Public bug reported: 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 ** Affects: linux-riscv (Ubuntu) Importance: Undecided Status: New ** Attachment added: "boot.log.txt" https://bugs.launchpad.net/bugs/2039782/+attachment/5711125/+files/boot.log.txt -- 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: New 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
