** Changed in: linux-riscv (Ubuntu)
Status: New => Confirmed
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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
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