[PATCH] Fix get_pathname() not handling stacked mounts This get_pathname() issue can be duplicated as follow: sudo mkdir -p /tmp/test sudo mount -t tmpfs tmpfs /tmp/test sudo mount --make-private /tmp/test sudo mount --bind /tmp/test /tmp/test sudo mount --bind /tmp/test /tmp/test sudo mount -o remount,ro /tmp/test $ sudo crash /usr/lib/debug/boot/vmlinux-$(uname -r) crash> mount | grep /tmp/test ffff9648e7febc00 ffff9648d91ac800 tmpfs tmpfs /tmp/test ffff9648c9281380 ffff9648d91ac800 tmpfs tmpfs /tmp/test/ ffff9648c8e9a700 ffff9648d91ac800 tmpfs tmpfs / The last mount is not printed properly, and this is impacting diagnostic when looking at vmcore from complex containers mount environments. Signed-off-by: Georges Aureau <georges.aureau(a)hpe.com&gt; -- diff --git a/filesys.c b/filesys.c index 8d13807..af6d616 100644 --- a/filesys.c +++ b/filesys.c @@ -3140,6 +3154,7 @@ get_pathname(ulong dentry, char *pathname, int length, int full, ulong vfsmnt) tmp_vfsmnt = vfsmnt; do { + more_vfsmnt: tmp_dentry = parent; dentry_buf = fill_dentry_cache(tmp_dentry); @@ -3195,6 +3210,7 @@ get_pathname(ulong dentry, char *pathname, int length, int full, ulong vfsmnt) break; else tmp_vfsmnt = mnt_parent; + goto more_vfsmnt; } } else if (VALID_STRUCT(mount)) { if (tmp_vfsmnt) { @@ -3213,6 +3229,7 @@ get_pathname(ulong dentry, char *pathname, int length, int full, ulong vfsmnt) break; else tmp_vfsmnt = mnt_parent + OFFSET(mount_mnt); + goto more_vfsmnt; } } else { @@ -3222,6 +3239,9 @@ get_pathname(ulong dentry, char *pathname, int length, int full, ulong vfsmnt) } } while (tmp_dentry != parent && parent); + if (!STREQ(pathname, "/") && LASTCHAR(pathname) == '/') { + LASTCHAR(pathname) = '\0'; + } if (mnt_buf) FREEBUF(mnt_buf);