Hi all, Over the holidays I've been experimenting with the new Debian powerpc port to see if it will allow me to test some qemu-system-ppc changes on a second-hand G4 Mac Mini and unfortunately I am experiencing hard lockups when trying to boot an OS X ISO in the guest with KVM enabled. Debian ports is currently using 4.19 and as the default config didn't enable KVM by default, I grabbed a vanilla 4.19.13 source from kernel.org and compiled it myself to make sure that no custom Debian patches could potentially cause any issues. When booting an OS X 10.2 ISO the guest starts normally until the point where the Apple logo disappears and the blue desktop background appears on screen, at which point the physical console locks up hard. With a background SSH session running I was able to grab the following from the system logs: [ 977.269291] qemu-system-ppc[1972]: floating point exception (8) at aab8bce4 nip aab8bce4 lr aab8bca4 code e in libc-2.28.so[aaa89000+1cd000] [ 977.269323] qemu-system-ppc[1972]: code: 80c1001c 81228fd0 7c7d1b78 7fe3fb78 2f890000 419e0018 39200031 7c09071d [ 977.269338] qemu-system-ppc[1972]: code: 7d200026 55291ffe 69290001 44000002 <7c000026> 74091000 7c7f1b78 40820034 [ 977.274455] in:imklog[277]: floating point exception (8) at 3c7e74 nip 3c7e74 lr 3c7e3c code e in libpthread-2.28.so[3b1000+25000] [ 977.274588] in:imklog[277]: code: 38000003 81228fd0 7c7b1b78 7fa3eb78 2f890000 419e0018 39200031 7c09071d [ 977.274602] in:imklog[277]: code: 7d200026 55291ffe 69290001 44000002 <7c000026> 74091000 7c7f1b78 40820034 [ 977.274675] systemd-journal[169]: floating point exception (8) at 56cb30 nip 56cb30 lr 56caf4 code e in libc-2.28.so[45b000+1cd000] [ 977.274687] systemd-journal[169]: code: 380000ee 81228fd0 7c7a1b78 7f83e378 2f890000 419e0018 39200031 7c09071d [ 977.274701] systemd-journal[169]: code: 7d200026 55291ffe 69290001 44000002 <7c000026> 74091000 7c7f1b78 40820038 [ 977.276028] systemd[1]: floating point exception (8) at 84aa84 nip 84aa84 lr 84aa4c code e in libc-2.28.so[739000+1cd000] [ 977.276053] systemd[1]: code: 7fc802a6 93e1002c 3fde000e 3bdee5a8 81228b30 2f890000 409e0064 81228fd0 [ 977.276067] systemd[1]: code: 380000ee 2f890000 409e0034 44000002 <7c000026> 74091000 7c7f1b78 408200d0 [ 977.276096] systemd[1]: floating point exception (8) at a1f2e0 nip a1f2e0 lr 1003f4 code e in systemd[93d000+141000] [ 977.276105] systemd[1]: code: 48009861 4bfffedc 80fe8004 811e83f8 7fe3fb78 38c0008b 80be8008 38800000 [ 977.276119] systemd[1]: code: 38e70598 4cc63182 48009839 4bffff30 <9421fe90> 7c0802a6 429f0005 9361015c [ 977.276137] systemd[1]: floating point exception (8) at a1f2e0 nip a1f2e0 lr 1003f4 code e in systemd[93d000+141000] [ 977.276143] systemd[1]: code: 48009861 4bfffedc 80fe8004 811e83f8 7fe3fb78 38c0008b 80be8008 38800000 [ 977.276155] systemd[1]: code: 38e70598 4cc63182 48009839 4bffff30 <9421fe90> 7c0802a6 429f0005 9361015c [ 977.276172] systemd[1]: floating point exception (8) at a1f2e0 nip a1f2e0 lr 1003f4 code e in systemd[93d000+141000] [ 977.276179] systemd[1]: code: 48009861 4bfffedc 80fe8004 811e83f8 7fe3fb78 38c0008b 80be8008 38800000 [ 977.276191] systemd[1]: code: 38e70598 4cc63182 48009839 4bffff30 <9421fe90> 7c0802a6 429f0005 9361015c [ 977.276209] systemd[1]: floating point exception (8) at a1f2e0 nip a1f2e0 lr 1003f4 code e in systemd[93d000+141000] [ 977.276215] systemd[1]: code: 48009861 4bfffedc 80fe8004 811e83f8 7fe3fb78 38c0008b 80be8008 38800000 [ 977.276227] systemd[1]: code: 38e70598 4cc63182 48009839 4bffff30 <9421fe90> 7c0802a6 429f0005 9361015c [ 977.276245] systemd[1]: floating point exception (8) at a1f2e0 nip a1f2e0 lr 1003f4 code e in systemd[93d000+141000] [ 977.276251] systemd[1]: code: 48009861 4bfffedc 80fe8004 811e83f8 7fe3fb78 38c0008b 80be8008 38800000 [ 977.276263] systemd[1]: code: 38e70598 4cc63182 48009839 4bffff30 <9421fe90> 7c0802a6 429f0005 9361015c [ 977.276281] systemd[1]: floating point exception (8) at a1f2e0 nip a1f2e0 lr 1003f4 code e in systemd[93d000+141000] [ 977.276287] systemd[1]: code: 48009861 4bfffedc 80fe8004 811e83f8 7fe3fb78 38c0008b 80be8008 38800000 [ 977.276299] systemd[1]: code: 38e70598 4cc63182 48009839 4bffff30 <9421fe90> 7c0802a6 429f0005 9361015c [ 978.305332] systemd: 35 output lines suppressed due to ratelimiting Figuring that this might be a regression, I started to work my way backwards through various source tarballs using the Debian config as a starting point to find out when this last worked, and came up with the results below: 4.4.169 - last known working version, OS X boots to the installer 4.5.7 | 4.6.7 | 4.7.9 - all build, but loading initrd modules fails on reboot with multiple "module_32: XXX unknown ADD relocation YYYY" messages 4.8.17 - first known bad version which locks up So firstly: can anyone think of any changes between 4.4 - 4.8 that might be responsible for the errors that appear in the logs above? That would certainly save quite a bit of time bisecting this on real hardware. And secondly: if not, can someone point me towards a solution for the "module_32: XXX unknown ADD relocation YYYY" messages so I can manually patch the sources between 4.4.169 and 4.8.17 so I can hopefully come back to the list with a more accurate bisection? Many thanks, Mark.
