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kernel/rtmutex-debug.c
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/* * 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 */ |
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#include <linux/sched.h> #include <linux/delay.h> |
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#include <linux/export.h> |
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#include <linux/spinlock.h> #include <linux/kallsyms.h> #include <linux/syscalls.h> #include <linux/interrupt.h> #include <linux/plist.h> #include <linux/fs.h> |
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#include <linux/debug_locks.h> |
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#include "rtmutex_common.h" |
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static void printk_task(struct task_struct *p) |
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{ if (p) |
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printk("%16s:%5d [%p, %3d]", p->comm, task_pid_nr(p), p, p->prio); |
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else printk("<none>"); } |
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static void printk_lock(struct rt_mutex *lock, int print_owner) { if (lock->name) printk(" [%p] {%s} ", lock, lock->name); else printk(" [%p] {%s:%d} ", lock, lock->file, lock->line); if (print_owner && rt_mutex_owner(lock)) { printk(".. ->owner: %p ", lock->owner); printk(".. held by: "); printk_task(rt_mutex_owner(lock)); printk(" "); } |
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} void rt_mutex_debug_task_free(struct task_struct *task) { |
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DEBUG_LOCKS_WARN_ON(!plist_head_empty(&task->pi_waiters)); DEBUG_LOCKS_WARN_ON(task->pi_blocked_on); |
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} /* * 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(int detect, struct rt_mutex_waiter *act_waiter, struct rt_mutex *lock) { struct task_struct *task; |
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if (!debug_locks || detect || !act_waiter) |
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return; task = rt_mutex_owner(act_waiter->lock); if (task && task != current) { |
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act_waiter->deadlock_task_pid = get_pid(task_pid(task)); |
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act_waiter->deadlock_lock = lock; } } void debug_rt_mutex_print_deadlock(struct rt_mutex_waiter *waiter) { struct task_struct *task; |
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if (!waiter->deadlock_lock || !debug_locks) |
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return; |
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rcu_read_lock(); task = pid_task(waiter->deadlock_task_pid, PIDTYPE_PID); if (!task) { rcu_read_unlock(); |
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return; |
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} |
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if (!debug_locks_off()) { rcu_read_unlock(); |
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return; |
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} |
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printk(" ============================================ "); printk( "[ BUG: circular locking deadlock detected! ] "); |
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printk("%s ", print_tainted()); |
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printk( "-------------------------------------------- "); printk("%s/%d is deadlocking current task %s/%d ", |
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task->comm, task_pid_nr(task), current->comm, task_pid_nr(current)); |
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printk(" 1) %s/%d is trying to acquire this lock: ", |
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current->comm, task_pid_nr(current)); |
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printk_lock(waiter->lock, 1); |
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printk(" 2) %s/%d is blocked on this lock: ", task->comm, task_pid_nr(task)); |
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printk_lock(waiter->deadlock_lock, 1); |
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debug_show_held_locks(current); debug_show_held_locks(task); |
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printk(" %s/%d's [blocked] stackdump: ", task->comm, task_pid_nr(task)); |
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show_stack(task, NULL); printk(" %s/%d's [current] stackdump: ", |
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current->comm, task_pid_nr(current)); |
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dump_stack(); |
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debug_show_all_locks(); |
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rcu_read_unlock(); |
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printk("[ turning off deadlock detection." "Please report this trace. ] "); |
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} |
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void debug_rt_mutex_lock(struct rt_mutex *lock) |
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{ |
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} void debug_rt_mutex_unlock(struct rt_mutex *lock) { |
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DEBUG_LOCKS_WARN_ON(rt_mutex_owner(lock) != current); |
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} |
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void debug_rt_mutex_proxy_lock(struct rt_mutex *lock, struct task_struct *powner) |
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{ |
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} void debug_rt_mutex_proxy_unlock(struct rt_mutex *lock) { |
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DEBUG_LOCKS_WARN_ON(!rt_mutex_owner(lock)); |
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} void debug_rt_mutex_init_waiter(struct rt_mutex_waiter *waiter) { memset(waiter, 0x11, sizeof(*waiter)); plist_node_init(&waiter->list_entry, MAX_PRIO); plist_node_init(&waiter->pi_list_entry, MAX_PRIO); |
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waiter->deadlock_task_pid = NULL; |
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} void debug_rt_mutex_free_waiter(struct rt_mutex_waiter *waiter) { |
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put_pid(waiter->deadlock_task_pid); |
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DEBUG_LOCKS_WARN_ON(!plist_node_empty(&waiter->list_entry)); DEBUG_LOCKS_WARN_ON(!plist_node_empty(&waiter->pi_list_entry)); |
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memset(waiter, 0x22, sizeof(*waiter)); } void debug_rt_mutex_init(struct rt_mutex *lock, const char *name) { |
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/* * Make sure we are not reinitializing a held lock: */ debug_check_no_locks_freed((void *)lock, sizeof(*lock)); lock->name = name; |
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} |
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void rt_mutex_deadlock_account_lock(struct rt_mutex *lock, struct task_struct *task) |
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{ } void rt_mutex_deadlock_account_unlock(struct task_struct *task) { } |