This patch fixes a deadlock that has been reported by three different users on recent kernels. The problem exists on mainline kernels since 2.6.18. It is included in linux-2.6.22-rc1.
JFS: Fix race waking up jfsIO kernel thread It's possible for a journal I/O request to be added to the log_redrive queue and the jfsIO thread to be awakened after the thread releases log_redrive_lock but before it sets its state to TASK_INTERRUPTIBLE. The jfsIO thread should set the state before giving up the spinlock, so the waking thread will really wake it. Signed-off-by: Dave Kleikamp <[EMAIL PROTECTED]> diff -Nurp linux-2.6.21.1/fs/jfs/jfs_logmgr.c linux/fs/jfs/jfs_logmgr.c --- linux-2.6.21.1/fs/jfs/jfs_logmgr.c 2007-04-27 16:49:26.000000000 -0500 +++ linux/fs/jfs/jfs_logmgr.c 2007-05-15 22:39:31.000000000 -0500 @@ -2354,12 +2354,13 @@ int jfsIOWait(void *arg) lbmStartIO(bp); spin_lock_irq(&log_redrive_lock); } - spin_unlock_irq(&log_redrive_lock); if (freezing(current)) { + spin_unlock_irq(&log_redrive_lock); refrigerator(); } else { set_current_state(TASK_INTERRUPTIBLE); + spin_unlock_irq(&log_redrive_lock); schedule(); current->state = TASK_RUNNING; } -- David Kleikamp IBM Linux Technology Center - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/