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    Subject[PATCH] tracing/stack-tracer: avoid races accessing file
    Date
    ---
    kernel/trace/trace.c | 10 +++++-----
    1 files changed, 5 insertions(+), 5 deletions(-)

    diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
    index 4c3bd82..48d1536 100644
    --- a/kernel/trace/trace.c
    +++ b/kernel/trace/trace.c
    @@ -1470,13 +1470,13 @@ static inline int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
    file = vma->vm_file;
    vmstart = vma->vm_start;
    }
    + if (file) {
    + ret = trace_seq_path(s, &file->f_path);
    + if (ret)
    + ret = trace_seq_printf(s, "[+0x%lx]", ip - vmstart);
    + }
    up_read(&mm->mmap_sem);
    }
    - if (file) {
    - ret = trace_seq_path(s, &file->f_path);
    - if (ret)
    - ret = trace_seq_printf(s, "[+0x%lx]", ip - vmstart);
    - }
    if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
    ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
    return ret;
    --
    1.5.6.5


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