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From 3ee3fef23ff91d6bf974820b4dbe8280c6ad27b2 Mon Sep 17 00:00:00 2001
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From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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Date: Fri, 22 Jun 2018 19:00:04 +0200
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Subject: [PATCH 16/21] migration: not wait RDMA_CM_EVENT_DISCONNECTED event
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after rdma_disconnect
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RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Message-id: <20180801135522.11658-18-dgilbert@redhat.com>
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Patchwork-id: 81572
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O-Subject: [qemu-kvm RHEL8/virt212 PATCH 17/18] migration: not wait RDMA_CM_EVENT_DISCONNECTED event after rdma_disconnect
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Bugzilla: 1594384
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Juan Quintela <quintela@redhat.com>
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From: Lidong Chen <jemmy858585@gmail.com>
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When cancel migration during RDMA precopy, the source qemu main thread hangs sometime.
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The backtrace is:
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(gdb) bt
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#0 0x00007f249eabd43d in write () from /lib64/libpthread.so.0
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#1 0x00007f24a1ce98e4 in rdma_get_cm_event (channel=0x4675d10, event=0x7ffe2f643dd0) at src/cma.c:2189
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#2 0x00000000007b6166 in qemu_rdma_cleanup (rdma=0x6784000) at migration/rdma.c:2296
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#3 0x00000000007b7cae in qio_channel_rdma_close (ioc=0x3bfcc30, errp=0x0) at migration/rdma.c:2999
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#4 0x00000000008db60e in qio_channel_close (ioc=0x3bfcc30, errp=0x0) at io/channel.c:273
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#5 0x00000000007a8765 in channel_close (opaque=0x3bfcc30) at migration/qemu-file-channel.c:98
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#6 0x00000000007a71f9 in qemu_fclose (f=0x527c000) at migration/qemu-file.c:334
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#7 0x0000000000795b96 in migrate_fd_cleanup (opaque=0x3b46280) at migration/migration.c:1162
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#8 0x000000000093a71b in aio_bh_call (bh=0x3db7a20) at util/async.c:90
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#9 0x000000000093a7b2 in aio_bh_poll (ctx=0x3b121c0) at util/async.c:118
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#10 0x000000000093f2ad in aio_dispatch (ctx=0x3b121c0) at util/aio-posix.c:436
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#11 0x000000000093ab41 in aio_ctx_dispatch (source=0x3b121c0, callback=0x0, user_data=0x0)
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at util/async.c:261
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#12 0x00007f249f73c7aa in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
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#13 0x000000000093dc5e in glib_pollfds_poll () at util/main-loop.c:215
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#14 0x000000000093dd4e in os_host_main_loop_wait (timeout=28000000) at util/main-loop.c:263
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#15 0x000000000093de05 in main_loop_wait (nonblocking=0) at util/main-loop.c:522
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#16 0x00000000005bc6a5 in main_loop () at vl.c:1944
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#17 0x00000000005c39b5 in main (argc=56, argv=0x7ffe2f6443f8, envp=0x3ad0030) at vl.c:4752
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It does not get the RDMA_CM_EVENT_DISCONNECTED event after rdma_disconnect sometime.
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According to IB Spec once active side send DREQ message, it should wait for DREP message
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and only once it arrived it should trigger a DISCONNECT event. DREP message can be dropped
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due to network issues.
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For that case the spec defines a DREP_timeout state in the CM state machine, if the DREP is
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dropped we should get a timeout and a TIMEWAIT_EXIT event will be trigger.
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Unfortunately the current kernel CM implementation doesn't include the DREP_timeout state
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and in above scenario we will not get DISCONNECT or TIMEWAIT_EXIT events.
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So it should not invoke rdma_get_cm_event which may hang forever, and the event channel
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is also destroyed in qemu_rdma_cleanup.
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Signed-off-by: Lidong Chen <lidongchen@tencent.com>
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Reviewed-by: Juan Quintela <quintela@redhat.com>
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Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Signed-off-by: Juan Quintela <quintela@redhat.com>
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(cherry picked from commit c5e76115ccb4979cec795a8ae38becd07c2fde9f)
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---
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migration/rdma.c | 12 ++----------
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migration/trace-events | 1 -
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2 files changed, 2 insertions(+), 11 deletions(-)
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diff --git a/migration/rdma.c b/migration/rdma.c
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index 7d233b0..6e29ebf 100644
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--- a/migration/rdma.c
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+++ b/migration/rdma.c
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@@ -2268,8 +2268,7 @@ static int qemu_rdma_write(QEMUFile *f, RDMAContext *rdma,
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static void qemu_rdma_cleanup(RDMAContext *rdma)
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{
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- struct rdma_cm_event *cm_event;
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- int ret, idx;
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+ int idx;
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if (rdma->cm_id && rdma->connected) {
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if ((rdma->error_state ||
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@@ -2283,14 +2282,7 @@ static void qemu_rdma_cleanup(RDMAContext *rdma)
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qemu_rdma_post_send_control(rdma, NULL, &head;;
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}
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- ret = rdma_disconnect(rdma->cm_id);
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- if (!ret) {
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- trace_qemu_rdma_cleanup_waiting_for_disconnect();
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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- ret = rdma_get_cm_event(rdma->channel, &cm_event);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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- if (!ret) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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- rdma_ack_cm_event(cm_event);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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- }
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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- }
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+ rdma_disconnect(rdma->cm_id);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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trace_qemu_rdma_cleanup_disconnect();
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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rdma->connected = false;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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}
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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diff --git a/migration/trace-events b/migration/trace-events
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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index a180d7b..92b3179 100644
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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--- a/migration/trace-events
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+++ b/migration/trace-events
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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@@ -123,7 +123,6 @@ qemu_rdma_accept_pin_state(bool pin) "%d"
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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qemu_rdma_accept_pin_verbsc(void *verbs) "Verbs context after listen: %p"
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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qemu_rdma_block_for_wrid_miss(const char *wcompstr, int wcomp, const char *gcompstr, uint64_t req) "A Wanted wrid %s (%d) but got %s (%" PRIu64 ")"
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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qemu_rdma_cleanup_disconnect(void) ""
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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-qemu_rdma_cleanup_waiting_for_disconnect(void) ""
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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qemu_rdma_close(void) ""
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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qemu_rdma_connect_pin_all_requested(void) ""
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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qemu_rdma_connect_pin_all_outcome(bool pin) "%d"
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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--
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1.8.3.1
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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