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mirror_zfs/module/zfs
Ameer Hamza 5b93d1a218 L2ARC: Fix prev_hdr use-after-free in l2arc_write_sublist
prev_hdr is dereferenced after the sublist lock is dropped for write I/O
but nothing prevents it from being freed during that window. Eliminate
prev_hdr entirely and simplify persistent marker repositioning logic.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>
Closes #18289
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