[Bug 1690085]
(In reply to Maxim Bakulin from comment #492) > Created attachment 280669 [details] > dmesg of freeze with 4.20.3 kernel and nomwait, rcu_nocbs, max_cstate applied > > some older info here: > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1690085/comments/566 > > I have three machines with new 2700x CPUs, and all three of them experience > freezes in xubuntu 18.04 after some time of work. I use compiling QEMU with > make -j16 in a loop to test for stability. > > I'm not sure it is the same bug, because I observe different behaviour: one > machine, that was compiling QEMU, froze during the night, and the one left > idle worked for 1 day. Another thing that SEEM to help is disabling SMT: The Processor errata lists two bugs (SMT-related) for Ryzen 1 and Ryzen 2 (1095 and 1109) with status "no fix planned". If you disable MWAIT but enable SMT, you are left with bug 1095: "Potential Violation of Read Ordering In Lock Operation In SMT (Simultaneous Multithreading) Mode". This can cause crashes. Not necessarily the cause of your crashes :-D # lsmsr -r 0xc0011020 warning: unknown MSR c0011020 unknown = 0x00068010 On my Ryzen 1600X bit 57 (no idea what it does) is 0. (But I have nosmt=force.) Linux kernel doesn't seem to touch that bit. Also, if you get "ACPI MWAIT C-state 0x0 not supported by HW (0x0)", mwait is not used by kernel. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1690085 Title: Ryzen 1800X freeze - rcu_sched detected stalls on CPUs/tasks To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1690085/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1690085]
Well, 4.18.19 froze after four days. 4.19.7 froze in 3½ hours. rcu_nocb_poll mem_encrypt=off nosmt=force CONFIG_RCU_NOCB_CPU=y CONFIG_PREEMPT_RCU=y [12572.931476] watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [(journald):18688] [12572.931509] watchdog: BUG: soft lockup - CPU#4 stuck for 22s! [amdgpu_cs:0:6535] [12600.931702] watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [(journald):18688] [12600.931736] watchdog: BUG: soft lockup - CPU#4 stuck for 22s! [amdgpu_cs:0:6535] -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1690085 Title: Ryzen 1800X freeze - rcu_sched detected stalls on CPUs/tasks To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1690085/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1690085]
With Ryzen 1600X + Radeon RX 550 + ASRock Taichi X370 I didn't have this bug until 4.18.20. 4.18.18 had 12 days uptime and 4.18.20 (and 4.19.6) maybe 6 hours. 4.18.19 now has 56 hours uptime. X just freezes (keyboard+mouse dead) and I have to press reset button. Likewise, if I am in console, freeze happens the same way; cursor stops blinking and I don't get any messages. I am booting with nosmt=force rcu_nocbs=0-5 mem_encrypt=off (also CONFIG_RCU_NOCB_CPU=Y ). Now, I don't feel like doing git-bisect (commits v4.18.19..v4.18.20),... Does someone have ideas as to what to try next? Anything suspicious in v4.18.20 commits? Some differences in dmesg 4.18.19..4.18.20: -smpboot: Allowing 16 CPUs, 10 hotplug CPUs +smpboot: Allowing 16 CPUs, 4 hotplug CPUs - node #0, CPUs:#1 #2 #3 #4 #5 + node #0, CPUs:#1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 smp: Brought up 1 node, 6 CPUs smpboot: Max logical packages: 3 -ACPI: (supports S0 S5) +ACPI: (supports S0 S3 S5) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1690085 Title: Ryzen 1800X freeze - rcu_sched detected stalls on CPUs/tasks To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1690085/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
