Panic not dumping to USB.

[Conrad Meyer]

Hi Zaphod,

I don't think USB disks support polled I/O, which is needed for dump
devices.  As far as I know only classic disk devices (ATA, SCSI) work.

Best,
Conrad

On Fri, Aug 12, 2016 at 10:35 AM, Zaphod Beeblebrox <zbeeble at gmail.com> wrote:
> My swap spaces are too small to hold some of the panic's.  Either that, or
> this is also happening to them.  I added a 64G USB drive to the machine for
> the express purpose of crash dumps.  I formatted it with GPT and a label
> (so that it wouldn't get mixed up with SCSI drives).  The first partition
> has the type freebsd-swap and the label 'crash' ... so /dev/gpt/crash is my
> configured crash dump location.
>
> Luckily I have a serial console, so this is what's happening at crash-time:
>
> panic: dva_get_dsize_sync(): bad DVA 1573890:1587590144
> cpuid = 0
> KDB: stack backtrace:
> #0 0xffffffff80e55fed at kdb_backtrace+0x8d
> #1 0xffffffff80df76af at vpanic+0x1df
> #2 0xffffffff80df74d0 at vpanic+0
> #3 0xffffffff822b8b01 at dva_get_dsize_sync+0xb1
> #4 0xffffffff822b8d9e at bp_get_dsize+0x12e
> #5 0xffffffff8225a786 at dmu_tx_count_free+0x2f6
> #6 0xffffffff8225a334 at dmu_tx_hold_free+0x384
> #7 0xffffffff8223e9aa at dmu_free_long_range_impl+0xfa
> #8 0xffffffff8223e850 at dmu_free_long_range+0x60
> #9 0xffffffff82312dfe at zfs_rmnode+0xbe
> #10 0xffffffff822ed36f at zfs_zinactive+0xef
> #11 0xffffffff82339da7 at zfs_freebsd_reclaim+0x87
> #12 0xffffffff81619894 at VOP_RECLAIM_APV+0x174
> #13 0xffffffff80f15e39 at VOP_RECLAIM+0x39
> #14 0xffffffff80f0ff99 at vgonel+0x3e9
> #15 0xffffffff80f105e1 at vrecycle+0xb1
> #16 0xffffffff8233614e at zfs_inactive+0x1ae
> #17 0xffffffff82339d14 at zfs_freebsd_inactive+0x34
> Uptime: 1d5h2m19s
> Dumping 10472 out of 49114
> MB:..1%..11%SESC[0mESC[2;30;40mESC[0mESC[1m^@ESC[01;0
>
> ... obviously, that last bit after 11% is the console rebooting.  Note that
> dumping begins after Uptime.  Is that normal?  In this case, the 10472
> would fit on the 16G swap, but I'm not sure what the problem is.  It
> definitely fits on the 64G USB stick.
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