tests/kernel/fifo/fifo_usage GPF crash on qemu_x86_long

[andrewboie]

Not sure how prevalent this crash is, it might be an intermittent issue, noticed this in a CI run for an unrelated patch:

--------sanity-out/qemu_x86_long/tests/kernel/fifo/fifo_usage/kernel.fifo.usage/handler.log---------
SeaBIOS (version rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org)
Booting from ROM..***** Booting Zephyr OS build zephyr-v2.0.0-840-g6832316e95c0 *****
Running test suite test_fifo_usage
===================================================================
starting test - test_single_fifo_play
PASS - test_single_fifo_play
===================================================================
starting test - test_dual_fifo_play
PASS - test_dual_fifo_play
===================================================================
starting test - test_isr_fifo_play
[00:00:00.010,000] <err> os: ** CPU Exception 13 (code 0/0x0) **

[00:00:00.010,000] <err> os: RIP=fff31ce800105507 RSP=000000000010a788 RFLAGS=0000000000000082

[00:00:00.010,000] <err> os: RAX=fff31ce800105507 RBX=0000000000101c8f RCX=00000000000000ff RDX=0000000000000000

[00:00:00.010,000] <err> os: RSI=0000000000106250 RDI=0000000000101c8f RBP=0000000000107b80 RSP=000000000010a788

[00:00:00.010,000] <err> os: R8=0000000000000000 R9=0000000000000000 R10=0000000000000000 R11=0000000000000000

[00:00:00.010,000] <err> os: R12=0000000000000206 R13=0000000000000000 R14=0000000000000000 R15=0000000000000000

[00:00:00.010,000] <err> os: >>> ZEPHYR FATAL ERROR 0: CPU exception
[00:00:00.010,000] <err> os: Current thread: 0x00107500 (unknown)
[00:00:00.010,000] <err> os: Halting system
--------sanity-out/qemu_x86_long/tests/kernel/fifo/fifo_usage/kernel.fifo.usage/handler.log---------

[nashif]

cant reproduce on qemu_x86_64, also, qemu_x86_long is gone.