@opvolger Thank you for confirming the issue.
The upstreaming of PCIe for the StarFive VisionFive 2 board is not finalized yet. The kernel team will revisit this issue once there is proper upstream support. They picked up what was available on the kernel list which brought us NVMe support for which I am grateful. -- 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/2039782 Title: Stalls on CPUs/tasks on VisionFive 2 with external GPU Status in linux-riscv package in Ubuntu: Confirmed Bug description: I am trying to install Ubuntu Mantic on the StarFive VisionFive 2 1.3B board using https://cdimage.ubuntu.com/releases/23.10/release/ubuntu-23.10-live- server-riscv64.img.gz I have connected an Nvidia GT710 graphics card to the NVMe connector and see rcu_sched stalls. I have not observed this behavior on StarFive VisionFive 2 1.3B boards without an external GPU. The U-Boot installed on SPI flash is https://launchpad.net/~ubuntu-risc-v-team/+archive/ubuntu/release/+files/u-boot-starfive_2023.09.22-next-5d2fae79c7d6-0ubuntu1~ppa5_riscv64.deb [ 93.102845] rcu: INFO: rcu_sched detected stalls on CPUs/tasks: [ 93.114452] rcu: 0-...!: (1 GPs behind) idle=c69c/1/0x4000000000000002 softirq=2431/2431 fqs=41 [ 93.128724] rcu: (detected by 2, t=15008 jiffies, g=4353, q=2369 ncpus=4) [ 93.140996] Task dump for CPU 0: [ 93.149549] task:swapper/0 state:R running task stack:0 pid:0 ppid:0 flags:0x00000000 [ 93.164907] Call Trace: [ 93.172715] [<ffffffff80ce749c>] __schedule+0x27a/0x82e [ 93.183385] rcu: rcu_sched kthread timer wakeup didn't happen for 14937 jiffies! g4353 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x200 [ 93.200202] rcu: Possible timer handling issue on cpu=0 timer-softirq=890 [ 93.212733] rcu: rcu_sched kthread starved for 14945 jiffies! g4353 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x200 ->cpu=0 [ 93.228777] rcu: Unless rcu_sched kthread gets sufficient CPU time, OOM is now expected behavior. [ 93.243573] rcu: RCU grace-period kthread stack dump: [ 93.254522] task:rcu_sched state:R stack:0 pid:15 ppid:2 flags:0x00000000 [ 93.268895] Call Trace: [ 93.277340] [<ffffffff80ce749c>] __schedule+0x27a/0x82e [ 93.288646] [<ffffffff80ce7a9e>] schedule+0x4e/0xde [ 93.299623] [<ffffffff80ced874>] schedule_timeout+0x8c/0x15e [ 93.311380] [<ffffffff800b0e26>] rcu_gp_fqs_loop+0x2fc/0x3d4 [ 93.323170] [<ffffffff800b3322>] rcu_gp_kthread+0x11a/0x142 [ 93.334901] [<ffffffff80044fe6>] kthread+0xc4/0xe4 [ 93.345833] [<ffffffff80003f82>] ret_from_fork+0xe/0x20 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-riscv/+bug/2039782/+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
