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Crash in dbuf_evict_one with DTRACE_PROBE #6463

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Aug 9, 2017
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Crash in dbuf_evict_one with DTRACE_PROBE #6463

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58 changes: 39 additions & 19 deletions include/sys/trace_dbuf.h
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,10 @@
#include <linux/tracepoint.h>
#include <sys/types.h>

#ifndef TRACE_DBUF_MSG_MAX
#define TRACE_DBUF_MSG_MAX 512
#endif

/*
* Generic support for two argument tracepoints of the form:
*
Expand All @@ -42,8 +46,7 @@
*/

#define DBUF_TP_STRUCT_ENTRY \
__string(os_spa, \
spa_name(DB_DNODE(db)->dn_objset->os_spa)) \
__dynamic_array(char, os_spa, TRACE_DBUF_MSG_MAX) \
__field(uint64_t, ds_object) \
__field(uint64_t, db_object) \
__field(uint64_t, db_level) \
Expand All @@ -52,21 +55,38 @@
__field(uint64_t, db_size) \
__field(uint64_t, db_state) \
__field(int64_t, db_holds) \

#define DBUF_TP_FAST_ASSIGN \
__assign_str(os_spa, \
spa_name(DB_DNODE(db)->dn_objset->os_spa)); \
\
__entry->ds_object = db->db_objset->os_dsl_dataset ? \
db->db_objset->os_dsl_dataset->ds_object : 0; \
\
__entry->db_object = db->db.db_object; \
__entry->db_level = db->db_level; \
__entry->db_blkid = db->db_blkid; \
__entry->db_offset = db->db.db_offset; \
__entry->db_size = db->db.db_size; \
__entry->db_state = db->db_state; \
__entry->db_holds = refcount_count(&db->db_holds);
__dynamic_array(char, msg, TRACE_DBUF_MSG_MAX)

#define DBUF_TP_FAST_ASSIGN \
if (db != NULL) { \
__assign_str(os_spa, \
spa_name(DB_DNODE(db)->dn_objset->os_spa)); \
\
__entry->ds_object = db->db_objset->os_dsl_dataset ? \
db->db_objset->os_dsl_dataset->ds_object : 0; \
\
__entry->db_object = db->db.db_object; \
__entry->db_level = db->db_level; \
__entry->db_blkid = db->db_blkid; \
__entry->db_offset = db->db.db_offset; \
__entry->db_size = db->db.db_size; \
__entry->db_state = db->db_state; \
__entry->db_holds = refcount_count(&db->db_holds); \
snprintf(__get_str(msg), TRACE_DBUF_MSG_MAX, \
DBUF_TP_PRINTK_FMT, DBUF_TP_PRINTK_ARGS); \
} else { \
__assign_str(os_spa, "NULL") \
__entry->ds_object = 0; \
__entry->db_object = 0; \
__entry->db_level = 0; \
__entry->db_blkid = 0; \
__entry->db_offset = 0; \
__entry->db_size = 0; \
__entry->db_state = 0; \
__entry->db_holds = 0; \
snprintf(__get_str(msg), TRACE_DBUF_MSG_MAX, \
"dbuf { NULL }"); \
}

#define DBUF_TP_PRINTK_FMT \
"dbuf { spa \"%s\" objset %llu object %llu level %llu " \
Expand All @@ -84,7 +104,7 @@ DECLARE_EVENT_CLASS(zfs_dbuf_class,
TP_ARGS(db, zio),
TP_STRUCT__entry(DBUF_TP_STRUCT_ENTRY),
TP_fast_assign(DBUF_TP_FAST_ASSIGN),
TP_printk(DBUF_TP_PRINTK_FMT, DBUF_TP_PRINTK_ARGS)
TP_printk("%s", __get_str(msg))
);
/* END CSTYLED */

Expand All @@ -102,7 +122,7 @@ DECLARE_EVENT_CLASS(zfs_dbuf_evict_one_class,
TP_ARGS(db, mls),
TP_STRUCT__entry(DBUF_TP_STRUCT_ENTRY),
TP_fast_assign(DBUF_TP_FAST_ASSIGN),
TP_printk(DBUF_TP_PRINTK_FMT, DBUF_TP_PRINTK_ARGS)
TP_printk("%s", __get_str(msg))
);
/* END CSTYLED */

Expand Down