On Tue, May 28, 2024 at 10:52:41PM +0200, Ingo Saitz wrote:
> I hit the same error on devuan unstable, with startpar crashing on boot:
> 
> [   10.025881] dracut: Switching root
> [   10.339687] startpar[720]: segfault at 0 ip 0000000000000000 sp 00007fffbdca9c38 error 14 likely on CPU 1 (core 0, socket 0)
> [   10.340225] Code: Unable to access opcode bytes at 0xffffffffffffffd6.
> [   10.349516] startpar[820]: segfault at 0 ip 0000000000000000 sp 00007ffd52c34e48 error 14 likely on CPU 3 (core 1, socket 0)
> [   10.350086] Code: Unable to access opcode bytes at 0xffffffffffffffd6.

I can reproduce the error with the attached c program.

[ 1325.980596] thoughts[2127]: segfault at 0 ip 0000000000000000 sp 00007fff183d66e8 error 14 likely on CPU 0 (core 0, socket 0)
[ 1325.981180] Code: Unable to access opcode bytes at 0xffffffffffffffd6.

Simply calling mlockall(MCL_CURRENT) and then fork() seems to be enough
to trigger the error.

    Ingo
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const_cast<long double>(Λ)