[SOLVED] Segfaults after recompilation of libc

[tkzv]

During an update various programs started segfaulting. This may have started after sys-libs/glibc was updated to 2.42-r5.

The dmesg lines are

Code: Select all

syncqt[19434]: segfault at 1 ip 0000000000000001 sp 00007ffcdabd3a08 error 14 likely on CPU 0 (core 0, socket 0)
Code: Unable to access opcode bytes at 0xffffffffffffffd7.

I compiled everything with CFLAGS="-O2 -pipe -march=native" and CPU_FLAGS_X86="aes avx f16c fma3 mmx mmxext pclmul popcnt sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 xop" and it worked fine until today. What is wrong?

emerge --info: https://paste.gentoo.zip/od5hFXwS
(I added nostrip after this all started, it did not affect segfaults for qtbase files)

UPDATE: All problematic programs were required for building new Qt or KDE packages. All of them give the error "'segfault at 1 ip 0000000000000001". Could this be a GCC problem?

ANSWER: There were 2 libc.so.6 files — /usr/lib64/libc.so.6 (left from autumn profile switch, complicated by hardware failures, AFAIR) and /lib64/libc.so.6 (correct). Some programs seemed to have used the wrong library. The affected packages include dev-qt/qtbase, dev-lang/tcl, dev-libs/protobuf.