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lockdep: Print out additional debugging advice when we hit lockdep BUGs 

We occasionally get reports of these BUGs being hit, and the
stack trace doesn't necessarily always tell us what we need to
know about why we are hitting those limits.

If users start attaching /proc/lock_stats to reports we may have
more of a clue what's going on.

Signed-off-by: Dave Jones <davej@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20130423163403.GA12839@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Dave Jones 2013-04-23 12:34:03 -04:00 committed by Ingo Molnar
parent cc189d2513
commit 199e371f59
1 changed files with 5 additions and 0 deletions
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5
kernel/lockdep.c
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@ -411,6 +411,7 @@ static int save_trace(struct stack_trace *trace)
printk("BUG: MAX_STACK_TRACE_ENTRIES too low!\n");
printk("turning off the locking correctness validator.\n");
printk("Attach output of /proc/lock_stat to bug report\n");
dump_stack();
return 0;
@ -765,6 +766,7 @@ register_lock_class(struct lockdep_map *lock, unsigned int subclass, int force)
printk("BUG: MAX_LOCKDEP_KEYS too low!\n");
printk("turning off the locking correctness validator.\n");
printk("Attach output of /proc/lock_stat to bug report\n");
dump_stack();
return NULL;
}
@ -836,6 +838,7 @@ static struct lock_list *alloc_list_entry(void)
printk("BUG: MAX_LOCKDEP_ENTRIES too low!\n");
printk("turning off the locking correctness validator.\n");
printk("Attach output of /proc/lock_stat to bug report\n");
dump_stack();
return NULL;
}
@ -2050,6 +2053,7 @@ static inline int lookup_chain_cache(struct task_struct *curr,
printk("BUG: MAX_LOCKDEP_CHAINS too low!\n");
printk("turning off the locking correctness validator.\n");
printk("Attach output of /proc/lock_stat to bug report\n");
dump_stack();
return 0;
}
@ -3191,6 +3195,7 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass,
printk("BUG: MAX_LOCK_DEPTH too low, depth: %i max: %lu!\n",
curr->lockdep_depth, MAX_LOCK_DEPTH);
printk("turning off the locking correctness validator.\n");
printk("Attach output of /proc/lock_stat to bug report\n");
lockdep_print_held_locks(current);
debug_show_all_locks();