An application that I use and maintain, [matterhorn](https://github.com/matterhorn-chat/matterhorn), is crashing somewhat frequently on macOS Ventura in what appears to be GMP code. Here are the platform details: * macOS version: Ventura 13.0.1 * `uname -a`: `Darwin 000642-jtd.local 22.1.0 Darwin Kernel Version 22.1.0: Sun Oct 9 20:15:09 PDT 2022; root:xnu-8792.41.9~2/RELEASE_ARM64_T6000 arm64` * Chipset: Apple M1 Max * GHC version: 9.4.3 * Cabal and `cabal-install` versions: 3.8.1.0 I don't know for sure, but this might be a duplicate of #22408. These crashes occur seemingly at random. Sometimes the program almost immediately fails to start; at other times it runs for a while before crashing. In all cases, `Bus error: 10` is reported to the console. Here are some crashes recorded from `lldb` along with some additional information in a few cases. Please let me know if there's any additional testing or information that would be helpful! ``` * thread #4, stop reason = EXC_BAD_ACCESS (code=2, address=0x6ffffffff0) frame #0: 0x00000001081da380 matterhorn`__gmpn_lshift + 176 matterhorn`: -> 0x1081da380 <+176>: ldp x4, x5, [x1, #-0x10] 0x1081da384 <+180>: orr x10, x10, x13 0x1081da388 <+184>: orr x11, x12, x2 0x1081da38c <+188>: stp x10, x11, [x16, #-0x10] Target 0: (matterhorn) stopped. ``` ``` * thread #10, name = 'ghc_worker', stop reason = EXC_BAD_ACCESS (code=2, address=0x16bf24000) frame #0: 0x0000000108213174 matterhorn`__gmpn_sub_n + 156 matterhorn`: -> 0x108213174 <+156>: stp x12, x13, [x0], #0x10 0x108213178 <+160>: sub x18, x18, #0x1 0x10821317c <+164>: cbnz x18, 0x108213150 ; <+120> 0x108213180 <+168>: sbcs x12, x6, x10 Target 0: (matterhorn) stopped. ``` ``` * thread #9, name = 'ghc_worker', stop reason = EXC_BAD_ACCESS (code=2, address=0x16db34000) frame #0: 0x0000000106575f30 matterhorn`__gmpn_sqr_diag_addlsh1 + 80 matterhorn`: -> 0x106575f30 <+80>: ldp x4, x5, [x1, #-0x10] 0x106575f34 <+84>: umulh x11, x17, x17 0x106575f38 <+88>: extr x8, x7, x6, #0x3f 0x106575f3c <+92>: stp x12, x13, [x0], #0x10 Target 0: (matterhorn) stopped. ``` ``` * thread #4, stop reason = EXC_BAD_ACCESS (code=2, address=0x6ffffffff0) frame #0: 0x0000000108cfa0a0 matterhorn`__gmpn_lshift + 176 matterhorn`: -> 0x108cfa0a0 <+176>: ldp x4, x5, [x1, #-0x10] 0x108cfa0a4 <+180>: orr x10, x10, x13 0x108cfa0a8 <+184>: orr x11, x12, x2 0x108cfa0ac <+188>: stp x10, x11, [x16, #-0x10] Target 0: (matterhorn) stopped. (lldb) bt * thread #4, stop reason = EXC_BAD_ACCESS (code=2, address=0x6ffffffff0) * frame #0: 0x0000000108cfa0a0 matterhorn`__gmpn_lshift + 176 frame #1: 0x0000000108cee590 matterhorn`integer_gmp_mpn_lshift + 80 frame #2: 0x0000000108d2e598 matterhorn`Lc6z8_info + 52 frame #3: 0x0000000108de0584 matterhorn`schedule(initialCapability=<unavailable>, task=0x0000000109a25898) at Schedule.c:482:13 [opt] ``` ``` * thread #7, name = 'ghc_worker', stop reason = EXC_BAD_ACCESS (code=2, address=0x16d550000) frame #0: 0x0000000106acc3c4 matterhorn`__gmpn_mul_1 + 156 matterhorn`: -> 0x106acc3c4 <+156>: stp x12, x13, [x0, #-0x10] 0x106acc3c8 <+160>: adcs x12, x8, x11 0x106acc3cc <+164>: umulh x11, x5, x3 0x106acc3d0 <+168>: mul x8, x6, x3 Target 0: (matterhorn) stopped. (lldb) bt * thread #7, name = 'ghc_worker', stop reason = EXC_BAD_ACCESS (code=2, address=0x16d550000) * frame #0: 0x0000000106acc3c4 matterhorn`__gmpn_mul_1 + 156 frame #1: 0x0000000106ad3cf4 matterhorn`__gmpn_sqr_basecase + 160 frame #2: 0x0000000106ad5e4c matterhorn`__gmpn_toom2_sqr + 552 frame #3: 0x0000000106ad39e8 matterhorn`__gmpn_sqr + 112 frame #4: 0x0000000106ac175c matterhorn`__gmpn_powm + 3464 frame #5: 0x0000000106ad11a4 matterhorn`__gmpz_powm + 2260 (lldb) thread list Process 91041 stopped thread #1: tid = 0xaf9997, 0x000000019c7225e4 libsystem_kernel.dylib`__psynch_cvwait + 8, name = 'ghc_worker', queue = 'com.apple.main-thread' thread #2: tid = 0xaf99a3, 0x000000019c7223e0 libsystem_kernel.dylib`__semwait_signal + 8 thread #3: tid = 0xaf99a4, 0x000000019c727334 libsystem_kernel.dylib`poll + 8 thread #4: tid = 0xaf99a5, 0x000000019c7225e4 libsystem_kernel.dylib`__psynch_cvwait + 8 thread #5: tid = 0xaf99a6, 0x000000019c724e98 libsystem_kernel.dylib`kevent + 8, name = 'ghc_worker' thread #6: tid = 0xaf99a7, 0x000000019c724e98 libsystem_kernel.dylib`kevent + 8, name = 'ghc_worker' * thread #7: tid = 0xaf99a8, 0x0000000106acc3c4 matterhorn`__gmpn_mul_1 + 156, name = 'ghc_worker', stop reason = EXC_BAD_ACCESS (code=2, address=0x16d550000) thread #8: tid = 0xaf99a9, 0x000000019c7225e4 libsystem_kernel.dylib`__psynch_cvwait + 8 thread #9: tid = 0xaf9e12, 0x000000019c7225e4 libsystem_kernel.dylib`__psynch_cvwait + 8 thread #10: tid = 0xaf9e17, 0x000000019c7225e4 libsystem_kernel.dylib`__psynch_cvwait + 8 ```