• Steven Rostedt's avatar
    tracing: Fix ent_size in trace output · 12b5da34
    Steven Rostedt authored
    When reading the trace file, the records of each of the per_cpu buffers
    are examined to find the next event to print out. At the point of looking
    at the event, the size of the event is recorded. But if the first event is
    chosen, the other events in the other CPU buffers will reset the event size
    that is stored in the iterator descriptor, causing the event size passed to
    the output functions to be incorrect.
    
    In most cases this is not a problem, but for the case of stack traces, it
    is. With the change to the stack tracing to record a dynamic number of
    back traces, the output depends on the size of the entry instead of the
    fixed 8 back traces. When the entry size is not correct, the back traces
    would not be fully printed.
    
    Note, reading from the per-cpu trace files were not affected.
    Reported-by: default avatarThomas Gleixner <tglx@linutronix.de>
    Tested-by: default avatarThomas Gleixner <tglx@linutronix.de>
    Cc: stable@vger.kernel.org
    Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
    12b5da34
trace.c 114 KB