Unable to install on AMD Athlon(tm) II X2 240e (x86_64)

[ak-ionos]

Additional Info

• I am using Windows Subsystem for Linux

Output of brew config

Not available

Output of brew doctor

Not available

Description of issue

Upon running the install.sh script I get the error below. This happens since version 5.0.2 when portable-ruby was updated to 3.4.7. I was able to install and use homebrew before on this machine. Any idea what could be the problem?

~# uname -a
Linux schoenberg 6.18.0 #1 SMP Tue Dec  2 20:07:55 CET 2025 x86_64 GNU/Linux

~# cat /proc/cpuinfo
processor   : 0
vendor_id   : AuthenticAMD
cpu family  : 16
model       : 6
model name  : AMD Athlon(tm) II X2 240e Processor
stepping    : 2
microcode   : 0x10000b7
cpu MHz     : 2800.362
cache size  : 1024 KB
physical id : 0
siblings    : 2
core id     : 0
cpu cores   : 2
apicid      : 0
initial apicid  : 0
fpu     : yes
fpu_exception   : yes
cpuid level : 5
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 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc cpuid
extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt hw_pstate vmmcall npt lbrv svm_lock nrip_save
bugs        : tlb_mmatch fxsave_leak sysret_ss_attrs null_seg amd_e400 spectre_v1 spectre_v2 spectre_v2_user
bogomips    : 5600.72
TLB size    : 1024 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate

==> Downloading and installing Homebrew...
remote: Enumerating objects: 316596, done.
remote: Counting objects: 100% (121/121), done.
remote: Compressing objects: 100% (86/86), done.
remote: Total 316596 (delta 49), reused 79 (delta 35), pack-reused 316475 (from 4)
remote: Enumerating objects: 55, done.
remote: Counting objects: 100% (34/34), done.
remote: Total 55 (delta 34), reused 34 (delta 34), pack-reused 21 (from 1)
==> Updating Homebrew...
==> Downloading https://ghcr.io/v2/homebrew/core/portable-ruby/blobs/sha256:3cca179476f84b0055766aa976005e3d45da635f0bc7616984675e2232db1eb4
######################################################################## 100.0%
==> Pouring portable-ruby-3.4.7.x86_64_linux.bottle.tar.gz
<internal:kernel>:299: [BUG] Illegal instruction at 0x00005625ad9c77a9
ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [x86_64-linux]

-- Control frame information -----------------------------------------------
c:0004 p:0015 s:0016 e:000013 METHOD <internal:kernel>:299
c:0003 p:0063 s:0009 e:000008 CLASS  <internal:numeric>:325
c:0002 p:0015 s:0006 e:000005 TOP    <internal:numeric>:94 [FINISH]
c:0001 p:0000 s:0003 E:001380 DUMMY  [FINISH]

-- Ruby level backtrace information ----------------------------------------
<internal:numeric>:94:in '<internal:numeric>'
<internal:numeric>:325:in '<class:Integer>'
<internal:kernel>:299:in 'with_yjit'

-- Threading information ---------------------------------------------------
Total ractor count: 1
Ruby thread count for this ractor: 1

-- Machine register context ------------------------------------------------
 RIP: 0x00005625ad9c77a9 RBP: 0x00005625dddea8e0 RSP: 0x00007ffeeb51e130
 RAX: 0x00005625dddea910 RBX: 0x00005625dddea8f0 RCX: 0x00007f6b048a5090
 RDX: 0x0000000000000000 RDI: 0x00005625dde0cfc0 RSI: 0x0000000000000831
  R8: 0x0000000000000003  R9: 0x00007ffeeb51e050 R10: 0x00005625ddde9bf0
 R11: 0x0000000000000003 R12: 0x0000000000000004 R13: 0x00005625dddea000
 R14: 0x00005625dddea918 R15: 0x00007f6b049a4f30 EFL: 0x0000000000010202

-- C level backtrace information -------------------------------------------
unknown address_size:77/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby(rb_vm_bugreport+0x3b1) [0x5625ad9deac1]
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby(rb_bug_for_fatal_signal+0x104) [0x5625ad8272b4]
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby(sigill+0x46) [0x5625ad947ed6]
/lib/x86_64-linux-gnu/libc.so.6(__restore_rt+0x0) [0x7f6b04d8edf0]
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby(vm_exec_core+0x1dc9) [0x5625ad9c77a9]
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby(rb_vm_exec+0x179) [0x5625ad9cb359]
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby(rb_call_builtin_inits+0x21) [0x5625ad85dbd1]
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby(ruby_opt_init.part.0+0xa7) [0x5625ad941e27]
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby(process_options+0x1665) [0x5625ad943e25]
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby(ruby_process_options+0xd7) [0x5625ad9441f7]
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby(ruby_options+0xcc) [0x5625ad830fec]
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/current/bin/ruby(main+0x5e) [0x5625ad6e25be]

[..]

/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/utils/helpers.sh: line 64: 592877 Illegal instruction        "${HOMEBREW_BREW_FILE}" "$@"
Failed during: /home/linuxbrew/.linuxbrew/bin/brew update --force --quiet

[fxcoudert]

For the record, what is your OS distribution and version?

[ak-ionos]

Debian unstable, updated daily.

I have several other (more recent) machines running the exact same environment, where homebrew could be updated without any problems.

[Bo98]

Our Portable Ruby builds currently require a minimum of the equivalent to an Intel Core 2 from 2006. This is a lower requirement than x86_64-v2 that some Linux distributions are starting to require recently. The Core 2 requirement means that the builds require the usual 64-bit instructions plus MMX, SSE, SSE2, SSE3 (called "pni" in procinfo), SSSE3, CX16, LAHF/SAHF ("lahf_lm") and FXSR instruction sets.

You're notably missing SSSE3 which unfortunately didn't get included in AMD Family 10h (16) but did get included in Family 14h (20) a few years later.

[ak-ionos]

Ok, thanks for the competent answer.
Might be time to look for a new homeserver (although this machine still runs several services pretty stable).

[Bo98]

Sorry that there wasn't better news. The requirement has been in place since the Linuxbrew fork was created in 2013 and you might be among the first to have tried it on this particular CPU and reported it to us. We can't really lower the requirement without having to rebuild every package we ship to make sure any instructions are removed.