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[05:31:54] <dillona> Is there anything special to do to get Illumos running under KVM on CentOS 7?
[05:32:07] <dillona> Specifically I’m trying omnios
[05:32:21] <dillona> But in the boot menu I have also tried a nightly BE that I built
[05:32:56] <dillona> More details: I had this machine working under VirtualBox on Windows. I’ve moved the image over to another host with more memory but using QEMU/KVM instead of vbox
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[05:38:19] <Eimann> I don't see a reason why it shouldn't work right away
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[05:40:46] <dillona> Yeah I was hoping so
[05:40:55] <dillona> A few different screens flash by extremely quickly
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[05:41:02] <dillona> It doesn’t look like there is serial output
[05:41:13] <dillona> Maybe is there some way to turn that on from grub?
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[05:42:43] <Eimann> do you have any special cpu/sata settings applied?
[05:43:15] <Eimann> do you use libvirt or just quemu_kvm -image blah -etc ...?
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[05:45:23] <dillona> Using the virt-manager gui
[05:45:34] <dillona> I do not know of any special CPU settings
[05:46:37] <rmustacc> dillona: Sounds like something's panicking. If you can append -kd to the boot options, that'll drop you into the kernel debugger.
[05:47:14] <dillona> That did appear to drop me in kmdb
[05:47:58] <rmustacc> Yeah. So if you use ':c' you'll continue.
[05:48:07] <rmustacc> Then you'll likely get some kind of stack backtrace where it blows up.
[05:48:26] <rmustacc> So we can figure out where it's dying.
[05:48:39] <dillona> okay score! Now I can read the messages that were scrolling by
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[05:49:14] <rmustacc> Yeah, it'll trap you back into kmdb when you panic.
[05:49:18] <dillona> spa_import_rootpool error 5 seems to be the offending line
[05:50:12] <dillona> “Cannot read the pool label from /pci@0,0/pci-ide@1,1/ide@0/cmdk@0,0:a
[05:50:23] <rmustacc> If you run '$C', that'll give you the full stack.
[05:50:25] <rmustacc> Aha.
[05:50:29] <rmustacc> This sounds familiar.
[05:50:38] <rmustacc> LeftWing: Weren't you debugging something like this just the other day?
[05:51:05] <rmustacc> I think for some reason some part of the grub logic for some reason encodes the /devices path or osmething like that IIRC.
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[05:55:29] <Eimann> I'm just 10 minutes away and rmustacc turns up ... :D
[05:55:45] * Eimann didn't thought about the kernel debugger anyway
[05:56:34] <dillona> rmustacc has indeed been very helpful recently when I’ve been getting into Illumos
[05:56:41] <Eimann> :)
[05:57:06] <npx> rmustac is the #illumos helpfulness MVP tbh
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[06:03:07] <dillona> And both the OI and OmniOS CDs panic :/
[06:04:46] <rmustacc> Really, they panic?!
[06:04:50] <rmustacc> That's odd.
[06:05:11] <rmustacc> We run illumos on illumos KVM.
[06:05:12] <dillona> Worse actually
[06:05:16] <dillona> They panic sometimes
[06:05:20] <rmustacc> Definitely did test it in the past, but I haven't done Linux KVM in a while.
[06:05:21] <rmustacc> Ugh.
[06:05:24] <dillona> And other times the keyboard doesn’t work(?)
[06:05:30] <rmustacc> And I guess it's before the dump device is set up?
[06:05:54] <dillona> Yes however I was able to do the same -k thing
[06:06:49] <dillona> There’s a few ahci calls then _cmntrap, trap, and die
[06:07:12] <dillona> Is there a way to get previous console output
[06:07:22] <dillona> Like scroll up to what the last thing printed was before kmdb took over
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[06:08:09] <rmustacc> ::msgbuf
[06:09:22] <rmustacc> Unfortunately it's been a while since I've debugged these particular failure modes.
[06:09:32] <rmustacc> But what I used to do in QEMU was rig up a serial console and use that as a ttya/ttyb.
[06:09:40] <rmustacc> And just always set the console to that, so I had that scrollback.
[06:09:42] <rmustacc> And could copy/paste
[06:10:39] <dillona> That seems like a reasonable path forward
[06:11:20] <rmustacc> I'm happy to help look at any panics here, just don't really have a Linux install sitting around I can run kvm on.
[06:11:36] <dillona> Looks like lots of ahci WARNINGs printed out and eventually trap in a null pointer dereference inside ahci
[06:11:50] <rmustacc> In ahci, that's really weird.
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[06:12:15] <rmustacc> Though I feel like most of the time most folks are either doing IDE or virtio there.
[06:12:22] <rmustacc> And there's less use of QEMU AHCI.
[06:12:24] <rmustacc> So who knows.
[06:12:37] <dillona> Thats very kind of you to offer to help. I may ask to take you up on that another day when I have a decent debugging setup (for example with the serial ports)
[06:12:45] <dillona> Yeah I’m wondering where AHCI is coming into play
[06:12:52] <dillona> I know I set the disk and nic as virtio
[06:12:56] <dillona> The CD drive maybe?
[06:13:13] <dillona> Looks like the culprit. The CD drive is set to SATA
[06:14:27] <dillona> Switching it to IDE did seem to fix the issue
[06:14:31] <dillona> (fsvo fix)
[06:14:47] <dillona> Now the keyboard still isn’t working but I got it up with serial
[06:14:59] <rmustacc> If you have the chance, can you capture the stack trace and put that in a ticket?
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[06:15:45] <dillona> Yes I can do that
[06:15:56] <rmustacc> We should probably make sure that stuff works, as otherwise if it's not easy to try out illumos, that just makes it that much harder for folks.
[06:16:12] <rmustacc> Which is why I care about getting that stuff root caused, just don't have the energy / time to drive it.
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[06:17:45] <rmustacc> Oh, dillona, are you the person working on the elfdump fuzzing?
[06:17:53] <dillona> I am!
[06:18:03] <rmustacc> Did you figure out the elfdump internationalization?
[06:18:32] <dillona> No. Unfortunately I decided to take on this “moving my dev VM” project right as I’ve had a few late nights in a row at work
[06:18:43] <dillona> so I’ve not gotten to delve into it
[06:18:55] <rmustacc> No worries, just wanted to say when you're in a place where you're ready to start, feel free to ping me and I can give you some pointers to speed it up.
[06:19:04] <rmustacc> I've been down that rabbit hole before.
[06:19:32] <dillona> I most certainly appreciate it
[06:23:03] <dillona> rmustacc: anything else you want from the kmdb before I file the bug?
[06:24:26] <rmustacc> Is there anything else in ::stacks -m ahci beyond the one thread that's panicking?
[06:24:35] <rmustacc> Kind of hard to say without knowing too much more about the situation.
[06:25:49] <rmustacc> Maybe include the qemu version?
[06:27:37] <dillona> Just had a thought: I wonder if it still happens with only one core
[06:27:58] <dillona> Because there are two stacks with ahci stuff
[06:29:02] <rmustacc> Always possible, but probably not my first guess.
[06:29:28] <rmustacc> I would imagine that there's something in the virtual hardware that's throwing us off.
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[06:31:18] <dillona> Filed issue 7182
[06:32:33] <rmustacc> Thakns
[06:32:36] <rmustacc> *Thanks even
[06:34:13] <dillona> When turning down to one core, I’ve got three good boots in a row
[06:34:40] <dillona> four
[06:34:53] <rmustacc> That's unfortunately suspicious.
[06:35:26] <dillona> And it’s back when going back to four cores
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[06:39:51] <dillona> The console is being spammed with “^[[210z”
[06:39:54] <rmustacc> Well, once the bug is understood, I'm sure it'll be clear.
[06:40:03] <dillona> Is it upset about the emulation of scroll lock?
[06:41:06] <rmustacc> That I have no idea about. This is where I usually bother LeftWing.
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[06:55:39] <LeftWing> Ha ha ha.
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[11:59:16] <nikolam> VBox had an issue that has workaround on illumos hosts, to put 'set disable_smap=1' in /etc/system for VBox to work, May be that is somehow connected with illumos in KVM dying? (just an info in the dark), dillona
[12:01:26] <nikolam> can you try runnign OmniOS/OI on that Linux host, but inside VBox?
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[13:12:43] <estibi> In order to defragment a zpool do I need to recreate zpool from scratch and do zfs recv from a backup, or simply zfs destroy && zfs recv on the same pool? Is there any difference?
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[13:31:24] <dillona> nikolam: interesting idea. I'll try to try it tonight
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[14:39:08] <tomww> estibi: I would say, making the pool really really empty should give you comparable results to recreating the pool from scratch.
[14:40:19] <tomww> only if the stuff remaining on the emptied pool is fragmentes all over the disk, that part should stay a bit slow when being read with empty RAM cache.
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[16:00:47] <estibi> offtopic: what to choose 4x1TB 2.5" or 2x2TB 2.5" for mobile USB backups (single vdev pools) ?
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[16:09:12] <igork> s/live/life
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[16:22:24] <richlowe> alanc: you have no sense of adventure
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[16:58:30] <jbk> i'm still waiting for a giant systemd-based exploit to occurr
[16:58:53] <tsoome> hehe
[16:59:28] <jbk> well given the complexity, tight coupling, among other factors, i'm guessing it's only a matter of time
[16:59:40] <jbk> (they almost had one with some crap they were trying to pull w/ DNS)
[16:59:40] <tsoome> my experience is related to low-memory VM with systemd being killed by oomkiller. I was literally laughing my ass off;)
[16:59:57] <jbk> ahh oomkiller another 'brilliant' idea
[17:00:46] <tsoome> well, to be honest, it was really small vm with 512MB of ram
[17:01:12] <rmustacc> I more so live in fear of when the exploit comes to us and anyone who laughed at some else gets to deal with being laughed at instead.
[17:01:13] <ryao> tsoome: It shouldn't kill PID 1.
[17:01:30] <ryao> tsoome: Also, it is possible to disable the OOM killer by disabling overcommit.
[17:01:33] <tsoome> it did. centos 7.something
[17:01:53] <tsoome> it was install image btw with kickstart.
[17:02:18] <ryao> tsoome: Maybe it was running in a namespace/container-like thing.
[17:02:45] <tsoome> no, pure vmware vm just created and everything.
[17:02:58] <ryao> tsoome: Ouch. If you have the dmesg output, that would be interesting to see.
[17:03:03] <tsoome> kernel got loaded, first lines printed out and boom.
[17:03:27] <tsoome> na it did happen months ago.
[17:03:55] <ryao> tsoome: Maybe systemd crashed. That would do it.
[17:04:00] <tsoome> and @work, so no way to get stuff out from there;)
[17:04:33] <tsoome> no, there was clear message about oomkiller taking the action:)
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[17:08:14] <tsoome> hm, perhaps I should file an bugreport so systemd devs can integrate some sort of memory management as well;)
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[17:12:20] <richlowe> it's a somewhat novel approach to a microkernel.
[17:12:31] <richlowe> ("by accident", that is)
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[17:19:03] <tsoome> :D
[17:20:59] <sjorge> Not seen to many CVE for illumos... perhaps just due to not being a overly big target
[17:21:22] <sjorge> Then again I would imagine most Oracle Solaris stuff to have a chance of applying to illumos too
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[17:23:03] <tsoome> sure, but also that is changing in time - depending on how the things are addressed.
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[18:04:19] <richlowe> Oracle release so little information about their CVEs it's impossible to tell
[18:04:24] <richlowe> and also to do anything about them.
[18:04:35] <richlowe> danmcd's gets CVE#s when we do find stuff.
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[18:21:17] <sensille> daleg, rmustacc: you know some things about the 1000g driver, right? I'm having another go at the latest networking bug we encountered about 2 weeks ago, don't know if you remember
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[18:22:21] <rmustacc> sensille: Yeah, I do.
[18:22:29] <rmustacc> This was the TSO issue, right?
[18:23:35] <sensille> now, the next one, where packets got delayed up to a minute
[18:24:09] <sensille> I've examined the packet queue of the driver and the descriptor ring
[18:24:17] <rmustacc> This is on rx right?
[18:24:17] <sensille> they're out of sync
[18:24:20] <sensille> right
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[18:24:42] <rmustacc> So the card received them in the wrong order?
[18:25:02] <sensille> the dma addresses in the descriptors don't match those in the corresponding packets from the queue
[18:25:10] <sensille> out of order and with wrong len
[18:25:34] <rmustacc> Interesting.
[18:25:41] <rmustacc> That's certainly suspicious.
[18:25:49] <rmustacc> Does e1000g do any DMA loaning?
[18:26:19] <sensille> that was after a link loss
[18:26:32] <sensille> dma loaning?
[18:26:37] <rmustacc> Okay, so you went link down and then link up?
[18:26:41] <sensille> yes
[18:27:15] <sensille> the buffer addresses aren't fixed, it tries to send up the data without copying
[18:27:50] <rmustacc> So, by dma loaning, I basically mean creating a mblk from the DMA buffer and doing zero-copy.
[18:28:00] <rmustacc> I have a much longer description in the mac manual pages out for review.
[18:28:17] <sensille> yes, it does, but only for packets > 128 byte
[18:28:37] <rmustacc> Okay.
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[18:28:52] <sensille> the lists all look intact
[18:29:19] <sensille> and the current_desc is in sync with the head from the card
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[18:30:02] <sensille> after it loans a packet, it replaces it with a buffer from the free list
[18:30:28] <sensille> the reinitializes the descriptor dma address to the correct value
[18:30:47] <rmustacc> Right, that part is what I'd expect.
[18:30:57] <sensille> I suspect that if I send 2048 packet > 128 byte to the card, all is in sync again
[18:31:11] <sensille> but I haven't tried that yet
[18:31:42] <sensille> my problem: I can't find a code path where they can get out of sync
[18:33:00] <matejz> hola guys
[18:33:08] <matejz> is it possible to kill an iSCSI session
[18:33:10] <matejz> a certain one
[18:36:56] <rmustacc> sensille: Hmm. So you said that this only happens with a link up/down event?
[18:37:04] <rmustacc> Or a least is correlated?
[18:37:47] <sensille> we only observed the problems after a switch update
[18:38:08] <sensille> on 2% of the maschines
[18:38:26] <rmustacc> Hmm.
[18:38:50] <sensille> but I can't say for sure if the descriptors go slightly out of sync from time to time and resync by themselves
[18:39:13] <sensille> that's one thing I want to examine tomorrow
[18:39:16] <rmustacc> So here are the questions I'd have.
[18:39:24] <rmustacc> 1) Can we somehow trigger this into reproducing
[18:39:33] <rmustacc> 2) If we can do 1, does it happen if we only ever copy.
[18:40:45] <sensille> I haven't tried to reproduce it yet. I was hoping to find the bug first, that normally makes reproducing it much easier :)
[18:43:30] <rmustacc> Haha, yeah.
[18:43:37] <rmustacc> Well, I'll see if I can get some time to stare at e1000g.
[18:43:41] <sensille> we could also add an ASSERT to the copy path to verify the dma address
[18:44:02] <sensille> maybe it also happens during normal operation
[18:44:31] <rmustacc> Which e1000g part are you using?
[18:44:48] <rmustacc> Need to see if I have one in a lab I could run with those asserts or something.
[18:45:00] <sensille> 82574l
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[18:45:44] <rmustacc> Let me go check.
[18:46:18] <rmustacc> Looks like I do at least have one.
[18:47:25] <rmustacc> Though not sure I have that much time to help drive it at the moment, but I'll try and take a look at the code.
[18:49:16] <sensille> letting me explain the problem itself proves to be helpful quite often :)
[18:50:08] <sensille> I'll try to find out if it's chip-specific, as we have diverse hardware
[18:52:29] <rmustacc> I have a bunch as well.
[18:52:38] <rmustacc> Hopefully it's not chip-specific.
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[18:59:35] <rmustacc> sensille: Well, keep me posted with whatever you find.
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[19:02:59] <sensille> will do, thanks for having an open ear
[19:08:41] <rmustacc> Yeah, of course.
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[19:13:36] <rmustacc> Sigh, that truncate bug is a mess.
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[19:33:09] <richlowe> read that as "open bar"
[19:33:11] <richlowe> seems far more useful.
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[20:29:59] <danmcd> ping rmesta
[20:30:01] <danmcd> SHoot./
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[20:30:03] <danmcd> ping rmustacc
[20:30:12] <danmcd> Damn you autocomplete (and sorry rmesta )
[20:30:32] <danmcd> Actually, never mind rmustacc
[20:34:18] <gitomat> [illumos-gate] 7177 More null pointer dereferences in elfdump -- Dillon Amburgey <dillona at dillona dot com>
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[20:35:10] <thurloat> Trying to build illumos, and getting /usr/bin/find: stat() error ./usr/kernel: No such file or directory in the mail as the reported build failure. Am I missing a dependency? This didn't happen on my local test VM, but is happening on a new build server I set up.
[20:35:26] <rmustacc> danmcd: pong
[20:35:40] <rmustacc> thurloat: Are you running nightly or something else?
[20:36:16] <danmcd> rmustacc: Was going to ask about 7177, decided it was good enough and Just Pushed It (TM).
[20:36:32] <danmcd> Is dillona one of your summer students?
[20:36:40] <danmcd> Or new@joyent full-time?
[20:37:21] <rmustacc> No, he's a member of the community.
[20:37:30] <rmustacc> s/he/they're
[20:37:37] <rmustacc> (As I dunno)
[20:39:20] <thurloat> rmustacc: that is a difference. local test machine was omni bloody, this one is omni stable
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[20:40:24] <danmcd> You must open your public webrev servers on manta then (or I don't know how that works).
[20:40:26] <danmcd> Cool!
[20:41:49] <nahamu> any JPC customer can post things in Manta.
[20:41:59] <rmustacc> danmcd: There's no magic there. I just use a tool that basically does the logical rsync to your own account.
[20:42:00] <nahamu> (under their own space, that is.)
[20:42:12] <danmcd> Ack.
[20:42:27] <nahamu> manta-sync++
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[20:50:07] <thurloat> rmustacc: you think that change may have messed it up? otherwise, set up the same.
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[20:52:34] <thurloat> just noted something interesting: my build zone doesn't have access to those paths, however the global zone does.
[20:52:41] <thurloat> can you not do a build in a zone?
[20:53:46] <rmustacc> thurloat: So I build all the time in a zone. It'd help if you answered the question I asked about how you're building.
[20:53:53] <rmustacc> e.g. are you running nightly or something else.
[20:54:22] <thurloat> sorry, yes. nightly
[20:54:37] <rmustacc> Okay, can you make the nightly.log available?
[20:54:48] <thurloat> sure thing.
[20:58:04] <thurloat> lord it's massive, guess it's not going onto a pastebin.
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[21:56:43] <makruger> dillona: In order to get anything illumos running on a Linux KVM host, you'll probably need to disable the CPU feature named xsave.
[21:57:26] <makruger> And if running a GUI such as OpenIndiana, you'll need to remove the USB tablet (or the mouse won't work).
[21:57:59] <makruger> I'd recommend E1000 NIC and AC97 Audio as well.
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[22:08:33] <xenol> dillona: you can also use virtio-net as illumos has vioif driver
[22:08:42] <xenol> same goes for virtio block
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[22:31:30] <rmustacc> makruger: Why do you need to disable xsave?
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[22:32:06] <makruger> The kernel panics
[22:32:24] <rmustacc> Bug id?
[22:32:50] <makruger> I don't believe there is one as I never submitted a bug.
[22:33:20] <rmustacc> Okay.
[22:33:45] <rmustacc> Well, if we're having problems like that, folks here (or at least I) will generally try to help get that stuff fixed and understood.
[22:34:16] <makruger> All my testing was with OI, but I experienced the same with omniOS as well.
[22:34:29] <makruger> Sorry, guess I should have submitted a bug.
[22:34:47] <rmustacc> No worries, it's fine. Just that if we have persistent workarounds like that that we're telling folks, we should get them fixed.
[22:35:06] <makruger> Agreed:-)
[22:35:40] <rmustacc> I dogfood with smartos kvm when I need it, so these aren't things I personally see, but always happy to help folks debug.
[22:36:17] <rmustacc> So if you find yourself wanting at some point to reproduce it, ping me and I'm happy to help take a look.
[22:36:21] <makruger> I was running KVM on a Linux Mint host, but others I know with Debian based distros were seeing the same thing.
[22:37:05] <makruger> It's 100% reproducible (for me at least).
[22:37:32] <rmustacc> Maybe I'll have to do some nested virt in vmware or something. Just realistically going to be a while before I can get to it.
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[22:48:35] <rmustacc> makruger: Yeah, though that's not related to xsave yet.
[22:48:42] <rmustacc> Which is why I was asking about it.
[22:48:46] <makruger> ah
[22:49:02] <rmustacc> I was working with dillona on that when they filed it.
[22:49:08] <makruger> oh OK
[22:49:16] <makruger> I'll submit one as well then.
[22:49:24] <rmustacc> That's why I was curious about xsave and where we were blowing up and what the stack was.
[22:49:37] <rmustacc> Mind marking me as a watcher when you file it?
[22:49:43] <makruger> sure things
[22:50:28] <rmustacc> Thanks.
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