On 5/6/20 3:50 PM, Stephen Rothwell wrote: > Hi all, > > On Tue, 14 Apr 2020 17:19:14 -0500 Josh Poimboeuf <jpoimboe@xxxxxxxxxx> wrote: >> >> On Tue, Apr 14, 2020 at 06:50:15AM -0700, Randy Dunlap wrote: >>> On 4/13/20 7:39 PM, Stephen Rothwell wrote: >>>> Hi all, >>>> >>>> Changes since 20200413: >>>> >>> >>> >>> I killed objtool after 49 minutes of CPU time: >>> >>> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND >>> 6159 rdunlap 30 10 42756 8028 0 R 100.0 0.099 49:19.02 objtool >>> >>> >>> /bin/sh: line 1: 6159 Terminated ./tools/objtool/objtool orc generate --no-fp --no-unreachable --uaccess drivers/i2c/busses/i2c-parport.o >> >> I took an initial look at this one. I can dig more tomorrow unless >> Peter beats me to it. >> >> (gdb) bt >> #0 0x000000000040df55 in sec_offset_hash (sec=0xc30930, offset=4334561216) at elf.h:104 >> #1 0x000000000040e907 in find_rela_by_dest_range (elf=0x7ffff64a4010, sec=0xc30930, offset=18446744073709551608, len=1) at elf.c:227 >> #2 0x000000000040ea67 in find_rela_by_dest (elf=0x7ffff64a4010, sec=0xc30710, offset=18446744073709551608) at elf.c:246 >> #3 0x0000000000408038 in find_jump_table (file=0x427620 <file>, func=0xc32bf0, insn=0xc4f840) at check.c:1118 >> #4 0x0000000000408242 in mark_func_jump_tables (file=0x427620 <file>, func=0xc32bf0) at check.c:1170 >> #5 0x00000000004083b6 in add_jump_table_alts (file=0x427620 <file>) at check.c:1215 >> #6 0x0000000000408b95 in decode_sections (file=0x427620 <file>) at check.c:1413 >> #7 0x000000000040bf44 in check (_objname=0x7fffffffceff "drivers/i2c/busses/i2c-parport.o", orc=true) at check.c:2508 >> #8 0x0000000000405580 in cmd_orc (argc=1, argv=0x7fffffffc9d8) at builtin-orc.c:41 >> #9 0x0000000000411297 in handle_internal_command (argc=6, argv=0x7fffffffc9d0) at objtool.c:96 >> #10 0x0000000000411349 in main (argc=6, argv=0x7fffffffc9d0) at objtool.c:119 >> >> It's an infinite loop in find_rela_by_dest_range() because offset is -8. >> That comes from find_jump_table(): >> >> table_offset = text_rela->addend; >> table_sec = text_rela->sym->sec; >> ... >> table_rela = find_rela_by_dest(file->elf, table_sec, table_offset); >> >> which comes from this gem: >> >> 00000000000001fd <line_set>: >> 1fd: 48 b8 00 00 00 00 00 movabs $0x0,%rax >> 204: 00 00 00 >> 1ff: R_X86_64_64 .rodata-0x8 >> >> So objtool is getting confused by that -0x8 rela addend. > > Did this get fixed? > Yes. It's here: https://lore.kernel.org/lkml/02b719674b031800b61e33c30b2e823183627c19.1587842122.git.jpoimboe@xxxxxxxxxx/ -- ~Randy
