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segfault during stage2 build of dist x86_64-apple-darwin xcode 7.3 #48866
Description
Activity
- added 2 commits that reference this issue
on Mar 9, 2018 Also happened on #48757
Reproduced on Travis and the offending artifact should have been uploaded to S3.
Edit: That artifacts segfaults locally.
Details
(lldb) bt * thread #2, name = 'rustc', stop reason = EXC_BAD_ACCESS (code=EXC_I386_GPFLT) * frame #0: 0x000000010162c7e8 librustc-863c36ebb34cad14.dylib`rustc::ich::hcx::_$LT$impl$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc..ich..hcx..StableHashingContext$LT$$u27$a$GT$$GT$$u20$for$u20$syntax_pos..span_encoding..Span$GT$::hash_stable::h8d48a4ca8ec2db40 + 760 frame #1: 0x00000001016373a9 librustc-863c36ebb34cad14.dylib`rustc::ich::impls_syntax::_$LT$impl$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc..ich..hcx..StableHashingContext$LT$$u27$a$GT$$GT$$u20$for$u20$$u5b$syntax..ast..Attribute$u5d$$GT$::hash_stable::hcbeec66e1d823fad + 2681 frame #2: 0x00000001015fe649 librustc-863c36ebb34cad14.dylib`_$LT$rustc..hir..map..collector..HirItemLike$LT$T$GT$$u20$as$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc..ich..hcx..StableHashingContext$LT$$u27$hir$GT$$GT$$GT$::hash_stable::hbcbbaf6c54b1cc3e + 201 frame #3: 0x000000010156ea4c librustc-863c36ebb34cad14.dylib`rustc::dep_graph::graph::DepGraph::with_task::h2676a93b883dbd65 + 2764 frame #4: 0x00000001015fbee2 librustc-863c36ebb34cad14.dylib`_$LT$rustc..hir..map..collector..NodeCollector$LT$$u27$a$C$$u20$$u27$hir$GT$$u20$as$u20$rustc..hir..intravisit..Visitor$LT$$u27$hir$GT$$GT$::visit_item::h8804047228cc6c2e + 338 frame #5: 0x000000010160de38 librustc-863c36ebb34cad14.dylib`rustc::hir::map::map_crate::h81da5cba736e888a + 4744 frame #6: 0x00000001001623a3 librustc_driver-316df4eccf83bc20.dylib`rustc_driver::driver::compile_input::h50b15af9e8f0bc9e + 9907 frame #7: 0x000000010017f60f librustc_driver-316df4eccf83bc20.dylib`rustc_driver::run_compiler::he5fca2bf13208946 + 4479 frame #8: 0x00000001000a7b56 librustc_driver-316df4eccf83bc20.dylib`std::sys_common::backtrace::__rust_begin_short_backtrace::he6dd637274e4e34c + 1046 frame #9: 0x0000000102d997ff libstd-ab14014bac7f480c.dylib`__rust_maybe_catch_panic + 31 frame #10: 0x00000001000e4366 librustc_driver-316df4eccf83bc20.dylib`_$LT$F$u20$as$u20$alloc..boxed..FnBox$LT$A$GT$$GT$::call_box::h3dd84feee2236c8c + 134 frame #11: 0x0000000102d8e41c libstd-ab14014bac7f480c.dylib`std::sys::unix::thread::Thread::new::thread_start::h8d626b697ba2edfb + 140 frame #12: 0x00007fff7a5406c1 libsystem_pthread.dylib`_pthread_body + 340 frame #13: 0x00007fff7a54056d libsystem_pthread.dylib`_pthread_start + 377 frame #14: 0x00007fff7a53fc5d libsystem_pthread.dylib`thread_start + 13 (lldb) disass librustc-863c36ebb34cad14.dylib`rustc::ich::hcx::_$LT$impl$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc..ich..hcx..StableHashingContext$LT$$u27$a$GT$$GT$$u20$for$u20$syntax_pos..span_encoding..Span$GT$::hash_stable::h8d48a4ca8ec2db40: 0x10162c4f0 <+0>: push rbp 0x10162c4f1 <+1>: mov rbp, rsp 0x10162c4f4 <+4>: push r15 0x10162c4f6 <+6>: push r14 0x10162c4f8 <+8>: push r13 0x10162c4fa <+10>: push r12 0x10162c4fc <+12>: push rbx 0x10162c4fd <+13>: sub rsp, 0xc8 0x10162c504 <+20>: mov r14, rdx 0x10162c507 <+23>: mov r12, rsi 0x10162c50a <+26>: mov rbx, rdi 0x10162c50d <+29>: mov qword ptr [rbp - 0x50], r12 0x10162c511 <+33>: cmp byte ptr [r12 + 0xb8], 0x0 0x10162c51a <+42>: je 0x10162c656 ; <+358> 0x10162c520 <+48>: lea rsi, [rip + 0x448879] ; str.1zW + 33680 0x10162c527 <+55>: mov rdi, rbx 0x10162c52a <+58>: call 0x1019dcc2e ; symbol stub for: _$LT$syntax_pos..span_encoding..Span$u20$as$u20$core..cmp..PartialEq$GT$::eq::h0e56e2d603ee2cd2 0x10162c52f <+63>: test al, al 0x10162c531 <+65>: jne 0x10162c637 ; <+327> 0x10162c537 <+71>: mov esi, dword ptr [rbx] 0x10162c539 <+73>: lea rdi, [rbp - 0x48] 0x10162c53d <+77>: call 0x1013c2410 ; syntax_pos::span_encoding::Span::data::h6f31e1db7305e513 0x10162c542 <+82>: mov r15d, dword ptr [rbp - 0x48] 0x10162c546 <+86>: mov r13d, dword ptr [rbp - 0x44] 0x10162c54a <+90>: cmp r13d, r15d 0x10162c54d <+93>: jb 0x10162c637 ; <+327> 0x10162c553 <+99>: lea rbx, [r12 + 0x30] 0x10162c558 <+104>: cmp qword ptr [r12 + 0x30], 0x0 0x10162c55e <+110>: jne 0x10162c5cf ; <+223> 0x10162c560 <+112>: mov rsi, qword ptr [r12 + 0x28] 0x10162c565 <+117>: lea rdi, [rbp - 0xd8] 0x10162c56c <+124>: call 0x10162ba30 ; rustc::ich::caching_codemap_view::CachingCodemapView::new::h8caa73032c4551e5 0x10162c571 <+129>: cmp qword ptr [r12 + 0x30], 0x0 0x10162c577 <+135>: je 0x10162c5b1 ; <+193> 0x10162c579 <+137>: lea rax, [r12 + 0x60] 0x10162c57e <+142>: mov qword ptr [rbp - 0x30], rax 0x10162c582 <+146>: lea rdi, [r12 + 0x48] 0x10162c587 <+151>: call 0x10141e640 ; core::ptr::drop_in_place::h756bf3ffd5133862 0x10162c58c <+156>: lea rax, [r12 + 0x88] 0x10162c594 <+164>: mov qword ptr [rbp - 0x30], rax 0x10162c598 <+168>: lea rdi, [r12 + 0x70] 0x10162c59d <+173>: call 0x10141e640 ; core::ptr::drop_in_place::h756bf3ffd5133862 0x10162c5a2 <+178>: add r12, 0x98 0x10162c5a9 <+185>: mov rdi, r12 0x10162c5ac <+188>: call 0x10141e640 ; core::ptr::drop_in_place::h756bf3ffd5133862 0x10162c5b1 <+193>: lea rsi, [rbp - 0xd8] 0x10162c5b8 <+200>: mov edx, 0x88 0x10162c5bd <+205>: mov rdi, rbx 0x10162c5c0 <+208>: call 0x1019dd246 ; symbol stub for: memcpy 0x10162c5c5 <+213>: cmp qword ptr [rbx], 0x0 0x10162c5c9 <+217>: je 0x10162c8bd ; <+973> 0x10162c5cf <+223>: lea rdi, [rbp - 0xf0] 0x10162c5d6 <+230>: mov rsi, rbx 0x10162c5d9 <+233>: mov edx, r15d 0x10162c5dc <+236>: call 0x10162bbd0 ; rustc::ich::caching_codemap_view::CachingCodemapView::byte_pos_to_line_and_col::hf3c0193086c7751b 0x10162c5e1 <+241>: mov r12, qword ptr [rbp - 0xf0] 0x10162c5e8 <+248>: test r12, r12 0x10162c5eb <+251>: je 0x10162c637 ; <+327> 0x10162c5ed <+253>: mov rbx, qword ptr [rbp - 0xe8] 0x10162c5f4 <+260>: movzx eax, byte ptr [rbp - 0xe0] 0x10162c5fb <+267>: mov qword ptr [rbp - 0x38], r12 0x10162c5ff <+271>: cmp dword ptr [r12 + 0x104], r13d 0x10162c607 <+279>: ja 0x10162c613 ; <+291> 0x10162c609 <+281>: cmp dword ptr [r12 + 0x108], r13d 0x10162c611 <+289>: jae 0x10162c668 ; <+376> 0x10162c613 <+291>: mov byte ptr [rbp - 0xd8], 0x1 0x10162c61a <+298>: lea rsi, [rbp - 0xd8] 0x10162c621 <+305>: mov edx, 0x1 0x10162c626 <+310>: mov rdi, r14 0x10162c629 <+313>: call 0x1013cea80 ; rustc_data_structures::sip128::SipHasher128::short_write::hddbede9409661ad5 0x10162c62e <+318>: inc qword ptr [r14 + 0x48] 0x10162c632 <+322>: jmp 0x10162c7cc ; <+732> 0x10162c637 <+327>: mov byte ptr [rbp - 0xd8], 0x1 0x10162c63e <+334>: lea rsi, [rbp - 0xd8] 0x10162c645 <+341>: mov edx, 0x1 0x10162c64a <+346>: mov rdi, r14 0x10162c64d <+349>: call 0x1013cea80 ; rustc_data_structures::sip128::SipHasher128::short_write::hddbede9409661ad5 0x10162c652 <+354>: inc qword ptr [r14 + 0x48] 0x10162c656 <+358>: add rsp, 0xc8 0x10162c65d <+365>: pop rbx 0x10162c65e <+366>: pop r12 0x10162c660 <+368>: pop r13 0x10162c662 <+370>: pop r14 0x10162c664 <+372>: pop r15 0x10162c666 <+374>: pop rbp 0x10162c667 <+375>: ret 0x10162c668 <+376>: mov dword ptr [rbp - 0x30], eax 0x10162c66b <+379>: mov byte ptr [rbp - 0xd8], 0x0 0x10162c672 <+386>: lea rsi, [rbp - 0xd8] 0x10162c679 <+393>: mov edx, 0x1 0x10162c67e <+398>: mov rdi, r14 0x10162c681 <+401>: call 0x1013cea80 ; rustc_data_structures::sip128::SipHasher128::short_write::hddbede9409661ad5 0x10162c686 <+406>: inc qword ptr [r14 + 0x48] 0x10162c68a <+410>: mov rax, qword ptr [r12 + 0xf0] 0x10162c692 <+418>: mov qword ptr [rbp - 0xd8], rax 0x10162c699 <+425>: lea rsi, [rbp - 0xd8] 0x10162c6a0 <+432>: mov edx, 0x8 0x10162c6a5 <+437>: mov rdi, r14 0x10162c6a8 <+440>: call 0x1013cea80 ; rustc_data_structures::sip128::SipHasher128::short_write::hddbede9409661ad5 0x10162c6ad <+445>: add qword ptr [r14 + 0x48], 0x8 0x10162c6b2 <+450>: mov edi, r13d 0x10162c6b5 <+453>: mov esi, r15d 0x10162c6b8 <+456>: call 0x1019dcc04 ; symbol stub for: _$LT$syntax_pos..BytePos$u20$as$u20$core..ops..arith..Sub$GT$::sub::hdb689f5a05767d93 0x10162c6bd <+461>: and rbx, 0xffffff 0x10162c6c4 <+468>: shl rbx, 0x8 0x10162c6c8 <+472>: mov ecx, dword ptr [rbp - 0x30] 0x10162c6cb <+475>: or rcx, rbx 0x10162c6ce <+478>: shl rax, 0x20 0x10162c6d2 <+482>: or rax, rcx 0x10162c6d5 <+485>: mov qword ptr [rbp - 0xd8], rax 0x10162c6dc <+492>: lea rsi, [rbp - 0xd8] 0x10162c6e3 <+499>: mov edx, 0x8 0x10162c6e8 <+504>: mov rdi, r14 0x10162c6eb <+507>: call 0x1013cea80 ; rustc_data_structures::sip128::SipHasher128::short_write::hddbede9409661ad5 0x10162c6f0 <+512>: add qword ptr [r14 + 0x48], 0x8 0x10162c6f5 <+517>: cmp dword ptr [rbp - 0x40], 0x0 0x10162c6f9 <+521>: je 0x10162c7a8 ; <+696> 0x10162c6ff <+527>: mov byte ptr [rbp - 0xd8], 0x0 0x10162c706 <+534>: lea rsi, [rbp - 0xd8] 0x10162c70d <+541>: mov edx, 0x1 0x10162c712 <+546>: mov rdi, r14 0x10162c715 <+549>: call 0x1013cea80 ; rustc_data_structures::sip128::SipHasher128::short_write::hddbede9409661ad5 0x10162c71a <+554>: inc qword ptr [r14 + 0x48] 0x10162c71e <+558>: lea rdi, [rip + 0x4f723b] ; rustc::ich::hcx::_$LT$impl$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc..ich..hcx..StableHashingContext$LT$$u27$a$GT$$GT$$u20$for$u20$syntax_pos..span_encoding..Span$GT$::hash_stable::CACHE::__getit::__KEY::h765db91289e6600a 0x10162c725 <+565>: call qword ptr [rdi] 0x10162c727 <+567>: cmp byte ptr [rax + 0x21], 0x0 0x10162c72b <+571>: jne 0x10162c8cb ; <+987> 0x10162c731 <+577>: lea rdi, [rip + 0x4f7228] ; rustc::ich::hcx::_$LT$impl$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc..ich..hcx..StableHashingContext$LT$$u27$a$GT$$GT$$u20$for$u20$syntax_pos..span_encoding..Span$GT$::hash_stable::CACHE::__getit::__KEY::h765db91289e6600a 0x10162c738 <+584>: call qword ptr [rdi] 0x10162c73a <+586>: cmp byte ptr [rax + 0x20], 0x0 0x10162c73e <+590>: jne 0x10162c765 ; <+629> 0x10162c740 <+592>: lea rdi, [rip + 0x4f7219] ; rustc::ich::hcx::_$LT$impl$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc..ich..hcx..StableHashingContext$LT$$u27$a$GT$$GT$$u20$for$u20$syntax_pos..span_encoding..Span$GT$::hash_stable::CACHE::__getit::__KEY::h765db91289e6600a 0x10162c747 <+599>: call qword ptr [rdi] 0x10162c749 <+601>: lea rsi, [rip - 0x2513f0] ; std::thread::local::fast::destroy_value::h795e0dcafb24f001 0x10162c750 <+608>: mov rdi, rax 0x10162c753 <+611>: call 0x1019dcdc0 ; symbol stub for: std::sys::unix::fast_thread_local::register_dtor::h4e4cabb233ebf8c9 0x10162c758 <+616>: lea rdi, [rip + 0x4f7201] ; rustc::ich::hcx::_$LT$impl$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc..ich..hcx..StableHashingContext$LT$$u27$a$GT$$GT$$u20$for$u20$syntax_pos..span_encoding..Span$GT$::hash_stable::CACHE::__getit::__KEY::h765db91289e6600a 0x10162c75f <+623>: call qword ptr [rdi] 0x10162c761 <+625>: mov byte ptr [rax + 0x20], 0x1 0x10162c765 <+629>: lea rdi, [rip + 0x4f71f4] ; rustc::ich::hcx::_$LT$impl$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc..ich..hcx..StableHashingContext$LT$$u27$a$GT$$GT$$u20$for$u20$syntax_pos..span_encoding..Span$GT$::hash_stable::CACHE::__getit::__KEY::h765db91289e6600a 0x10162c76c <+636>: call qword ptr [rdi] 0x10162c76e <+638>: cmp qword ptr [rax + 0x18], 0x0 0x10162c773 <+643>: je 0x10162c7da ; <+746> 0x10162c775 <+645>: lea rdi, [rip + 0x4f71e4] ; rustc::ich::hcx::_$LT$impl$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc..ich..hcx..StableHashingContext$LT$$u27$a$GT$$GT$$u20$for$u20$syntax_pos..span_encoding..Span$GT$::hash_stable::CACHE::__getit::__KEY::h765db91289e6600a 0x10162c77c <+652>: call qword ptr [rdi] 0x10162c77e <+654>: lea rdi, [rbp - 0x48] 0x10162c782 <+658>: lea rsi, [rbp - 0x50] 0x10162c786 <+662>: mov rdx, rax 0x10162c789 <+665>: call 0x10162c940 ; rustc::ich::hcx::_$LT$impl$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc..ich..hcx..StableHashingContext$LT$$u27$a$GT$$GT$$u20$for$u20$syntax_pos..span_encoding..Span$GT$::hash_stable::_$u7b$$u7b$closure$u7d$$u7d$::h3094acc762e79e5f 0x10162c78e <+670>: mov qword ptr [rbp - 0xd8], rax 0x10162c795 <+677>: mov ebx, 0x8 0x10162c79a <+682>: lea rsi, [rbp - 0xd8] 0x10162c7a1 <+689>: mov edx, 0x8 0x10162c7a6 <+694>: jmp 0x10162c7c0 ; <+720> 0x10162c7a8 <+696>: mov byte ptr [rbp - 0xd8], 0x1 0x10162c7af <+703>: mov ebx, 0x1 0x10162c7b4 <+708>: lea rsi, [rbp - 0xd8] 0x10162c7bb <+715>: mov edx, 0x1 0x10162c7c0 <+720>: mov rdi, r14 0x10162c7c3 <+723>: call 0x1013cea80 ; rustc_data_structures::sip128::SipHasher128::short_write::hddbede9409661ad5 0x10162c7c8 <+728>: add qword ptr [r14 + 0x48], rbx 0x10162c7cc <+732>: lea rdi, [rbp - 0x38] 0x10162c7d0 <+736>: call 0x10141e640 ; core::ptr::drop_in_place::h756bf3ffd5133862 0x10162c7d5 <+741>: jmp 0x10162c656 ; <+358> 0x10162c7da <+746>: call 0x1019dcd30 ; symbol stub for: std::collections::hash::map::DefaultResizePolicy::new::h7e59c95758f35a6c 0x10162c7df <+751>: lea rdi, [rip + 0x4f717a] ; rustc::ich::hcx::_$LT$impl$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc..ich..hcx..StableHashingContext$LT$$u27$a$GT$$GT$$u20$for$u20$syntax_pos..span_encoding..Span$GT$::hash_stable::CACHE::__getit::__KEY::h765db91289e6600a 0x10162c7e6 <+758>: call qword ptr [rdi] -> 0x10162c7e8 <+760>: movdqa xmm0, xmmword ptr [rax] 0x10162c7ec <+764>: movdqa xmm1, xmmword ptr [rax + 0x10] 0x10162c7f1 <+769>: mov rcx, -0x1 0x10162c7f8 <+776>: movq xmm2, rcx 0x10162c7fd <+781>: pslldq xmm2, 0x8 ; xmm2 = zero,zero,zero,zero,zero,zero,zero,zero,xmm2[0,1,2,3,4,5,6,7] 0x10162c802 <+786>: movdqa xmmword ptr [rax], xmm2 0x10162c806 <+790>: mov ecx, 0x1 0x10162c80b <+795>: movq xmm2, rcx 0x10162c810 <+800>: pslldq xmm2, 0x8 ; xmm2 = zero,zero,zero,zero,zero,zero,zero,zero,xmm2[0,1,2,3,4,5,6,7] 0x10162c815 <+805>: movdqa xmmword ptr [rax + 0x10], xmm2 0x10162c81a <+810>: pshufd xmm1, xmm1, 0x4e ; xmm1 = xmm1[2,3,0,1] 0x10162c81f <+815>: movq rbx, xmm1 0x10162c824 <+820>: test rbx, rbx 0x10162c827 <+823>: je 0x10162c775 ; <+645> 0x10162c82d <+829>: pshufd xmm0, xmm0, 0x4e ; xmm0 = xmm0[2,3,0,1] 0x10162c832 <+834>: movq rcx, xmm0 0x10162c837 <+839>: inc rcx 0x10162c83a <+842>: je 0x10162c775 ; <+645> 0x10162c840 <+848>: lea rsi, [8*rcx] 0x10162c848 <+856>: shl rcx, 0x4 0x10162c84c <+860>: lea rdi, [rbp - 0xd8] 0x10162c853 <+867>: mov edx, 0x8 0x10162c858 <+872>: mov r8d, 0x8 0x10162c85e <+878>: call 0x1019dcd36 ; symbol stub for: std::collections::hash::table::calculate_allocation::h80671a357bb87ea0 0x10162c863 <+883>: mov rdx, qword ptr [rbp - 0xd8] 0x10162c86a <+890>: mov rsi, qword ptr [rbp - 0xd0] 0x10162c871 <+897>: mov rax, rdx 0x10162c874 <+900>: neg rax 0x10162c877 <+903>: cmp rsi, rax 0x10162c87a <+906>: ja 0x10162c8d2 ; <+994> 0x10162c87c <+908>: lea rax, [rdx - 0x1] 0x10162c880 <+912>: mov rcx, rdx 0x10162c883 <+915>: or rcx, -0x80000000 0x10162c88a <+922>: and rcx, rax 0x10162c88d <+925>: jne 0x10162c8d2 ; <+994> 0x10162c88f <+927>: and rbx, -0x2 0x10162c893 <+931>: mov rdi, rbx 0x10162c896 <+934>: call 0x1019bf7e0 ; __rust_dealloc 0x10162c89b <+939>: lea rdi, [rip + 0x4f70be] ; rustc::ich::hcx::_$LT$impl$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc..ich..hcx..StableHashingContext$LT$$u27$a$GT$$GT$$u20$for$u20$syntax_pos..span_encoding..Span$GT$::hash_stable::CACHE::__getit::__KEY::h765db91289e6600a 0x10162c8a2 <+946>: call qword ptr [rdi] 0x10162c8a4 <+948>: cmp qword ptr [rax + 0x18], 0x0 0x10162c8a9 <+953>: jne 0x10162c775 ; <+645> 0x10162c8af <+959>: lea rdi, [rip + 0x4e3ada] 0x10162c8b6 <+966>: call 0x1019dd04e ; symbol stub for: core::panicking::panic::h09bcda4b57fcbe39 0x10162c8bb <+971>: jmp 0x10162c8de ; <+1006> 0x10162c8bd <+973>: lea rdi, [rip + 0x4e3acc] 0x10162c8c4 <+980>: call 0x1019dd04e ; symbol stub for: core::panicking::panic::h09bcda4b57fcbe39 0x10162c8c9 <+985>: ud2 0x10162c8cb <+987>: call 0x101493c10 ; core::result::unwrap_failed::hdc4d27fde799a2d6 0x10162c8d0 <+992>: jmp 0x10162c8de ; <+1006> 0x10162c8d2 <+994>: lea rdi, [rip + 0x4e3ab7] 0x10162c8d9 <+1001>: call 0x1019dd04e ; symbol stub for: core::panicking::panic::h09bcda4b57fcbe39 0x10162c8de <+1006>: ud2 0x10162c8e0 <+1008>: jmp 0x10162c8e4 ; <+1012> 0x10162c8e2 <+1010>: jmp 0x10162c8e4 ; <+1012> 0x10162c8e4 <+1012>: mov r14, rax 0x10162c8e7 <+1015>: lea rdi, [rbp - 0x38] 0x10162c8eb <+1019>: call 0x10141e640 ; core::ptr::drop_in_place::h756bf3ffd5133862 0x10162c8f0 <+1024>: jmp 0x10162c932 ; <+1090> 0x10162c8f2 <+1026>: jmp 0x10162c91b ; <+1067> 0x10162c8f4 <+1028>: mov r15, qword ptr [rbp - 0x30] 0x10162c8f8 <+1032>: mov r14, rax 0x10162c8fb <+1035>: add r12, 0xb0 0x10162c902 <+1042>: mov rdi, r15 0x10162c905 <+1045>: call 0x1014095b0 ; core::ptr::drop_in_place::h307e3bf3d12d15ea 0x10162c90a <+1050>: mov rax, r15 0x10162c90d <+1053>: add rax, 0x28 0x10162c911 <+1057>: mov r15, rax 0x10162c914 <+1060>: cmp r12, rax 0x10162c917 <+1063>: jne 0x10162c902 ; <+1042> 0x10162c919 <+1065>: jmp 0x10162c91e ; <+1070> 0x10162c91b <+1067>: mov r14, rax 0x10162c91e <+1070>: lea rsi, [rbp - 0xd8] 0x10162c925 <+1077>: mov edx, 0x88 0x10162c92a <+1082>: mov rdi, rbx 0x10162c92d <+1085>: call 0x1019dd246 ; symbol stub for: memcpy 0x10162c932 <+1090>: mov rdi, r14 0x10162c935 <+1093>: call 0x1019dd1b0 ; symbol stub for: _Unwind_Resume 0x10162c93a <+1098>: ud2 0x10162c93c <+1100>: nop dword ptr [rax]From the stack trace it is obviously caused by the
CACHETLS. The segfault happens during initialization of theCACHEi.e. when the HashMap was first created.The instruction throwing the error is
(lldb) fr sel 0 frame #0: 0x000000010162c7e8 librustc-863c36ebb34cad14.dylib`rustc::ich::hcx::_$LT$impl$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc..ich..hcx..StableHashingContext$LT$$u27$a$GT$$GT$$u20$for$u20$syntax_pos..span_encoding..Span$GT$::hash_stable::h8d48a4ca8ec2db40 + 760 librustc-863c36ebb34cad14.dylib`rustc::ich::hcx::_$LT$impl$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc..ich..hcx..StableHashingContext$LT$$u27$a$GT$$GT$$u20$for$u20$syntax_pos..span_encoding..Span$GT$::hash_stable::h8d48a4ca8ec2db40: -> 0x10162c7e8 <+760>: movdqa xmm0, xmmword ptr [rax] 0x10162c7ec <+764>: movdqa xmm1, xmmword ptr [rax + 0x10] 0x10162c7f1 <+769>: mov rcx, -0x1 0x10162c7f8 <+776>: movq xmm2, rcxwhere
raxis not aligned on the 16-byte boundary. Thus the segfault is caused by unaligned access in themovdqainstruction.(lldb) x $rax 0x104211488: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0x104211498: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................The
raxshould be the address of the CACHE. I don't know why it needs to be aligned, and why it isn't aligned in stage2.If you've got a Mac you may try to debug it yourself. There's no line info though.
- Stage 1 artifact: https://s3-us-west-1.amazonaws.com/rust-lang-ci2/rustc-builds-alt/7ad66eb8422bc359b0c8a1564dd9339380a6985f/stage1.xz
- Stage 2 artifact: https://s3-us-west-1.amazonaws.com/rust-lang-ci2/rustc-builds-alt/7ad66eb8422bc359b0c8a1564dd9339380a6985f/stage2.xz
Also, we may be switching to Xcode 9 for dist in #48891, and that bug might go away naturally 🤔
I'll still check why it isn't aligned. This is something I can check on Linux
Reacted by kennytmI give up. There's absolutely no reason the address of
CACHEshould ever be stored without alignment.Reacted by kennytmI think this was fixed with the xcode 9 updates, so presuambly this was a linker bug?
- added a commit that references this issue
on Jun 28, 2018
So far not reproducible on newer xcode versions.
cc @varkor @kennytm
52dec0e obviously did not fix it and can be reverted.
Happens inside
whenever it happens, but it's random during which crate's compilation it happens or whether it occurs at all.
Guesses so far are
Span, which isrepr(packed)and only has au32fieldCACHEthread_local (just because miri touched statics)Is is possible to produce better stacktraces (with line info e.g.) on macs?