[GIT PULL 07/16 for v7.2] kernel misc

[Christian Brauner]

Hey Linus,

/* Summary */

Fixes

- rhashtable: give each instance its own lockdep class

  syzbot reported a circular locking dependency between ht->mutex and
  fs_reclaim via the simple_xattrs rhashtable being torn down during
  inode eviction. The predicted deadlock cannot occur:
  rhashtable_free_and_destroy() cancels the deferred worker before
  taking ht->mutex and acquisitions on distinct rhashtables are on
  distinct mutexes. Lockdep flags a cycle anyway because every
  ht->mutex in the kernel shared the single static lockdep class from
  rhashtable_init_noprof(). The lockdep key is lifted to a
  per-call-site static key so every rhashtable instance gets its own
  class.

- selftests/clone3: fix misuse of the libcap library interface in the
  cap_checkpoint_restore test and remove unused variables

- selftests/pid_namespace: compute the pid_max test limits dynamically
  instead of hardcoding values below the kernel-enforced minimum of
  PIDS_PER_CPU_MIN * num_possible_cpus() which made the tests fail on
  machines with many possible CPUs

- selftests: fix the Makefile TARGETS entry for nsfs which wasn't
  adjusted when the tests moved under filesystems/

Cleanups

- ipc/sem.c: use unsigned int for nsops to match the declaration in
  syscalls.h

/* Testing */

gcc (Debian 14.2.0-19) 14.2.0
Debian clang version 19.1.7 (3+b1)

No build failures or warnings were observed.

/* Conflicts */

Merge conflicts with mainline
=============================

No known conflicts.

Merge conflicts with other trees
================================

The following changes since commit 254f49634ee16a731174d2ae34bc50bd5f45e731:

  Linux 7.1-rc1 (2026-04-26 14:19:00 -0700)

are available in the Git repository at:

  git@xxxxxxxxxxxxxxxxxxx:pub/scm/linux/kernel/git/vfs/vfs tags/kernel-7.2-rc1.misc

for you to fetch changes up to ee8ab98f831226d69d43ccd93f53c50e6f19b389:

  Merge patch series "selftests/clone3: fix cap_checkpoint_restore test" (2026-05-27 14:11:47 +0200)

----------------------------------------------------------------
kernel-7.2-rc1.misc

Please consider pulling these changes from the signed kernel-7.2-rc1.misc tag.

Thanks!
Christian

----------------------------------------------------------------
Bjoern Doebel (1):
      selftests/pid_namespace: compute pid_max test limits dynamically

Christian Brauner (2):
      rhashtable: give each instance its own lockdep class
      Merge patch series "selftests/clone3: fix cap_checkpoint_restore test"

Eva Kurchatova (1):
      selftests/clone3: fix libcap interface usage

Florian Schmaus (1):
      selftests: Fix Makefile target for nsfs

Konstantin Khorenko (1):
      selftests/clone3: remove unused variables

Yi Xie (1):
      ipc/sem.c: use unsigned int for nsops

 include/linux/rhashtable-types.h                   |  22 ++-
 ipc/sem.c                                          |   6 +-
 lib/rhashtable.c                                   |  17 ++-
 tools/testing/selftests/Makefile                   |   2 +-
 .../clone3/clone3_cap_checkpoint_restore.c         |  24 +---
 tools/testing/selftests/pid_namespace/pid_max.c    | 156 ++++++++++++++++-----
 6 files changed, 161 insertions(+), 66 deletions(-)