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ktrace: Use STAILQ_EMPTY_ATOMIC when checking for records in userret()
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Authored by markj on Mar 21 2025, 2:09 PM.
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Details

Summary

As in commit 36631977d8c9, this check is unlocked and may trigger
spurious assertion failures. Use STAILQ_EMPTY_ATOMIC() here as well.
Fix nearby whitespace.

Reported by: syzkaller
Fixes: 34740937f7a4 ("queue: New debug macros for STAILQ")

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rG FreeBSD src repository
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