In recent kernel build we can see several dwarf info records not connected to actual code address. Like for acpi_ev_default_region_setup function: <1><52a3388>: Abbrev Number: 40 (DW_TAG_subprogram) <52a3389> DW_AT_external : 1 <52a3389> DW_AT_name : (indirect string, offset: 0x221ddf): acpi_ev_default_region_setup <52a338d> DW_AT_decl_file : 23 <52a338e> DW_AT_decl_line : 227 <52a338f> DW_AT_decl_column : 1 <52a3390> DW_AT_prototyped : 1 <52a3390> DW_AT_type : <0x52a0e47> <52a3394> DW_AT_sibling : <0x52a33c9> <1><52b6a4d>: Abbrev Number: 37 (DW_TAG_subprogram) <52b6a4e> DW_AT_external : 1 <52b6a4e> DW_AT_name : (indirect string, offset: 0x221ddf): acpi_ev_default_region_setup <52b6a52> DW_AT_decl_file : 1 <52b6a53> DW_AT_decl_line : 425 <52b6a55> DW_AT_decl_column : 1 <52b6a56> DW_AT_prototyped : 1 <52b6a56> DW_AT_type : <0x52b4191> <52b6a5a> DW_AT_sibling : <0x52b6a93> it's missing low_pc/high_pc/range attribute that would connect it to the code, while the code is actualy there: ffffffff815fdea5 <acpi_ev_default_region_setup>: ffffffff815fdea5: e8 46 49 a6 ff callq ffffffff810627f0 <__fentry__> ffffffff815fdeaa: ff ce dec %esi ffffffff815fdeac: b8 00 00 00 00 mov $0x0,%eax ffffffff815fdeb1: 48 0f 44 d0 cmove %rax,%rdx ffffffff815fdeb5: 48 89 11 mov %rdx,(%rcx) ffffffff815fdeb8: c3 retq $ gcc --version gcc (GCC) 10.2.1 20201005 (Red Hat 10.2.1-5) This might be connected to BZ1889516, at least it started to show in the same time. This bug and BZ1889516 is really crucial for BPF to have correct BTF data generation.
Also note that the whole acpi_ev_default_region_setup code range seems to have disappeared from the .debug_line table.
Created attachment 1723511 [details] preprocessed evrgnini object that contains acpi_ev_default_region_setup
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