https://bugs.llvm.org/show_bug.cgi?id=34546
Bug ID: 34546
Summary: LLD crashed with special sections in linker script
Product: lld
Version: unspecified
Hardware: Other
OS: other
Status: NEW
Severity: normal
Priority: P
Component: ELF
Assignee: unassignedb...@nondot.org
Reporter: eblot...@gmail.com
CC: llvm-bugs@lists.llvm.org
Created attachment 19131
--> https://bugs.llvm.org/attachment.cgi?id=19131&action=edit
XZ-tarball to reproduce the issue
I bumped into two potential new issues with LLD 5.0 with variations in linker
scripts.
See attached sample tar archive to reproduce both the issues.
They seems to be similar, hence the single ticker. Let me know if I'm wrong,
or if you want be to create one ticker for each issue.
Host: macOS 10.12.6
Target: Cortex M4 (w/ FPU)
LLD: v5.0.0 final, with patches from 33714 and 34407 applied.
See target.ld in the attached tarball to uncomment the sections that cause
LLD to crash
Use build.sh to build the sample C file and trigger the LLD issue.
By default, both section declarations are disabled, so LDD should run fine.
First issue: .foo2 section with no input content
$ ./build.sh
0 ld.lld 0x000000010bd1c428
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 40
1 ld.lld 0x000000010bd1ca36 SignalHandler(int) + 342
2 libsystem_platform.dylib 0x00007fffb24b2b3a _sigtramp + 26
3 libsystem_platform.dylib 0x0000000000000001 _sigtramp + 1303696609
4 ld.lld 0x000000010be71468 (anonymous
namespace)::Writer<llvm::object::ELFType<(llvm::support::endianness)1, false>
>::finalizeSections() + 11944
5 ld.lld 0x000000010be60c39 (anonymous
namespace)::Writer<llvm::object::ELFType<(llvm::support::endianness)1, false>
>::run() + 7561
6 ld.lld 0x000000010be5ee21 void
lld::elf::writeResult<llvm::object::ELFType<(llvm::support::endianness)1,
false> >() + 161
7 ld.lld 0x000000010bd7d090 void
lld::elf::LinkerDriver::link<llvm::object::ELFType<(llvm::support::endianness)1,
false> >(llvm::opt::InputArgList&) + 3344
8 ld.lld 0x000000010bd77c9e
lld::elf::LinkerDriver::main(llvm::ArrayRef<char const*>, bool) + 3374
9 ld.lld 0x000000010bd7683a
lld::elf::link(llvm::ArrayRef<char const*>, bool, llvm::raw_ostream&) + 490
10 ld.lld 0x000000010bca3431 main + 673
11 libdyld.dylib 0x00007fffb22a3235 start + 1
12 libdyld.dylib 0x000000000000000d start + 1305857497
Stack dump:
0. Program arguments: /usr/local/clang50/bin/ld.lld --Map output.map
--gc-sections --no-whole-archive main.o startup.o -Bstatic
-L/usr/local/clang50/lib/clang/5.0.0/lib/baremetal -T target.ld -o
lld-output.elf
clang-5.0: error: unable to execute command: Segmentation fault: 11
clang-5.0: error: ld.lld command failed due to signal (use -v to see
invocation)
Something unexpected is that moving the same declaration right above the
previous section does not trigger the issue (see .foo1)
Second issue: empty DISCARD section
$ ./build.sh
0 ld.lld 0x000000010299d428
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 40
1 ld.lld 0x000000010299da36 SignalHandler(int) + 342
2 libsystem_platform.dylib 0x00007fffb24b2b3a _sigtramp + 26
3 libsystem_platform.dylib 0x0000000111d29da8 _sigtramp + 1602712200
4 ld.lld 0x0000000102a4f879
lld::elf::LinkerScript::adjustSectionsAfterSorting() + 73
5 ld.lld 0x0000000102af0e58 (anonymous
namespace)::Writer<llvm::object::ELFType<(llvm::support::endianness)1, false>
>::finalizeSections() + 6296
6 ld.lld 0x0000000102ae1c39 (anonymous
namespace)::Writer<llvm::object::ELFType<(llvm::support::endianness)1, false>
>::run() + 7561
7 ld.lld 0x0000000102adfe21 void
lld::elf::writeResult<llvm::object::ELFType<(llvm::support::endianness)1,
false> >() + 161
8 ld.lld 0x00000001029fe090 void
lld::elf::LinkerDriver::link<llvm::object::ELFType<(llvm::support::endianness)1,
false> >(llvm::opt::InputArgList&) + 3344
9 ld.lld 0x00000001029f8c9e
lld::elf::LinkerDriver::main(llvm::ArrayRef<char const*>, bool) + 3374
10 ld.lld 0x00000001029f783a
lld::elf::link(llvm::ArrayRef<char const*>, bool, llvm::raw_ostream&) + 490
11 ld.lld 0x0000000102924431 main + 673
12 libdyld.dylib 0x00007fffb22a3235 start + 1
13 libdyld.dylib 0x000000000000000d start + 1305857497
Stack dump:
0. Program arguments: /usr/local/clang50/bin/ld.lld --Map output.map
--gc-sections --no-whole-archive main.o startup.o -Bstatic
-L/usr/local/clang50/lib/clang/5.0.0/lib/baremetal -T target.ld -o
lld-output.elf
clang-5.0: error: unable to execute command: Segmentation fault: 11
clang-5.0: error: ld.lld command failed due to signal (use -v to see
invocation)
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