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Add coverage for entry uprobes installed on CALL instructions while user shadow stack is enabled. The test puts an entry uprobe on a helper whose first instruction is a relative CALL, then verifies that the call/return sequence completes without SIGSEGV. This catches regressions where x86 uprobe CALL emulation updates the regular user stack but leaves the CET shadow stack stale. Signed-off-by: David Windsor <dwindsor@gmail.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://patch.msgid.link/b957039191118c5eba97d01d80c494b859f115a6.1782777969.git.dwindsor@gmail.com