Showing error 1107

User: Jiri Slaby
Error type: Double Lock
Error type description: Some lock is locked twice unintentionally in a sequence
File location: fs/xfs/xfs_log.c
Line in file: 2430
Project: Linux Kernel
Project version: 2.6.28
Tools: Clang Static Analyzer (3.0)
Entered: 2012-04-17 12:29:30 UTC

Source: 

2400 * sleep.  We wait on the flush queue on the head iclog as that should be
2401 * the first iclog to complete flushing. Hence if all iclogs are syncing,
2402 * we will wait here and all new writes will sleep until a sync completes.
2403 *
2404 * The in-core logs are used in a circular fashion. They are not used
2405 * out-of-order even when an iclog past the head is free.
2406 *
2407 * return:
2408 *        * log_offset where xlog_write() can start writing into the in-core
2409 *                log's data space.
2410 *        * in-core log pointer to which xlog_write() should write.
2411 *        * boolean indicating this is a continued write to an in-core log.
2412 *                If this is the last write, then the in-core log's offset field
2413 *                needs to be incremented, depending on the amount of data which
2414 *                is copied.
2415 */
2416STATIC int
2417xlog_state_get_iclog_space(xlog_t          *log,
2418                           int                  len,
2419                           xlog_in_core_t **iclogp,
2420                           xlog_ticket_t  *ticket,
2421                           int                  *continued_write,
2422                           int                  *logoffsetp)
2423{
2424        int                  log_offset;
2425        xlog_rec_header_t *head;
2426        xlog_in_core_t          *iclog;
2427        int                  error;
2428
2429restart:
2430        spin_lock(&log->l_icloglock);
2431        if (XLOG_FORCED_SHUTDOWN(log)) {
2432                spin_unlock(&log->l_icloglock);
2433                return XFS_ERROR(EIO);
2434        }
2435
2436        iclog = log->l_iclog;
2437        if (iclog->ic_state != XLOG_STATE_ACTIVE) {
2438                xlog_trace_iclog(iclog, XLOG_TRACE_SLEEP_FLUSH);
2439                XFS_STATS_INC(xs_log_noiclogs);
2440
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