------- Comment From [email protected] 2017-11-30 08:18 EDT------- Hello! I'm also trying to reproduce the problem on QEMU/KVM side but I haven't hit it so far.
My setup: [1] host: 8247-42L kernel: 4.13.0-16-generic guest: vanilla ubuntu-16.04.3-server-ppc64el.iso [2] host: 8335-GCA kernel: 4.13.0-17-generic guest: vanilla ubuntu-16.04.3-server-ppc64el.iso I tried several command line combinations, both KVM PR/HV modules and everything works flawlessly. After reading the logs (#comment 10) the following line called my attention: interrupt: 901 at plpar_hcall_norets+0x1c/0x28 Searching the code, I found pieces like: for_each_online_cpu(cpu) plpar_hcall_norets(...); So I'm thinking that *maybe* if one of your hw threads died and KVM alloc'ed that core it could trigger the issue. If that's the case, set the processor affinity may let the error consistent. In my case, all cores and threads looks good: $ sudo ppc64_cpu --smt=8 $ sudo ppc64_cpu --info Core 0: 0* 1* 2* 3* 4* 5* 6* 7* Core 1: 8* 9* 10* 11* 12* 13* 14* 15* Core 2: 16* 17* 18* 19* 20* 21* 22* 23* Core 3: 24* 25* 26* 27* 28* 29* 30* 31* Core 4: 32* 33* 34* 35* 36* 37* 38* 39* Core 5: 40* 41* 42* 43* 44* 45* 46* 47* Core 6: 48* 49* 50* 51* 52* 53* 54* 55* Core 7: 56* 57* 58* 59* 60* 61* 62* 63* Core 8: 64* 65* 66* 67* 68* 69* 70* 71* Core 9: 72* 73* 74* 75* 76* 77* 78* 79* Core 10: 80* 81* 82* 83* 84* 85* 86* 87* Core 11: 88* 89* 90* 91* 92* 93* 94* 95* Core 12: 96* 97* 98* 99* 100* 101* 102* 103* Core 13: 104* 105* 106* 107* 108* 109* 110* 111* Core 14: 112* 113* 114* 115* 116* 117* 118* 119* Core 15: 120* 121* 122* 123* 124* 125* 126* 127* Core 16: 128* 129* 130* 131* 132* 133* 134* 135* Core 17: 136* 137* 138* 139* 140* 141* 142* 143* Core 18: 144* 145* 146* 147* 148* 149* 150* 151* Core 19: 152* 153* 154* 155* 156* 157* 158* 159* Core 20: 160* 161* 162* 163* 164* 165* 166* 167* Core 21: 168* 169* 170* 171* 172* 173* 174* 175* Core 22: 176* 177* 178* 179* 180* 181* 182* 183* Core 23: 184* 185* 186* 187* 188* 189* 190* 191* Could you guys turn your core threads as well and give me the output? Thank you -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1733864 Title: kernel 4.10.0-40 is hanging with a CPU soft lock To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1733864/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
