From: Alexander Aring Date: Sun, 22 Nov 2020 23:10:24 +0000 (-0500) Subject: gfs2: Fix deadlock dumping resource group glocks X-Git-Tag: v5.10.7~1066^2~5 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=16e6281b6b22b0178eab95c6a82502d7b10f67b8;p=platform%2Fkernel%2Flinux-rpi.git gfs2: Fix deadlock dumping resource group glocks Commit 0e539ca1bbbe ("gfs2: Fix NULL pointer dereference in gfs2_rgrp_dump") introduced additional locking in gfs2_rgrp_go_dump, which is also used for dumping resource group glocks via debugfs. However, on that code path, the glock spin lock is already taken in dump_glock, and taking it again in gfs2_glock2rgrp leads to deadlock. This can be reproduced with: $ mkfs.gfs2 -O -p lock_nolock /dev/FOO $ mount /dev/FOO /mnt/foo $ touch /mnt/foo/bar $ cat /sys/kernel/debug/gfs2/FOO/glocks Fix that by not taking the glock spin lock inside the go_dump callback. Fixes: 0e539ca1bbbe ("gfs2: Fix NULL pointer dereference in gfs2_rgrp_dump") Signed-off-by: Alexander Aring Signed-off-by: Andreas Gruenbacher --- diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c index 67f2921..6cedeef 100644 --- a/fs/gfs2/glops.c +++ b/fs/gfs2/glops.c @@ -245,7 +245,7 @@ static void rgrp_go_inval(struct gfs2_glock *gl, int flags) static void gfs2_rgrp_go_dump(struct seq_file *seq, struct gfs2_glock *gl, const char *fs_id_buf) { - struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(gl); + struct gfs2_rgrpd *rgd = gl->gl_object; if (rgd) gfs2_rgrp_dump(seq, rgd, fs_id_buf);