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The count of chunks in a microzap block is stored as an uint16_t (mze_chunkid). Each chunk is 64 bytes, and the first is used to store a header, so there are 32767 usable chunks, which is just under 2M. 1M is the largest power-2-rounded block size under 2M, so we must set the limit there. If it goes higher, the loop in mzap_addent can overflow and fall into the PANIC case. Sponsored-by: Klara, Inc. Sponsored-by: Wasabi Technology, Inc. Reviewed-by: Alexander Motin <mav@FreeBSD.org> Signed-off-by: Rob Norris <rob.norris@klarasystems.com> Closes #16888