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xen-devel
RE: [Xen-devel] x86_64 eth0 e1000_clean_tx_irq tx hang
> This is against current x86_64 defconfig build:
>
> e1000: eth0: e1000_clean_tx_irq: Detected Tx Unit Hang
> Tx Queue <0>
> TDH <2b>
> TDT <31>
> next_to_use <31>
> next_to_clean <2b>
> buffer_info[next_to_clean]
> time_stamp <10004d5f2>
> next_to_watch <2d>
> jiffies <10004d7ce>
> next_to_watch.status <0>
>
> ... repeat until eventually ...
>
> NETDEV WATCHDOG: eth0: transmit timed out
>
> this is on simple scp to dom0 from external box. after a bit
> watchdog resets, and ping works, only to repeat itself when a
> try to scp again
Yep, this is the bug I warned y'all about at the summit, but you asked
for the code to be checked in anyway...
A bug shared is a bug fixed quicker? :-)
For us, this only manifests on x86_64, and arrived with the subarch xen
version of 2.6.12. Extensive inspection of the arch->subarch conversion
suggests that nothing should have changed, so this is likely a latent
bug being triggered by slight timing changes.
It sounds like it's rather easier for you to trigger than it was for us
-- we had to run xm-test several times to get it to happen. Happy
hunting, and good luck :-)
Ian
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