tych0

I live in the southwest, didn't realize this data was available, so thank you. It would be super interesting to have a (heat) map of it all.

Hey Andrew, I've been an admirer of your work for a long time. Sounds awful, glad you are on the mend.

[disclaimer, maintainer here]

> Doesn't this require the environment to be owned by root? Doesn't it make more sense to leave things that are in /opt as root-owned anyway? (Or at least, change them back after running the installation as an unprivileged user.)

No, it doesn't require that, it just means your user-owned binary will be exec'd by root. But if you want the root -> user owned indirection, you can set `Exec=/etc/X11/xinit/Xsession`, which will exec your ~/.xsession as your user, and then you can keep a local install.

> Will any random greeter program just naturally pick up the contents of /usr/share/xsessions, then?

Ones that support x11 do, yes.

> So does it just ignore all your other dotfiles? Can I safely just try this out regardless of my usual WM/DE choices?

We try to read XDG_* things where relevant, e.g. themes and icons. But generally yes, once you point your xsession at qtile, we only use our config file.

> Hi Tycho. I was The Guy at LSS who tested positive for COVID about 12 hours after we sat next to each other at that Japanese restaurant in Vancouver the week before last. I really hope you didn't catch it. So far, to my knowledge, my "blast radius" is just me.

Hi Mike. So far so good for me.

> It looks like you were able to figure things out through some combination of /proc poking, code inspection, and LKML querying. Out of curiosity, would it be feasible for you to have tried enabling some of the kernel hacking options such as WQ_WATCHDOG or DETECT_HUNG_TASK? Do you think that would have sped up your investigation?

We do have these both enabled, and have alerts to log them in the fleet. I have found it very useful for saying "there's a bug", but not generally applicable in debugging it. However, we wouldn't catch these things without user reports if we didn't have those tools.

Something that might (?) be useful is something like lockdep when there's hung tasks. It wouldn't have helped in this case, since it was a bug in signals wakeup, but I e.g. in the xfs case I cited at the bottom maybe it would.

> Or am I misunderstanding you?

Oh, I see, you're suggesting exactly,

> (Another maybe-interesting thing would be to just delete that check.)

I agree.

> Couple of things: 1. Should prepare_to_wait_event check if the task is in PF_EXITING, and if so, refuse to wait unless a specific flag is provided? I'd be curious if you just add a kprobe to prepare_to_wait_event that checks for PF_EXITING, how many cases are valid?

I would argue they're all invalid if PF_EXITING is present. Maybe I should send a patch to WARN() and see how much I get yelled at.

> Shouldn't it wake up, even if in its in PF_EXITING, that would trigger as reassessment of the condition, and then the `__fatal_signal_pending` check would make it return -ERESTARTSYS.

No, because the signal doesn't get delivered by complete_signal(). wants_signal() returns false if PF_EXITING is set. (Another maybe-interesting thing would be to just delete that check.) Or am I misunderstanding you?

> Shouldn't it be "ShdPnd"

derp, fixed, thanks.

I think they definitely should not. I've considered sending a patch that adds a WARN() or some syzkaller test for it or something, especially now that I've seen it in other filesystems.

And at least in SBF/Alameda's case, they did, and you can google it. IIUC it was basic arbitrage, the hard part was figuring out how to interface with Japan's banks.

Maybe the guy is a bad dude, I don't have a horse in that race. But lots of trading strategies that have worked in the past are well known.

Use the freezer cgroup to freeze everything, then kill it all off however you like.

> Could it be that some Oracle employed contributors are using a different email when submitting pull requests?

Yes, and if you contribute from an e-mail address that Greg K-H's scripts don't understand, you get an e-mail from him asking you to disclose your employer if you're willing.

Some companies mandate you contribute from your corporate address, and it is impossible to contribute from some corporate e-mail accounts, since they don't allow SMTP access for use with git send-email. For example, my understanding is that this is the reason for the linux.ibm.com subdomain, though someone at IBM can probably elaborate.

LWN's numbers are probably pretty close to accurate, as I think most people disclose. I haven't read TFA, but I guess Oracle is counting only commits to kernel/+fs/+net/ or something like that.