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SN6PR1501MB2064.namprd15.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Sep 2021 23:36:02.9333 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 8ae927fe-1255-47a7-a2af-5f3a069daaa2 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 3q/Eix2agEyugkJyUR9h5XCwPaudgKH072QG4hOjZAhSS6JRzQOjwZlQVRhAdITa X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR15MB3966 X-OriginatorOrg: fb.com X-Proofpoint-ORIG-GUID: sIegwqfjsSlRSCQJinqtAsKihgMC4zo0 X-Proofpoint-GUID: sIegwqfjsSlRSCQJinqtAsKihgMC4zo0 Content-Transfer-Encoding: 7bit X-Proofpoint-UnRewURL: 2 URL's were un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.182.1,Aquarius:18.0.790,Hydra:6.0.391,FMLib:17.0.607.475 definitions=2021-09-19_07,2021-09-17_02,2020-04-07_01 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 bulkscore=0 spamscore=0 priorityscore=1501 mlxscore=0 clxscore=1015 impostorscore=0 adultscore=0 malwarescore=0 phishscore=0 mlxlogscore=999 suspectscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2109030001 definitions=main-2109190174 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org On 9/18/21 8:41 AM, Vincent Li wrote: > On Fri, Sep 17, 2021 at 8:00 PM Yonghong Song wrote: >> >> >> >> On 9/17/21 6:34 PM, Vincent Li wrote: >>> Hi, >>> >>> I am supposed to file a bug report in https://bugs.llvm.org/ but the >>> site requires account login, while waiting for my account setup, and >>> since this is related to BPF, I will try my luck here :) >>> >>> This is cilium environment, when I use llvm-objdump to disassemble the >>> bpf_lxc.o like below, it core dumps >>> >>> #llvm-objdump -S -D /var/run/cilium/state/2799/bpf_lxc.o > >>> /home/bpf_lxc-5.4.txt >> >> Any particular reason you are using '-D' here? >> >> "llvm-objdump --help" gives: >> >> --disassemble-all Display assembler mnemonics for the machine >> instructions >> >> --disassemble Display assembler mnemonics for the machine >> instructions >> >> >> -D Alias for --disassemble-all >> >> >> -d Alias for --disassemble >> >> It gives the same description about -D and -d but actually -D tries to >> disassemble *all* sections and -d tries to disassemble *only* executable >> sections. >> >> The following is an example to disassemble a selftest bpf program >> bpf_iter_tcp4.o: >> >> [yhs@devbig003.ftw2 ~/work/bpf-next/tools/testing/selftests/bpf] >> llvm-objdump -D bpf_iter_tcp4.o >& ~/log >> [yhs@devbig003.ftw2 ~/work/bpf-next/tools/testing/selftests/bpf] grep >> "Disassembly of section" ~/log >> Disassembly of section .strtab: >> Disassembly of section iter/tcp: >> Disassembly of section .reliter/tcp: >> Disassembly of section license: >> Disassembly of section .rodata: >> Disassembly of section .debug_loc: >> Disassembly of section .debug_abbrev: >> Disassembly of section .debug_info: >> Disassembly of section .rel.debug_info: >> Disassembly of section .debug_ranges: >> Disassembly of section .debug_str: >> Disassembly of section .BTF: >> Disassembly of section .rel.BTF: >> Disassembly of section .BTF.ext: >> Disassembly of section .rel.BTF.ext: >> Disassembly of section .debug_frame: >> Disassembly of section .rel.debug_frame: >> Disassembly of section .debug_line: >> Disassembly of section .rel.debug_line: >> Disassembly of section .llvm_addrsig: >> Disassembly of section .symtab: >> [yhs@devbig003.ftw2 ~/work/bpf-next/tools/testing/selftests/bpf] >> llvm-objdump -d bpf_iter_tcp4.o >& ~/log >> [yhs@devbig003.ftw2 ~/work/bpf-next/tools/testing/selftests/bpf] grep >> "Disassembly of section" ~/log >> Disassembly of section iter/tcp: >> [yhs@devbig003.ftw2 ~/work/bpf-next/tools/testing/selftests/bpf] >> >> You can see, "-D" tries to disassemble *all* sections and "-d" only >> tries to disassemble "iter/tcp" section which is the *text* section. >> >> I suspect llvm BPF backend may have some loose end which didn't handle >> well for illegal insn, which I will put up a task so we can fix it. >> >> I guess you tries to disassemble for non-text sections because you want >> to compare contents of sections with text file? If this is the case, >> you may want to compare section data directly, because disassemble >> illegal insn will result in "" insn which may hide the >> actual data difference. In any case, it would be good to know what you >> try to do with "-D" result so we may discuss to find a proper solution. >> > > Yonghong, thank you for the detail explanation, it is me not clear > about the usage of > llvm-objdump, should have read the manual or try different argument > before this post, > thought better reporting the crash dump than doing nothing :) No worry. Yes, crash is not good. We will need to fix it. > > Vincent > > >>> >>> PLEASE submit a bug report to https://bugs.llvm.org/ and include the >>> crash backtrace. >>> >>> Stack dump: >>> >>> 0. Program arguments: llvm-objdump -S -D /var/run/cilium/state/2799/bpf_lxc.o >>> >>> #0 0x00000000006336bc llvm::sys::PrintStackTrace(llvm::raw_ostream&, >>> int) (/usr/local/bin/llvm-objdump+0x6336bc) >>> >>> #1 0x00000000006318a4 llvm::sys::RunSignalHandlers() >>> (/usr/local/bin/llvm-objdump+0x6318a4) >>> >>> #2 0x0000000000631efd SignalHandler(int) (/usr/local/bin/llvm-objdump+0x631efd) >>> >>> #3 0x00007f9f39a7fb20 __restore_rt (/lib64/libpthread.so.0+0x12b20) >>> >>> #4 0x0000000000492e8b >>> llvm::BPFInstPrinter::printMemOperand(llvm::MCInst const*, int, >>> llvm::raw_ostream&, char const*) >>> (/usr/local/bin/llvm-objdump+0x492e8b) >>> >>> #5 0x00000000004946c0 llvm::BPFInstPrinter::printInst(llvm::MCInst >>> const*, unsigned long, llvm::StringRef, llvm::MCSubtargetInfo const&, >>> llvm::raw_ostream&) (/usr/local/bin/llvm-objdump+0x4946c0) >>> >>> #6 0x0000000000432351 (anonymous >>> namespace)::BPFPrettyPrinter::printInst(llvm::MCInstPrinter&, >>> llvm::MCInst const*, llvm::ArrayRef, >>> llvm::object::SectionedAddress, llvm::formatted_raw_ostream&, >>> llvm::StringRef, llvm::MCSubtargetInfo const&, (anonymous >>> namespace)::SourcePrinter*, llvm::StringRef, >>> std::vector>> std::allocator >*, (anonymous >>> namespace)::LiveVariablePrinter&) >>> (/usr/local/bin/llvm-objdump+0x432351) >>> >>> #7 0x00000000004400b8 disassembleObject(llvm::Target const*, >>> llvm::object::ObjectFile const*, llvm::MCContext&, >>> llvm::MCDisassembler*, llvm::MCDisassembler*, llvm::MCInstrAnalysis >>> const*, llvm::MCInstPrinter*, llvm::MCSubtargetInfo const*, >>> llvm::MCSubtargetInfo const*, (anonymous namespace)::PrettyPrinter&, >>> (anonymous namespace)::SourcePrinter&, bool) >>> (/usr/local/bin/llvm-objdump+0x4400b8) >>> >>> #8 0x000000000044444e disassembleObject(llvm::object::ObjectFile >>> const*, bool) (/usr/local/bin/llvm-objdump+0x44444e) >>> >>> #9 0x00000000004454e2 dumpObject(llvm::object::ObjectFile*, >>> llvm::object::Archive const*, llvm::object::Archive::Child const*) >>> (/usr/local/bin/llvm-objdump+0x4454e2) >>> >>> #10 0x0000000000409910 main (/usr/local/bin/llvm-objdump+0x409910) >>> >>> #11 0x00007f9f3854c493 __libc_start_main (/lib64/libc.so.6+0x23493) >>> >>> #12 0x000000000042384e _start (/usr/local/bin/llvm-objdump+0x42384e) >>> >>> Segmentation fault (core dumped) >>> >>> I compiled and installed llvm and clang 12.0.1 myself >>>