On Thu, 18 May 2023, Chavdar Ivanov wrote:
This turned out to be /usr/bin/ftp crashing:
# /usr/bin/ftp -o node-v20.2.0.tar.xz
'https://nodejs.org/dist/v20.2.0/node-v20.2.0.tar.xz'
Trying 104.20.23.46:443 ...
[1] 7100 segmentation fault /usr/bin/ftp -o node-v20.2.0.tar.xz
....
If I run it under gdb, I get:
(gdb) run -o node-v20.2.0.tar.xz
'https://nodejs.org/dist/v20.2.0/node-v20.2.0.tar.xz'
Starting program: /usr/bin/ftp -o node-v20.2.0.tar.xz
'https://nodejs.org/dist/v20.2.0/node-v20.2.0.tar.xz'
Program received signal SIGILL, Illegal instruction.
0x0000f7db5d54be70 in _armv8_sha512_probe () from /usr/lib/libcrypto.so.14
(gdb) bt
#0 0x0000f7db5d54be70 in _armv8_sha512_probe () from /usr/lib/libcrypto.so.14
#1 0x0000f7db5d54c23c in OPENSSL_cpuid_setup () from /usr/lib/libcrypto.so.14
#2 0x0000ffffef643398 in _rtld_call_init_function () from
/usr/libexec/ld.elf_so
#3 0x0000ffffef6436a4 in _rtld_call_init_functions () from
/usr/libexec/ld.elf_so
#4 0x0000ffffef643f74 in _rtld () from /usr/libexec/ld.elf_so
#5 0x0000ffffef640b10 in _rtld_start () from /usr/libexec/ld.elf_so
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
You should ignore SIGILL when it's in libcrypto on some archs. eg. ARM,
PPC & Sparc. On x86 systems, libcrypto uses the CPUID instruction to
determine which optimized assembly routines can be used for speedup. On
ARM etc, it installs a SIGILL handler and just runs test instructions. The
handler being called means _those_ instructions are not available.
So, on ARM, you have to tell gdb to pass through SIGILL to the program:
```
(gdb) handle SIGILL nostop noprint pass
```
The weird and suspicious thing is that /usr/bin/ftp is linked to both
existing libcrypto.so versions:
ldd /usr/bin/ftp
/usr/bin/ftp:
-ledit.3 => /usr/lib/libedit.so.3
-lterminfo.2 => /usr/lib/libterminfo.so.2
-lc.12 => /usr/lib/libc.so.12
-lssl.15 => /usr/lib/libssl.so.15
-lcrypto.14 => /usr/lib/libcrypto.so.14
-lcrypt.1 => /lib/libcrypt.so.1
-lcrypto.15 => /usr/lib/libcrypto.so.15
I would say this is the real reason for the crash (SIGSEGV).
-RVP
