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From 76b03619435d0b2f0125ee7aa5c94f2b889247de Mon Sep 17 00:00:00 2001
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From: Hanna Reitz <hreitz@redhat.com>
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Date: Fri, 4 Feb 2022 12:10:08 +0100
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Subject: [PATCH 4/8] block/nbd: Assert there are no timers when closed
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RH-Author: Hanna Reitz <hreitz@redhat.com>
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RH-MergeRequest: 74: block/nbd: Handle AioContext changes
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RH-Commit: [2/6] 56903457ca35d9c596aeb6827a48f80e8eabd66a (hreitz/qemu-kvm-c-9-s)
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RH-Bugzilla: 2033626
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Eric Blake <eblake@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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Our two timers must not remain armed beyond nbd_clear_bdrvstate(), or
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they will access freed data when they fire.
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This patch is separate from the patches that actually fix the issue
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(HEAD^^ and HEAD^) so that you can run the associated regression iotest
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(281) on a configuration that reproducibly exposes the bug.
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Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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Signed-off-by: Hanna Reitz <hreitz@redhat.com>
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Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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(cherry picked from commit 8a39c381e5e407d2fe5500324323f90a8540fa90)
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Conflict:
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- block/nbd.c: open_timer was introduced after the 6.2 release (for
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nbd's @open-timeout parameter), and has not been backported, so drop
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the assertion that it is NULL
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Signed-off-by: Hanna Reitz <hreitz@redhat.com>
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---
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block/nbd.c | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/block/nbd.c b/block/nbd.c
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index b8e5a9b4cc..aab20125d8 100644
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--- a/block/nbd.c
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+++ b/block/nbd.c
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@@ -108,6 +108,9 @@ static void nbd_clear_bdrvstate(BlockDriverState *bs)
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yank_unregister_instance(BLOCKDEV_YANK_INSTANCE(bs->node_name));
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+ /* Must not leave timers behind that would access freed data */
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+ assert(!s->reconnect_delay_timer);
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+
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object_unref(OBJECT(s->tlscreds));
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qapi_free_SocketAddress(s->saddr);
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s->saddr = NULL;
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--
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2.27.0
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