Bug#1084955: Bug#1084954: Fwd: llvm-toolchain-*: assembly code seems to depend on build cpu capabilities

[Chris Hofstaedtler]

Just making sure everybody, esp. both bugs, got the message.

On Mon, Apr 07, 2025 at 02:42:46PM +0000, Holger Levsen wrote:
> On Sun, Apr 06, 2025 at 04:00:41PM +0200, Paul Gevers wrote:
> > I assume it is still valid to do this. At least without information this bug
> > might remain RC and I understand is hardly actionable. I guess you only need
> > to inspect the two nodes that were used for one of the failing
> > llvm-toolchain-18|19 runs e.g. ionos1-amd64 vs ionos15-amd64
> 
> holger at ionos15-amd64:~ $ /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 --help
> Usage: /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]
> You have invoked 'ld.so', the program interpreter for dynamically-linked
> ELF programs.  Usually, the program interpreter is invoked automatically
> when a dynamically-linked executable is started.
> 
> [...]
> 
> This program interpreter self-identifies as: /lib64/ld-linux-x86-64.so.2
> 
> Shared library search path:
>   (libraries located via /etc/ld.so.cache)
>   /lib/x86_64-linux-gnu (system search path)
>   /usr/lib/x86_64-linux-gnu (system search path)
>   /lib (system search path)
>   /usr/lib (system search path)
> 
> Subdirectories of glibc-hwcaps directories, in priority order:
>   x86-64-v4
>   x86-64-v3 (supported, searched)
>   x86-64-v2 (supported, searched)
> 
> Legacy HWCAP subdirectories under library search path directories:
>   haswell (AT_PLATFORM; supported, searched)
>   tls (supported, searched)
>   avx512_1
>   x86_64 (supported, searched)
> holger at ionos15-amd64:~ $ 
> 
> holger at ionos15-amd64:~ $ cat /proc/cpuinfo |head -28
> processor	: 0
> vendor_id	: GenuineIntel
> cpu family	: 6
> model		: 60
> model name	: Intel Core Processor (Haswell)
> stepping	: 1
> microcode	: 0x1
> cpu MHz		: 2394.454
> cache size	: 4096 KB
> physical id	: 0
> siblings	: 2
> core id		: 0
> cpu cores	: 1
> apicid		: 0
> initial apicid	: 0
> fpu		: yes
> fpu_exception	: yes
> cpuid level	: 13
> 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 pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology cpuid tsc_known_freq pni pclmulqdq vmx ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm cpuid_fault pti ssbd ibrs ibpb stibp tpr_shadow flexpriority ept vpid ept_ad fsgsbase bmi1 hle avx2 smep bmi2 erms invpcid rtm xsaveopt arat vnmi md_clear
> vmx flags	: vnmi preemption_timer posted_intr invvpid ept_x_only ept_ad ept_1gb flexpriority apicv tsc_offset vtpr mtf vapic ept vpid unrestricted_guest vapic_reg vid shadow_vmcs
> bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs taa itlb_multihit srbds mmio_unknown bhi
> bogomips	: 4788.90
> clflush size	: 64
> cache_alignment	: 64
> address sizes	: 40 bits physical, 48 bits virtual
> power management:
> 
> I don't have access to ionos1 running that CPU anymore, as IONOS
> asked me to migrate machines away from precicely that CPU type,
> so here is the same command on ionos11:
> 
> 
> holger at ionos11-amd64:~ $ /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 --help
> Usage: /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]
> [...]
> This program interpreter self-identifies as: /lib64/ld-linux-x86-64.so.2
> 
> Shared library search path:
>   (libraries located via /etc/ld.so.cache)
>   /lib/x86_64-linux-gnu (system search path)
>   /usr/lib/x86_64-linux-gnu (system search path)
>   /lib (system search path)
>   /usr/lib (system search path)
> 
> Subdirectories of glibc-hwcaps directories, in priority order:
>   x86-64-v4
>   x86-64-v3
>   x86-64-v2 (supported, searched)
> 
> Legacy HWCAP subdirectories under library search path directories:
>   x86_64 (AT_PLATFORM; supported, searched)
>   tls (supported, searched)
>   avx512_1
>   x86_64 (supported, searched)
> holger at ionos11-amd64:~ $ 
> 
> holger at ionos11-amd64:~ $ cat /proc/cpuinfo |head -28
> processor	: 0
> vendor_id	: AuthenticAMD
> cpu family	: 21
> model		: 1
> model name	: AMD Opteron 62xx class CPU
> stepping	: 2
> microcode	: 0x1000065
> cpu MHz		: 2600.000
> cache size	: 512 KB
> physical id	: 0
> siblings	: 1
> core id		: 0
> cpu cores	: 1
> apicid		: 0
> initial apicid	: 0
> fpu		: yes
> fpu_exception	: yes
> cpuid level	: 13
> 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 syscall nx mmxext pdpe1gb rdtscp lm rep_good nopl cpuid extd_apicid tsc_known_freq pni pclmulqdq ssse3 cx16 sse4_1 sse4_2 x2apic popcnt aes xsave avx hypervisor lahf_lm cmp_legacy svm abm sse4a misalignsse 3dnowprefetch osvw ssbd ibpb vmmcall virt_ssbd arat npt nrip_save
> bugs		: fxsave_leak sysret_ss_attrs null_seg spectre_v1 spectre_v2 spec_store_bypass retbleed ibpb_no_ret
> bogomips	: 5200.00
> TLB size	: 1024 4K pages
> clflush size	: 64
> cache_alignment	: 64
> address sizes	: 40 bits physical, 48 bits virtual
> power management:
> 
> 
> Please note that both CPUs are vitualised (running on that actual CPU hardware).