kernel/git/next/linux-next.git/lib/tests, branch master

Merge tag 'slab-for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab

2026-08-24T17:58:57+00:00

Pull slab updates from Vlastimil Babka: - Add kfree_rcu_nolock() that can be used from contexts where spinning on a lock might be unsafe, such as a BPF program attached to an arbitrary function, or in NMI context. This complements the existing kfree_nolock() support (Harry Yoo) - Runtime instead of compile-time slabobj_ext sizing. Avoid wasting memory when memory allocation profiling is compiled but not enabled, with initial partial support to also avoid wasting memory for objcg pointers when those are not needed, while profiling is enabled (Vlastimil Babka) - Various non-urgent fixes, cleanups and optimizations (Hao Li, Hongling Zeng, Li RongQing, Li Xiasong, Seongjun Hong, Shengming Hu) * tag 'slab-for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab: (31 commits) mm/slab, kfence, memcg: completely remove obj_ext for kfence objects mm/slab: stop allocating objcg pointers when unnecessary mm/slab: add cache_ and slab_needs_objcg() helpers mm/slab: stop exporting kvfree_rcu_barrier[_on_cache]() slub_kunit: extend the test for kfree_rcu_nolock() mm/slab: introduce kfree_rcu_nolock() mm/slab: introduce struct kvfree_rcu_head for kvfree_rcu batching mm/slab: reduce slabobj_ext memory with allocation profiling disabled mm/slab: introduce slab_obj_ext_has_codetag() mm/slab: allow kfree_rcu_sheaf() on PREEMPT_RT mm/slab: extend deferred free mechanism to handle rcu sheaves mm/slab: use call_rcu() in unknown context if irqs are enabled mm/slab: handle the !allow_spin case in kfree_rcu_sheaf() mm/slab: change struct slabobj_ext to a union mm/slab: replace slab.stride with obj_exts_in_object mm/slab: abstract slabobj_ext.ref access mm/slab: abstract slabobj_ext.objcg access mm/slab: make slab_obj_ext() determine object index mm: move struct slabobj_ext to mm/slab.h mm/slab: remove objs_per_slab() ...

Merge tag 'mm-nonmm-stable-2026-08-22-16-57' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-08-23T15:07:11+00:00

Pull non-MM updates from Andrew Morton: - "ocfs2/dlm: bound peer-controlled lengths in the o2dlm" (Bryam Vargas) Validate and bound all input lengths and count fields in the o2dlm migration and recovery receive handlers to prevent memory corruption and kernel panics from malformed cluster messages - "ocfs2: validate xattr entry bounds" (Cen Zhang) Validate OCFS2 extended attribute entry name and value bounds during metadata reads to prevent out-of-range memory accesses during retrieval or listing operations. - "taskstats: fix cgroupstats invalid fd handling and add selftests" (Yiyang Chen) Return -EBADF when cgroupstats receives an invalid file descriptor to prevent caller hangs and misleading success ACKs. Add a kselftest to validate valid cgroup v1 queries and verify proper error handling across different Netlink flag combinations. - "misc lib/raid/ improvements v2" (Christoph Hellwig) Improve benchmark-based algorithm selection for the XOR and RAID6 libraries, add KUnit benchmark tests, and cleanup minor implementation details. - "ocfs2: cluster: o2hb_region_pin() fixes" (Joseph Qi) Fix sleeping-in-atomic, lock order inversion and error-path cleanup bugs in o2hb_region_pin() by releasing o2hb_live_lock across sleeping configfs_depend_item() calls and using unlocked variants from callback context. Ensure failed pin attempts properly decrement user counts and unpin partially initialized heartbeat regions to prevent memory leaks and unprotected states. - "lib/ucs2_string.c: fix out-of-bounds read in ucs2_strnlen()" (Vincent Mailhol) Fix an off-by-one which could cause an out-of-bounds read. - "ocfs2: harden heartbeat teardown races" (Cen Zhang) Fix two OCFS2 heartbeat/o2net teardown races found by KASAN. - "taskstats: tidy up the cpumask command path" *Bradley Morgan) make two small cleanups in kernel/taskstats.c. - "ocfs2: validate active orphan slots during inode read" (ZhengYuan Huang) Validate active ordinary and append-DIO orphan slots read from OCFS2 dinodes at the metadata boundary to prevent corrupted slot indices from causing out-of-bounds array accesses. - "ocfs2: bound-check both readdir re-validation scans" (Zhan Xusheng) Enforce strict boundary checks on directory entry record lengths and offset calculations during OCFS2 directory re-scans to prevent out-of-bounds memory reads and directory position corruption. * tag 'mm-nonmm-stable-2026-08-22-16-57' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (95 commits) mailmap: fix bouncing address for Taniya Das ocfs2: bound-check dir entries in the inline-data re-validation scan ocfs2: bound-check dir entries in the readdir re-validation scan squashfs: avoid thundering-herd cache wakeups prctl: fix PR_SET_MM_AUXV losing the forced AT_NULL terminator mailmap: update email address for Linfeng Sun lib/interval_tree: fix allocation warning messages checkpatch: add NOKPROBE_SYMBOL to the whitelist of lines that can occur immediately after functions Squashfs: check block offset is not negative signal: factor out the kernel reserved si_code check ocfs2: fix readdir position truncation on 32-bit kernels ocfs2: fix cached cluster count after suballocator reclaim ocfs2: fix circular locking dependency in ocfs2_init_acl() ocfs2: validate DIO orphan slot during inode read ocfs2: validate orphan slot during inode read selftests/prctl: fix non-anonymous VMA mapping in set-anon-vma-name test MAINTAINERS: add IRC and patchwork for LTP include/linux/list.h: mark list_add and __list_add as __always_inline tools/mm: prevent page_owner_sort from truncating input hung_task: update DETECT_HUNG_TASK_BLOCKER Kconfig help ...

Merge tag 'printk-for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux

2026-08-20T22:34:31+00:00

Pull printk updates from Petr Mladek: - Prevent a possible out-of-bound access and a use-after-free in rather theoretical situations - Make no_hash_pointers take effect early - Some fixes and clean up of the ratelimit KUnit test * tag 'printk-for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux: printk: Handle pre-enabled consoles in the top-level register_console() printk: Fix possible console use-after-free lib/tests: test_ratelimit: fix stress test thread lifecycle and leak lib/vsprintf: Make no_hash_pointers take effect early

slub_kunit: extend the test for kfree_rcu_nolock()

2026-08-04T10:18:29+00:00

When slub_kunit is not built-in, call kfree_rcu() and kfree_rcu_nolock() to test kfree_rcu_nolock() in slub_kunit. Rename the test case as the test covers more _nolock() APIs. Acked-by: Vlastimil Babka (SUSE) Signed-off-by: Harry Yoo (Oracle) Link: https://patch.msgid.link/20260729-kfree_rcu_nolock-v5-8-a28cdcda9673@kernel.org Signed-off-by: Vlastimil Babka (SUSE)

Revert "printf: Compile the kunit test with DISABLE_BRANCH_PROFILING DISABLE_BRANCH_PROFILING"

2026-08-04T04:10:11+00:00

This reverts commit 8901ac9d2c7eb8ed7ae5e749bf13ecb3b6062488. The commit 94bfc7f3b0c7 ("err.h: use __always_inline on all error pointer helpers") fixes the problem with a dead code elimination by always inlining IS_ERR() function. It prevents the related linker failures as well. The workaround with disabling branch profiling is not longer necessary. Link: https://lore.kernel.org/20260707135522.120447-1-pmladek@suse.com Signed-off-by: Petr Mladek Suggested-by: Andy Shevchenko Closes: https://lore.kernel.org/r/ah6WDkwO8eYY5f2a@ashevche-desk.local Reviewed-by: Andy Shevchenko Cc: Aleksander Lobakin Cc: Arnd Bergmann Cc: David Laight Cc: Nathan Chancellor Cc: Rasmus Villemoes Cc: Sergey Senozhatsky Cc: Steven Rostedt Signed-off-by: Andrew Morton

lib/random32: convert selftest to KUnit

2026-08-04T04:10:09+00:00

Convert the existing prandom selftest (lib/random32.c) to use the KUnit framework (lib/tests/random32_kunit.c). Unlike typical KUnit tests, this file is directly #included into lib/random32.c. The new test: - Removes the legacy CONFIG_RANDOM32_SELFTEST from lib/random32.c. - Adds CONFIG_PRANDOM_KUNIT_TEST (defaulting to KUNIT_ALL_TESTS). - Moves the test logic to lib/tests/random32_kunit.c. This commit is verified by `./tools/testing/kunit/kunit.py run` with the .kunit/.kunitconfig: CONFIG_KUNIT=y CONFIG_PRANDOM_KUNIT_TEST=y Link: https://lore.kernel.org/20260703050100.23944-1-note351@hotmail.com Signed-off-by: Kir Chou Reviewed-by: David Gow Cc: Brendan Higgins Cc: David S. Miller Cc: Eric Dumazet Cc: Geert Uytterhoeven Cc: Jakub Kacinski Cc: Kuan-Wei Chiu Cc: Paolo Abeni Cc: Simon Horman Cc: Thomas Weißschuh Signed-off-by: Andrew Morton

mm/slab, slub_kunit: register kprobe to trigger _nolock APIs

2026-07-29T12:20:03+00:00

Since kmalloc_nolock() always fails in NMI and hardirq contexts on PREEMPT_RT, slub_kunit cannot properly test _nolock() APIs. Register a kprobe pre-handler to invoke kmalloc_nolock() and kfree_nolock() in the middle of the slab allocator. However, do not register the handler on UP kernels because that use case is not well supported [1] in the kernel. To attach the pre-handler while s->cpu_sheaves->lock or n->list_lock is held, add a wrapper function for lockdep_assert_held() that calls a no-op function slab_attach_kprobe_locked() on debug builds. The function is optimized away when neither CONFIG_PROVE_LOCKING nor CONFIG_DEBUG_VM is selected and register_kprobe() fails. The function calls barrier() to prevent the compiler from optimizing away its callsites. Otherwise, the compiler may consider the function does not have any side effect and remove callsites. Compared to using plain kprobe, this has two advantages: 1) it avoids hardcoding function names in the test, and 2) it can trigger those APIs in the middle of a function, where the lock is expected to be held as annotated with lockdep. While it was proposed [2] to use kunit function redirection to test this, it is currently infeasible as some lock helpers don't have symbols. Factor out the nested loop that calls kmalloc and friends to test_kmalloc_kfree(), and call them in test_kmalloc_kfree_nolock_{perf,kprobe}(), each being an independent test case. During the refactoring, drop alloc_fail handling as it doesn't provide much benefits. Link: https://lore.kernel.org/linux-mm/20260427-nolock-api-fix-v2-0-a6b83a92d9a4@kernel.org [1] Link: https://lore.kernel.org/linux-mm/6edebc2b-5f5a-4b9c-9a4c-564310acee1b@kernel.org [2] Acked-by: Vlastimil Babka (SUSE) Reviewed-by: Shengming Hu Signed-off-by: Harry Yoo (Oracle) Link: https://patch.msgid.link/20260729-kfree_rcu_nolock-v5-1-a28cdcda9673@kernel.org Signed-off-by: Vlastimil Babka (SUSE)

net: Use helpers to get/set UDP len tree-wide

2026-07-22T11:47:02+00:00

Since BIG TCP for UDP tunnels will start using len=0 in the UDP header as an indicator of a GSO packet bigger than 65535 bytes, this commit introduces the following getter and setters to use tree-wide, in order to explicitly mark places where len=0 may be expected, and handle them properly: 1. udp_set_len() sets uh->len to its real value if it's not bigger than 65535, and to 0 otherwise: to be used in GSO context with aggregated packets. 2. udp_set_len_short() is to be used when the length is known to fit 16 bits. It WARNs when the caller tries to assign a bigger value if CONFIG_DEBUG_NET=y. 3. udp_get_len_short() returns len in host byte order: to be used on the RX side to deal with non-aggregated packets, or to access the raw value of the len field. 4. udp_get_len() decodes uh->len set by udp_set_len(). It checks whether the packet is GSO to guard from malformed packets. At the moment udp_set_len() is not used, a following commit will start using it after enabling len>65535 for GSO. Raw uh->len (in network byte order) is still accessed in a few places for checksum calculation purposes, and to decode len=0 in udpv6_rcv for jumbograms. udp_rcv and udpv6_rcv will be addressed by the commit that starts using udp_set_len() to set UDP len=0 for BIG TCP packets in UDP tunnels. Signed-off-by: Alice Mikityanska Reviewed-by: Willem de Bruijn Acked-by: Jason A. Donenfeld Link: https://patch.msgid.link/20260710134242.216538-2-alice.kernel@fastmail.im Reviewed-by: Nikolay Aleksandrov Signed-off-by: Paolo Abeni

iov_iter: Remove unused variable in kunit_iov_iter.c

2026-07-01T13:26:29+00:00

Remove the no longer used variable 'b' from iov_kunit_copy_to_bvec(). The variable is initialised and incremented, but nothing now makes use of the value. Signed-off-by: David Howells Link: https://patch.msgid.link/20260625140640.3116900-9-dhowells@redhat.com Reviewed-by: Christoph Hellwig cc: Ming Lei cc: Paulo Alcantara cc: Matthew Wilcox cc: Christoph Hellwig cc: Jens Axboe cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner (Amutable)

lib/tests: test_ratelimit: fix stress test thread lifecycle and leak

2026-06-25T11:28:37+00:00

The stress test's WARN_ON_ONCE(!sktp->tp) check in the child thread is racy and unnecessary: since kthread_run() wakes the thread before returning, the child can run before sktp[i].tp has been assigned. Moreover, sktp->tp is never actually used in the child function, so the check serves no purpose. Remove it and keep the original kthread_run() Also add a common cleanup path for thread creation failures. If creating one of the later threads fails, stop all threads that were already started and free the allocated array instead of leaving orphan kthreads and leaked memory behind. Finally, replace the module-static doneflag with kthread_should_stop(). With the doneflag, child threads may exit before the parent calls kthread_stop(), so the task lifetime is no longer guaranteed when the parent later tries to stop them. Using kthread_should_stop() keeps each child alive until kthread_stop() synchronously terminates it. Suggested-by: Petr Mladek Signed-off-by: Jia He Reviewed-by: Petr Mladek Tested-by: Petr Mladek Acked-by: Paul E. McKenney Link: https://patch.msgid.link/20260529085855.1810870-1-justin.he@arm.com Signed-off-by: Petr Mladek