[Pkg-javascript-devel] Bug#922075: Bug#922075: npm: segfault during extract on i386

[Bernhard Übelacker]

Hello Jérémy,

Am 29.03.19 um 12:44 schrieb Jérémy Lal:
> This fails too:
> yarnpkg add electron-spellchecker at 1.1.2
> 
> Are you all doing this on qemu or on real hardware ?
> On i686 ?
> I'm asking because buster does not support i586, nor does nodejs,
> and it seems qemu defaults to something < i686 (to be verified).

I tested just inside qemu.
Teemu Ikonen's original report looks like on real hardware.

Other cases where cpu features were related, the process
usually gets a SIGILL on a instruction not supported.
In this case we get SIGSEGV on a mov instruction, which
is quite common I guess.
So I am not sure, if in this case the cpu is the issue.

Qemu can also use other cpu configurations like "-M max"
or "-M host". That way it should be able to do all what the
host is able to? Have not tested such a configuration.

I have repeated the test on real hardware and it crashes
the same as in the VM. I hope buster is supported on
this hardware?

Kind regards,
Bernhard



Real hardware:
root at debian-athlonx2-32:~# lscpu
Architecture:        i686
CPU op-mode(s):      32-bit, 64-bit
Byte Order:          Little Endian
Address sizes:       40 bits physical, 48 bits virtual
CPU(s):              2
On-line CPU(s) list: 0,1
Thread(s) per core:  1
Core(s) per socket:  2
Socket(s):           1
Vendor ID:           AuthenticAMD
CPU family:          15
Model:               107
Model name:          AMD Athlon(tm) 64 X2 Dual Core Processor 5000+
Stepping:            1
CPU MHz:             1000.000
CPU max MHz:         2600,0000
CPU min MHz:         1000,0000
BogoMIPS:            2009.24
Virtualization:      AMD-V
L1d cache:           64K
L1i cache:           64K
L2 cache:            512K
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 rdtscp lm 3dnowext 3dnow rep_good cpuid extd_apicid pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy 3dnowprefetch vmmcall lbrv

Mär 29 14:10:10 debian-athlonx2-32 kernel: npm[5417]: segfault at 1085 ip b6f9023b sp bfd1a1b4 error 4 in libnode.so.64[b6eb4000+b4a000]
Mär 29 14:10:10 debian-athlonx2-32 kernel: Code: 01 00 00 85 c0 74 16 8d 96 6c 01 00 00 39 d0 74 0c 83 ec 0c 50 e8 f5 14 f5 ff 83 c4 10 8b 86 4c 01 00 00 85 c0 74 0c 83 ec 0c <8b>
 10 50 ff 52 04 83 c4 10 8b 83 54 69 01 00 8b 4e 04 83 c0 08 89

######


Inside my qemu i386 VM with default cpu:
root at debian:~# lscpu
Architecture:        i686
CPU op-mode(s):      32-bit
Byte Order:          Little Endian
Address sizes:       36 bits physical, 32 bits virtual
CPU(s):              14
On-line CPU(s) list: 0-13
Thread(s) per core:  1
Core(s) per socket:  1
Socket(s):           14
Vendor ID:           AuthenticAMD
CPU family:          6
Model:               6
Model name:          QEMU Virtual CPU version 2.5+
Stepping:            3
CPU MHz:             2994.374
BogoMIPS:            5988.74
Hypervisor vendor:   KVM
Virtualization type: full
Flags:               fpu de pse tsc msr pae mce cx8 apic sep pge cmov pat mmx fxsr sse sse2 cpuid tsc_known_freq pni x2apic hypervisor vmmcall


######


$ qemu-system-i386 -cpu help
...
x86 host                  KVM processor with all supported host features  
x86 max                   Enables all features supported by the accelerator in the current host