Dne 16.9.2015 v 02:58 Adam Nielsen napsal(a):
dmsetup reload backup --table "0 11720531968 error"
This one returns without error.
dmsetup suspend --noflush backup
or even better use --noflush --nolockfs
(if there was a mounted filesystem)
This one does not return to the command prompt. Running it through
strace shows this:
$ strace dmsetup suspend --noflush --nolockfs backup
...
munmap(0x7f9cdea45000, 4096) = 0
ioctl(3, DM_VERSION, 0x5644ae2ca0d0) = 0
ioctl(3, DM_DEV_SUSPEND
It always seems to freeze at DM_DEV_SUSPEND. This ioctl never seems to
return.
As with any other kernel frozen task - try to capture kernel stack trace.
If you properly configured sysrq trigger - easiest is to use:
'echo t >/proc/sysrq-trigger'
(Just make sure you have large enough kernel log buffer so lines are not lost)
Attach compressed trace - this should likely reveal where it blocks.
(I'll try to reproduce myself)
Zdenek
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