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[Bug 1890360] Re: Assertion failure in address_space_unmap through virti


From: Stefan Hajnoczi
Subject: [Bug 1890360] Re: Assertion failure in address_space_unmap through virtio-blk
Date: Mon, 09 Nov 2020 10:44:50 -0000

Fix:

commit 7bd04a041addcdef6a03e6498aafaea55ca6e88b
Author: Stefan Hajnoczi <stefanha@redhat.com>
Date:   Thu Sep 17 10:44:54 2020 +0100

    virtio-blk: undo destructive iov_discard_*() operations

** Changed in: qemu
       Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/1890360

Title:
  Assertion failure in address_space_unmap through virtio-blk

Status in QEMU:
  Fix Committed

Bug description:
  Hello,
  Reproducer:
  cat << EOF | ./i386-softmmu/qemu-system-i386 \
  -drive id=mydrive,file=null-co://,size=2M,format=raw,if=none \
  -device virtio-blk,drive=mydrive \
  -nodefaults -nographic -qtest stdio
  outl 0xcf8 0x80001010
  outl 0xcfc 0xc001
  outl 0xcf8 0x80001014
  outl 0xcf8 0x80001004
  outw 0xcfc 0x7
  outl 0xc006 0x3aff9090
  outl 0xcf8 0x8000100e
  outl 0xcfc 0x41005e1e
  write 0x3b00002 0x1 0x5e
  write 0x3b00004 0x1 0x5e
  write 0x3aff5e6 0x1 0x11
  write 0x3aff5eb 0x1 0xc6
  write 0x3aff5ec 0x1 0xc6
  write 0x7 0x1 0xff
  write 0x8 0x1 0xfb
  write 0xc 0x1 0x11
  write 0xe 0x1 0x5e
  write 0x5e8 0x1 0x11
  write 0x5ec 0x1 0xc6
  outl 0x410e 0x10e
  EOF

  
  qemu-fuzz-i386: /exec.c:3623: void address_space_unmap(AddressSpace *, void 
*, hwaddr, _Bool, hwaddr): Assertion `mr != NULL' failed.
  ==789== ERROR: libFuzzer: deadly signal
      #8  in __assert_fail /build/glibc-GwnBeO/glibc-2.30/assert/assert.c:101:3
      #9  in address_space_unmap /exec.c:3623:9
      #10 in dma_memory_unmap /include/sysemu/dma.h:145:5
      #11 in virtqueue_unmap_sg /hw/virtio/virtio.c:690:9
      #12 in virtqueue_fill /hw/virtio/virtio.c:843:5
      #13 in virtqueue_push /hw/virtio/virtio.c:917:5
      #14 in virtio_blk_req_complete /hw/block/virtio-blk.c:83:5
      #15 in virtio_blk_handle_request /hw/block/virtio-blk.c:671:13
      #16 in virtio_blk_handle_vq /hw/block/virtio-blk.c:780:17
      #17 in virtio_queue_notify_aio_vq /hw/virtio/virtio.c:2324:15
      #18 in virtio_queue_host_notifier_aio_read /hw/virtio/virtio.c:3495:9
      #19 in aio_dispatch_handler /util/aio-posix.c:328:9
      #20 in aio_dispatch_handlers /util/aio-posix.c:371:20
      #21 in aio_dispatch /util/aio-posix.c:381:5
      #22 in aio_ctx_dispatch /util/async.c:306:5
      #23 in g_main_context_dispatch

  
  With -trace virtio\*

  ...
  [S +0.099667] OK
  [R +0.099681] write 0x5ec 0x1 0xc6
  OK
  [S +0.099690] OK
  [R +0.099700] outl 0x410e 0x10e
  29575@1596590112.074339:virtio_queue_notify vdev 0x62d000030590 n 0 vq 
0x7f9b93fc9800
  29575@1596590112.074423:virtio_blk_data_plane_start dataplane 0x60600000f260
  OK
  [S +0.099833] OK
  29575@1596590112.076459:virtio_queue_notify vdev 0x62d000030590 n 0 vq 
0x7f9b93fc9800
  29575@1596590112.076642:virtio_blk_handle_read vdev 0x62d000030590 req 
0x611000043e80 sector 0 nsectors 0
  29575@1596590112.076651:virtio_blk_req_complete vdev 0x62d000030590 req 
0x611000043e80 status 1
  qemu-system-i386: /home/alxndr/Development/qemu/general-fuzz/exec.c:3623: 
void address_space_unmap(AddressSpace *, void *, hwaddr, _Bool, hwaddr): 
Assertion `mr != NULL' failed.

  
  -Alex

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