dyung wrote: We are also seeing the test `Parser/parser_overflow.c` failing when run with ASan or UBSan. Running with `-fbracket-depth` options, I find that on my linux box, the test starts to segfault when the value is >= 1022: ``` dyung@aldebaran:~/src/upstream/llvm_clean_git/clang/test/Parser$ ~/src/upstream/7597e09-linux/bin/clang -fsyntax-only -DHUGE 2>&1 parser_overflow.c -fbracket-depth=1021 parser_overflow.c:11:1025: fatal error: bracket nesting level exceeded maximum of 1021 parser_overflow.c:11:1025: note: use -fbracket-depth=N to increase maximum nesting level 1 error generated.
dyung@aldebaran:~/src/upstream/llvm_clean_git/clang/test/Parser$ ~/src/upstream/7597e09-linux/bin/clang -fsyntax-only -DHUGE 2>&1 parser_overflow.c -fbracket-depth=1022 Segmentation fault (core dumped) ``` The test when run as-is with the ASan enabled compiler produces a stack trace that looks like this (snipped for brevity): ``` PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script. Stack dump: 0. Program arguments: /home/dyung/src/upstream/7597e09-linux/bin/clang -cc1 -internal-isystem /home/dyung/src/upstream/7597e09-linux/lib/clang/20/include -nostdsysteminc /home/dyung/src/upstream/llvm_clean_git/clang/test/Parser/parser_overflow.c -fsyntax-only -DHUGE 1. /home/dyung/src/upstream/llvm_clean_git/clang/test/Parser/parser_overflow.c:11:1028: current parser token '{' 2. /home/dyung/src/upstream/llvm_clean_git/clang/test/Parser/parser_overflow.c:8:16: parsing function body 'foo' 3. /home/dyung/src/upstream/llvm_clean_git/clang/test/Parser/parser_overflow.c:8:16: in compound statement ('{}') 4. /home/dyung/src/upstream/llvm_clean_git/clang/test/Parser/parser_overflow.c:11:5: in compound statement ('{}') 5. /home/dyung/src/upstream/llvm_clean_git/clang/test/Parser/parser_overflow.c:11:6: in compound statement ('{}') ... 1024. /home/dyung/src/upstream/llvm_clean_git/clang/test/Parser/parser_overflow.c:11:1025: in compound statement ('{}') 1025. /home/dyung/src/upstream/llvm_clean_git/clang/test/Parser/parser_overflow.c:11:1026: in compound statement ('{}') 1026. /home/dyung/src/upstream/llvm_clean_git/clang/test/Parser/parser_overflow.c:11:1027: in compound statement ('{}') #0 0x00007fd6fc4d4d40 __interceptor_backtrace.part.0 /build/gcc-9-9QDOt0/gcc-9-9.4.0/build/x86_64-linux-gnu/libsanitizer/asan/../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:4022:28 #1 0x0000558bf98f07e2 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/dyung/src/upstream/7597e09-linux/bin/clang+0x93707e2) #2 0x0000558bf98e0dbf llvm::sys::RunSignalHandlers() (/home/dyung/src/upstream/7597e09-linux/bin/clang+0x9360dbf) #3 0x0000558bf98e1585 SignalHandler(int) Signals.cpp:0:0 #4 0x00007fd6fc459420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420) #5 0x0000558c0531a96c clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/home/dyung/src/upstream/7597e09-linux/bin/clang+0x14d9a96c) #6 0x0000558c05323ce3 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/home/dyung/src/upstream/7597e09-linux/bin/clang+0x14da3ce3) #7 0x0000558c05328f3f clang::Parser::ParseCompoundStatementBody(bool) (/home/dyung/src/upstream/7597e09-linux/bin/clang+0x14da8f3f) #8 0x0000558c0532acfd clang::Parser::ParseCompoundStatement(bool, unsigned int) (/home/dyung/src/upstream/7597e09-linux/bin/clang+0x14daacfd) #9 0x0000558c0531af45 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/home/dyung/src/upstream/7597e09-linux/bin/clang+0x14d9af45) #10 0x0000558c05323ce3 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/home/dyung/src/upstream/7597e09-linux/bin/clang+0x14da3ce3) #11 0x0000558c05328f3f clang::Parser::ParseCompoundStatementBody(bool) (/home/dyung/src/upstream/7597e09-linux/bin/clang+0x14da8f3f) #12 0x0000558c0532acfd clang::Parser::ParseCompoundStatement(bool, unsigned int) (/home/dyung/src/upstream/7597e09-linux/bin/clang+0x14daacfd) ... (Repeats many times) #253 0x0000558c0531af45 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/home/dyung/src/upstream/7597e09-linux/bin/clang+0x14d9af45) #254 0x0000558c05323ce3 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/home/dyung/src/upstream/7597e09-linux/bin/clang+0x14da3ce3) #255 0x0000558c05328f3f clang::Parser::ParseCompoundStatementBody(bool) (/home/dyung/src/upstream/7597e09-linux/bin/clang+0x14da8f3f) AddressSanitizer:DEADLYSIGNAL ================================================================= ==251308==ERROR: AddressSanitizer: stack-overflow on address 0x7fff60f79d48 (pc 0x558c0531a96c bp 0x7fff60f7ac20 sp 0x7fff60f79c90 T0) #0 0x558c0531a96b in clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/home/dyung/src/upstream/7597e09-linux/bin/clang-20+0x14d9a96b) #1 0x558c05323ce2 in clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/home/dyung/src/upstream/7597e09-linux/bin/clang-20+0x14da3ce2) #2 0x558c05328f3e in clang::Parser::ParseCompoundStatementBody(bool) [clone .localalias] (/home/dyung/src/upstream/7597e09-linux/bin/clang-20+0x14da8f3e) #3 0x558c0532acfc in clang::Parser::ParseCompoundStatement(bool, unsigned int) (/home/dyung/src/upstream/7597e09-linux/bin/clang-20+0x14daacfc) #4 0x558c0531af44 in clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/home/dyung/src/upstream/7597e09-linux/bin/clang-20+0x14d9af44) #5 0x558c05323ce2 in clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/home/dyung/src/upstream/7597e09-linux/bin/clang-20+0x14da3ce2) #6 0x558c05328f3e in clang::Parser::ParseCompoundStatementBody(bool) [clone .localalias] (/home/dyung/src/upstream/7597e09-linux/bin/clang-20+0x14da8f3e) #7 0x558c0532acfc in clang::Parser::ParseCompoundStatement(bool, unsigned int) (/home/dyung/src/upstream/7597e09-linux/bin/clang-20+0x14daacfc) ... #244 0x558c0531af44 in clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/home/dyung/src/upstream/7597e09-linux/bin/clang-20+0x14d9af44) #245 0x558c05323ce2 in clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/home/dyung/src/upstream/7597e09-linux/bin/clang-20+0x14da3ce2) #246 0x558c05328f3e in clang::Parser::ParseCompoundStatementBody(bool) [clone .localalias] (/home/dyung/src/upstream/7597e09-linux/bin/clang-20+0x14da8f3e) #247 0x558c0532acfc in clang::Parser::ParseCompoundStatement(bool, unsigned int) (/home/dyung/src/upstream/7597e09-linux/bin/clang-20+0x14daacfc) #248 0x558c0531af44 in clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/home/dyung/src/upstream/7597e09-linux/bin/clang-20+0x14d9af44) SUMMARY: AddressSanitizer: stack-overflow (/home/dyung/src/upstream/7597e09-linux/bin/clang-20+0x14d9a96b) in clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) ==251308==ABORTING ``` https://github.com/llvm/llvm-project/pull/104717 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
