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DragonFly kernel List (threaded) for 2010-05
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Re: Kernel Dump when accessing second drive

From: Dylan Reinhold <dylan@xxxxxxxxxxxxxxxx>
Date: Sun, 16 May 2010 23:04:00 -0700

On 05/09/2010 12:15 AM, Dylan Reinhold wrote:
I added a second drive, to copy ~100GB's to my machine, but the kernel panics when I try and rsync the data.
The second drive is formated ext2 and mounted as readonly.

I walked the dump as much as I could (my thoughts are just a guess).

The dump is on leaf ~dylan/crash/*.11

Maybe the system is unable to get data from drive/controller.
Is the devstat structure mapped to the physical controller or the drive?
It seems that the kernel is unable to read from the memory mapped by that structure.

When its passed into getmicrouptime the memory seems to be gone.

(kgdb) f 9
#9 0xc02ff06c in getmicrouptime (tvp=0xa4) at /usr/src/sys/kern/kern_clock.c:972
972 tvp->tv_sec = gd->gd_time_seconds;
(kgdb) l 972
967 {
968 struct globaldata *gd = mycpu;
969 sysclock_t delta;
971 do {
972 tvp->tv_sec = gd->gd_time_seconds;
973 delta = gd->gd_hardclock.time - gd->gd_cpuclock_base;
974 } while (tvp->tv_sec != gd->gd_time_seconds);
976 if (delta >= sys_cputimer->freq) {
(kgdb) print tvp->tv_sec
Cannot access memory at address 0xa4
(kgdb) print &tvp->tv_sec
$1 = (time_t *) 0xa4


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