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Fri, 10 Apr 2026 10:09:45 -0700 (PDT) Received: from localhost ([2a03:2880:30ff:45::]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488d5d70315sm27024735e9.1.2026.04.10.10.09.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Apr 2026 10:09:44 -0700 (PDT) From: Mykyta Yatsenko Subject: [PATCH bpf-next v9 0/6] bpf: Add support for sleepable tracepoint programs Date: Fri, 10 Apr 2026 10:09:28 -0700 Message-Id: <20260410-sleepable_tracepoints-v9-0-e719e664e84c@meta.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAMku2WkC/33QwWrDMBAE0F8xOkdltSvJik/9j1KKZK0bQWIby 5iU4H8vcQ8VLu554A0zD5F5SpxFUz3ExEvKaehFU51PlWgvvv9kmaJoKoGAFlBZma/Mow9X/pg n3/I4pH7OkpzyrLQCY0CcKjFO3KX75r6JMHay5/ss3k+VuKQ8D9PXVrjglv/YaA7sBSVIIILou 2gNdK83nv1LO9w2cKFfhJQ6QkiCJD6HENmEiLhDdInQEaIlyMihtc55awPtEFMiR1ctRoJ0xqC JXKuIZofYAkF9hNgnooIP5DV1f5C6RMx/CAblMPqWvdrPcQVCcIS4J8KEpG3dkYcCWdf1G+dO8 RthAgAA X-Change-ID: 20260216-sleepable_tracepoints-381ae1410550 To: bpf@vger.kernel.org, ast@kernel.org, andrii@kernel.org, daniel@iogearbox.net, kafai@meta.com, kernel-team@meta.com, eddyz87@gmail.com, memxor@gmail.com, peterz@infradead.org, rostedt@goodmis.org Cc: Mykyta Yatsenko X-Mailer: b4 0.16-dev X-Developer-Signature: v=1; a=ed25519-sha256; t=1775840982; l=6223; i=yatsenko@meta.com; s=20260324; h=from:subject:message-id; bh=xkpeaqgTbohdCin9Jn+1+/U52/ki/5QAqbDxwDr8Imw=; b=NazDQdbkfYYpANUoFahkp6HSQW+FlQVkCu0uaoTPxFUQiN8zQhMjhTiObrw0lQ+3HpAXTAP6w Ij+LybLciGBBOykeXJcmSIs6mcROFXLQpC2uz+qpnGbKPFzGZskNhUy X-Developer-Key: i=yatsenko@meta.com; a=ed25519; pk=1zCUBXUa66KmzfjNsG8YNlMj2ckPdqBPvFq2ww3/YaA= This series adds support for sleepable BPF programs attached to raw tracepoints (tp_btf, raw_tp) and classic tracepoints (tp). The motivation is to allow BPF programs on syscall tracepoints to use sleepable helpers such as bpf_copy_from_user(), enabling reliable user memory reads that can page-fault. This series removes restriction for faultable tracepoints: Patch 1 modifies __bpf_trace_run() to support sleepable programs. Patch 2 introduce bpf_prog_run_array_sleepable() to support new usecase. Patch 3 adds sleepable support for classic tracepoints (BPF_PROG_TYPE_TRACEPOINT) by introducing trace_call_bpf_faultable() and restructuring perf_syscall_enter/exit() to run BPF programs in faultable context. Patch 4 allows BPF_TRACE_RAW_TP, BPF_PROG_TYPE_RAW_TRACEPOINT, and BPF_PROG_TYPE_TRACEPOINT programs to be loaded as sleepable, with load-time and attach-time checks to reject sleepable programs on non-faultable tracepoints. Patch 5 adds libbpf SEC_DEF handlers: tp_btf.s, raw_tp.s, raw_tracepoint.s, tp.s, and tracepoint.s. Patch 6 adds selftests covering tp_btf.s, raw_tp.s, and tp.s positive cases using bpf_copy_from_user() plus negative tests for non-faultable tracepoints. Signed-off-by: Mykyta Yatsenko --- Changes in v9: - Fixed "classic raw tracepoints" to "raw tracepoints (tp_btf, raw_tp)" in commit message - Added bpf_prog_get_recursion_context() guard to __bpf_prog_test_run_raw_tp() to protect per-CPU private stack from concurrent sleepable test runs - Added new bpf_prog_run_array_sleepable() without is_uprobe parameter, remove all changes in bpf_prog_run_array_uprobe() - Refactored attach_tp() to use prefix array uniformly (matching attach_raw_tp() pattern), removing hardcoded strcmp() bare-name checks. - Recursion check in __bpf_prog_test_run_raw_tp() - Refactored selftests - Link to v8: https://patch.msgid.link/20260330-sleepable_tracepoints-v8-0-2e323467f3a0@meta.com Changes in v8: - Fix sleepable tracepoint support in bpf_prog_test_run() (Kumar, sashiko) - Link to v7: https://patch.msgid.link/20260325-sleepable_tracepoints-v6-0-2b182dacea13@meta.com Changes in v7: - Add recursion check (bpf_prog_get_recursion_context()) to make sure private stack is safe when sleepable program is preempted by itself (Alexei, Kumar) - Use combined rcu_read_lock_dont_migrate() instead of separate rcu_read_lock()/migrate_disable() calls for non-sleepable path (Alexei) - Link to v6: https://lore.kernel.org/bpf/20260324-sleepable_tracepoints-v6-0-81bab3a43f25@meta.com/ Changes in v6: - Remove recursion check from trace_call_bpf_faultable(), sleepable tracepoints are called from syscall enter/exit, no recursion is possible.(Kumar) - Refactor bpf_prog_run_array_uprobe() to support tracepoints usecase cleanly (Kumar) - Link to v5: https://lore.kernel.org/r/20260316-sleepable_tracepoints-v5-0-85525de71d25@meta.com Changes in v5: - Addressed AI review: zero initialize struct pt_regs in perf_call_bpf_enter(); changed handling tp.s and tracepoint.s in attach_tp() in libbpf. - Updated commit messages - Link to v4: https://lore.kernel.org/r/20260313-sleepable_tracepoints-v4-0-debc688a66b3@meta.com Changes in v4: - Follow uprobe_prog_run() pattern with explicit rcu_read_lock_trace() instead of relying on outer rcu_tasks_trace lock - Add sleepable support for classic raw tracepoints (raw_tp.s) - Add sleepable support for classic tracepoints (tp.s) with new trace_call_bpf_faultable() and restructured perf_syscall_enter/exit() - Add raw_tp.s, raw_tracepoint.s, tp.s, tracepoint.s SEC_DEF handlers - Replace growing type enumeration in error message with generic "program of this type cannot be sleepable" - Use PT_REGS_PARM1_SYSCALL (non-CO-RE) in BTF test - Add classic raw_tp and classic tracepoint sleepable tests - Link to v3: https://lore.kernel.org/r/20260311-sleepable_tracepoints-v3-0-3e9bbde5bd22@meta.com Changes in v3: - Moved faultable tracepoint check from attach time to load time in bpf_check_attach_target(), providing a clear verifier error message - Folded preempt_disable removal into the sleepable execution path patch - Used RUN_TESTS() with __failure/__msg for negative test case instead of explicit userspace program - Reduced series from 6 patches to 4 - Link to v2: https://lore.kernel.org/r/20260225-sleepable_tracepoints-v2-0-0330dafd650f@meta.com Changes in v2: - Address AI review points - modified the order of the patches - Link to v1: https://lore.kernel.org/bpf/20260218-sleepable_tracepoints-v1-0-ec2705497208@meta.com/ --- Mykyta Yatsenko (6): bpf: Add sleepable support for raw tracepoint programs bpf: Add bpf_prog_run_array_sleepable() bpf: Add sleepable support for classic tracepoint programs bpf: Verifier support for sleepable tracepoint programs libbpf: Add section handlers for sleepable tracepoints selftests/bpf: Add tests for sleepable tracepoint programs include/linux/bpf.h | 50 +++++++ include/linux/trace_events.h | 6 + include/trace/bpf_probe.h | 2 - kernel/bpf/syscall.c | 5 + kernel/bpf/verifier.c | 13 +- kernel/events/core.c | 9 ++ kernel/trace/bpf_trace.c | 48 ++++++- kernel/trace/trace_syscalls.c | 110 ++++++++------- net/bpf/test_run.c | 65 +++++++-- tools/lib/bpf/libbpf.c | 88 +++++++----- .../bpf/prog_tests/sleepable_tracepoints.c | 154 +++++++++++++++++++++ .../bpf/progs/test_sleepable_tracepoints.c | 125 +++++++++++++++++ .../bpf/progs/test_sleepable_tracepoints_fail.c | 18 +++ tools/testing/selftests/bpf/verifier/sleepable.c | 17 ++- 14 files changed, 603 insertions(+), 107 deletions(-) --- base-commit: 869997746f5b022e51e6fe5225dcfa25baf6a8bc change-id: 20260216-sleepable_tracepoints-381ae1410550 Best regards, -- Mykyta Yatsenko