issue-111508-vec-tryinto-array.rs fails spuriously on x86_64-gnu-llvm-19

[nikic]

On https://github.com/rust-lang/rust/pull/130389 this test failed, then passed, then failed. That PR modified rustc_codegen_llvm, so maybe it's a problem with the PR, but...

On https://github.com/rust-lang/rust/pull/130641 the test failed as well. And LLVM update should have no impact on the llvm-19 job, so this is an unrelated failure.

``` failures: ---- [codegen] tests/codegen/issues/issue-111508-vec-tryinto-array.rs stdout ---- error: verification with 'FileCheck' failed status: exit status: 1 command: "/usr/lib/llvm-19/bin/FileCheck" "--input-file" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/codegen/issues/issue-111508-vec-tryinto-array/issue-111508-vec-tryinto-array.ll" "/checkout/tests/codegen/issues/issue-111508-vec-tryinto-array.rs" "--check-prefix=CHECK" "--check-prefix" "NONMSVC" "--allow-unused-prefixes" "--dump-input-context" "100" --- stderr ------------------------------- /checkout/tests/codegen/issues/issue-111508-vec-tryinto-array.rs:12:15: error: CHECK-NOT: excluded string found in input /checkout/tests/codegen/issues/issue-111508-vec-tryinto-array.rs:12:15: error: CHECK-NOT: excluded string found in input // CHECK-NOT: unwrap_failed ^ /checkout/obj/build/x86_64-unknown-linux-gnu/test/codegen/issues/issue-111508-vec-tryinto-array/issue-111508-vec-tryinto-array.ll:162:24: note: found here ; invoke core::result::unwrap_failed Input file: /checkout/obj/build/x86_64-unknown-linux-gnu/test/codegen/issues/issue-111508-vec-tryinto-array/issue-111508-vec-tryinto-array.ll Check file: /checkout/tests/codegen/issues/issue-111508-vec-tryinto-array.rs -dump-input=help explains the following input dump. Input was: <<<<<< . . . . 62: tail call void @__rust_dealloc(ptr noundef nonnull %self4.i.i.i.i3, i64 noundef %_5.i.i.i.i1, i64 noundef 1) #8, !noalias !24 63: br label %"_ZN4core3ptr53drop_in_place$LT$alloc..raw_vec..RawVec$LT$u8$GT$$GT$17hed377cd692cd93b9E.exit4" 64: 65: "_ZN4core3ptr53drop_in_place$LT$alloc..raw_vec..RawVec$LT$u8$GT$$GT$17hed377cd692cd93b9E.exit4": ; preds = %bb4, %"_ZN63_$LT$alloc..alloc..Global$u20$as$u20$core..alloc..Allocator$GT$10deallocate17haca25143c3187b5eE.exit.i.i.i2" 66: ret void 67: } 68: 69: ; as core::fmt::Debug>::fmt 70: ; Function Attrs: nonlazybind uwtable 71: define internal noundef zeroext i1 @"_ZN65_$LT$alloc..vec..Vec$LT$T$C$A$GT$$u20$as$u20$core..fmt..Debug$GT$3fmt17h74264236e2c87ac3E"(ptr noalias nocapture noundef readonly align 8 dereferenceable(24) %self, ptr noalias noundef align 8 dereferenceable(64) %f) unnamed_addr #0 personality ptr @rust_eh_personality { 72: start: 73: %entry.i.i = alloca [8 x i8], align 8 74: %_5.i = alloca [24 x i8], align 8 75: %self1 = load ptr, ptr %self, align 8, !nonnull !3, !noundef !3 76: %0 = getelementptr inbounds i8, ptr %self, i64 16 77: %len = load i64, ptr %0, align 8, !noundef !3 78: call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %_5.i), !noalias !25 79: ; call core::fmt::Formatter::debug_list 80: call void @_ZN4core3fmt9Formatter10debug_list17hf199147076fb70fdE(ptr noalias nocapture noundef nonnull sret([24 x i8]) align 8 dereferenceable(24) %_5.i, ptr noalias noundef nonnull align 8 dereferenceable(64) %f), !noalias !29 81: %_11.i = getelementptr inbounds i8, ptr %self1, i64 %len 82: %1 = icmp eq i64 %len, 0 83: br i1 %1, label %"_ZN48_$LT$$u5b$T$u5d$$u20$as$u20$core..fmt..Debug$GT$3fmt17h96ef84a4d003573dE.exit", label %bb5.i.i 84: 85: bb5.i.i: ; preds = %start, %bb5.i.i 86: %iter.sroa.4.06.i.i = phi ptr [ %_24.i.i.i, %bb5.i.i ], [ %self1, %start ] 87: %_24.i.i.i = getelementptr inbounds i8, ptr %iter.sroa.4.06.i.i, i64 1 88: call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %entry.i.i), !noalias !30 89: store ptr %iter.sroa.4.06.i.i, ptr %entry.i.i, align 8, !noalias !30 90: ; call core::fmt::builders::DebugList::entry 91: %_9.i.i = call noundef align 8 dereferenceable(24) ptr @_ZN4core3fmt8builders9DebugList5entry17h5ff43506cc31f0aaE(ptr noalias noundef nonnull align 8 dereferenceable(24) %_5.i, ptr noundef nonnull align 1 %entry.i.i, ptr noalias noundef nonnull readonly align 8 dereferenceable(32) @vtable.0) 92: call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %entry.i.i), !noalias !30 93: %2 = icmp eq ptr %_24.i.i.i, %_11.i 94: br i1 %2, label %"_ZN48_$LT$$u5b$T$u5d$$u20$as$u20$core..fmt..Debug$GT$3fmt17h96ef84a4d003573dE.exit", label %bb5.i.i 95: 96: "_ZN48_$LT$$u5b$T$u5d$$u20$as$u20$core..fmt..Debug$GT$3fmt17h96ef84a4d003573dE.exit": ; preds = %bb5.i.i, %start 97: ; call core::fmt::builders::DebugList::finish 98: %_0.i = call noundef zeroext i1 @_ZN4core3fmt8builders9DebugList6finish17h36fc81c6d13d2170E(ptr noalias noundef nonnull align 8 dereferenceable(24) %_5.i) 99: call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %_5.i), !noalias !25 100: ret i1 %_0.i 101: } 102: 103: ; Function Attrs: nonlazybind uwtable 104: define noundef i8 @example(ptr noalias nocapture noundef readonly align 8 dereferenceable(24) %a) unnamed_addr #0 personality ptr @rust_eh_personality { 105: start: 106: %e.i = alloca [24 x i8], align 8 107: %_5.sroa.5 = alloca [16 x i8], align 8 108: %0 = getelementptr inbounds i8, ptr %a, i64 16 109: %_2 = load i64, ptr %0, align 8, !noundef !3 110: %1 = icmp eq i64 %_2, 32 111: br i1 %1, label %bb2, label %bb1 112: 113: bb2: ; preds = %start 114: call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %_5.sroa.5) 115: %_5.sroa.0.0.copyload = load ptr, ptr %a, align 8 116: %_5.sroa.5.0.a.sroa_idx = getelementptr inbounds i8, ptr %a, i64 8 117: call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 8 dereferenceable(16) %_5.sroa.5, ptr noundef nonnull align 8 dereferenceable(16) %_5.sroa.5.0.a.sroa_idx, i64 16, i1 false) 118: tail call void @llvm.experimental.noalias.scope.decl(metadata !33) 119: tail call void @llvm.experimental.noalias.scope.decl(metadata !36) 120: %_5.sroa.5.8.sroa_idx = getelementptr inbounds i8, ptr %_5.sroa.5, i64 8 121: %_5.sroa.5.8._5.sroa.5.8._5.sroa.5.8._5.sroa.5.16._3.i = load i64, ptr %_5.sroa.5.8.sroa_idx, align 8 122: %_2.not.i = icmp eq i64 %_5.sroa.5.8._5.sroa.5.8._5.sroa.5.8._5.sroa.5.16._3.i, 32 123: br i1 %_2.not.i, label %bb6.i, label %bb2.i 124: 125: bb6.i: ; preds = %bb2 126: %2 = icmp ne ptr %_5.sroa.0.0.copyload, null 127: tail call void @llvm.assume(i1 %2) 128: %_4.sroa.9.1.self.i.sroa_idx = getelementptr inbounds i8, ptr %_5.sroa.0.0.copyload, i64 15 129: %_4.sroa.9.1.copyload = load i8, ptr %_4.sroa.9.1.self.i.sroa_idx, align 1, !noalias !36 130: %_4.sroa.11.1.self.i.sroa_idx = getelementptr inbounds i8, ptr %_5.sroa.0.0.copyload, i64 24 131: %_4.sroa.11.1.copyload = load i8, ptr %_4.sroa.11.1.self.i.sroa_idx, align 1, !noalias !36 132: tail call void @llvm.experimental.noalias.scope.decl(metadata !38) 133: tail call void @llvm.experimental.noalias.scope.decl(metadata !41) 134: tail call void @llvm.experimental.noalias.scope.decl(metadata !44) 135: tail call void @llvm.experimental.noalias.scope.decl(metadata !47) 136: %_5.sroa.5.0._5.sroa.5.0._5.sroa.5.0._5.sroa.5.8._5.i.i.i.i1.i.i = load i64, ptr %_5.sroa.5, align 8, !alias.scope !50, !noalias !53 137: %3 = icmp eq i64 %_5.sroa.5.0._5.sroa.5.0._5.sroa.5.0._5.sroa.5.8._5.i.i.i.i1.i.i, 0 138: br i1 %3, label %"_ZN4core6result19Result$LT$T$C$E$GT$6unwrap17hbb3c267700404947E.exit", label %"_ZN63_$LT$alloc..alloc..Global$u20$as$u20$core..alloc..Allocator$GT$10deallocate17haca25143c3187b5eE.exit.i.i.i2.i.i" 139: 140: "_ZN63_$LT$alloc..alloc..Global$u20$as$u20$core..alloc..Allocator$GT$10deallocate17haca25143c3187b5eE.exit.i.i.i2.i.i": ; preds = %bb6.i 141: tail call void @__rust_dealloc(ptr noundef nonnull %_5.sroa.0.0.copyload, i64 noundef %_5.sroa.5.0._5.sroa.5.0._5.sroa.5.0._5.sroa.5.8._5.i.i.i.i1.i.i, i64 noundef 1) #8, !noalias !55 142: br label %"_ZN4core6result19Result$LT$T$C$E$GT$6unwrap17hbb3c267700404947E.exit" 143: 144: bb2.i: ; preds = %bb2 145: %4 = lshr i64 %_5.sroa.5.8._5.sroa.5.8._5.sroa.5.8._5.sroa.5.16._3.i, 8 146: %5 = trunc i64 %4 to i8 147: %_5.sroa.5.0._5.sroa.5.0._5.sroa.5.0._5.sroa.5.8._4.sroa.9.8.copyload8 = load i8, ptr %_5.sroa.5, align 8, !alias.scope !56 148: %_5.sroa.5.1.sroa_idx = getelementptr inbounds i8, ptr %_5.sroa.5, i64 1 149: %_5.sroa.5.1._5.sroa.5.1._5.sroa.5.1._5.sroa.5.9._4.sroa.10.8.copyload9 = load i64, ptr %_5.sroa.5.1.sroa_idx, align 1, !alias.scope !56 150: %6 = getelementptr inbounds i8, ptr %a, i64 18 151: call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %_5.sroa.5) 152: call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %e.i), !noalias !57 153: store ptr %_5.sroa.0.0.copyload, ptr %e.i, align 8, !noalias !61 154: %_4.sroa.9.8.e.i.sroa_idx = getelementptr inbounds i8, ptr %e.i, i64 8 155: store i8 %_5.sroa.5.0._5.sroa.5.0._5.sroa.5.0._5.sroa.5.8._4.sroa.9.8.copyload8, ptr %_4.sroa.9.8.e.i.sroa_idx, align 8, !noalias !61 156: %_4.sroa.10.8.e.i.sroa_idx = getelementptr inbounds i8, ptr %e.i, i64 9 157: store i64 %_5.sroa.5.1._5.sroa.5.1._5.sroa.5.1._5.sroa.5.9._4.sroa.10.8.copyload9, ptr %_4.sroa.10.8.e.i.sroa_idx, align 1, !noalias !61 158: %_4.sroa.11.8.e.i.sroa_idx = getelementptr inbounds i8, ptr %e.i, i64 17 159: store i8 %5, ptr %_4.sroa.11.8.e.i.sroa_idx, align 1, !noalias !61 160: %_4.sroa.12.8.e.i.sroa_idx = getelementptr inbounds i8, ptr %e.i, i64 18 161: call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 2 dereferenceable(6) %_4.sroa.12.8.e.i.sroa_idx, ptr noundef nonnull align 2 dereferenceable(6) %6, i64 6, i1 false) 162: ; invoke core::result::unwrap_failed not:12 !~~~~~~~~~~~~ error: no match expected 163: invoke void @_ZN4core6result13unwrap_failed17hd7f53269bdc044c4E(ptr noalias noundef nonnull readonly align 1 @alloc_00ae4b301f7fab8ac9617c03fcbd7274, i64 noundef 43, ptr noundef nonnull align 1 %e.i, ptr noalias noundef nonnull readonly align 8 dereferenceable(32) @vtable.1, ptr noalias noundef nonnull readonly align 8 dereferenceable(24) @alloc_0410cdfd138ae19a754e23f1977af3be) #9 164: to label %unreachable.i unwind label %cleanup.i, !noalias !57 165: 166: cleanup.i: ; preds = %bb2.i 167: %7 = landingpad { ptr, i32 } 168: cleanup 169: call void @llvm.experimental.noalias.scope.decl(metadata !62) 170: call void @llvm.experimental.noalias.scope.decl(metadata !65), !noalias !57 171: call void @llvm.experimental.noalias.scope.decl(metadata !68), !noalias !57 172: call void @llvm.experimental.noalias.scope.decl(metadata !71), !noalias !57 173: %_5.i.i.i.i1.i = load i64, ptr %_4.sroa.9.8.e.i.sroa_idx, align 8, !alias.scope !74, !noalias !77 174: %8 = icmp eq i64 %_5.i.i.i.i1.i, 0 175: br i1 %8, label %bb5.i, label %"_ZN63_$LT$alloc..alloc..Global$u20$as$u20$core..alloc..Allocator$GT$10deallocate17haca25143c3187b5eE.exit.i.i.i2.i" 176: 177: "_ZN63_$LT$alloc..alloc..Global$u20$as$u20$core..alloc..Allocator$GT$10deallocate17haca25143c3187b5eE.exit.i.i.i2.i": ; preds = %cleanup.i 178: %self4.i.i.i.i3.i = load ptr, ptr %e.i, align 8, !alias.scope !74, !noalias !77, !nonnull !3, !noundef !3 179: call void @__rust_dealloc(ptr noundef nonnull %self4.i.i.i.i3.i, i64 noundef %_5.i.i.i.i1.i, i64 noundef 1) #8, !noalias !79 180: br label %bb5.i 181: 182: unreachable.i: ; preds = %bb2.i 183: unreachable 184: 185: bb5.i: ; preds = %"_ZN63_$LT$alloc..alloc..Global$u20$as$u20$core..alloc..Allocator$GT$10deallocate17haca25143c3187b5eE.exit.i.i.i2.i", %cleanup.i 186: resume { ptr, i32 } %7 187: 188: "_ZN4core6result19Result$LT$T$C$E$GT$6unwrap17hbb3c267700404947E.exit": ; preds = %bb6.i, %"_ZN63_$LT$alloc..alloc..Global$u20$as$u20$core..alloc..Allocator$GT$10deallocate17haca25143c3187b5eE.exit.i.i.i2.i.i" 189: call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %_5.sroa.5) 190: %9 = add i8 %_4.sroa.11.1.copyload, %_4.sroa.9.1.copyload 191: br label %bb4 192: 193: bb1: ; preds = %start 194: tail call void @llvm.experimental.noalias.scope.decl(metadata !80) 195: tail call void @llvm.experimental.noalias.scope.decl(metadata !83) 196: tail call void @llvm.experimental.noalias.scope.decl(metadata !86) 197: tail call void @llvm.experimental.noalias.scope.decl(metadata !89) 198: %10 = getelementptr inbounds i8, ptr %a, i64 8 199: %_5.i.i.i.i1.i2 = load i64, ptr %10, align 8, !alias.scope !92, !noalias !95 200: %11 = icmp eq i64 %_5.i.i.i.i1.i2, 0 201: br i1 %11, label %bb4, label %"_ZN63_$LT$alloc..alloc..Global$u20$as$u20$core..alloc..Allocator$GT$10deallocate17haca25143c3187b5eE.exit.i.i.i2.i3" 202: 203: "_ZN63_$LT$alloc..alloc..Global$u20$as$u20$core..alloc..Allocator$GT$10deallocate17haca25143c3187b5eE.exit.i.i.i2.i3": ; preds = %bb1 204: %self4.i.i.i.i3.i4 = load ptr, ptr %a, align 8, !alias.scope !92, !noalias !95, !nonnull !3, !noundef !3 205: tail call void @__rust_dealloc(ptr noundef nonnull %self4.i.i.i.i3.i4, i64 noundef %_5.i.i.i.i1.i2, i64 noundef 1) #8, !noalias !97 206: br label %bb4 207: 208: bb4: ; preds = %"_ZN63_$LT$alloc..alloc..Global$u20$as$u20$core..alloc..Allocator$GT$10deallocate17haca25143c3187b5eE.exit.i.i.i2.i3", %bb1, %"_ZN4core6result19Result$LT$T$C$E$GT$6unwrap17hbb3c267700404947E.exit" 209: %_0.sroa.0.0 = phi i8 [ %9, %"_ZN4core6result19Result$LT$T$C$E$GT$6unwrap17hbb3c267700404947E.exit" ], [ 0, %bb1 ], [ 0, %"_ZN63_$LT$alloc..alloc..Global$u20$as$u20$core..alloc..Allocator$GT$10deallocate17haca25143c3187b5eE.exit.i.i.i2.i3" ] 210: ret i8 %_0.sroa.0.0 211: } 213: ; core::fmt::Formatter::debug_list 213: ; core::fmt::Formatter::debug_list 214: ; Function Attrs: nonlazybind uwtable 215: declare void @_ZN4core3fmt9Formatter10debug_list17hf199147076fb70fdE(ptr dead_on_unwind noalias nocapture noundef writable sret([24 x i8]) align 8 dereferenceable(24), ptr noalias noundef align 8 dereferenceable(64)) unnamed_addr #0 217: ; core::fmt::builders::DebugList::finish 217: ; core::fmt::builders::DebugList::finish 218: ; Function Attrs: nonlazybind uwtable 219: declare noundef zeroext i1 @_ZN4core3fmt8builders9DebugList6finish17h36fc81c6d13d2170E(ptr noalias noundef align 8 dereferenceable(24)) unnamed_addr #0 220: 221: ; core::fmt::num::imp::::fmt 222: ; Function Attrs: nonlazybind uwtable 223: declare noundef zeroext i1 @"_ZN4core3fmt3num3imp51_$LT$impl$u20$core..fmt..Display$u20$for$u20$u8$GT$3fmt17h940c58c89f07b68cE"(ptr noalias noundef readonly align 1 dereferenceable(1), ptr noalias noundef align 8 dereferenceable(64)) unnamed_addr #0 224: 225: ; core::fmt::num::::fmt 226: ; Function Attrs: nonlazybind uwtable 227: declare noundef zeroext i1 @"_ZN4core3fmt3num52_$LT$impl$u20$core..fmt..UpperHex$u20$for$u20$u8$GT$3fmt17h852eb8e15a050d44E"(ptr noalias noundef readonly align 1 dereferenceable(1), ptr noalias noundef align 8 dereferenceable(64)) unnamed_addr #0 228: 229: ; core::fmt::num::::fmt 230: ; Function Attrs: nonlazybind uwtable 231: declare noundef zeroext i1 @"_ZN4core3fmt3num52_$LT$impl$u20$core..fmt..LowerHex$u20$for$u20$u8$GT$3fmt17hf3f04895d4eae71eE"(ptr noalias noundef readonly align 1 dereferenceable(1), ptr noalias noundef align 8 dereferenceable(64)) unnamed_addr #0 232: 233: ; Function Attrs: nounwind nonlazybind uwtable 234: declare noundef range(i32 0, 10) i32 @rust_eh_personality(i32 noundef, i32 noundef range(i32 1, 17), i64 noundef, ptr noundef, ptr noundef) unnamed_addr #1 236: ; core::fmt::builders::DebugList::entry 236: ; core::fmt::builders::DebugList::entry 237: ; Function Attrs: nonlazybind uwtable 238: declare noundef align 8 dereferenceable(24) ptr @_ZN4core3fmt8builders9DebugList5entry17h5ff43506cc31f0aaE(ptr noalias noundef align 8 dereferenceable(24), ptr noundef nonnull align 1, ptr noalias noundef readonly align 8 dereferenceable(32)) unnamed_addr #0 239: 240: ; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) 241: declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2 243: ; core::result::unwrap_failed 243: ; core::result::unwrap_failed 244: ; Function Attrs: cold noinline noreturn nonlazybind uwtable 245: declare void @_ZN4core6result13unwrap_failed17hd7f53269bdc044c4E(ptr noalias noundef nonnull readonly align 1, i64 noundef, ptr noundef nonnull align 1, ptr noalias noundef readonly align 8 dereferenceable(32), ptr noalias noundef readonly align 8 dereferenceable(24)) unnamed_addr #3 246: 247: ; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write) 248: declare void @llvm.assume(i1 noundef) #4 249: 250: ; Function Attrs: nounwind nonlazybind allockind("free") uwtable 251: declare void @__rust_dealloc(ptr allocptr noundef, i64 noundef, i64 noundef) unnamed_addr #5 252: 253: ; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) 254: declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #6 255: 256: ; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) 257: declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #6 258: 259: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: readwrite) 260: declare void @llvm.experimental.noalias.scope.decl(metadata) #7 261: 262: attributes #0 = { nonlazybind uwtable "probe-stack"="inline-asm" "target-cpu"="x86-64" } . . >>>>>> ------------------------------------------ ```

Test: https://github.com/rust-lang/rust/blob/master/tests/codegen/issues/issue-111508-vec-tryinto-array.rs

[nikic]

Also failed in https://github.com/rust-lang/rust/pull/127546#issuecomment-2364835941 and https://github.com/rust-lang/rust/pull/123778#issuecomment-2362465741.

[saethlin]

We should remove this test and reopen the issue, especially if it's true that nobody understands why the codegen improved: https://github.com/rust-lang/rust/issues/111508#issuecomment-1962529985

[nikic]

"Nobody understands" as in "nobody bothered to run a bisect".

This test has been consistently passing with our own LLVM 19 builds, so it's pretty weird that it fails with Ubuntu's.

[workingjubilee]

@nikic is it possible that a commit was merged in the past... uhh... 5 months that fixed a behavior that affects this?

I think that Ubuntu's LLVM 19 may actually be a snapshot from April.

[nikic]

That would certainly be bad -- where did you find that it is from April?

It looks like Ubuntu 24.10 has the final release since yesterday: https://launchpad.net/ubuntu/+source/llvm-toolchain-19/1:19.1.0-1ubuntu1 I can't find a history on their website though.

Possibly just regenerating the docker image will fix this issue.

[nikic]

The log from https://github.com/rust-lang/rust/pull/129974 has:

2024-09-14T18:47:39.7301296Z #10 11.43 Get:213 http://archive.ubuntu.com/ubuntu oracular/universe amd64 llvm-19-dev amd64 1:19.1.0~++rc4-5ubuntu1 [47.3 MB]

So the docker image should currently have rc4, which is close to what our fork currently uses.

[workingjubilee]

ah, I misunderstood something, then. I was looking at their "llvm-toolchain-snapshot" and trying to figure out its relationships to their other llvm repos and which branch would be in use: https://launchpad.net/ubuntu/+source/llvm-toolchain-snapshot

and I was having trouble finding the version string in the log, too. it seems it isn't always printed?

[nikic]

I've tried running this test in a loop in the x86_64-gnu-llvm-19 docker container and it never failed :( So no idea what's going on here.

[workingjubilee]

Yes, I tried similar antics right before I put up the PR to remove it. I actually probably would have left it if I could have reproduced a failure, because then I'd have any hope of it actually being solved by anything except magic.