Progress display on multiple core dumps

[Matt Burke]

I've been doing a lot of panicing recently trying to track down a dtrace
problem, and have noticed that only the first call of doadump() shows a
progress display, resulting in uncertainty as to whether or not the dump is
happening, at least with a low amount of RAM dumping to a ramdisk (the
panicing machine is a VM)

This fixes it for me:

--- a/sys/amd64/amd64/minidump_machdep.c
+++ b/sys/amd64/amd64/minidump_machdep.c
@@ -226,6 +226,9 @@ minidumpsys(struct dumperinfo *di)
        struct minidumphdr mdhdr;

        retry_count = 0;
+       for (i = 0; i < 10; i++)
+               progress_track[i].visited = 0;
+
  retry:
        retry_count++;
        counter = 0;


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