The workaround built successfully in my PPA: https://launchpad.net/~alexghiti/+archive/ubuntu/riscv/+sourcepub/13413205/+listing- archive-extra
I tested it successfully with the RISC-V live installer (where this problem was seen). I did not have time yet to work on the proper fix so I think we should go for this workaround: @xnox what do you think? Thanks -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-riscv in Ubuntu. https://bugs.launchpad.net/bugs/1967130 Title: rcu_sched detected stalls on CPUs/tasks Status in linux-riscv package in Ubuntu: New Bug description: When running the riscv64 live installer (https://cdimage.ubuntu.com/ubuntu-server/daily-live/20220330/jammy- live-server-riscv64.iso) on the SiFive Unmatched board we reproducibly see rcu_sched stalls related to accessing the UEFI runtime: Mar 30 11:50:47 ubuntu-server kernel: [ 1313.451647] rcu: INFO: rcu_sched detected stalls on CPUs/tasks: Mar 30 11:50:47 ubuntu-server kernel: [ 1313.451673] rcu: 3-...0: (3 GPs behind) idle=d03/1/0x4000000000000000 softirq=85648/85648 fqs=7326 Mar 30 11:50:47 ubuntu-server kernel: [ 1313.451698] (detected by 0, t=15002 jiffies, g=155853, q=1286) Mar 30 11:50:47 ubuntu-server kernel: [ 1313.451712] Task dump for CPU 3: Mar 30 11:50:47 ubuntu-server kernel: [ 1313.451720] task:kworker/u8:1 state:R running task stack: 0 pid: 3715 ppid: 2 flags:0x00000008 Mar 30 11:50:47 ubuntu-server kernel: [ 1313.451750] Workqueue: efi_rts_wq efi_call_rts Mar 30 11:50:47 ubuntu-server kernel: [ 1313.451777] Call Trace: Mar 30 11:50:47 ubuntu-server kernel: [ 1313.451782] [<ffffffff809be1b6>] __schedule+0x226/0x644 uname -a: Linux ubuntu-server 5.15.0-1004-generic #4-Ubuntu SMP Wed Feb 9 18:17:33 UTC 2022 riscv64 riscv64 riscv64 GNU/Linux --- ProblemType: Bug Architecture: riscv64 DistroRelease: Ubuntu 22.04 Package: linux-image-generic 5.15.0.1004.4 PackageArchitecture: riscv64 ProcEnviron: TERM=vt220 PATH=(custom, no user) LANG=C.UTF-8 Uname: Linux 5.15.0-1004-generic riscv64 UserGroups: N/A _MarkForUpload: True To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-riscv/+bug/1967130/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
