Messages in this thread | | | Date | Wed, 12 May 2004 22:19:16 -0700 | From | Andrew Morton <> | Subject | Re: odd problem with dd, kernels 2.6.5-mm6, 2.6.6 maybe others |
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Gene Heskett <gene.heskett@verizon.net> wrote: > > Greetings; > > I'm apparently having tape problems, and dd is one of the tools I use > to fix things. Unforch, when /dev/nst0 has reported an error during > the amcheck cycle, on 2 of the 4 tapes that it read just fine > yesterday, and then I do a rewind on one of them, and issue a 'dd > if=/dev/nst0 count=1' which *should* spit out the tape header > onscreen, what I'm actually getting is that nothing touches the drive > as far as moving the tape or changing the "Ready 1" display on the > face of the changer, but I do have a hung dd that can only be gotten > rid of by a reboot. > > It cannot be killed, not even with a -9. I do not know if this is a > new development in kernel history or not, but it sure is a PITA. > > Its been hung for about 20 minutes now. > > Is there anything that I as a big dummy can do to remedy this?
Please ensure that the kernel was built with CONFIG_KALLSYMS, wait for the hang, do:
echo 1 > /proc/sys/kernel/sysrq dmesg -c > /dev/null echo t > /proc/sysrq-trigger dmesg -s 1000000 > foo
and send foo. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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