Bug#993162: libc6: i386 (Geode LX): latest push to Bookwork produces multiple sig ILL

[Martin-Éric Racine <martin-eric.racine@iki.fi>]

Package: libc6
Version: 2.31-17
Severity: grave
Justification: renders package unusable

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Since 2.31-17 trickled into Bookworm, a number of executables (including APT and GDB) die with sig ILL. An example:

$ sudo coredumpctl debug 1011
           PID: 1011 (apt-get)
           UID: 0 (root)
           GID: 0 (root)
        Signal: 4 (ILL)
     Timestamp: Sat 2021-08-28 11:00:34 EEST (3min 22s ago)
  Command Line: apt-get --quiet --quiet update
    Executable: /usr/bin/apt-get
 Control Group: /user.slice/user-1000.slice/session-4.scope
          Unit: session-4.scope
         Slice: user-1000.slice
       Session: 4
     Owner UID: 1000 (perkelix)
       Boot ID: 77dfa6eb16584c02b84de4e2b8feb781
    Machine ID: 1063a9d1fb9df6e371ea9f94491345ed
      Hostname: geode
       Storage: /var/lib/systemd/coredump/core.apt-get.0.77dfa6eb16584c02b84de4e2b8feb781.1011.1630137634000000.zst
       Message: Process 1011 (apt-get) of user 0 dumped core.
                
                Stack trace of thread 1011:
                #0  0x00000000b7ad2ed0 __cpu_indicator_init (libgcc_s.so.1 + 0x2ed0)
                #1  0x00000000b7faf02c call_init (ld-linux.so.2 + 0x1102c)
                #2  0x00000000b7faf132 call_init (ld-linux.so.2 + 0x11132)
                #3  0x00000000b7f9f0fa _dl_start_user (ld-linux.so.2 + 0x10fa)

Stack trace for other executables show the same cause as above.

$ cat /proc/cpuinfo 
processor	: 0
vendor_id	: AuthenticAMD
cpu family	: 5
model		: 10
model name	: Geode(TM) Integrated Processor by AMD PCS
stepping	: 2
cpu MHz		: 497.996
cache size	: 128 KB
physical id	: 0
siblings	: 1
core id		: 0
cpu cores	: 1
apicid		: 0
initial apicid	: 0
fdiv_bug	: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 1
wp		: yes
flags		: fpu de pse tsc msr cx8 sep pge cmov clflush mmx mmxext 3dnowext 3dnow cpuid 3dnowprefetch vmmcall
bugs		: sysret_ss_attrs spectre_v1 spectre_v2 spec_store_bypass
bogomips	: 995.99
clflush size	: 32
cache_alignment	: 32
address sizes	: 32 bits physical, 32 bits virtual
power management:

Feel free to reassign as appropriate.

Cheers!
Martin-Éric

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