Hello, @alexis-m2osw, thanks for reporting this bug!
Are you aware of exact steps to reproduce this behavior from a fresh Ubuntu
install?
Meanwhile, I checked the stack trace and seems this memory misalignment
issue happens in ssl_io_filter_coalesce (from ssl_engine_io.c).
#0 __memcpy_evex_unaligned_erms ()
at ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:265
#1 0x000072c37cab74bf in memcpy (__len=<optimized out>,
__src=<optimized out>, __dest=<optimized out>)
at /usr/include/x86_64-linux-gnu/bits/string_fortified.h:29
#2 ssl_io_filter_coalesce (f=0x72c37ced3830, bb=0x72c37a160f48)
at /build/apache2-qqIoZi/apache2-2.4.58/modules/ssl/ssl_engine_io.c:1897
What I found interesting is this #1 entry - it mentiones `string_fortified.h`.
There is this Debian bug from a long long time ago
https://lists.debian.org/debian-apache/2008/06/msg00118.html
Which mentions compiling with -DFORTIFY_SOURCE has caused problems in earlier
version - maybe this is related? Would GCC be wrongly optimizing things? I see
this is amd64, which GCC version is installed?
** Tags added: server-triage-discuss
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https://bugs.launchpad.net/bugs/2107254
Title:
Apache2 crashes with SIGBUS in mod_ssl
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