Bug 15526

Created attachment 5054 [details]
Second serial port log

Created attachment 5055 [details]
test image log

Also probably related earlier in the log:

[    0.206386] smpboot: x86: Booting SMP configuration:
[    0.206588] .... node  #0, CPUs:      #1
[    0.084519] ------------[ cut here ]------------
[    0.084519] WARNING: This combination of AMD processors is not suitable for SMP.
[    0.084519] WARNING: CPU: 1 PID: 0 at /arch/x86/kernel/cpu/amd.c:341 init_amd+0xaee/0xbcc
[    0.084519] Modules linked in:
[    0.084519] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.6.32-yocto-standard #1
[    0.084519] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[    0.084519] EIP: init_amd+0xaee/0xbcc
[    0.084519] Code: ff 6a 00 8b 55 c4 b8 1b 00 01 c0 8b 4d c8 e8 e9 82 67 00 58 e9 79 fc ff ff c6 05 56 0b a6 d7 01 68 cc 69 7d d7 e8 4e ec 02 00 <0f> 0b 5e e9 ff fb ff ff 51 b8 21 10 01 c0 89 da 89 f1 e8 bb 82 67
[    0.084519] EAX: 00000044 EBX: 20000000 ECX: 00000000 EDX: d796c18c
[    0.084519] ESI: ef7fb81d EDI: ef7fb7a0 EBP: c11b5f54 ESP: c11b5f10
[    0.084519] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00210082
[    0.084519] CR0: 80050033 CR2: 00000000 CR3: 17bbb000 CR4: 00150690
[    0.084519] Call Trace:
[    0.084519]  ? show_regs+0x4f/0x58
[    0.084519]  ? init_amd+0xaee/0xbcc
[    0.084519]  ? __warn+0x70/0x138
[    0.084519]  ? init_amd+0xaee/0xbcc
[    0.084519]  ? report_bug+0x160/0x184
[    0.084519]  ? exc_overflow+0x38/0x38
[    0.084519]  ? handle_bug+0x2d/0x58
[    0.084519]  ? exc_invalid_op+0x18/0x54
[    0.084519]  ? handle_exception+0x133/0x133
[    0.084519]  ? exc_overflow+0x38/0x38
[    0.084519]  ? init_amd+0xaee/0xbcc
[    0.084519]  ? exc_overflow+0x38/0x38
[    0.084519]  ? init_amd+0xaee/0xbcc
[    0.084519]  identify_cpu+0x150/0x7c4
[    0.084519]  identify_secondary_cpu+0x17/0xf0
[    0.084519]  smp_store_cpu_info+0x3c/0x48
[    0.084519]  start_secondary+0x68/0xf4
[    0.084519]  startup_32_smp+0x156/0x158
[    0.084519] ---[ end trace 0000000000000000 ]---
[    0.084519] Disabling lock debugging due to kernel taint
[    0.237606]  #2 #3
[    0.260084] smp: Brought up 1 node, 4 CPUs
[    0.261077] smpboot: Max logical packages: 1
[    0.261583] smpboot: Total of 4 processors activated (33537.02 BogoMIPS)

I'd note that this is the new cluster and there are AMD systems in there. /proc/cpuinfo from that f40 worker:

processor	: 31
vendor_id	: AuthenticAMD
cpu family	: 25
model		: 97
model name	: AMD Ryzen 9 7950X3D 16-Core Processor
stepping	: 2
microcode	: 0xa601206
cpu MHz		: 400.000
cache size	: 1024 KB
physical id	: 0
siblings	: 32
core id		: 15
cpu cores	: 16
apicid		: 31
initial apicid	: 31
fpu		: yes
fpu_exception	: yes
cpuid level	: 16
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good amd_lbr_v2 nopl nonstop_tsc cpuid extd_apicid aperfmperf rapl pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate ssbd mba perfmon_v2 ibrs ibpb stibp ibrs_enhanced vmmcall fsgsbase bmi1 avx2 smep bmi2 erms invpcid cqm rdt_a avx512f avx512dq rdseed adx smap avx512ifma clflushopt clwb avx512cd sha_ni avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local user_shstk avx512_bf16 clzero irperf xsaveerptr rdpru wbnoinvd cppc arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif x2avic v_spec_ctrl vnmi avx512vbmi umip pku ospke avx512_vbmi2 gfni vaes vpclmulqdq avx512_vnni avx512_bitalg avx512_vpopcntdq rdpid overflow_recov succor smca fsrm flush_l1d
bugs		: sysret_ss_attrs spectre_v1 spectre_v2 spec_store_bypass srso
bogomips	: 8383.88
TLB size	: 3584 4K pages
clflush size	: 64
cache_alignment	: 64
address sizes	: 48 bits physical, 48 bits virtual
power management: ts ttp tm hwpstate cpb eff_freq_ro [13] [14

I'm starting a new build on a different builder to see if I can reproduce this.

I didn't see anything like it in my sanity testing.

I added a check for the kernel traceback in parselogs and executing qemux86 on any new valkyrie cluster worker gives that same error:

https://valkyrie.yoctoproject.org/#/builders/30/builds/50 - fedora40
https://valkyrie.yoctoproject.org/#/builders/30/builds/51 - ubuntu2204
https://valkyrie.yoctoproject.org/#/builders/30/builds/52 - debian12

I suspect the interrupt issue is a separate one to the SMP KVM 32 bit traceback. qemux8664 doesn't do this.

Just to be clear, these failures were on the new cluster which has AMD CPUs rather than Intel ones. I'm not sure why that breaks 32 bit KVM.

Just to confirm: is this limited to qemux86 as it depends on KVM? Does it happen on qemux86-64?

(In reply to Ross Burton from comment #8)
> Just to confirm: is this limited to qemux86 as it depends on KVM?

I believe so.

> Does it happen on qemux86-64?

Not that I can see.

Created attachment 5056 [details]
qemux86 boot log on AMD 5950 CPU

Datapoint, qemux86 is booting to prompt on my AMD 5950 CPU on Debian 11.
NOTE: is is throwing an error about not enabling SMP in the kernel log.

Running poky commit ac40cb5ee24a8ef44b941c4b9bbf6eec6f61d13c

arch/x86/kernel/cpu/amd.c: init_amd_k7(struct cpuinfo_x86 *c)

	/*
	 * Don't taint if we are running SMP kernel on a single non-MP
	 * approved Athlon
	 */
	WARN_ONCE(1, "WARNING: This combination of AMD"
		" processors is not suitable for SMP.\n");
	add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_NOW_UNRELIABLE);

https://lists.gnu.org/archive/html/qemu-devel/2010-03/msg01428.html

https://lkml.org/lkml/2010/3/30/397

so the error is harmless and can be ignored. We just need to find out how to disable it.

We are about to fix the trackback issue but the underlying IRQ issue remains.

Bulk move as requesting during YP BB meeting.

Kernel version has changed too much so resolving as obsolete.

Open an new issue if seen again.