Messages in this thread | | | Date | Sat, 12 Oct 2013 21:22:03 +0200 | From | Oleg Nesterov <> | Subject | perf_event_mmap(vma) && !vma->vm_mm |
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Hi,
I am fighting with uprobe bug, and perf_event_mmap() complicates the problem, it is the only reason (afaics) why the forking task can not do install_special_mapping(new_child_mm). This means that the child should do this itself, say, from task_work_run() but this way it can't handle the error if get_xol_area() fails, too late to abort the already finished copy_process().
But please ignore, the only question is that I can't understand this
if (!vma->vm_mm) { name = strncpy(tmp, "[vdso]", sizeof(tmp)); goto got_name; }
code in perf_event_mmap_event() and I am just curious. How it is possible that vma->vm_mm == NULL ? perf_event_mmap(vma) is never called with, say, vma == gate_vma. And even if it was possible arch_vma_name() should handle this case?
Thanks,
Oleg.
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