Ceph » rbd

The function get_rollback_snap_id generates core dump when force promoting image

#14 0x00007f53848c4a55 in std::__throw_bad_variant_access (__what=__what@entry=0x7f5384d26040 "std::get: wrong index for variant") at /usr/include/c++/12/variant:1324
#15 0x00007f53848c4a76 in std::__throw_bad_variant_access (__valueless=<optimized out>) at /usr/include/c++/12/variant:1332
#16 0x00007f5384a52097 in std::get<3ul, cls::rbd::UserSnapshotNamespace, cls::rbd::GroupSnapshotNamespace, cls::rbd::TrashSnapshotNamespace, cls::rbd::MirrorSnapshotNamespace, cls::rbd::UnknownSnapshotNamespace> (__v=...)
    at /usr/include/c++/12/variant:1689
#17 std::get<cls::rbd::MirrorSnapshotNamespace, cls::rbd::UserSnapshotNamespace, cls::rbd::GroupSnapshotNamespace, cls::rbd::TrashSnapshotNamespace, cls::rbd::MirrorSnapshotNamespace, cls::rbd::UnknownSnapshotNamespace> (__v=...)
    at /usr/include/c++/12/variant:1127
#18 librbd::mirror::snapshot::util::(anonymous namespace)::get_rollback_snap_id (it=..., end=..., rollback_snap_id=rollback_snap_id@entry=0x55619ffc96c0, cct=cct@entry=0x55619ff68940)
    at /sdb/choffman/code/fork/ceph/src/librbd/mirror/snapshot/Utils.cc:31
#19 0x00007f5384a5285b in librbd::mirror::snapshot::util::can_create_primary_snapshot<librbd::ImageCtx> (image_ctx=0x55619ffcef60, demoted=demoted@entry=false, force=force@entry=true, 
    requires_orphan=requires_orphan@entry=0x7f5379cae3af, rollback_snap_id=rollback_snap_id@entry=0x55619ffc96c0) at /sdb/choffman/code/fork/ceph/src/librbd/mirror/snapshot/Utils.cc:117
#20 0x00007f5384a4d86e in librbd::mirror::snapshot::PromoteRequest<librbd::ImageCtx>::send (this=0x55619ffc9690) at /sdb/choffman/code/fork/ceph/src/librbd/mirror/snapshot/PromoteRequest.cc:37
#21 0x00007f5384a463b8 in librbd::mirror::PromoteRequest<librbd::ImageCtx>::promote (this=this@entry=0x7f533c0063f0) at /sdb/choffman/code/fork/ceph/src/librbd/mirror/PromoteRequest.cc:83
#22 0x00007f5384a46543 in librbd::mirror::PromoteRequest<librbd::ImageCtx>::handle_get_info (this=0x7f533c0063f0, r=0) at /sdb/choffman/code/fork/ceph/src/librbd/mirror/PromoteRequest.cc:68

The line of code in function

    auto mirror_ns = std::get<cls::rbd::MirrorSnapshotNamespace>(
      it->second.snap_namespace);

Steps to reproduce

bin/rbd --cluster site-a snap create data/image1@snap0
timeout 1m bin/rbd --cluster site-a bench --io-type write --io-size 64K --io-threads 2 --io-total 50G --io-pattern seq data/image1
bin/rbd --cluster site-a mirror image snapshot data/image1
sleep 10s
bin/rbd --cluster site-b  mirror image promote data/image1 --force