ppc64_cpu --smt=off reports "pnv_smp_cpu_kill_self+0x48/0x2a0" WARNING on baremetal P8 host for each CPU The root console is filled by Warning messages for each cpu === [ 2050.296479] WARNING: CPU: 10 PID: 0 at arch/powerpc/platforms/powernv/smp.c:160 pnv_smp_cpu_kill_self+0x48/0x2a0 [ 2050.296483] Modules linked in: kvm_hv kvm_pr kvm xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_reject_ipv4 iptable_mangle iptable_nat ebtable_filter ebtables ip6_tables iptable_filter bridge stp llc tun cfg80211 rfkill openvswitch nsh nf_conncount nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 sunrpc at24 regmap_i2c joydev i2c_opal vmx_crypto ofpart powernv_flash rtc_opal crct10dif_vpmsum ipmi_powernv ipmi_devintf ipmi_msghandler opal_prd mtd powernv_rng ip_tables xfs libcrc32c ast i2c_algo_bit drm_vram_helper ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm drm_panel_orientation_quirks i2c_core crc32c_vpmsum tg3 uas usb_storage [ 2050.296526] CPU: 10 PID: 0 Comm: swapper/10 Tainted: G W 5.3.8-300.fc31.ppc64le #1 [ 2050.296528] NIP: c0000000000bbed8 LR: c000000000054ef4 CTR: c0000000000bbe90 [ 2050.296530] REGS: c000003c98a23990 TRAP: 0700 Tainted: G W (5.3.8-300.fc31.ppc64le) [ 2050.296531] MSR: 9000000000029033 <SF,HV,EE,ME,IR,DR,RI,LE> CR: 88004422 XER: 00000000 [ 2050.296535] CFAR: c000000000054ef0 IRQMASK: 1 [ 2050.296535] GPR00: c000000000054ef4 c000003c98a23c20 c000000001771f00 0000000000000000 [ 2050.296535] GPR04: c000003ca5a97600 c000000001799cf8 0000000000000050 0000000000000001 [ 2050.296535] GPR08: 0000000000000000 0000000000000001 0000000000000000 0000000000000000 [ 2050.296535] GPR12: c0000000000bbe90 c000003fff797980 c000003ff4353f90 0000000000064204 [ 2050.296535] GPR16: 000001000720fe80 0000000000064210 c000000000052620 c000000000052620 [ 2050.296535] GPR20: c00000000179c1a4 0000000000000050 0000000000000000 c000000001799cf8 [ 2050.296535] GPR24: 0000000000000001 000000000000000a 0000000000000001 0000000000080000 [ 2050.296535] GPR28: c00000000179c030 0000000000000001 000000000000000a c00000000179bdd8 [ 2050.296552] NIP [c0000000000bbed8] pnv_smp_cpu_kill_self+0x48/0x2a0 [ 2050.296555] LR [c000000000054ef4] cpu_die+0x44/0x60 [ 2050.296556] Call Trace: [ 2050.296558] [c000003c98a23c20] [c000003c98e5f000] 0xc000003c98e5f000 (unreliable) [ 2050.296561] [c000003c98a23e00] [c000000000054ef4] cpu_die+0x44/0x60 [ 2050.296563] [c000003c98a23e20] [c000000000024180] arch_cpu_idle_dead+0x20/0x40 [ 2050.296566] [c000003c98a23e40] [c000000000173db4] do_idle+0x274/0x3b0 [ 2050.296569] [c000003c98a23ec0] [c00000000017412c] cpu_startup_entry+0x3c/0x50 [ 2050.296571] [c000003c98a23ef0] [c000000000054c30] start_secondary+0x630/0x660 [ 2050.296574] [c000003c98a23f90] [c00000000000b35c] start_secondary_prolog+0x10/0x14 [ 2050.296575] Instruction dump: [ 2050.296577] fb01ffc0 fb21ffc8 fb41ffd0 fb61ffd8 fb81ffe0 fba1ffe8 fbc1fff0 fbe1fff8 [ 2050.296580] f8010010 f821fe21 892d0988 552907fe <0b090000> 39200002 7d210164 39400003 [ 2050.296584] ---[ end trace 5339fdc1ebf2ca09 ]--- [ 2050.616429] WARNING: CPU: 11 PID: 0 at arch/powerpc/platforms/powernv/smp.c:160 pnv_smp_cpu_kill_self+0x48/0x2a0 === Version-Release number of selected component (if applicable): === $whereis ppc64_cpu ppc64_cpu: /usr/sbin/ppc64_cpu /usr/share/man/man8/ppc64_cpu.8.gz === $rpm -qf /usr/sbin/ppc64_cpu powerpc-utils-1.3.6-3.fc31.ppc64le === How reproducible: execute "ppc64_cpu smt=off" on a baremetal powerPC host. * Problem initially discovered on f31, but present also on f30. * above tried on P8 host, not tested yet on P9.
I forgot to specify above that above cpu warning and trace lines are reported on root console but not in journalctl.
* same problem on P9 with f30, kernel 5.3.8-200 and powerpc-utils-1.3.6
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I don't think this bug is anything to do with powerpc-utils package. Its a kernel issue. Hence closing this bug. If yo hit issue on latest supported distro, please open bug against distro. -Vasant