From 2b97956af60810cd382b86b9ce9aea421b889861 Mon Sep 17 00:00:00 2001 From: Nuoqi Gui Date: Fri, 4 Sep 2026 12:41:55 +0200 Subject: selftests/bpf: Test rhtab kptr cancellation semantics Resizable hash-map updates and deletions must not perform full special-field destruction in their caller context. In particular, a referenced kptr must remain attached to the allocation until the memory allocator destructor can release it safely. Add separate coverage for both affected paths. The update test stores a task kptr, replaces the ordinary value bytes with BPF_EXIST, and verifies that the kptr survived. The delete test removes an element and exchanges its kptr through the still-valid map-value pointer before the allocation is reclaimed. Both cases observe a NULL kptr when rhtab uses bpf_obj_free_fields(). They recover and release the reference after rhtab switches to cancellation semantics. Signed-off-by: Nuoqi Gui [ kkd: Split update and delete coverage and rewrote the commit log ] Signed-off-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20260904104203.345917-5-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- tools/memory-model/linux-kernel.cfg | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 tools/memory-model/linux-kernel.cfg (limited to 'tools/memory-model/linux-kernel.cfg') diff --git a/tools/memory-model/linux-kernel.cfg b/tools/memory-model/linux-kernel.cfg new file mode 100644 index 000000000..69b04f3aa --- /dev/null +++ b/tools/memory-model/linux-kernel.cfg @@ -0,0 +1,22 @@ +macros linux-kernel.def +bell linux-kernel.bell +model linux-kernel.cat +variant lkmmv2 +graph columns +squished true +showevents noregs +movelabel true +fontsize 8 +xscale 2.0 +yscale 1.5 +arrowsize 0.8 +showinitrf false +showfinalrf false +showinitwrites false +splines spline +pad 0.1 +edgeattr hb,color,indigo +edgeattr co,color,blue +edgeattr mb,color,darkgreen +edgeattr wmb,color,darkgreen +edgeattr rmb,color,darkgreen -- cgit v1.3.1