
}
if (!debug_locks_off()) {
rcu_read_unlock();
return;
}
printk("\n============================================\n");
printk( "[ BUG: circular locking deadlock detected! ]\n");
printk("%s\n", print_tainted());
printk( "--------------------------------------------\n");
printk("%s/%d is deadlocking current task %s/%d\n\n",
task->comm, task_pid_nr(task),
current->comm, task_pid_nr(current));
printk("\n1) %s/%d is trying to acquire this lock:\n",
current->comm, task_pid_nr(current));
printk_lock(waiter->lock, 1);
printk("\n2) %s/%d is blocked on this lock:\n",
task->comm, task_pid_nr(task));
printk_lock(waiter->deadlock_lock, 1);
debug_show_held_locks(current);
debug_show_held_locks(task);
printk("\n%s/%d's [blocked] stackdump:\n\n",
task->comm, task_pid_nr(task));
show_stack(task, NULL);
printk("\n%s/%d's [current] stackdump:\n\n",
current->comm, task_pid_nr(current));
dump_stack();
debug_show_all_locks();
rcu_read_unlock();
printk("[ turning off deadlock detection."
"Please report this trace. ]\n\n");
}
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| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 163 | 75.81% | 2 | 28.57% |
| pavel emelianov | pavel emelianov | 32 | 14.88% | 2 | 28.57% |
| thomas gleixner | thomas gleixner | 12 | 5.58% | 2 | 28.57% |
| ben hutchings | ben hutchings | 8 | 3.72% | 1 | 14.29% |
| Total | 215 | 100.00% | 7 | 100.00% |
void debug_rt_mutex_lock(struct rt_mutex *lock)
{
}
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| ingo molnar | ingo molnar | 9 | 100.00% | 2 | 100.00% |
| Total | 9 | 100.00% | 2 | 100.00% |
void debug_rt_mutex_unlock(struct rt_mutex *lock)
{
DEBUG_LOCKS_WARN_ON(rt_mutex_owner(lock) != current);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 19 | 95.00% | 1 | 50.00% |
| thomas gleixner | thomas gleixner | 1 | 5.00% | 1 | 50.00% |
| Total | 20 | 100.00% | 2 | 100.00% |
void
debug_rt_mutex_proxy_lock(struct rt_mutex *lock, struct task_struct *powner)
{
}
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| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 14 | 100.00% | 2 | 100.00% |
| Total | 14 | 100.00% | 2 | 100.00% |
void debug_rt_mutex_proxy_unlock(struct rt_mutex *lock)
{
DEBUG_LOCKS_WARN_ON(!rt_mutex_owner(lock));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 18 | 94.74% | 2 | 66.67% |
| thomas gleixner | thomas gleixner | 1 | 5.26% | 1 | 33.33% |
| Total | 19 | 100.00% | 3 | 100.00% |
void debug_rt_mutex_init_waiter(struct rt_mutex_waiter *waiter)
{
memset(waiter, 0x11, sizeof(*waiter));
waiter->deadlock_task_pid = NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 23 | 79.31% | 1 | 50.00% |
| pavel emelianov | pavel emelianov | 6 | 20.69% | 1 | 50.00% |
| Total | 29 | 100.00% | 2 | 100.00% |
void debug_rt_mutex_free_waiter(struct rt_mutex_waiter *waiter)
{
put_pid(waiter->deadlock_task_pid);
memset(waiter, 0x22, sizeof(*waiter));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 23 | 76.67% | 1 | 50.00% |
| pavel emelianov | pavel emelianov | 7 | 23.33% | 1 | 50.00% |
| Total | 30 | 100.00% | 2 | 100.00% |
void debug_rt_mutex_init(struct rt_mutex *lock, const char *name)
{
/*
* Make sure we are not reinitializing a held lock:
*/
debug_check_no_locks_freed((void *)lock, sizeof(*lock));
lock->name = name;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 37 | 100.00% | 2 | 100.00% |
| Total | 37 | 100.00% | 2 | 100.00% |
void
rt_mutex_deadlock_account_lock(struct rt_mutex *lock, struct task_struct *task)
{
}
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| ingo molnar | ingo molnar | 14 | 100.00% | 2 | 100.00% |
| Total | 14 | 100.00% | 2 | 100.00% |
void rt_mutex_deadlock_account_unlock(struct task_struct *task)
{
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 9 | 100.00% | 1 | 100.00% |
| Total | 9 | 100.00% | 1 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| ingo molnar | ingo molnar | 572 | 86.27% | 3 | 25.00% |
| pavel emelianov | pavel emelianov | 54 | 8.14% | 2 | 16.67% |
| thomas gleixner | thomas gleixner | 23 | 3.47% | 3 | 25.00% |
| ben hutchings | ben hutchings | 8 | 1.21% | 1 | 8.33% |
| clark williams | clark williams | 3 | 0.45% | 1 | 8.33% |
| peter zijlstra | peter zijlstra | 2 | 0.30% | 1 | 8.33% |
| paul gortmaker | paul gortmaker | 1 | 0.15% | 1 | 8.33% |
| Total | 663 | 100.00% | 12 | 100.00% |
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