Created attachment 138576 [details] dmesg I don't remember what exactly I was doing (something in Firefox apparently) but my entire X session hang and I could only move the mouse pointer - everything else was static and didn't react to key/mouse presses. 4.15.13-300.fc27.x86_64 #1 SMP Mon Mar 26 19:06:57 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Created attachment 138790 [details] Another crash This is definitely a regression in kernel 4.15 because I've never had this issue before.
It is possible that kernel 4.15.9 didn't have this issue, so a regression window is quite small.
Created attachment 138797 [details] X.org.log Seemingly there's nothing interesting in the X.org log.
4.15 had a number of things added to it. One thing is using hugepages in ttm, which a lot of people have reported issues with. Try disabling CONFIG_SWIOTLB (not really needed on modern hw, afaik). Also nouveau's vm got a rewrite. Some fixes needed to be applied, I think they're all in 4.16, not as sure about 4.15.x. The start of your errors is [ 7661.417755] nouveau 0000:01:00.0: fifo: PBDMA0: 00040000 [PBENTRY] ch 7 [017f3cc000 firefox[19007]] subc 0 mthd 0000 data 00000000 [ 7661.417774] nouveau 0000:01:00.0: gr: TRAP ch 7 [017f3cc000 firefox[19007]] [ 7661.417780] nouveau 0000:01:00.0: gr: DISPATCH 80000002 [CLASS_SUBCH_MISMATCH] [ 7661.417793] nouveau 0000:01:00.0: fifo: PBDMA0: 00200000 [METHOD] ch 7 [017f3cc000 firefox[19007]] subc 0 mthd 000c data 88888888 which doesn't look extremely familiar. "FIFO is confused", after which everything goes downhill pretty fast.
(In reply to Ilia Mirkin from comment #4) > 4.15 had a number of things added to it. > > One thing is using hugepages in ttm, which a lot of people have reported > issues with. Try disabling CONFIG_SWIOTLB (not really needed on modern hw, > afaik). > > Also nouveau's vm got a rewrite. Some fixes needed to be applied, I think > they're all in 4.16, not as sure about 4.15.x. > I'd be glad to disable this option but I'm on Fedora 27 and I use the distro kernel, so I'm not sure how I can do that. Aren't you employed by RedHat/Fedora, Ilia? I guess it's in your power to raise this issue internally.
(In reply to Artem S. Tashkinov from comment #5) > (In reply to Ilia Mirkin from comment #4) > > 4.15 had a number of things added to it. > > > > One thing is using hugepages in ttm, which a lot of people have reported > > issues with. Try disabling CONFIG_SWIOTLB (not really needed on modern hw, > > afaik). > > > > Also nouveau's vm got a rewrite. Some fixes needed to be applied, I think > > they're all in 4.16, not as sure about 4.15.x. > > > > I'd be glad to disable this option but I'm on Fedora 27 and I use the distro > kernel, so I'm not sure how I can do that. Aren't you employed by > RedHat/Fedora, Ilia? I guess it's in your power to raise this issue > internally. I don't think so. Perhaps you know something I don't? Either way, this is the upstream bug system. If you have an issue with $distro, bring up the problem with $distro.
(In reply to Ilia Mirkin from comment #6) > > Either way, this is the upstream bug system. If you have an issue with > $distro, bring up the problem with $distro. Does "iommu=off" disable SWIOTLB?
This happens under 4.16 as well but a lot less frequently (maybe because I switched to Google Chrome to watch youtube): May 11 14:17:06 localhost kernel: nouveau 0000:01:00.0: fifo: PBDMA0: 00040000 [PBENTRY] ch 9 [017ed17000 firefox[14167]] subc 0 mthd 0000 data 00000000 May 11 14:17:06 localhost kernel: nouveau 0000:01:00.0: fifo: PBDMA0: 00040000 [PBENTRY] ch 9 [017ed17000 firefox[14167]] subc 0 mthd 0000 data 00000000 May 11 14:17:06 localhost kernel: nouveau 0000:01:00.0: fifo: PBDMA0: 00040000 [PBENTRY] ch 9 [017ed17000 firefox[14167]] subc 0 mthd 0000 data 00000000
Created attachment 139854 [details] dmesg again [14443.603553] kauditd_printk_skb: 51 callbacks suppressed
Probably related bug 99202
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