On Tue, 16 Oct 2018 08:42:14 -0400, valdis.kletnieks@xxxxxx said: > [~] zgrep CGROUP /proc/config.gz > CONFIG_CGROUPS=y > CONFIG_BLK_CGROUP=y > # CONFIG_DEBUG_BLK_CGROUP is not set > (...) > Looks like I should enable DEBUG_BLK_CGROUP and see what that says. Built next-20181016 with that enabled - and the exact same kablam. Started looking at the code, and I noticed that if the .config has CONFIG_IOSCHED_CFQ=y # CONFIG_CFQ_GROUP_IOSCHED is not set CONFIG_BLK_CGROUP=y then the 'struct cfqg_stats' at line 185 of block/cfq-iosched.c ends up being zero length (which hints that combo of config variables is a pathological case). I haven't delved through all the #ifdef'ery, but I wonder if there may be other corner-case issues with that combo....
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