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Changelog

pystack 1.7.1 (2026-08-07)

Features

  • Wheels for Python 3.15 are now published. (#342)

Bug Fixes

  • Our locating of the _PyRuntime symbol has been made more robust. (#336)
  • An incompatibility with Python 3.15 introduced in 3.15.0b4 has been fixed. (#337)

Miscellaneous

  • We now publish abi3 wheels for Python 3.12 and later. (#331)
  • Release builds of PyStack are now built with LTO (Link Time Optimization) enabled. (#330)
  • Editable installs of PyStack are now built with -Og (optimizations suitable for debugging) enabled. (#330)

pystack 1.7.0 (2026-07-09)

Features

  • Replace Cython with nanobind for Python bindings, improving performance by eliminating round-trips between Python and C++. (#272)
  • Add :ref:`support for Python subinterpreters <multiple-interpreters>`. When a process uses multiple interpreters (e.g. via Python 3.14's concurrent.interpreters module), stacks for all interpreters are now reported instead of just the main one. (#279)
  • Python 3.15 is now supported. The wheels are not yet published because the ABI is not yet frozen. (#289)
  • PyStack is now built against elfutils 0.195, up from 0.193. (#315)

Bug Fixes

  • Fix compatibility with the Python 3.14 JIT compiler. (#277)
  • Fix native mode stacks for Python 3.14's LLVM-generated *_TAIL_CALL_* frames. (#277)
  • Fix IndexError in traceback formatting when the source file has fewer lines than expected. (#191)
  • Fix an extra blank line sometimes being printed in the middle of a traceback. (#298)

pystack 1.6.0 (2026-01-25)

Features

  • Provide wheels for free-threaded builds of Python 3.13 (#271)
  • Add the Python 3.14 trove classifier to our package metadata (#269)
  • Improve some error messages and log messages (#260, #258)

Bug Fixes

  • Fix handling of duplicate _PyRuntime symbols when ctypes mmaps a statically linked Python interpreter's binary in order to create a trampoline. Previously this led to "Invalid address in remote process" errors. (#258)

pystack 1.5.1 (2025-08-18)

Bug Fixes

  • Correct a bug in our GitHub Actions workflow that prevented artifacts for 1.5.0 from being uploaded to PyPI. No changes have been made to the PyStack code itself since 1.5.0 (#250)

pystack 1.5.0 (2025-08-18)

Features

  • Add a new --native-last command line flag to only show the C frames after the last Python frame. (#182)
  • Add support for Python 3.14 (#229)
  • Support kernels that don't have CONFIG_CROSS_MEMORY_ATTACH set. (#240)

Deprecations and Removals

  • We no longer provide x86-64 musllinux_1_1 wheels. The manylinux project dropped support for musllinux_1_1 on November 1st, 2024. (#237)
  • We no longer provide Python 3.7 wheels. Python 3.7 has been end-of-life since June 2023. (#237)

Bug Fixes

  • Fix incorrect file offset calculation when analyzing ELF files with non-standard ELF layouts. Previously, pystack would fail to correctly analyze Python binaries that had non-standard ELF layouts (for example when compiled with certain linker options). The fix properly accounts for PT_LOAD segment mappings when calculating file offsets. (#220)
  • Improve handling of core files where we cannot determine the executable. (#221)

pystack 1.4.1 (2024-10-04)

Features

  • Improve our ability to debug Python 3.13 processes when the _Py_DebugOffsets cannot be located by accounting for a structure layout change in CPython 3.13.0rc3 (the reversion of the incremental cyclic garbage collector). (#213)

pystack 1.4.0 (2024-09-11)

Features

  • Add support for Python 3.13 (#186)
  • Add support for gzip compressed corefiles (#171)
  • Add a new --version command line flag to show the version of pystack (#203)
  • Support debugging free-threading (a.k.a. "nogil") Python 3.13 builds. Note that PyStack can't itself be run with python3.13t, it can only attach to a python3.13t process or core file from another interpreter. (#206)

Bug Fixes

  • Fix a bug that was causing Python scripts executed directly via shebang to report the shell script as the executable. (#184)
  • Heap corruption could cause PyStack to fail to generate a stack when --locals mode was used. This has been fixed by falling back to a reasonable default when attempting to format the repr of a local variable causes a dereference of an invalid pointer. (#194)
  • Fix a crash when analysing processes where the eval loop has a shim frame at the bottom of the stack (#204)

pystack 1.3.0 (2023-11-28)

Bug Fixes

  • Add a patch to the bundled elfutils used to create wheels to account for a bug when analysing cores with interleaved segments (#153)
  • Removed the unused --self flag. (#141)
  • Fix some instances when identifying the pthread id was failing in systems without GLIBC (#152)
  • Fix several some race conditions when stopping threads in multithreaded programs (#155)
  • Ensure log messages that contain non-UTF-8 data are not lost (#155)

pystack 1.2.0 (2023-07-31)

Features

  • Add support for Python 3.12 (#108)
  • Improve the performance of reading memory from running processes (#124)
  • Improve the performance of reading memory from core files (#126)

pystack 1.1.0 (2023-07-10)

Bug Fixes

  • Allow building with older elfutils than 0.188 when building with glibc (for musl libc we still need newer versions). (#40)
  • Improve error reporting when attaching to a process is forbidden. (#98)
  • Fix a crash that could occur under some unusual conditions if elfutils could not unwind the stack. (#101)
  • Drop a use of the f-string = specifier, which wasn't introduced until Python 3.8 (running PyStack with Python 3.7 was failing because of this). (#92)

pystack 1.0.1 (2023-04-11)

No significant changes.

pystack 1.0.0 (2023-04-06)

  • Initial release.