lldb: address 0x0000000100000000 maps to more than one section #2127
Description
Recently I have started to get strange warnings from wasmtime (HEAD) when running programs using lldb on Darwin. Below is a transcript.
../../llvm/bin/lldb -- target/debug/wasmtime -g sumsX.mo.wasm
(lldb) target create "target/debug/wasmtime"
Current executable set to '/Users/ggreif/motoko/wasmtime/target/debug/wasmtime' (x86_64).
(lldb) settings set -- target.run-args "-g" "sumsX.mo.wasm"
(lldb) b spell
Breakpoint 1: no locations (pending).
WARNING: Unable to resolve breakpoint to any actual locations.
(lldb) r
warning: (x86_64) /Users/ggreif/motoko/wasmtime/target/debug/wasmtime(0x0000000100000000) address 0x0000000100000000 maps to more than one section: wasmtime.__TEXT and wasmtime.__TEXT
warning: (x86_64) /Users/ggreif/motoko/wasmtime/target/debug/wasmtime(0x0000000100000000) address 0x0000000101636000 maps to more than one section: wasmtime.__DATA and wasmtime.__DATA
Process 73083 launched: '/Users/ggreif/motoko/wasmtime/target/debug/wasmtime' (x86_64)
warning: (x86_64) /Users/ggreif/motoko/wasmtime/target/debug/wasmtime(0x0000000100000000) address 0x0000000100000000 maps to more than one section: wasmtime.__TEXT and wasmtime.__TEXT
warning: (x86_64) /Users/ggreif/motoko/wasmtime/target/debug/wasmtime(0x0000000100000000) address 0x0000000101636000 maps to more than one section: wasmtime.__DATA and wasmtime.__DATA
Process 73083 exited with status = 0 (0x00000000)
(lldb) r
warning: (x86_64) /Users/ggreif/motoko/wasmtime/target/debug/wasmtime(0x0000000100000000) address 0x0000000100000000 maps to more than one section: wasmtime.__TEXT and wasmtime.__TEXT
warning: (x86_64) /Users/ggreif/motoko/wasmtime/target/debug/wasmtime(0x0000000100000000) address 0x0000000101636000 maps to more than one section: wasmtime.__DATA and wasmtime.__DATA
Process 73151 launched: '/Users/ggreif/motoko/wasmtime/target/debug/wasmtime' (x86_64)
warning: (x86_64) /Users/ggreif/motoko/wasmtime/target/debug/wasmtime(0x0000000100000000) address 0x0000000100000000 maps to more than one section: wasmtime.__TEXT and wasmtime.__TEXT
warning: (x86_64) /Users/ggreif/motoko/wasmtime/target/debug/wasmtime(0x0000000100000000) address 0x0000000101636000 maps to more than one section: wasmtime.__DATA and wasmtime.__DATA
Process 73151 exited with status = 0 (0x00000000)
(lldb) r
Process 73211 launched: '/Users/ggreif/motoko/wasmtime/target/debug/wasmtime' (x86_64)
warning: (x86_64) /Users/ggreif/motoko/wasmtime/target/debug/wasmtime(0x0000000100000000) address 0x0000000100000000 maps to more than one section: wasmtime.__TEXT and wasmtime.__TEXT
warning: (x86_64) /Users/ggreif/motoko/wasmtime/target/debug/wasmtime(0x0000000100000000) address 0x0000000101636000 maps to more than one section: wasmtime.__DATA and wasmtime.__DATA
Process 73211 exited with status = 0 (0x00000000)
(lldb) r
Process 73238 launched: '/Users/ggreif/motoko/wasmtime/target/debug/wasmtime' (x86_64)
1 location added to breakpoint 1
Process 73238 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
frame #0: 0x0000000104728e51 JIT(0x108100000)`spell(dayX=(null)::tue) at sumsX.mo:36:5
33
34 //func spell (day : Weekday) : Text =
35 func spell (dayX : { #mon; #tue; #wed }) : Text =
-> 36 switch dayX {
37 case (#mon) "Monday";
38 case (#tue) "Tuesday";
39 case _ "Weekend"
(lldb)
As you can see, I needed several attempts until I could enter. I am attaching the sources. The lldb I use is derived from the rust-lang/llvm-project (branch 2020-05). The symptoms appear without setting a breakpoint also, so I don't think they are language specific.