https://gitlab.com/qemu-project/qemu/-/issues/2006
when i migrate the VM from one host to another, it fails and give messages:
[ 584.109502] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 584.109534] rcu: 1-...!: (0 ticks this GP) idle=1408/0/0x0 softirq=8428/8428 fqs=0 (false positive?)
[ 584.109556] (detected by 0, t=5252 jiffies, g=2953, q=74 ncpus=2)
[ 584.109561] Sending NMI from CPU 0 to CPUs 1:
[ 584.109587] NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xb/0x10
[ 584.110564] rcu: rcu_preempt kthread timer wakeup didn't happen for 5251 jiffies! g2953 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
[ 584.110585] rcu: Possible timer handling issue on cpu=1 timer-softirq=8006
[ 584.110597] rcu: rcu_preempt kthread starved for 5252 jiffies! g2953 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
[ 584.110614] rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
[ 584.110645] rcu: RCU grace-period kthread stack dump:
[ 584.110658] task:rcu_preempt state:I stack:0 pid:15 ppid:2 flags:0x00004000
[ 584.110667] Call Trace:
[ 584.110672] <TASK>
[ 584.110688] __schedule+0x351/0xa20
[ 584.110699] ? rcu_gp_cleanup+0x480/0x480
[ 584.110704] schedule+0x5d/0xe0
[ 584.110705] schedule_timeout+0x94/0x150
[ 584.110709] ? __bpf_trace_tick_stop+0x10/0x10
[ 584.110714] rcu_gp_fqs_loop+0x141/0x4c0
[ 584.110717] rcu_gp_kthread+0xd0/0x190
[ 584.110720] kthread+0xe9/0x110
[ 584.110725] ? kthread_complete_and_exit+0x20/0x20
[ 584.110728] ret_from_fork+0x22/0x30
[ 584.110735] </TASK>
[ 584.110736] rcu: Stack dump where RCU GP kthread last ran:
[ 584.110747] Sending NMI from CPU 0 to CPUs 1:
[ 584.110757] NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xb/0x10
Host environment
- Operating system: Proxmox 8.1(Debian 12.2)
- OS/kernel version: Linux pve0.wx.xxxx.com 6.5.11-4-pve #1 SMP PREEMPT_DYNAMIC PMX 6.5.11-4 (2023-11-20T10:19Z) x86_64 GNU/Linux
- Architecture: x86_64
- QEMU flavor: pve-qemu-kvm
- QEMU version: 8.1.2-4
- QEMU command line:
- hardware: Dell R630, Xeon CPU E5-2686, H330 Raid
when i migrate the VM from one host to another, it fails and give messages:
[ 584.109502] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 584.109534] rcu: 1-...!: (0 ticks this GP) idle=1408/0/0x0 softirq=8428/8428 fqs=0 (false positive?)
[ 584.109556] (detected by 0, t=5252 jiffies, g=2953, q=74 ncpus=2)
[ 584.109561] Sending NMI from CPU 0 to CPUs 1:
[ 584.109587] NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xb/0x10
[ 584.110564] rcu: rcu_preempt kthread timer wakeup didn't happen for 5251 jiffies! g2953 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
[ 584.110585] rcu: Possible timer handling issue on cpu=1 timer-softirq=8006
[ 584.110597] rcu: rcu_preempt kthread starved for 5252 jiffies! g2953 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
[ 584.110614] rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
[ 584.110645] rcu: RCU grace-period kthread stack dump:
[ 584.110658] task:rcu_preempt state:I stack:0 pid:15 ppid:2 flags:0x00004000
[ 584.110667] Call Trace:
[ 584.110672] <TASK>
[ 584.110688] __schedule+0x351/0xa20
[ 584.110699] ? rcu_gp_cleanup+0x480/0x480
[ 584.110704] schedule+0x5d/0xe0
[ 584.110705] schedule_timeout+0x94/0x150
[ 584.110709] ? __bpf_trace_tick_stop+0x10/0x10
[ 584.110714] rcu_gp_fqs_loop+0x141/0x4c0
[ 584.110717] rcu_gp_kthread+0xd0/0x190
[ 584.110720] kthread+0xe9/0x110
[ 584.110725] ? kthread_complete_and_exit+0x20/0x20
[ 584.110728] ret_from_fork+0x22/0x30
[ 584.110735] </TASK>
[ 584.110736] rcu: Stack dump where RCU GP kthread last ran:
[ 584.110747] Sending NMI from CPU 0 to CPUs 1:
[ 584.110757] NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xb/0x10
Last edited:
