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+Strange SIGSEGV error on application exit
+I am using Box64 to run [AlphaVM-Basic](https://emuvm.com/), a commercial DEC Alpha emulator, under Fedora Rawhide in a VM on a Mac mini.

+

+Fedora reports

+

+```

+$ uname -a

+Linux minime-fedora 6.1.0-65.fc38.aarch64 #1 SMP PREEMPT_DYNAMIC Mon Dec 12 18:29:36 UTC 2022 aarch64 GNU/Linux

+

+$ cat /etc/os-release 

+NAME="Fedora Linux"

+VERSION="38 (Workstation Edition Prerelease)"

+ID=fedora

+VERSION_ID=38

+VERSION_CODENAME=""

+PLATFORM_ID="platform:f38"

+PRETTY_NAME="Fedora Linux 38 (Workstation Edition Prerelease)"

+```

+

+After applying the workaround from issue #485, I'm able to run my emulated Alpha system. However, when I shutdown the emulator, I get the `Strange SIGSEGV` error shown below.

+

+```

+Dynarec for ARM64, with extension: ASIMD AES CRC32 PMULL ATOMICS PageSize:4096 Cores:2

+Params database has 11 entries

+Box64 with Dynarec v0.2.1 75083907 built on Dec 18 2022 14:46:17

+Using default BOX64_LD_LIBRARY_PATH: ./:lib/:lib64/:x86_64/:bin64/:libs64/

+Using default BOX64_PATH: ./:bin/

+Counted 47 Env var

+Looking for /usr/bin/alphavm_basic

+argv[1]="beta.emu"

+Rename process to "alphavm_basic"

+Using emulated /lib/x86_64-linux-gnu/libpcap.so.1

+Using native(wrapped) libz.so.1

+Using native(wrapped) libdl.so.2

+Using native(wrapped) libc.so.6

+Using native(wrapped) ld-linux-x86-64.so.2

+Using native(wrapped) libpthread.so.0

+Using native(wrapped) librt.so.1

+Using emulated /lib/x86_64-linux-gnu/libstdc++.so.6

+Using native(wrapped) libm.so.6

+Using emulated /lib/x86_64-linux-gnu/libgcc_s.so.1

+Using emulated /lib/x86_64-linux-gnu/libibverbs.so.1

+Using emulated /lib/x86_64-linux-gnu/libnl-route-3.so.200

+Using emulated /lib/x86_64-linux-gnu/libnl-3.so.200

+2022-12-20 16:21:36.019: alphavm: AlphaVM-Basic 1.5.76

+<alphavm log messages elided...>

+2022-12-20 16:37:54.004: alphavm: completed

+2022-12-20 16:37:54.007: alphavm.system.iso.unit0.disk.server: close disk

+2022-12-20 16:37:54.007: alphavm.system.dka0.unit0.disk.server: close disk

+2022-12-20 16:37:54.027: alphavm.license.rpc: read zero return

+refreshProtection(0x5b090010): 0x5b090000/0x7 (ret=-1/Permission denied)

+Strange SIGSEGV with Access error on 0x5b090010 for 0x5b090010, db=0xffff97457cf8, prot=0x7 (old_addr=(nil))

+refreshProtection(0x5b090010): 0x5b090000/0x7 (ret=-1/Permission denied)

+refreshProtection(0x5b090010): 0x5b090000/0x7 (ret=-1/Permission denied)

+Strange SIGSEGV with Access error on 0x5b090010 for 0x5b090010, db=0xffff97457cf8, prot=0x7 (old_addr=0x5b090010)

+Last calls

+2437|0xffff9b2bec0c: Calling __memcmpeq (/lib64/libc.so.6)(0x5AF46748, 0x5AF46748, 0x8, ...) => return 0x0

+2437|0x411df0: Calling __memcmpeq (/lib64/libc.so.6)(0x5AF46698, 0x5AF46748, 0x8, ...) => return 0xFFFFFFFF

+2437|0x411c65: Calling free (/usr/bin/alphavm_basic.1.5.62)(0x5AF46780, 0xFFFF9AE27FF8, 0x0, ...) => return 0x1

+2437|0x410266: Calling strcmp (/lib64/libc.so.6)("N3axp8ds10_616E", "N3axp8ds10_616E") => return 0x0

+2437|0x410283: Calling strcmp (/lib64/libc.so.6)("N3axp8ds10_616E", "N3axp8ds10_616E") => return 0x0

+2437|0x40e6e1: Calling strcmp (/lib64/libc.so.6)("N3axp8ds10_466E", "N3axp8ds10_616E") => return 0xFFFFFFFFFFFFFF81

+2437|0x411cc9: Calling free (/usr/bin/alphavm_basic.1.5.62)(0x5AF467C0, 0x5AF466F0, 0x0, ...) => return 0x5AF467C0

+2437|0x612bc5: Calling my_pthread_mutex_destroy (/usr/bin/alphavm_basic.1.5.62)(0xCCF658, 0x7D2380, 0x5AF46CD8, ...) => return 0x0

+2437|0x612c8c: Calling free (/usr/bin/alphavm_basic.1.5.62)(0x5AF46730, 0xFFFF9AE28047, 0x5AF46740, ...) => return 0x0

+2437|0xffff9b2bec0c: Calling __memcmpeq (/lib64/libc.so.6)(0x5AF46698, 0x5AF46698, 0x8, ...) => return 0x0

+2437|0xffff9b2bec0c: Calling __memcmpeq (/lib64/libc.so.6)(0x5AF46698, 0x5AF46698, 0x8, ...) => return 0x0

+2437|0x41194c: Calling free (/usr/bin/alphavm_basic.1.5.62)(0x5AF466B0, 0x0, 0x0, ...) => return 0x5AF46698

+2437|0x410266: Calling strcmp (/lib64/libc.so.6)("N3axp8ds10_466E", "N3axp8ds10_466E") => return 0x0

+2437|0x410283: Calling strcmp (/lib64/libc.so.6)("N3axp8ds10_466E", "N3axp8ds10_466E") => return 0x0

+2437|0x411b63: Calling free (/usr/bin/alphavm_basic.1.5.62)(0x5AF466F0, 0x5AF466F0, 0xCD1608, ...) => return 0x5AF466F0

+2437|0xffff9b2bec0c: Calling __memcmpeq (/lib64/libc.so.6)(0x5AF46748, 0x5AF46748, 0x8, ...) => return 0x0

+2437|SIGSEGV @0x5b090010 (???(0x5b090010)) (x64pc=0x4128f1//usr/bin/alphavm_basic.1.5.62:"/usr/bin/alphavm_basic.1.5.62/_ZN3frm11meta_objectIN3axp8ds10_466EN3emu6systemEED1Ev + 49", rsp=0xffff9ae28048, stack=0xffff9a629000:0xffff9ae29000 own=(nil) fp=(nil)), for accessing 0x5b090010 (code=2/prot=7), db=0xffff97457cf8(0x5b090010:0x5b090078/0x4128f1:0x412904//usr/bin/alphavm_basic.1.5.62/_ZN3frm11meta_objectIN3axp8ds10_466EN3emu6systemEED1Ev + 49:clean, hash:57b02bf7/57b02bf7) handler=(nil)

+RAX:0x000000005af46cd8 RCX:0x0000000000000001 RDX:0x000000005af46cd0 RBX:0x0000000000ccf6a0 

+RSP:0x0000ffff9ae28048 RBP:0x0000000000ccf6b8 RSI:0x000000005af46cd8 RDI:0x000000005af46cd0 

+ R8:0x0000000000000001  R9:0x000000005af467c0 R10:0x0000000000800f78 R11:0x0000000000000008 

+R12:0x0000000000000000 R13:0x0000000000000000 R14:0x0000000000000000 R15:0x0000000000000000 

+RSP-0x20:0x0000000000000000 RSP-0x18:0x0000000000000000 RSP-0x10:0x0000000000000000 RSP-0x08:0x00000000004128f1

+RSP+0x00:0x0000000000000000 RSP+0x08:0x0000000000000000 RSP+0x10:0x0000ffff9ae28068 RSP+0x18:0x00000000000300c0

+```