[Bug 2142335] [NEW] Segfault in llvm-objdump --offloading with object file

Fri Feb 20 23:07:31 UTC 2026

Public bug reported:

# What was expected

llvm-objdump-21 --offloading should successfully extract the offload
bundles from an object file created by clang-21 using --offload-
compress. This is what occurs with LLVM 22.

```
# llvm-objdump-22 --offloading ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o

./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o:	file format elf64-x86-64
Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.host-x86_64-unknown-linux-gnu-
Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx1010
Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx1030
Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx1100
Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx1101
Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx1102
Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx803
Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx900
Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx906
Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx908
Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx90a
```

# What happened instead

```
# LLVM_SYMBOLIZER_PATH=/usr/lib/llvm-21/bin/llvm-symbolizer llvm-objdump-21 --offloading ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o

./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o:	file format elf64-x86-64
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: llvm-objdump-21 --offloading ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o
 #0 0x00007f6355ed9eaf llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib/x86_64-linux-gnu/libLLVM.so.21.1+0x44d9eaf)
 #1 0x00007f6355ed7757 llvm::sys::RunSignalHandlers() (/usr/lib/x86_64-linux-gnu/libLLVM.so.21.1+0x44d7757)
 #2 0x00007f6355edac9a (/usr/lib/x86_64-linux-gnu/libLLVM.so.21.1+0x44dac9a)
 #3 0x00007f6351245f30 (/usr/lib/x86_64-linux-gnu/libc.so.6+0x45f30)
 #4 0x00007f6351397222 (/usr/lib/x86_64-linux-gnu/libc.so.6+0x197222)
 #5 0x0000560424a75239 (/usr/lib/llvm-21/bin/llvm-objdump+0xc0239)
 #6 0x0000560424a7478e (/usr/lib/llvm-21/bin/llvm-objdump+0xbf78e)
 #7 0x00005604249f4156 (/usr/lib/llvm-21/bin/llvm-objdump+0x3f156)
 #8 0x00005604249e9c50 (/usr/lib/llvm-21/bin/llvm-objdump+0x34c50)
 #9 0x0000560424a7c823 (/usr/lib/llvm-21/bin/llvm-objdump+0xc7823)
#10 0x00007f635122a575 (/usr/lib/x86_64-linux-gnu/libc.so.6+0x2a575)
#11 0x00007f635122a628 __libc_start_main (/usr/lib/x86_64-linux-gnu/libc.so.6+0x2a628)
#12 0x00005604249e11b5 (/usr/lib/llvm-21/bin/llvm-objdump+0x2c1b5)
Segmentation fault         LLVM_SYMBOLIZER_PATH=/usr/lib/llvm-21/bin/llvm-symbolizer llvm-objdump-21 --offloading ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o
```

The error that occurs when run on a shared object library is slightly different, though probably related:
```
# llvm-objdump-21 --offloading ./obj-x86_64-linux-gnu/library/librocsparse.so.1.0 

./obj-x86_64-linux-gnu/library/librocsparse.so.1.0:	file format elf64-x86-64
llvm-objdump-21: error: './obj-x86_64-linux-gnu/library/librocsparse.so.1.0': while extracting offload FatBin bundles: Failed to decompress input: Could not decompress embedded file contents: Src size is incorrect
```

(The extraction of offload sections from the shared object library also
functions properly with llvm-objdump-22.)

# System Info

## lsb_release -rd
Description:	Ubuntu Resolute Raccoon (development branch)
Release:	26.04

## apt-cache policy llvm-21
llvm-21:
  Installed: 1:21.1.8-1ubuntu1
  Candidate: 1:21.1.8-1ubuntu1
  Version table:
     1:21.1.8-3ubuntu1 100
        100 http://archive.ubuntu.com/ubuntu resolute-proposed/universe amd64 Packages
 *** 1:21.1.8-1ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu resolute/universe amd64 Packages
        100 /var/lib/dpkg/status

** Affects: llvm
     Importance: Unknown
         Status: Unknown

** Affects: llvm-toolchain-21 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: llvm-toolchain-21 (Debian)
     Importance: Unknown
         Status: Unknown

** Attachment added: "The problem object file"
   https://bugs.launchpad.net/bugs/2142335/+attachment/5947515/+files/rocsparse_axpyi.cpp.o

** Bug watch added: github.com/llvm/llvm-project/issues #182567
   https://github.com/llvm/llvm-project/issues/182567

** Also affects: llvm via
   https://github.com/llvm/llvm-project/issues/182567
   Importance: Unknown
       Status: Unknown

** Bug watch added: Debian Bug tracker #1128523
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1128523

** Also affects: llvm-toolchain-21 (Debian) via
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1128523
   Importance: Unknown
       Status: Unknown

-- 
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https://bugs.launchpad.net/bugs/2142335

Title:
  Segfault in llvm-objdump --offloading with object file

Status in LLVM:
  Unknown
Status in llvm-toolchain-21 package in Ubuntu:
  New
Status in llvm-toolchain-21 package in Debian:
  Unknown

Bug description:
  # What was expected

  llvm-objdump-21 --offloading should successfully extract the offload
  bundles from an object file created by clang-21 using --offload-
  compress. This is what occurs with LLVM 22.

  ```
  # llvm-objdump-22 --offloading ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o

  ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o:	file format elf64-x86-64
  Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.host-x86_64-unknown-linux-gnu-
  Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx1010
  Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx1030
  Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx1100
  Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx1101
  Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx1102
  Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx803
  Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx900
  Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx906
  Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx908
  Extracting offload bundle: ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o.0.hipv4-amdgcn-amd-amdhsa--gfx90a
  ```

  # What happened instead

  ```
  # LLVM_SYMBOLIZER_PATH=/usr/lib/llvm-21/bin/llvm-symbolizer llvm-objdump-21 --offloading ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o

  ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o:	file format elf64-x86-64
  PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
  Stack dump:
  0.	Program arguments: llvm-objdump-21 --offloading ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o
   #0 0x00007f6355ed9eaf llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib/x86_64-linux-gnu/libLLVM.so.21.1+0x44d9eaf)
   #1 0x00007f6355ed7757 llvm::sys::RunSignalHandlers() (/usr/lib/x86_64-linux-gnu/libLLVM.so.21.1+0x44d7757)
   #2 0x00007f6355edac9a (/usr/lib/x86_64-linux-gnu/libLLVM.so.21.1+0x44dac9a)
   #3 0x00007f6351245f30 (/usr/lib/x86_64-linux-gnu/libc.so.6+0x45f30)
   #4 0x00007f6351397222 (/usr/lib/x86_64-linux-gnu/libc.so.6+0x197222)
   #5 0x0000560424a75239 (/usr/lib/llvm-21/bin/llvm-objdump+0xc0239)
   #6 0x0000560424a7478e (/usr/lib/llvm-21/bin/llvm-objdump+0xbf78e)
   #7 0x00005604249f4156 (/usr/lib/llvm-21/bin/llvm-objdump+0x3f156)
   #8 0x00005604249e9c50 (/usr/lib/llvm-21/bin/llvm-objdump+0x34c50)
   #9 0x0000560424a7c823 (/usr/lib/llvm-21/bin/llvm-objdump+0xc7823)
  #10 0x00007f635122a575 (/usr/lib/x86_64-linux-gnu/libc.so.6+0x2a575)
  #11 0x00007f635122a628 __libc_start_main (/usr/lib/x86_64-linux-gnu/libc.so.6+0x2a628)
  #12 0x00005604249e11b5 (/usr/lib/llvm-21/bin/llvm-objdump+0x2c1b5)
  Segmentation fault         LLVM_SYMBOLIZER_PATH=/usr/lib/llvm-21/bin/llvm-symbolizer llvm-objdump-21 --offloading ./obj-x86_64-linux-gnu/library/CMakeFiles/rocsparse.dir/src/level1/rocsparse_axpyi.cpp.o
  ```

  The error that occurs when run on a shared object library is slightly different, though probably related:
  ```
  # llvm-objdump-21 --offloading ./obj-x86_64-linux-gnu/library/librocsparse.so.1.0 

  ./obj-x86_64-linux-gnu/library/librocsparse.so.1.0:	file format elf64-x86-64
  llvm-objdump-21: error: './obj-x86_64-linux-gnu/library/librocsparse.so.1.0': while extracting offload FatBin bundles: Failed to decompress input: Could not decompress embedded file contents: Src size is incorrect
  ```

  (The extraction of offload sections from the shared object library
  also functions properly with llvm-objdump-22.)

  # System Info

  ## lsb_release -rd
  Description:	Ubuntu Resolute Raccoon (development branch)
  Release:	26.04

  ## apt-cache policy llvm-21
  llvm-21:
    Installed: 1:21.1.8-1ubuntu1
    Candidate: 1:21.1.8-1ubuntu1
    Version table:
       1:21.1.8-3ubuntu1 100
          100 http://archive.ubuntu.com/ubuntu resolute-proposed/universe amd64 Packages
   *** 1:21.1.8-1ubuntu1 500
          500 http://archive.ubuntu.com/ubuntu resolute/universe amd64 Packages
          100 /var/lib/dpkg/status

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