clone 777735 -1 reassign -1 qemu-system-x86 retile -1 setting unsupported timeout for i6300esb watchdog causes reset thanks
Am 13.02.2015 um 08:55 schrieb Peter Colberg: > On Fri, Feb 13, 2015 at 08:02:09AM +0100, Michael Biebl wrote: >> Am 13.02.2015 um 07:44 schrieb Michael Biebl: >>> I went on and looked what the watchdog package does. Interestingly, it >>> clamps any timeout value to 254s, thus not hitting this issue. >>> Apparently, i6300esb is able to deal with such a timeout. >>> >>> Peter, I therefore recommend you set >>> >>> ShutdownWatchdogSec=254s >>> >>> in /etc/systemd/system.conf as well for the time being. This should be >>> sufficient to workaround this issue for this buggy driver. >>> Setting 256s, does indeed trigger the issue, which leads to the >>> conclusion, that the driver is using a char to hold a time value (0-255). >> >> Actually, after a few more experiments, it turns out that for i6300esb, >> the safe max value in my qemu VM is 549s. Setting it to 550s triggers >> the reset. > > In the linux-3.16.7-ckt4 source the range of the timeout value for > the i6300esb is 1s < timeout < 2*1023s. In theory it should work > with the default shutdown timeout of 10min. > > For the ib700 the range is 0s <= timeout <= 30s, hence the error. > I decided to clone this bug and assign it to qemu. If the kernel is supposed to support such timeouts, this looks like a hardware/qemu issue to me then. While not supporting the timeout is one issue, the more important one is, that this causes a hw reset and this needs to be fixed. If this turns out to be indeed a kernel bug, please re-assign accordingly. I'll keep this bug report against systemd open for new. Haven't decided yet, if we apply some workarounds to systemd for this, like using a "safer" default like 4min on shutdown, assuming that because the watchdog package has been using 254 as max timeout in the past, drivers are at least tested with that limit. Michael -- Why is it that all of the instruments seeking intelligent life in the universe are pointed away from Earth?
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