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Despite the implication (process has pending signals -> the current thread marked for AST and has TDF_NEEDSIGCHK set) is not true due to other thread might manipulate its signal blocking mask, it should still hold for the single-threaded processes. Enable check for the condition for single-threaded case, and replicate it from userret() to ast() as well, where we check that ast indeed has no signal to deliver. Note that the check is under DIAGNOSTIC, it is not enabled for INVARIANTS but !DIAGNOSTIC since it imposes too heavy-weight locking for day-to-day used debugging kernel. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week
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