Commit-ID: e894732989e345ea012de146c37d71dd7ed3575d
Gitweb: http://git.kernel.org/tip/e894732989e345ea012de146c37d71dd7ed3575d
Author: Frederic Weisbecker <fweisbec@xxxxxxxxx>
AuthorDate: Sun, 19 Apr 2009 16:18:16 +0200
Committer: Frederic Weisbecker <fweisbec@xxxxxxxxx>
CommitDate: Sun, 19 Apr 2009 16:18:16 +0200
tracing/core: Add current context on tracing recursion warning
In case of tracing recursion detection, we only get the stacktrace.
But the current context may be very useful to debug the issue.
This patch adds the softirq/hardirq/nmi context with the warning
using lockdep context display to have a familiar output.
v2: Use printk_once()
[ Impact: more information in tracing recursion ]
Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
---
kernel/trace/ring_buffer.c | 10 ++++++++++
1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index b421b0e..e315178 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -1495,6 +1495,16 @@ static int trace_recursive_lock(void)
if (unlikely(current->trace_recursion & (1 << level))) {
/* Disable all tracing before we do anything else */
tracing_off_permanent();
+
+ printk_once(KERN_WARNING "Tracing recursion: "
+ "[HC%u[%lu]:SC%u[%lu]:NMI[%lu]:HE%u:SE%u]\n",
+ current->hardirq_context,
+ hardirq_count() >> HARDIRQ_SHIFT,
+ current->softirq_context,
+ softirq_count() >> SOFTIRQ_SHIFT,
+ in_nmi(), current->hardirqs_enabled,
+ current->softirqs_enabled);
+
WARN_ON_ONCE(1);
return -1;
}
--
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