> On 5 Feb 2018, at 7:21 PM, Peridot <email address hidden> wrote:
> 
> This is still an issue even with the bionic dailies. The easiest way
> (read: without recompiling kernels) I have found to get it to work is to
> disable IOMMU in your BIOS and add "iommu=soft" to the kernel booting
> options in grub.
> 
> linux can then detect everything properly (all cores) and I've had zero
> crashes. The only issue is that it's using software IOMMU.
> 
> Without these options you will either get crashes or hangs relating to
> the ACPI table (booting with acpi=off will only show a single core).
> Lots of AMD-Vi Logged events. and irq crashes.
> 
> I believe this is related to
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1671360 <https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1671360>

This particular bug is about interrupt storm from AMD GPIO driver.
Can you file a separate bug instead?

> 
> I'm on a Ryzen 1800X and Biostar B350GT5.
> 
> -- 
> You received this bug notification because you are subscribed to linux
> in Ubuntu.
> https://bugs.launchpad.net/bugs/1690085
> 
> Title:
>  Ryzen 1800X freeze - rcu_sched detected stalls on CPUs/tasks
> 
> Status in Linux:
>  Unknown
> Status in linux package in Ubuntu:
>  Confirmed
> 
> Bug description:
>  Hi,
> 
> 
>  We aregetting various kernel crash on a pretty new config.
>  We're using Ryzen 1800X CPU with X370 Gaming Pro Carbon MB (7A32V1) using latest BIOS available (1.52)
> 
>  We are running Ubuntu 17.04 (amd64), we've tried different kernel version, native one and releases from http://kernel.ubuntu.com/~kernel-ppa/mainline/ too.
>  Tested kernel version:
> 
>  native 17.04 kernel
>  4.10.15
> 
>  Issues are the same, we're getting random freeze on the machine.
> 
>  Here is kern.log entry when happening :
> 
>  May 10 22:41:56 dev2 kernel: [24366.186246] INFO: rcu_sched detected stalls on CPUs/tasks:
>  May 10 22:41:56 dev2 kernel: [24366.187618]     0-...: (1 GPs behind) idle=49b/1/0 softirq=28561/28563 fqs=913449
>  May 10 22:41:56 dev2 kernel: [24366.188977]     (detected by 12, t=1860207 jiffies, g=10001, c=10000, q=4656)
>  May 10 22:41:56 dev2 kernel: [24366.190344] Task dump for CPU 0:
>  May 10 22:41:56 dev2 kernel: [24366.190345] swapper/0       R  running task        0     0      0 0x00000008
>  May 10 22:41:56 dev2 kernel: [24366.190348] Call Trace:
>  May 10 22:41:56 dev2 kernel: [24366.190354]  ? native_safe_halt+0x6/0x10
>  May 10 22:41:56 dev2 kernel: [24366.190355]  ? default_idle+0x20/0xd0
>  May 10 22:41:56 dev2 kernel: [24366.190358]  ? arch_cpu_idle+0xf/0x20
>  May 10 22:41:56 dev2 kernel: [24366.190360]  ? default_idle_call+0x23/0x30
>  May 10 22:41:56 dev2 kernel: [24366.190362]  ? do_idle+0x16f/0x200
>  May 10 22:41:56 dev2 kernel: [24366.190364]  ? cpu_startup_entry+0x71/0x80
>  May 10 22:41:56 dev2 kernel: [24366.190366]  ? rest_init+0x77/0x80
>  May 10 22:41:56 dev2 kernel: [24366.190368]  ? start_kernel+0x464/0x485
>  May 10 22:41:56 dev2 kernel: [24366.190369]  ? early_idt_handler_array+0x120/0x120
>  May 10 22:41:56 dev2 kernel: [24366.190371]  ? x86_64_start_reservations+0x24/0x26
>  May 10 22:41:56 dev2 kernel: [24366.190372]  ? x86_64_start_kernel+0x14d/0x170
>  May 10 22:41:56 dev2 kernel: [24366.190373]  ? start_cpu+0x14/0x14
>  May 10 22:44:56 dev2 kernel: [24546.188093] INFO: rcu_sched detected stalls on CPUs/tasks:
>  May 10 22:44:56 dev2 kernel: [24546.189461]     0-...: (1 GPs behind) idle=49b/1/0 softirq=28561/28563 fqs=935027
>  May 10 22:44:56 dev2 kernel: [24546.190823]     (detected by 14, t=1905212 jiffies, g=10001, c=10000, q=4740)
>  May 10 22:44:56 dev2 kernel: [24546.192191] Task dump for CPU 0:
>  May 10 22:44:56 dev2 kernel: [24546.192192] swapper/0       R  running task        0     0      0 0x00000008
>  May 10 22:44:56 dev2 kernel: [24546.192195] Call Trace:
>  May 10 22:44:56 dev2 kernel: [24546.192199]  ? native_safe_halt+0x6/0x10
>  May 10 22:44:56 dev2 kernel: [24546.192201]  ? default_idle+0x20/0xd0
>  May 10 22:44:56 dev2 kernel: [24546.192203]  ? arch_cpu_idle+0xf/0x20
>  May 10 22:44:56 dev2 kernel: [24546.192204]  ? default_idle_call+0x23/0x30
>  May 10 22:44:56 dev2 kernel: [24546.192206]  ? do_idle+0x16f/0x200
>  May 10 22:44:56 dev2 kernel: [24546.192208]  ? cpu_startup_entry+0x71/0x80
>  May 10 22:44:56 dev2 kernel: [24546.192210]  ? rest_init+0x77/0x80
>  May 10 22:44:56 dev2 kernel: [24546.192211]  ? start_kernel+0x464/0x485
>  May 10 22:44:56 dev2 kernel: [24546.192213]  ? early_idt_handler_array+0x120/0x120
>  May 10 22:44:56 dev2 kernel: [24546.192214]  ? x86_64_start_reservations+0x24/0x26
>  May 10 22:44:56 dev2 kernel: [24546.192215]  ? x86_64_start_kernel+0x14d/0x170
>  May 10 22:44:56 dev2 kernel: [24546.192217]  ? start_cpu+0x14/0x14
> 
>  Depending on the kernel version, we've got NMI watchdog errors related to CPU stuck (mentioning the CPU core id, which is random).
>  Crash is happening randomly, but in general after some hours (3-4h).
> 
>  Now, we've installed kernel 4.11.0-041100-generic #201705041534 this morning and waiting for crash...
>  For now, the machine is not "used", at least, it's not CPU stressed...
> 
> 
>  Thanks
>  --- 
>  ApportVersion: 2.20.4-0ubuntu4
>  Architecture: amd64
>  DistroRelease: Ubuntu 17.04
>  InstallationDate: Installed on 2017-05-09 (1 days ago)
>  InstallationMedia: Ubuntu-Server 17.04 "Zesty Zapus" - Release amd64 (20170412)
>  Package: linux (not installed)
>  ProcEnviron:
>   TERM=xterm-256color
>   PATH=(custom, no user)
>   XDG_RUNTIME_DIR=<set>
>   LANG=fr_FR.UTF-8
>   SHELL=/bin/bash
>  Tags:  zesty
>  Uname: Linux 4.11.0-041100-generic x86_64
>  UnreportableReason: The running kernel is not an Ubuntu kernel
>  UpgradeStatus: No upgrade log present (probably fresh install)
>  UserGroups:
> 
>  _MarkForUpload: True
> 
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