On Sun, 2015-12-06 at 08:28 -0700, Neil Mayhew wrote: > On 05/12/15 10:13 PM, Ben Hutchings wrote: > > We still need to discover the underlying devices of the bcache device, > > don't we? > > Technically, yes, although in my case the underlying device is a normal > sata disk and seems to have its module included anyway. Also, the bcache > module itself is included because I have to put it in > /etc/initramfs-tools/modules in order to be able to boot at all. I've > had successful crashdumps in the past, since I've been using bcache, but > I guess I should force one now to see if it still works. > > The generated initrd contains the following modules: > > kernel/crypto/async_tx/async_raid6_recov.ko > kernel/crypto/async_tx/async_xor.ko > kernel/crypto/async_tx/async_memcpy.ko > kernel/crypto/async_tx/async_tx.ko > kernel/crypto/async_tx/async_pq.ko > kernel/crypto/xor.ko > kernel/fs/jbd2/jbd2.ko > kernel/fs/fuse/fuse.ko > kernel/fs/mbcache.ko > kernel/fs/ext4/ext4.ko > kernel/drivers/md/dm-snapshot.ko > kernel/drivers/md/dm-raid.ko > kernel/drivers/md/md-mod.ko > kernel/drivers/md/bcache/bcache.ko > kernel/drivers/md/dm-mirror.ko > kernel/drivers/md/dm-mod.ko > kernel/drivers/md/dm-region-hash.ko > kernel/drivers/md/raid456.ko > kernel/drivers/md/dm-log.ko > kernel/drivers/md/dm-bufio.ko > kernel/drivers/scsi/sd_mod.ko > kernel/drivers/scsi/scsi_mod.ko > kernel/drivers/acpi/fan.ko > kernel/drivers/acpi/thermal.ko > kernel/drivers/thermal/thermal_sys.ko > kernel/lib/raid6/raid6_pq.ko > kernel/lib/crc16.ko > > In particular, it has sd_mod.ko which is the one referenced via by > /sys/block/sda/device/driver/module/
sd_mod is just a generic SCSI disk driver. I don't see any driver in there for the underlying host adapter (SCSI, ATA, or whatever). So I don't think that kdump initramfs can work. Have you tried it? > As you're probably aware, /sys/block/bcache0/device doesn't exist, and > /sys/block/bcache0/ is a symlink to /sys/devices/virtual/block/bcache0 No, I don't know. Does /sys/class/block/bcache0 contain references to the underlying devices it uses? > However, the main point of my patch is get past the serious problem of > an error in the kdump-tools postinst that wedges apt. Ben. -- Ben Hutchings Larkinson's Law: All laws are basically false.
signature.asc
Description: This is a digitally signed message part
