On Tue, Oct 30, 2018 at 12:05 AM Theodore Y. Ts'o <tytso@xxxxxxx> wrote: > > On Mon, Oct 29, 2018 at 09:31:58AM +0100, Miklos Szeredi wrote: > > Can you please post > > > > grep OVERLAY_FS .config > > Sure, here you go: > > % zgrep OVERLAY_FS /proc/config.gz > CONFIG_OVERLAY_FS=m > CONFIG_OVERLAY_FS_REDIRECT_DIR=y > CONFIG_OVERLAY_FS_REDIRECT_ALWAYS_FOLLOW=y > CONFIG_OVERLAY_FS_INDEX=y > # CONFIG_OVERLAY_FS_XINO_AUTO is not set > CONFIG_OVERLAY_FS_METACOPY=y > > And this was the config on the working 4.18 kernel: > > % grep OVERLAY_FS /boot/config-4.18.0-2-amd64 > CONFIG_OVERLAY_FS=m > # CONFIG_OVERLAY_FS_REDIRECT_DIR is not set > CONFIG_OVERLAY_FS_REDIRECT_ALWAYS_FOLLOW=y > # CONFIG_OVERLAY_FS_INDEX is not set > # CONFIG_OVERLAY_FS_XINO_AUTO is not set > So let's try to bisect the offending feature first. If we can't find an offending feature, then there may be an offending commit in 4.18..4.19 With kernel 4.19, please try to reproduce after: echo N > /sys/module/overlay/parameters/metacopy and then after: echo N > /sys/module/overlay/parameters/index and then after: echo N > /sys/module/overlay/parameters/redirect_dir With kernel 4.18, please try to reproduce after: echo Y > /sys/module/overlay/parameters/redirect_dir and then after: echo Y > /sys/module/overlay/parameters/index My immediate suspect w.r.t hardlink issues would be the index feature. FYI, I had already verified that unionmount testsuite passes on kernel 4.19 with same overlay config as your kernel 4.19. Thanks, Amir.
