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From 93a7832d5dfd83f170119e7130f3968fe37fa8e6 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= <philmd@redhat.com>
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Date: Fri, 13 Sep 2019 14:16:25 +0100
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Subject: [PATCH 08/22] virtio-blk: Cancel the pending BH when the dataplane is
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reset
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Philippe Mathieu-Daudé <philmd@redhat.com>
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Message-id: <20190913141625.12521-2-philmd@redhat.com>
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Patchwork-id: 90453
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O-Subject: [RHEL-7.7.z qemu-kvm-rhev + RHEL-8.1.0 qemu-kvm + RHEL-AV-8.1.0 qemu-kvm PATCH v2 1/1] virtio-blk: Cancel the pending BH when the dataplane is reset
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Bugzilla: 1708459
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Danilo de Paula <ddepaula@redhat.com>
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When 'system_reset' is called, the main loop clear the memory
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region cache before the BH has a chance to execute. Later when
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the deferred function is called, some assumptions that were
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made when scheduling them are no longer true when they actually
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execute.
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This is what happens using a virtio-blk device (fresh RHEL7.8 install):
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$ (sleep 12.3; echo system_reset; sleep 12.3; echo system_reset; sleep 1; echo q) \
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| qemu-system-x86_64 -m 4G -smp 8 -boot menu=on \
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-device virtio-blk-pci,id=image1,drive=drive_image1 \
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-drive file=/var/lib/libvirt/images/rhel78.qcow2,if=none,id=drive_image1,format=qcow2,cache=none \
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-device virtio-net-pci,netdev=net0,id=nic0,mac=52:54:00:c4:e7:84 \
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-netdev tap,id=net0,script=/bin/true,downscript=/bin/true,vhost=on \
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-monitor stdio -serial null -nographic
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(qemu) system_reset
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(qemu) system_reset
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(qemu) qemu-system-x86_64: hw/virtio/virtio.c:225: vring_get_region_caches: Assertion `caches != NULL' failed.
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Aborted
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(gdb) bt
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Thread 1 (Thread 0x7f109c17b680 (LWP 10939)):
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#0 0x00005604083296d1 in vring_get_region_caches (vq=0x56040a24bdd0) at hw/virtio/virtio.c:227
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#1 0x000056040832972b in vring_avail_flags (vq=0x56040a24bdd0) at hw/virtio/virtio.c:235
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#2 0x000056040832d13d in virtio_should_notify (vdev=0x56040a240630, vq=0x56040a24bdd0) at hw/virtio/virtio.c:1648
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#3 0x000056040832d1f8 in virtio_notify_irqfd (vdev=0x56040a240630, vq=0x56040a24bdd0) at hw/virtio/virtio.c:1662
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#4 0x00005604082d213d in notify_guest_bh (opaque=0x56040a243ec0) at hw/block/dataplane/virtio-blk.c:75
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#5 0x000056040883dc35 in aio_bh_call (bh=0x56040a243f10) at util/async.c:90
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#6 0x000056040883dccd in aio_bh_poll (ctx=0x560409161980) at util/async.c:118
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#7 0x0000560408842af7 in aio_dispatch (ctx=0x560409161980) at util/aio-posix.c:460
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#8 0x000056040883e068 in aio_ctx_dispatch (source=0x560409161980, callback=0x0, user_data=0x0) at util/async.c:261
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#9 0x00007f10a8fca06d in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
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#10 0x0000560408841445 in glib_pollfds_poll () at util/main-loop.c:215
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#11 0x00005604088414bf in os_host_main_loop_wait (timeout=0) at util/main-loop.c:238
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#12 0x00005604088415c4 in main_loop_wait (nonblocking=0) at util/main-loop.c:514
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#13 0x0000560408416b1e in main_loop () at vl.c:1923
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#14 0x000056040841e0e8 in main (argc=20, argv=0x7ffc2c3f9c58, envp=0x7ffc2c3f9d00) at vl.c:4578
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Fix this by cancelling the BH when the virtio dataplane is stopped.
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[This is version of the patch was modified as discussed with Philippe on
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the mailing list thread.
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--Stefan]
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Reported-by: Yihuang Yu <yihyu@redhat.com>
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Suggested-by: Stefan Hajnoczi <stefanha@redhat.com>
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Fixes: https://bugs.launchpad.net/qemu/+bug/1839428
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Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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Message-Id: <20190816171503.24761-1-philmd@redhat.com>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit ebb6ff25cd888a52a64a9adc3692541c6d1d9a42)
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Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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hw/block/dataplane/virtio-blk.c | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/hw/block/dataplane/virtio-blk.c b/hw/block/dataplane/virtio-blk.c
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index 101f32c..23e4022 100644
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--- a/hw/block/dataplane/virtio-blk.c
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+++ b/hw/block/dataplane/virtio-blk.c
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@@ -292,6 +292,9 @@ void virtio_blk_data_plane_stop(VirtIODevice *vdev)
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virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), i);
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}
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+ qemu_bh_cancel(s->bh);
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+ notify_guest_bh(s); /* final chance to notify guest */
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+
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/* Clean up guest notifier (irq) */
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k->set_guest_notifiers(qbus->parent, nvqs, false);
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--
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1.8.3.1
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