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This was the whole reason why I implemented the monogame-patcher even
though it is very useful for other games as well.
So the main issue why patching was needed is that the game writes its
savegames into the same directories as other assets, so we need to be
very careful about which method we patch and how in order to avoid
failures to load other assets rather than savegames.
However while in principle the game runs fine there is a Heisenbug
hidden, so it segfaults whenever strace is not used. Here is the
backtrace:
#0 0x0000000000f973be in ?? ()
#1 0x0000000000f8f444 in ?? ()
#2 0x0000000000f2379b in ?? ()
#3 0x0000000000f2940b in ?? ()
#4 0x0000000000f1fa87 in ?? ()
#5 0x00000000008e8cc8 in ?? ()
#6 0x00007ffff79bc5a7 in start_thread () from libpthread.so.0
#7 0x00007ffff61cf22f in clone () from libc.so.6
Disassembly around 0xf973be:
f973a2: 45 0f b6 4f 02 movzbl 0x2(%r15),%r9d
f973a7: ba 04 00 00 00 mov $0x4,%edx
f973ac: 41 80 f9 02 cmp $0x2,%r9b
f973b0: 74 05 je f973b7
f973b2: 41 0f b6 57 03 movzbl 0x3(%r15),%edx
f973b7: 48 8b 40 30 mov 0x30(%rax),%rax
f973bb: 83 f9 1b cmp $0x1b,%ecx
>f973be: 8b 40 08 mov 0x8(%rax),%eax
f973c1: 89 44 24 58 mov %eax,0x58(%rsp)
f973c5: 0f 86 6d 01 00 00 jbe f97538
f973cb: c6 44 24 5f 00 movb $0x0,0x5f(%rsp)
f973d0: 45 31 ff xor %r15d,%r15d
f973d3: 89 54 24 28 mov %edx,0x28(%rsp)
f973d7: 89 74 24 20 mov %esi,0x20(%rsp)
f973db: 44 88 44 24 18 mov %r8b,0x18(%rsp)
f973e0: 44 88 4c 24 30 mov %r9b,0x30(%rsp)
f973e5: e8 16 fa 92 ff callq 8c6e00
The last callq is for <operator new(unsigned long)@@Base+0x27c9d0>, so
I'd suppose this might be a bug in the patched Mono version of Unity but
could also be a chain reaction (who knows).
Probably the reason why it works with strace might be a race condition,
but I haven't thoroughly debugged this. Especially if there are no
symbols available it's very hard to debug, so I'll leave that to some
day in the future.
Signed-off-by: aszlig <aszlig@nix.build>
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