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Some linker sections are missing when building project with nightly toolchain #130397

Open zzsergant opened 1 week ago

zzsergant commented 1 week ago

I'm using Ubuntu Linux 20.04.

I have a project which build some .c files (lttng tracepoints) in build.rs with cc::Build and link it to executable. In stable version of Rust toolchain everything works fine.

But when compiling it with nightly Rust toolchain some tracepoint data is missing in resulting executable and tracing does not working.

Code

Here is the archive of minimal project which have a link problem on nightly: lttng_link_test.zip

To build the code you may need to install liblttng-ust-dev package. The Rust toolchain is specified in rust-toolchain.toml file of the project.

I tried this code:

> cargo build
> nm target/debug/lttng_link_test | grep tracepoint_ptr

I expected to see this happen:

0000000000057118 d __tracepoint_ptr_hello_world___my_first_tracepoint
0000000000057128 V __tracepoint_ptrs_registered

Instead, this happened: 

0000000000059988 b __tracepoint_ptrs_registered

The __tracepoint_ptr_hello_world___my_first_tracepoint is missing.

Version it worked on

It most recently worked on:

rustc 1.81.0 (eeb90cda1 2024-09-04)
binary: rustc
commit-hash: eeb90cda1969383f56a2637cbd3037bdf598841c
commit-date: 2024-09-04
host: x86_64-unknown-linux-gnu
release: 1.81.0
LLVM version: 18.1.7

Version with regression

rustc 1.83.0-nightly (9b72238eb 2024-09-14)
binary: rustc
commit-hash: 9b72238eb813e9d06e9e9d270168512fbffd7ee7
commit-date: 2024-09-14
host: x86_64-unknown-linux-gnu
release: 1.83.0-nightly
LLVM version: 19.1.0
bjorn3 commented 1 week ago

Does it work on nightly with RUSTFLAGS="-Zlinker-features=-lld"?

zzsergant commented 1 week ago

Does it work on nightly with RUSTFLAGS="-Zlinker-features=-lld"?

yes, it works with that flag on nightly.

bjorn3 commented 1 week ago

What is the output of readelf -aW on the object file that is supposed to provide this symbol?

zzsergant commented 1 week ago

What is the output of readelf -aW on the object file that is supposed to provide this symbol?

Here is output:

``` Offset Info Type Symbol's Value Symbol's Name + Addend 000000000000000e 0000005200000002 R_X86_64_PC32 0000000000000000 __tracepoint_registered - 4 0000000000000017 0000005200000002 R_X86_64_PC32 0000000000000000 __tracepoint_registered - 4 000000000000001d 0000005200000002 R_X86_64_PC32 0000000000000000 __tracepoint_registered - 4 000000000000002c 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 0000000000000038 0000005400000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen - 4 000000000000003f 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 0000000000000046 0000005700000002 R_X86_64_PC32 0000000000000000 tracepoint_destructors_syms_ptr - 4 0000000000000052 0000005600000002 R_X86_64_PC32 0000000000000000 tracepoint_destructors_syms - 4 0000000000000059 0000005700000002 R_X86_64_PC32 0000000000000000 tracepoint_destructors_syms_ptr - 4 0000000000000060 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 0000000000000072 0000005300000002 R_X86_64_PC32 0000000000000000 __tracepoint_ptrs_registered - 4 0000000000000081 0000005700000002 R_X86_64_PC32 0000000000000000 tracepoint_destructors_syms_ptr - 4 0000000000000091 0000005700000002 R_X86_64_PC32 0000000000000000 tracepoint_destructors_syms_ptr - 4 00000000000000a6 0000005700000002 R_X86_64_PC32 0000000000000000 tracepoint_destructors_syms_ptr - 4 00000000000000b5 0000005700000002 R_X86_64_PC32 0000000000000000 tracepoint_destructors_syms_ptr - 4 00000000000000c5 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 00000000000000d0 0000005b00000004 R_X86_64_PLT32 0000000000000000 dlclose - 4 00000000000000e0 0000005c0000002a R_X86_64_REX_GOTPCRELX 0000000000000000 stderr - 4 00000000000000ed 0000000b00000002 R_X86_64_PC32 0000000000000000 .rodata + 5d 00000000000000fa 0000005d00000004 R_X86_64_PLT32 0000000000000000 fprintf - 4 00000000000000ff 0000005e00000004 R_X86_64_PLT32 0000000000000000 abort - 4 0000000000000106 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 0000000000000118 0000005f00000004 R_X86_64_PLT32 0000000000000000 memset - 4 Relocation section '.rela.fini_array' at offset 0x7718 contains 3 entries: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000000000 0000001100000001 R_X86_64_64 0000000000000000 .text.__tracepoints__destroy + 0 0000000000000008 0000001600000001 R_X86_64_64 0000000000000000 .text.__tracepoints__ptrs_destroy + 0 0000000000000010 0000004500000001 R_X86_64_64 0000000000000000 .text.__lttng_events_exit__hello_world + 0 Relocation section '.rela.text.__tracepoints__ptrs_init' at offset 0x7760 contains 39 entries: Offset Info Type Symbol's Value Symbol's Name + Addend 000000000000000f 0000005300000002 R_X86_64_PC32 0000000000000000 __tracepoint_ptrs_registered - 4 0000000000000018 0000005300000002 R_X86_64_PC32 0000000000000000 __tracepoint_ptrs_registered - 4 0000000000000027 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 0000000000000033 0000005400000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen - 4 000000000000003a 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 0000000000000041 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 0000000000000050 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 000000000000005c 0000000b00000002 R_X86_64_PC32 0000000000000000 .rodata + 40 0000000000000061 0000005a00000004 R_X86_64_PLT32 0000000000000000 dlopen - 4 000000000000006b 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 000000000000007e 0000005700000002 R_X86_64_PC32 0000000000000000 tracepoint_destructors_syms_ptr - 4 000000000000008a 0000005600000002 R_X86_64_PC32 0000000000000000 tracepoint_destructors_syms - 4 0000000000000091 0000005700000002 R_X86_64_PC32 0000000000000000 tracepoint_destructors_syms_ptr - 4 0000000000000098 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 00000000000000a2 0000000b00000002 R_X86_64_PC32 0000000000000000 .rodata + 74 00000000000000aa 0000005900000004 R_X86_64_PLT32 0000000000000000 dlsym - 4 00000000000000b4 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 00000000000000bf 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 00000000000000c9 0000000b00000002 R_X86_64_PC32 0000000000000000 .rodata + 8c 00000000000000d1 0000005900000004 R_X86_64_PLT32 0000000000000000 dlsym - 4 00000000000000db 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 00000000000000e6 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 00000000000000f0 0000005700000002 R_X86_64_PC32 0000000000000000 tracepoint_destructors_syms_ptr - 4 00000000000000f7 0000000b00000002 R_X86_64_PC32 0000000000000000 .rodata + ac 00000000000000ff 0000005900000004 R_X86_64_PLT32 0000000000000000 dlsym - 4 0000000000000109 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 0000000000000113 0000000b00000002 R_X86_64_PC32 0000000000000000 .rodata + cf 000000000000011b 0000005900000004 R_X86_64_PLT32 0000000000000000 dlsym - 4 0000000000000125 0000005700000002 R_X86_64_PC32 0000000000000000 tracepoint_destructors_syms_ptr - 4 0000000000000130 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 000000000000013a 0000000b00000002 R_X86_64_PC32 0000000000000000 .rodata + e6 0000000000000142 0000005900000004 R_X86_64_PLT32 0000000000000000 dlsym - 4 000000000000014c 0000005700000002 R_X86_64_PC32 0000000000000000 tracepoint_destructors_syms_ptr - 4 0000000000000155 0000000c00000002 R_X86_64_PC32 0000000000000000 .text.__tracepoint__init_urcu_sym - 4 000000000000015c 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 000000000000016c 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 0000000000000177 000000600000002a R_X86_64_REX_GOTPCRELX 0000000000000000 __stop___tracepoints_ptrs - 4 0000000000000181 000000610000002a R_X86_64_REX_GOTPCRELX 0000000000000000 __start___tracepoints_ptrs - 4 0000000000000197 000000610000002a R_X86_64_REX_GOTPCRELX 0000000000000000 __start___tracepoints_ptrs - 4 Relocation section '.rela.text.__tracepoints__ptrs_destroy' at offset 0x7b08 contains 24 entries: Offset Info Type Symbol's Value Symbol's Name + Addend 000000000000000e 0000005300000002 R_X86_64_PC32 0000000000000000 __tracepoint_ptrs_registered - 4 0000000000000017 0000005300000002 R_X86_64_PC32 0000000000000000 __tracepoint_ptrs_registered - 4 000000000000001d 0000005300000002 R_X86_64_PC32 0000000000000000 __tracepoint_ptrs_registered - 4 000000000000002c 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 0000000000000038 0000005400000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen - 4 000000000000003f 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 0000000000000046 0000005700000002 R_X86_64_PC32 0000000000000000 tracepoint_destructors_syms_ptr - 4 0000000000000052 0000005600000002 R_X86_64_PC32 0000000000000000 tracepoint_destructors_syms - 4 0000000000000059 0000005700000002 R_X86_64_PC32 0000000000000000 tracepoint_destructors_syms_ptr - 4 0000000000000060 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 0000000000000070 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 000000000000007b 000000610000002a R_X86_64_REX_GOTPCRELX 0000000000000000 __start___tracepoints_ptrs - 4 0000000000000087 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 000000000000009a 0000005700000002 R_X86_64_PC32 0000000000000000 tracepoint_destructors_syms_ptr - 4 00000000000000aa 0000005700000002 R_X86_64_PC32 0000000000000000 tracepoint_destructors_syms_ptr - 4 00000000000000ba 0000005300000002 R_X86_64_PC32 0000000000000000 __tracepoint_ptrs_registered - 4 00000000000000c5 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 00000000000000d0 0000005b00000004 R_X86_64_PLT32 0000000000000000 dlclose - 4 00000000000000e0 0000005c0000002a R_X86_64_REX_GOTPCRELX 0000000000000000 stderr - 4 00000000000000ed 0000000b00000002 R_X86_64_PC32 0000000000000000 .rodata + 5d 00000000000000fa 0000005d00000004 R_X86_64_PLT32 0000000000000000 fprintf - 4 00000000000000ff 0000005e00000004 R_X86_64_PLT32 0000000000000000 abort - 4 0000000000000106 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 0000000000000118 0000005f00000004 R_X86_64_PLT32 0000000000000000 memset - 4 Relocation section '.rela__tracepoints' at offset 0x7d48 contains 3 entries: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000000000 0000001800000001 R_X86_64_64 0000000000000000 __tracepoints_strings + 0 0000000000000018 0000006300000001 R_X86_64_64 0000000000000000 __tracepoint_provider_hello_world + 0 0000000000000020 0000000b00000001 R_X86_64_64 0000000000000000 .rodata + 108 Relocation section '.rela__tracepoints_ptrs' at offset 0x7d90 contains 1 entry: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000000000 0000006200000001 R_X86_64_64 0000000000000000 __tracepoint_hello_world___my_first_tracepoint + 0 Relocation section '.rela.text.lib_ring_buffer_ctx_init' at offset 0x7da8 contains 1 entry: Offset Info Type Symbol's Value Symbol's Name + Addend 00000000000000a7 0000005f00000004 R_X86_64_PLT32 0000000000000000 memset - 4 Relocation section '.rela.text.lib_ring_buffer_align_ctx' at offset 0x7dc0 contains 1 entry: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000000023 0000002100000002 R_X86_64_PC32 0000000000000000 .text.lib_ring_buffer_align - 4 Relocation section '.rela.text.__tracepoint_provider_check_hello_world' at offset 0x7dd8 contains 2 entries: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000000005 0000002500000002 R_X86_64_PC32 0000000000000000 .text.__tracepoint_provider_mismatch_hello_world - 4 000000000000000a 0000002500000002 R_X86_64_PC32 0000000000000000 .text.__tracepoint_provider_mismatch_hello_world - 4 Relocation section '.rela.data.rel.ro.local.__event_fields___hello_world___class1' at offset 0x7e08 contains 3 entries: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000000000 0000000b00000001 R_X86_64_64 0000000000000000 .rodata + 166 0000000000000140 0000000b00000001 R_X86_64_64 0000000000000000 .rodata + 177 0000000000000280 0000000b00000001 R_X86_64_64 0000000000000000 .rodata + 187 Relocation section '.rela.text.__event_get_size__hello_world___class1' at offset 0x7e50 contains 3 entries: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000000037 0000002100000002 R_X86_64_PC32 0000000000000000 .text.lib_ring_buffer_align - 4 0000000000000053 0000002100000002 R_X86_64_PC32 0000000000000000 .text.lib_ring_buffer_align - 4 000000000000006f 0000002100000002 R_X86_64_PC32 0000000000000000 .text.lib_ring_buffer_align - 4 Relocation section '.rela.text.__event_prepare_filter_stack__hello_world___class1' at offset 0x7e98 contains 1 entry: Offset Info Type Symbol's Value Symbol's Name + Addend 000000000000008b 0000006400000004 R_X86_64_PLT32 0000000000000000 __stack_chk_fail - 4 Relocation section '.rela.text.__event_probe__hello_world___class1' at offset 0x7eb0 contains 16 entries: Offset Info Type Symbol's Value Symbol's Name + Addend 00000000000000c1 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 00000000000000da 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 0000000000000103 0000001d00000002 R_X86_64_PC32 0000000000000000 .text.cds_list_empty - 4 0000000000000151 0000002f00000002 R_X86_64_PC32 0000000000000000 .text.__event_prepare_filter_stack__hello_world___class1 - 4 0000000000000158 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 00000000000001ca 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 0000000000000259 0000002d00000002 R_X86_64_PC32 0000000000000000 .text.__event_get_size__hello_world___class1 - 4 000000000000027e 0000003100000002 R_X86_64_PC32 0000000000000000 .text.__event_get_align__hello_world___class1 - 4 000000000000029e 0000005f00000004 R_X86_64_PLT32 0000000000000000 memset - 4 00000000000002b3 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 00000000000002d5 0000005500000002 R_X86_64_PC32 0000000000000000 tracepoint_dlopen_ptr - 4 000000000000033c 0000001f00000002 R_X86_64_PC32 0000000000000000 .text.lib_ring_buffer_ctx_init - 4 000000000000039b 0000002300000002 R_X86_64_PC32 0000000000000000 .text.lib_ring_buffer_align_ctx - 4 00000000000003ea 0000002300000002 R_X86_64_PC32 0000000000000000 .text.lib_ring_buffer_align_ctx - 4 0000000000000423 0000002300000002 R_X86_64_PC32 0000000000000000 .text.lib_ring_buffer_align_ctx - 4 000000000000049e 0000006400000004 R_X86_64_PLT32 0000000000000000 __stack_chk_fail - 4 Relocation section '.rela.data.rel.local._loglevel___hello_world___my_first_tracepoint' at offset 0x8030 contains 1 entry: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000000000 0000003700000001 R_X86_64_64 0000000000000000 .rodata._loglevel_value___hello_world___my_first_tracepoint + 0 Relocation section '.rela.data.rel.ro.__event_desc___hello_world_my_first_tracepoint' at offset 0x8048 contains 6 entries: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000000000 0000000b00000001 R_X86_64_64 0000000000000000 .rodata + 190 0000000000000008 0000003300000001 R_X86_64_64 0000000000000000 .text.__event_probe__hello_world___class1 + 0 0000000000000018 0000002b00000001 R_X86_64_64 0000000000000000 .data.rel.ro.local.__event_fields___hello_world___class1 + 0 0000000000000028 0000003900000001 R_X86_64_64 0000000000000000 .data.rel.local._loglevel___hello_world___my_first_tracepoint + 0 0000000000000030 0000003500000001 R_X86_64_64 0000000000000000 .rodata.__tp_event_signature___hello_world___class1 + 0 0000000000000038 0000006800000001 R_X86_64_64 0000000000000000 _model_emf_uri___hello_world___my_first_tracepoint + 0 Relocation section '.rela.data.rel.local.__event_desc___hello_world' at offset 0x80d8 contains 1 entry: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000000000 0000003b00000001 R_X86_64_64 0000000000000000 .data.rel.ro.__event_desc___hello_world_my_first_tracepoint + 0 Relocation section '.rela.data.rel.local.__probe_desc___hello_world' at offset 0x80f0 contains 2 entries: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000000000 0000000b00000001 R_X86_64_64 0000000000000000 .rodata + 1b0 0000000000000008 0000003d00000001 R_X86_64_64 0000000000000000 .data.rel.local.__event_desc___hello_world + 0 Relocation section '.rela.text.__lttng_events_init__hello_world' at offset 0x8120 contains 9 entries: Offset Info Type Symbol's Value Symbol's Name + Addend 000000000000000e 0000004100000002 R_X86_64_PC32 0000000000000000 .bss.__probe_register_refcount___hello_world - 4 0000000000000017 0000004100000002 R_X86_64_PC32 0000000000000000 .bss.__probe_register_refcount___hello_world - 4 0000000000000020 0000002700000002 R_X86_64_PC32 0000000000000000 .text.__tracepoint_provider_check_hello_world - 4 0000000000000027 0000003f00000002 R_X86_64_PC32 0000000000000000 .data.rel.local.__probe_desc___hello_world - 4 000000000000002c 0000006600000004 R_X86_64_PLT32 0000000000000000 lttng_probe_register - 4 000000000000003c 0000005c0000002a R_X86_64_REX_GOTPCRELX 0000000000000000 stderr - 4 0000000000000049 0000000b00000002 R_X86_64_PC32 0000000000000000 .rodata + 1bc 0000000000000056 0000005d00000004 R_X86_64_PLT32 0000000000000000 fprintf - 4 000000000000005b 0000005e00000004 R_X86_64_PLT32 0000000000000000 abort - 4 Relocation section '.rela.text.__lttng_events_exit__hello_world' at offset 0x81f8 contains 5 entries: Offset Info Type Symbol's Value Symbol's Name + Addend 000000000000000a 0000004100000002 R_X86_64_PC32 0000000000000000 .bss.__probe_register_refcount___hello_world - 4 0000000000000013 0000004100000002 R_X86_64_PC32 0000000000000000 .bss.__probe_register_refcount___hello_world - 4 0000000000000019 0000004100000002 R_X86_64_PC32 0000000000000000 .bss.__probe_register_refcount___hello_world - 4 0000000000000024 0000003f00000002 R_X86_64_PC32 0000000000000000 .data.rel.local.__probe_desc___hello_world - 4 0000000000000029 0000006700000004 R_X86_64_PLT32 0000000000000000 lttng_probe_unregister - 4 Relocation section '.rela.debug_info' at offset 0x8270 contains 527 entries: Offset Info Type Symbol's Value Symbol's Name + Addend 0000000000000006 000000490000000a R_X86_64_32 0000000000000000 .debug_abbrev + 0 000000000000000c 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + f4e 0000000000000011 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 6fe 0000000000000015 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 1471 0000000000000019 0000004b0000000a R_X86_64_32 0000000000000000 .debug_ranges + 30 0000000000000025 0000004c0000000a R_X86_64_32 0000000000000000 .debug_line + 0 000000000000002a 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 20 0000000000000038 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + ad3 000000000000003f 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + e74 0000000000000048 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 696 000000000000004f 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 16e5 0000000000000054 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 11a1 0000000000000062 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 590 0000000000000067 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 3cb 0000000000000073 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 12ff 0000000000000081 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 1467 0000000000000086 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 79d 0000000000000092 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 177c 00000000000000aa 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + ca1 00000000000000b6 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 15e8 00000000000000c4 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 45a 00000000000000c9 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + ab5 00000000000000d5 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 121d 00000000000000e1 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 1355 00000000000000f5 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 74f 000000000000010f 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 5df 000000000000011c 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 1037 0000000000000129 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 82b 0000000000000136 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 1607 0000000000000143 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + b75 0000000000000150 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 1d6 000000000000015d 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 173a 000000000000016a 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + d74 0000000000000177 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + e40 0000000000000184 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 13cd 0000000000000191 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 315 000000000000019e 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 1309 00000000000001ab 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 171 00000000000001b8 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 8dc 00000000000001c5 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 355 00000000000001d2 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 164d 00000000000001df 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + b35 00000000000001ec 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + c48 00000000000001f9 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 388 0000000000000206 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 1523 0000000000000213 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 1319 0000000000000220 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 2a1 000000000000022d 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + a54 000000000000023a 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 1096 0000000000000247 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 1655 0000000000000254 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 6ab 0000000000000261 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + 12ad 000000000000026e 0000004d0000000a R_X86_64_32 0000000000000000 .debug_str + f09 000000000000027b 0000004d0000000a 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__event_desc___hello_world 63: 0000000000000000 0 SECTION LOCAL DEFAULT 57 64: 0000000000000000 80 OBJECT LOCAL DEFAULT 57 __probe_desc___hello_world 65: 0000000000000000 0 SECTION LOCAL DEFAULT 59 66: 0000000000000000 4 OBJECT LOCAL DEFAULT 59 __probe_register_refcount___hello_world 67: 0000000000000000 0 SECTION LOCAL DEFAULT 60 68: 0000000000000000 98 FUNC LOCAL DEFAULT 60 __lttng_events_init__hello_world 69: 0000000000000000 0 SECTION LOCAL DEFAULT 62 70: 0000000000000000 50 FUNC LOCAL DEFAULT 62 __lttng_events_exit__hello_world 71: 0000000000000000 0 SECTION LOCAL DEFAULT 64 72: 0000000000000000 0 SECTION LOCAL DEFAULT 65 73: 0000000000000000 0 SECTION LOCAL DEFAULT 67 74: 0000000000000000 0 SECTION LOCAL DEFAULT 68 75: 0000000000000000 0 SECTION LOCAL DEFAULT 70 76: 0000000000000000 0 SECTION LOCAL DEFAULT 72 77: 0000000000000000 0 SECTION LOCAL DEFAULT 74 78: 0000000000000000 0 SECTION LOCAL DEFAULT 76 79: 0000000000000000 0 SECTION LOCAL DEFAULT 77 80: 0000000000000000 0 SECTION LOCAL DEFAULT 78 81: 0000000000000000 0 SECTION LOCAL DEFAULT 75 82: 0000000000000000 4 OBJECT WEAK HIDDEN 4 __tracepoint_registered 83: 0000000000000000 4 OBJECT WEAK HIDDEN 5 __tracepoint_ptrs_registered 84: 0000000000000000 48 OBJECT WEAK HIDDEN 6 tracepoint_dlopen 85: 0000000000000000 8 OBJECT WEAK HIDDEN 7 tracepoint_dlopen_ptr 86: 0000000000000000 24 OBJECT WEAK HIDDEN 8 tracepoint_destructors_syms 87: 0000000000000000 8 OBJECT WEAK HIDDEN 9 tracepoint_destructors_syms_ptr 88: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND _GLOBAL_OFFSET_TABLE_ 89: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND dlsym 90: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND dlopen 91: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND dlclose 92: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND stderr 93: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND fprintf 94: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND abort 95: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND memset 96: 0000000000000000 0 NOTYPE WEAK HIDDEN UND __stop___tracepoints_ptrs 97: 0000000000000000 0 NOTYPE WEAK HIDDEN UND __start___tracepoints_ptrs 98: 0000000000000000 56 OBJECT GLOBAL DEFAULT 26 __tracepoint_hello_world___my_first_tracepoint 99: 0000000000000000 4 OBJECT GLOBAL DEFAULT 64 __tracepoint_provider_hello_world 100: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND __stack_chk_fail 101: 0000000000000000 8 OBJECT GLOBAL HIDDEN 51 _loglevel___hello_world___my_first_tracepoint 102: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND lttng_probe_register 103: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND lttng_probe_unregister 104: 0000000000000000 0 NOTYPE WEAK DEFAULT UND _model_emf_uri___hello_world___my_first_tracepoint No version information found in this file. 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bjorn3 commented 1 week ago

__tracepoint_ptr_hello_world___my_first_tracepoint is a local symbol, I think it ends up in a separate section (-ffunction-sections/-fdata-sections, at least several other symbols do) and there don't seem to be any relocation referencing it. I'm surprised the system linker doesn't omit this symbol too. Note that rustc passes --gc-sections to the linker to remove functions and statics which aren't referenced anywhere nor exported.

zzsergant commented 1 week ago

The __tracepoint_ptr_hello_world___my_first_tracepoint was mentioned as one of the difference between nm symbols of resulting binary when built in stable vs nightly. I'm not sure why exactly it is not working (tracing) when building on nightly. Maybe some other symbol or section is missing in resulting binary on which lltng toolkit is relied.

bjorn3 commented 1 week ago

I don't think this should get the regression-from-stable-to-nightly label. We only enable lld on nightly, right? So it will keep working on stable and beta until we make lld the default there too.

zzsergant commented 1 week ago

After some research I've found an option to link successfully with nightly linker with following flags in .cargo/config.toml:

[target.'cfg(unix)']
rustflags = ["-C", "link-args=-z nostart-stop-gc"]

That way the tracing works with resulting binary and __tracepoint_ptr_hello_world___my_first_tracepoint also stay in it.