database/sql: deadlock on transaction stmt context cancel [1.15 backport] #42884
Description
@pjm0616 requested issue #40985 (fixed by d4c1ad8 and d8044a6 in Go 1.16) to be considered for backport to the next 1.15 minor release.
@gopherbot @odeke-em Please consider this for backport to 1.15 and 1.14.
This regression, introduced in 1.14.6 and 1.15(by #34775), has a serious impact(deadlock) and no workarounds, other than patching Go manually.