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nvmf: Disconnect qpair whose ctrlr is not set yet when removing listener

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We have very frequent failures when we run test/nvmf/host/multipath.sh
in the test pool.

Call stack showed nvmf_stop_listen_disconnect_qpairs() accessed
qpair->ctrlr even if qpair->ctrlr was NULL.

nvmf_stop_listen_disconnect_qpairs() did not check if qpair->ctrlr is
not NULL before accessing qpair->ctrlr->subsys.

When a qpair is added to a poll group, qpair->ctrlr is cleared to NULL.

The test code test/nvmf/host/multipath.sh executes multiple
reconnects for path error.

So a conflict might occur between adding a qpair to a poll group and
disconnecting a qpair in a poll group.

In this case, it may be acceptable even if we disconnect a qpair whose
qpair->ctrlr is NULL. It will be better than SIGSEGV.

Fixes one of the issues in #2300

Signed-off-by: Shuhei Matsumoto <shuheimatsumoto@gmail.com>
Change-Id: I308fcb886dd410d01e3361c1850dec9a8eacbccf
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/10860
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com>
Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
This commit is contained in:
Shuhei Matsumoto 2021-12-28 13:52:22 +09:00 committed by Changpeng Liu
parent 833a5c9d2b
commit 44f69b654b
1 changed files with 1 additions and 1 deletions
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2
lib/nvmf/transport.c
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@ -410,7 +410,7 @@ nvmf_stop_listen_disconnect_qpairs(struct spdk_io_channel_iter *i)
} }
if (!spdk_nvme_transport_id_compare(&ctx->trid, &tmp_trid)) { if (!spdk_nvme_transport_id_compare(&ctx->trid, &tmp_trid)) {
if (ctx->subsystem == NULL || if (ctx->subsystem == NULL || qpair->ctrlr == NULL ||
ctx->subsystem == qpair->ctrlr->subsys) { ctx->subsystem == qpair->ctrlr->subsys) {
spdk_nvmf_qpair_disconnect(qpair, NULL, NULL); spdk_nvmf_qpair_disconnect(qpair, NULL, NULL);
} }