re: kern/50430: syscall_disestablish() can remove active syscalls

[christos%zoulas.com@localhost (Christos Zoulas)]

On Nov 15,  8:25pm, mrg%eterna.com.au@localhost (matthew green) wrote:
-- Subject: re: kern/50430: syscall_disestablish() can remove active syscalls

|  until bug is fixed, can we disable the autounload?

Sure, that sounds prudent. It is difficult to fix properly. One way to do
this would be to mark all lwps that have used compat syscalls with a bit
depending on the module they have used, and refuse to unload the module
until the lwp is gone.

- when load a module that has compat syscalls, assign to it a bit.
- mark a flags field of all syscalls that were loaded with that module
  with that bit.
- or the lwp flags with the syscall flags on each syscall.
- when it is time to unload check that no lwp has that bit in the flags set.
- instead of keeping l_sysent, keep l_sysmodflags or something.

christos