Re: [syzbot] [trace?] WARNING in tracing_buffers_mmap_close (3)
From: Qing Wang <hidden>
Date: 2026-02-26 08:00:26
Also in:
lkml
Subsystem:
the rest, tracing · Maintainers:
Linus Torvalds, Steven Rostedt, Masami Hiramatsu
#syz test
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 23de3719f495..72b39295a8b0 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c@@ -8213,6 +8213,14 @@ static inline int get_snapshot_map(struct trace_array *tr) { return 0; } static inline void put_snapshot_map(struct trace_array *tr) { } #endif +static void tracing_buffers_mmap_open(struct vm_area_struct *vma) +{ + struct ftrace_buffer_info *info = vma->vm_file->private_data; + struct trace_iterator *iter = &info->iter; + + WARN_ON(ring_buffer_map(iter->array_buffer->buffer, iter->cpu_file, vma)); +} + static void tracing_buffers_mmap_close(struct vm_area_struct *vma) { struct ftrace_buffer_info *info = vma->vm_file->private_data;
@@ -8232,6 +8240,7 @@ static int tracing_buffers_may_split(struct vm_area_struct *vma, unsigned long a } static const struct vm_operations_struct tracing_buffers_vmops = { + .open = tracing_buffers_mmap_open, .close = tracing_buffers_mmap_close, .may_split = tracing_buffers_may_split, };