kvm fpu warning on 4.14.89

Jan Kiszka jan.kiszka at siemens.com
Fri Mar 1 15:58:48 CET 2019


On 01.03.19 15:21, cagnulein wrote:
> Hi, with the last git the warning disappear, thanks.
> Now I would like to submit a new issue : with the last git and with the 4.14.89 
> also, if I run latency-test without the kvm guest on, everything works fine.
> If I run latency-test with the kvm guest on the system hangs! The entire system 
> not only the guest.
> This doesn't happen with the 4.9.146.
> Any hints to debug it?

Hmm, this will be more complicated in fact. I need to try reproducing that in 
KVM (nested setup) because that allows insights to be obtained more easily.

Jan

> Thanks in advance
> 
> Il ven 1 mar 2019, 11:30 cagnulein <cagnulein at gmail.com 
> <mailto:cagnulein at gmail.com>> ha scritto:
> 
>     Yes qemu on a xenomai kernel (host device). My guest is a windows 10 2019.
> 
>     I'm already compiling the last git. I will let you know.
>     Thanks
> 
>     Il ven 1 mar 2019, 11:24 Jan Kiszka <jan.kiszka at siemens.com
>     <mailto:jan.kiszka at siemens.com>> ha scritto:
> 
>         On 01.03.19 10:35, cagnulein via Xenomai wrote:
>          > I’m testing the 4.14.89 ipipe (i was usually using 4.9.146) and i’ve
>         got a
>          > deterministic warning every time i start qemu. Is it already known?
>          >
> 
>         Thanks for reporting. I suppose this wasn't tested in a while.
> 
>         Just to be sure: You are starting QEMU/KVM *on* a Xenomai kernel, and *not*
>         Xenomai as KVM guest, right?
> 
>         Could you also give latest https://gitlab.denx.de/Xenomai/ipipe-x86/ a
>         try, if
>         something happened to have changed?
> 
>         I will try to reproduce ASAP.
> 
>         Jan
> 
>          > Thanks
>          >
>          > R.
>          >
>          >
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.078798] WARNING: CPU: 0 PID:
>         1154
>          > at ./arch/x86/include/asm/fpu/internal.h:617 __kernel_fpu_end+0x8b/0xa0
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.078802] Modules linked in:
>          > hid_generic usbhid hid xt_CHECKSUM iptable_mangle ipt_MASQUERADE
>          > nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4
>          > nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4
>          > xt_tcpudp tun ebtable_filter ebtables ip6table_filter ip6_tables
>          > iptable_filter bridge stp llc intel_rapl x86_pkg_temp_thermal coretemp
>          > kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel
>          > pcbc i2c_designware_platform i2c_designware_core nls_ascii nls_cp437 vfat
>          > fat aesni_intel aes_x86_64 crypto_simd glue_helper cryptd intel_cstate
>          > intel_rapl_perf pcspkr i915 prime_numbers lpc_ich drm_kms_helper drm
>         idma64
>          > fb_sys_fops mei_me syscopyarea intel_lpss_pci sysfillrect intel_lpss
>          > sysimgblt mfd_core mei shpchp sg evdev video ip_tables x_tables autofs4
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.078913]  ext4 crc16 mbcache jbd2
>          > fscrypto btrfs zstd_decompress zstd_compress xxhash raid10 raid456
>          > async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq
>          > libcrc32c crc32c_generic raid1 raid0 multipath linear md_mod sd_mod
>          > mmc_block igb i2c_algo_bit dca ahci sdhci_pci sdhci xhci_pci libahci ptp
>          > crc32c_intel i2c_i801 xhci_hcd mmc_core pps_core libata usbcore scsi_mod
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.078982] CPU: 0 PID: 1154 Comm:
>          > qemu-system-x86 Not tainted 4.14.89 #1
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.078985] I-pipe domain: Linux
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.078988] task: ffff94aff6f49c80
>          > task.stack: ffffb5be80a58000
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.078991] RIP:
>          > 0010:__kernel_fpu_end+0x8b/0xa0
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.078994] RSP:
>         0018:ffffb5be80a5bcf8
>          > EFLAGS: 00010246
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.078999] RAX:
>         00000000ffffff00 RBX:
>          > ffff94aff6e88000 RCX: ffff94aff6f49c80
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079002] RDX:
>         00000000ffffffff RSI:
>          > 0000000000000246 RDI: ffff94aff6f4a800
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079005] RBP:
>         ffffb5be80a5bdd0 R08:
>          > ffffffffc0c1c060 R09: ffff94aff6f8f000
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079010] R10:
>         0000000000004bc0 R11:
>          > ffff94afe4680008 R12: ffffffffc0ca0f80
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079013] R13:
>         0000000000000000 R14:
>          > ffff94aff6e88000 R15: ffff94aff83c9bc0
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079017] FS:
>          > 00007f388aba8700(0000) GS:ffff94affb200000(0000) knlGS:0000000000000000
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079020] CS:  0010 DS: 0000 ES:
>          > 0000 CR0: 0000000080050033
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079023] CR2:
>         000001b737101034 CR3:
>          > 0000000178424000 CR4: 00000000003426f0
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079026] Call Trace:
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079029]
>          > kvm_put_guest_fpu.part.165+0x43/0xc0 [kvm]
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079032]
>          > kvm_arch_vcpu_ioctl_run+0x6bd/0x18a0 [kvm]
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079035]  ?
>          > kvm_arch_vcpu_load+0x4d/0x250 [kvm]
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079038]  ?
>         vmx_vcpu_load+0x5/0x3e0
>          > [kvm_intel]
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079041]  ?
>          > kvm_arch_vcpu_load+0x68/0x250 [kvm]
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079044]  ?
>          > kvm_vcpu_ioctl+0x315/0x5f0 [kvm]
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079047]  ?
>          > kvm_arch_vcpu_ioctl_run+0x5/0x18a0 [kvm]
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079050]
>          > kvm_vcpu_ioctl+0x315/0x5f0 [kvm]
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079053]  do_vfs_ioctl+0xa2/0x620
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079056]  SyS_ioctl+0x74/0x80
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079059] 
>         do_syscall_64+0x86/0x140
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079062]
>          > entry_SYSCALL_64_after_hwframe+0x3d/0xa2
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079065] RIP: 0033:0x7f389962edd7
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079068] RSP:
>         002b:00007f388aba7828
>          > EFLAGS: 00000246 ORIG_RAX: 0000000000000010
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079073] RAX:
>         ffffffffffffffda RBX:
>          > 0000000000000000 RCX: 00007f389962edd7
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079076] RDX:
>         0000000000000000 RSI:
>          > 000000000000ae80 RDI: 000000000000001b
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079079] RBP:
>         00007f388aba7920 R08:
>          > 0000558c6bf3a900 R09: 00000000000000ff
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079082] R10:
>         00007f388aba7840 R11:
>          > 0000000000000246 R12: 0000000000000000
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079085] R13:
>         00007ffec978276f R14:
>          > 0000000000000000 R15: 00007f389e9b9040
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079088] Code: 89 3c 24 eb 0a
>         0f 1f
>          > 00 db e2 0f 77 db 04 24 0f 1f 44 00 00 b8 ff ff ff ff 89 c2 48 0f c7
>         1f eb
>          > ad 48 0f ae 89 80 0b 00 00 eb a3 <0f> 0b eb aa e8 ac 37 04 00 66 90 66 2e
>          > 0f 1f 84 00 00 00 00 00
>          >
>          > Mar  1 01:14:05 debiankvm kernel: [   96.079184] ---[ end trace
>          > 97cffb6b036eaaeb ]---
>          >
> 
>         -- 
>         Siemens AG, Corporate Technology, CT RDA IOT SES-DE
>         Corporate Competence Center Embedded Linux
> 

-- 
Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux



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