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Wed, 12 Aug 2026 00:12:39 -0700 (PDT) From: Qing Wang To: syzbot+72a43cdb78469f7fbad1@syzkaller.appspotmail.com Cc: acme@kernel.org, adrian.hunter@intel.com, alexander.shishkin@linux.intel.com, irogers@google.com, jolsa@kernel.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, mark.rutland@arm.com, mingo@redhat.com, namhyung@kernel.org, peterz@infradead.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [perf?] WARNING: suspicious RCU usage in get_callchain_entry Date: Wed, 12 Aug 2026 15:12:31 +0800 Message-Id: <20260812071231.201931-1-wangqing7171@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <000000000000fe324606174e1f9e@google.com> References: <000000000000fe324606174e1f9e@google.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit #syz test diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 75495a5c3507..ee3d8ed11699 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -84,6 +84,7 @@ static struct bpf_raw_event_map *bpf_get_raw_tracepoint_module(const char *name) u64 bpf_get_stackid(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); u64 bpf_get_stack(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); +u64 bpf_get_stack_sleepable(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); static int bpf_btf_printf_prepare(struct btf_ptr *ptr, u32 btf_ptr_size, u64 flags, const struct btf **btf, @@ -1705,6 +1706,32 @@ static const struct bpf_func_proto bpf_get_stack_proto_raw_tp = { .arg4_type = ARG_ANYTHING, }; +BPF_CALL_4(bpf_get_stack_sleepable_raw_tp, struct bpf_raw_tracepoint_args *, args, + void *, buf, u32, size, u64, flags) +{ + struct pt_regs *regs = get_bpf_raw_tp_regs(); + int ret; + + if (IS_ERR(regs)) + return PTR_ERR(regs); + + perf_fetch_caller_regs(regs); + ret = bpf_get_stack_sleepable((unsigned long) regs, (unsigned long) buf, + (unsigned long) size, flags, 0); + put_bpf_raw_tp_regs(); + return ret; +} + +static const struct bpf_func_proto bpf_get_stack_sleepable_proto_raw_tp = { + .func = bpf_get_stack_sleepable_raw_tp, + .gpl_only = true, + .ret_type = RET_INTEGER, + .arg1_type = ARG_PTR_TO_CTX, + .arg2_type = ARG_PTR_TO_UNINIT_MEM, + .arg3_type = ARG_CONST_SIZE_OR_ZERO, + .arg4_type = ARG_ANYTHING, +}; + static const struct bpf_func_proto * raw_tp_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) { @@ -1714,7 +1741,8 @@ raw_tp_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) case BPF_FUNC_get_stackid: return &bpf_get_stackid_proto_raw_tp; case BPF_FUNC_get_stack: - return &bpf_get_stack_proto_raw_tp; + return prog->sleepable ? &bpf_get_stack_sleepable_proto_raw_tp + : &bpf_get_stack_proto_raw_tp; case BPF_FUNC_get_attach_cookie: return &bpf_get_attach_cookie_proto_tracing; default: