On 29/06/16 23:55, Scot Doyle wrote: > On Wed, 29 Jun 2016, Alexey Kardashevskiy wrote: >> On 29/06/16 18:31, Benjamin Herrenschmidt wrote: >>> On Wed, 2016-06-29 at 18:29 +1000, Benjamin Herrenschmidt wrote: >>>> On Wed, 2016-06-29 at 18:19 +1000, Alexey Kardashevskiy wrote: >>>>> This is rather a bugreport than actual revert but nevertheless. >>>>> >>>>> Since 27a4c827c34a I started noticing weird traces and quite often >>>>> I could not boot my test machine which is POWER8 box with AST video >>>>> or ATI video (video adapter type does not matter much although >>>>> is happens lot more often with the OpenPOWER machine which got >>>>> AST). >>>>> The system console is IPMI, not the actual video adapter. >>>>> >>>>> I bisected it to this: >>>>> >>>>> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/com >>>>> mi >>>>> t/?id=27a4c827c34ac4256a190cc9d24607f953c1c459 >>>>> >>>>> For some reason which I do not understand, in >>>>> cursor_timer_handler(), >>>>> ops->cur_blink_jiffies is zero. Why can this happen? What is a >>>>> proper >>>>> fix? Thanks. >>>> >>>> Rings a bell... do you have fbcon: initialize blink interval before >>>> calling fb_set_par (f235f664a8afabccf863a5dee4777d2d7b676fda) ? >>> >>> Also check if you have: >>> >>> "fbcon: set a default value to blink interval" >>> (upstream ID a1e533ec07d583d01349ef13c0c965b8633e1b91). >> >> >> Yes, both. The problem I see appears from v4.4 till the very recent >> upstream kernel which I am debugging now and which is v4.7-rc5. > > Hi Alexey, > > Have you tried commit 1b45996d2ebf "tty: vt: Fix soft lockup in > fbcon cursor blink timer." from the tty-linus branch of Greg's tty tree? This one does fix the problem, thanks! I'll run my reboot test for little longer and update if it fails. Tested-by: Alexey Kardashevskiy <aik@xxxxxxxxx> > > Or if that doesn't work, then perhaps > "fbcon: warn on invalid cursor blink intervals" from > http://thread.gmane.org/gmane.linux.kernel.stable/178675/focus=2226587 ? -- Alexey -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
