[PATCH v2 0/7] coredump & signals: an impossible affair

[Christian Brauner <brauner@kernel.org>]

Hey,

I asked Chris (Mason) to look at some of the coredump code with kres and
he found a couple of things. Some of them I had already found and fixed
but there's some good stuff in here.

Other parts should be more straightforward (hopefully...).

Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
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Changes in v2:
- Add fixes for retarget_shared_signal().
- Expand fixes for signal_pending().
- Link to v1: https://patch.msgid.link/20260915-work-coredump-fixes-v1-0-f354ca41780c@kernel.org

---
Christian Brauner (7):
      fork: refuse new threads while a coredump or an exec is in progress
      coredump: hold RCU while releasing parked threads
      signal: only SIGKILL and the freezers interrupt a coredumping task
      coredump: parse a snapshot of core_pattern
      io-wq: order the exit bit against worker creation task work
      signal: don't retarget shared signals in a dying thread group
      selftests/coredump: test shared signal retargeting during a dump

 fs/coredump.c                                      |  72 ++++---
 include/linux/sched/signal.h                       |  19 +-
 io_uring/io-wq.c                                   |   2 +
 kernel/fork.c                                      |   6 +-
 kernel/signal.c                                    |  12 ++
 tools/testing/selftests/coredump/.gitignore        |   1 +
 tools/testing/selftests/coredump/Makefile          |   4 +-
 .../selftests/coredump/coredump_signal_test.c      | 238 +++++++++++++++++++++
 8 files changed, 318 insertions(+), 36 deletions(-)
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base-commit: b813a7ec026ca59a444ba0a36c2e17ac823eeed0
change-id: 20260915-work-coredump-fixes-edf98c80fe78