powerpc64 kernel panic if you disable CONFIG_PPC_TRANSACTIONAL_MEM?

From: Rob Landley
Date: Sat Dec 16 2017 - 16:34:22 EST

I just added a ppc64 target to https://github.com/landley/mkroot which
means I built 4.14 with the attached miniconfig and ran it with the
attached qemu command line, and it works fine as is but if you remove
the transactional mem line from the config the kernel panics instead
of launching a shell prompt:

init[1]: unhandled signal 4 at 0000000010001a04 nip 0000000010001a04
lr 000000001002ebe8 code 1
Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004

CPU: 0 PID: 1 Comm: init Not tainted 4.14.0 #1
Call Trace:
[c00000000e02fa40] [c0000000004ba730] dump_stack+0xb0/0xf0 (unreliable)
[c00000000e02fa80] [c0000000000602a0] panic+0x138/0x2f8
[c00000000e02fb20] [c00000000006541c] do_exit+0xa9c/0xaa0
[c00000000e02fbe0] [c0000000000654d8] do_group_exit+0x58/0xf0
[c00000000e02fc20] [c000000000073274] get_signal+0x1c4/0x6b0
[c00000000e02fd10] [c0000000000142a0] do_signal+0x60/0x290
[c00000000e02fe00] [c00000000001461c] do_notify_resume+0x8c/0xd0
[c00000000e02fe30] [c00000000000b630] ret_from_except_lite+0x5c/0x60
Rebooting in 1 seconds..


Attachment: powerpc64le.miniconf
Description: Binary data

Attachment: qemu-powerpc64le.sh
Description: Bourne shell script