Fix rare bug in read_stream.c's split IO handling. The internal queue of buffers could become corrupted in a rare edge case that failed to invalidate an entry, causing a stale buffer to be "forwarded" to StartReadBuffers(). This is a simple fix for the immediate problem.
A small API change might be able to remove this and related fragility entirely, but that will have to wait a bit. Defect in commit ed0b87ca. Bug: 19006 Backpatch-through: 18 Reported-by: Alexander Lakhin <exclus...@gmail.com> Reviewed-by: Tom Lane <t...@sss.pgh.pa.us> Reviewed-by: Michael Paquier <mich...@paquier.xyz> Reviewed-by: Xuneng Zhou <xunengz...@gmail.com> Discussion: https://postgr.es/m/19006-80fcaaf69000377e%40postgresql.org Branch ------ REL_18_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/9110d81641696b95ea55f3a15dd0907ec0743529 Modified Files -------------- src/backend/storage/aio/read_stream.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+)
