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[Xen-devel] [qemu-mainline test] 139352: regressions - FAIL



flight 139352 qemu-mainline real [real]
http://logs.test-lab.xenproject.org/osstest/logs/139352/

Regressions :-(

Tests which did not succeed and are blocking,
including tests which could not be run:
 test-amd64-i386-xl-qemuu-dmrestrict-amd64-dmrestrict 12 
guest-start/debianhvm.repeat fail REGR. vs. 139300
 test-amd64-amd64-xl-qemuu-ovmf-amd64 18 guest-start/debianhvm.repeat fail 
REGR. vs. 139300

Tests which did not succeed, but are not blocking:
 test-amd64-amd64-xl-qemuu-win7-amd64 17 guest-stop            fail like 139300
 test-armhf-armhf-libvirt     14 saverestore-support-check    fail  like 139300
 test-amd64-i386-xl-qemuu-win7-amd64 17 guest-stop             fail like 139300
 test-armhf-armhf-libvirt-raw 13 saverestore-support-check    fail  like 139300
 test-amd64-amd64-xl-qemuu-ws16-amd64 17 guest-stop            fail like 139300
 test-amd64-i386-xl-pvshim    12 guest-start                  fail   never pass
 test-amd64-amd64-libvirt     13 migrate-support-check        fail   never pass
 test-amd64-i386-libvirt-xsm  13 migrate-support-check        fail   never pass
 test-amd64-amd64-libvirt-xsm 13 migrate-support-check        fail   never pass
 test-arm64-arm64-xl-seattle  13 migrate-support-check        fail   never pass
 test-arm64-arm64-xl-seattle  14 saverestore-support-check    fail   never pass
 test-amd64-i386-libvirt      13 migrate-support-check        fail   never pass
 test-amd64-i386-libvirt-qemuu-debianhvm-amd64-xsm 11 migrate-support-check 
fail never pass
 test-amd64-amd64-libvirt-qemuu-debianhvm-amd64-xsm 11 migrate-support-check 
fail never pass
 test-arm64-arm64-libvirt-xsm 13 migrate-support-check        fail   never pass
 test-arm64-arm64-libvirt-xsm 14 saverestore-support-check    fail   never pass
 test-arm64-arm64-xl-credit2  13 migrate-support-check        fail   never pass
 test-arm64-arm64-xl-credit2  14 saverestore-support-check    fail   never pass
 test-amd64-amd64-qemuu-nested-amd 17 debian-hvm-install/l1/l2  fail never pass
 test-arm64-arm64-xl-credit1  13 migrate-support-check        fail   never pass
 test-arm64-arm64-xl-credit1  14 saverestore-support-check    fail   never pass
 test-arm64-arm64-xl-thunderx 13 migrate-support-check        fail   never pass
 test-arm64-arm64-xl-thunderx 14 saverestore-support-check    fail   never pass
 test-arm64-arm64-xl          13 migrate-support-check        fail   never pass
 test-arm64-arm64-xl          14 saverestore-support-check    fail   never pass
 test-arm64-arm64-xl-xsm      13 migrate-support-check        fail   never pass
 test-arm64-arm64-xl-xsm      14 saverestore-support-check    fail   never pass
 test-amd64-amd64-libvirt-vhd 12 migrate-support-check        fail   never pass
 test-armhf-armhf-xl-arndale  13 migrate-support-check        fail   never pass
 test-armhf-armhf-xl-arndale  14 saverestore-support-check    fail   never pass
 test-armhf-armhf-xl-multivcpu 13 migrate-support-check        fail  never pass
 test-armhf-armhf-xl-multivcpu 14 saverestore-support-check    fail  never pass
 test-armhf-armhf-xl          13 migrate-support-check        fail   never pass
 test-armhf-armhf-xl-credit1  13 migrate-support-check        fail   never pass
 test-armhf-armhf-xl          14 saverestore-support-check    fail   never pass
 test-armhf-armhf-xl-credit1  14 saverestore-support-check    fail   never pass
 test-armhf-armhf-libvirt     13 migrate-support-check        fail   never pass
 test-armhf-armhf-xl-rtds     13 migrate-support-check        fail   never pass
 test-armhf-armhf-xl-rtds     14 saverestore-support-check    fail   never pass
 test-armhf-armhf-xl-credit2  13 migrate-support-check        fail   never pass
 test-armhf-armhf-xl-credit2  14 saverestore-support-check    fail   never pass
 test-armhf-armhf-xl-cubietruck 13 migrate-support-check        fail never pass
 test-armhf-armhf-xl-cubietruck 14 saverestore-support-check    fail never pass
 test-armhf-armhf-libvirt-raw 12 migrate-support-check        fail   never pass
 test-armhf-armhf-xl-vhd      12 migrate-support-check        fail   never pass
 test-armhf-armhf-xl-vhd      13 saverestore-support-check    fail   never pass
 test-amd64-i386-xl-qemuu-ws16-amd64 17 guest-stop              fail never pass
 test-amd64-amd64-xl-qemuu-win10-i386 10 windows-install        fail never pass
 test-amd64-i386-xl-qemuu-win10-i386 10 windows-install         fail never pass

version targeted for testing:
 qemuu                b43bea01b853dfdb6c0418615b57d0e1b98e9e98
baseline version:
 qemuu                bf8b024372bf8abf5a9f40bfa65eeefad23ff988

Last test of basis   139300  2019-07-24 03:20:41 Z    2 days
Failing since        139335  2019-07-25 11:37:28 Z    1 days    2 attempts
Testing same since   139352  2019-07-25 23:37:09 Z    0 days    1 attempts

------------------------------------------------------------
People who touched revisions under test:
  Ivan Ren <ivanren@xxxxxxxxxxx>
  Ivan Ren <renyime@xxxxxxxxx>
  Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
  Juan Quintela <quintela@xxxxxxxxxx>
  Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>
  Paolo Bonzini <pbonzini@xxxxxxxxxx>
  Peter Maydell <peter.maydell@xxxxxxxxxx>
  Zhengui li <lizhengui@xxxxxxxxxx>

jobs:
 build-amd64-xsm                                              pass    
 build-arm64-xsm                                              pass    
 build-i386-xsm                                               pass    
 build-amd64                                                  pass    
 build-arm64                                                  pass    
 build-armhf                                                  pass    
 build-i386                                                   pass    
 build-amd64-libvirt                                          pass    
 build-arm64-libvirt                                          pass    
 build-armhf-libvirt                                          pass    
 build-i386-libvirt                                           pass    
 build-amd64-pvops                                            pass    
 build-arm64-pvops                                            pass    
 build-armhf-pvops                                            pass    
 build-i386-pvops                                             pass    
 test-amd64-amd64-xl                                          pass    
 test-arm64-arm64-xl                                          pass    
 test-armhf-armhf-xl                                          pass    
 test-amd64-i386-xl                                           pass    
 test-amd64-amd64-libvirt-qemuu-debianhvm-amd64-xsm           pass    
 test-amd64-i386-libvirt-qemuu-debianhvm-amd64-xsm            pass    
 test-amd64-amd64-xl-qemuu-debianhvm-i386-xsm                 pass    
 test-amd64-i386-xl-qemuu-debianhvm-i386-xsm                  pass    
 test-amd64-amd64-libvirt-xsm                                 pass    
 test-arm64-arm64-libvirt-xsm                                 pass    
 test-amd64-i386-libvirt-xsm                                  pass    
 test-amd64-amd64-xl-xsm                                      pass    
 test-arm64-arm64-xl-xsm                                      pass    
 test-amd64-i386-xl-xsm                                       pass    
 test-amd64-amd64-qemuu-nested-amd                            fail    
 test-amd64-amd64-xl-pvhv2-amd                                pass    
 test-amd64-i386-qemuu-rhel6hvm-amd                           pass    
 test-amd64-amd64-xl-qemuu-debianhvm-amd64                    pass    
 test-amd64-i386-xl-qemuu-debianhvm-amd64                     pass    
 test-amd64-i386-freebsd10-amd64                              pass    
 test-amd64-amd64-xl-qemuu-ovmf-amd64                         fail    
 test-amd64-i386-xl-qemuu-ovmf-amd64                          pass    
 test-amd64-amd64-xl-qemuu-win7-amd64                         fail    
 test-amd64-i386-xl-qemuu-win7-amd64                          fail    
 test-amd64-amd64-xl-qemuu-ws16-amd64                         fail    
 test-amd64-i386-xl-qemuu-ws16-amd64                          fail    
 test-armhf-armhf-xl-arndale                                  pass    
 test-amd64-amd64-xl-credit1                                  pass    
 test-arm64-arm64-xl-credit1                                  pass    
 test-armhf-armhf-xl-credit1                                  pass    
 test-amd64-amd64-xl-credit2                                  pass    
 test-arm64-arm64-xl-credit2                                  pass    
 test-armhf-armhf-xl-credit2                                  pass    
 test-armhf-armhf-xl-cubietruck                               pass    
 test-amd64-amd64-xl-qemuu-dmrestrict-amd64-dmrestrict        pass    
 test-amd64-i386-xl-qemuu-dmrestrict-amd64-dmrestrict         fail    
 test-amd64-i386-freebsd10-i386                               pass    
 test-amd64-amd64-xl-qemuu-win10-i386                         fail    
 test-amd64-i386-xl-qemuu-win10-i386                          fail    
 test-amd64-amd64-qemuu-nested-intel                          pass    
 test-amd64-amd64-xl-pvhv2-intel                              pass    
 test-amd64-i386-qemuu-rhel6hvm-intel                         pass    
 test-amd64-amd64-libvirt                                     pass    
 test-armhf-armhf-libvirt                                     pass    
 test-amd64-i386-libvirt                                      pass    
 test-amd64-amd64-xl-multivcpu                                pass    
 test-armhf-armhf-xl-multivcpu                                pass    
 test-amd64-amd64-pair                                        pass    
 test-amd64-i386-pair                                         pass    
 test-amd64-amd64-libvirt-pair                                pass    
 test-amd64-i386-libvirt-pair                                 pass    
 test-amd64-amd64-amd64-pvgrub                                pass    
 test-amd64-amd64-i386-pvgrub                                 pass    
 test-amd64-amd64-xl-pvshim                                   pass    
 test-amd64-i386-xl-pvshim                                    fail    
 test-amd64-amd64-pygrub                                      pass    
 test-amd64-amd64-xl-qcow2                                    pass    
 test-armhf-armhf-libvirt-raw                                 pass    
 test-amd64-i386-xl-raw                                       pass    
 test-amd64-amd64-xl-rtds                                     pass    
 test-armhf-armhf-xl-rtds                                     pass    
 test-arm64-arm64-xl-seattle                                  pass    
 test-amd64-amd64-xl-qemuu-debianhvm-amd64-shadow             pass    
 test-amd64-i386-xl-qemuu-debianhvm-amd64-shadow              pass    
 test-amd64-amd64-xl-shadow                                   pass    
 test-amd64-i386-xl-shadow                                    pass    
 test-arm64-arm64-xl-thunderx                                 pass    
 test-amd64-amd64-libvirt-vhd                                 pass    
 test-armhf-armhf-xl-vhd                                      pass    


------------------------------------------------------------
sg-report-flight on osstest.test-lab.xenproject.org
logs: /home/logs/logs
images: /home/logs/images

Logs, config files, etc. are available at
    http://logs.test-lab.xenproject.org/osstest/logs

Explanation of these reports, and of osstest in general, is at
    http://xenbits.xen.org/gitweb/?p=osstest.git;a=blob;f=README.email;hb=master
    http://xenbits.xen.org/gitweb/?p=osstest.git;a=blob;f=README;hb=master

Test harness code can be found at
    http://xenbits.xen.org/gitweb?p=osstest.git;a=summary


Not pushing.

------------------------------------------------------------
commit b43bea01b853dfdb6c0418615b57d0e1b98e9e98
Merge: 7ea5324533 f193bc0c53
Author: Peter Maydell <peter.maydell@xxxxxxxxxx>
Date:   Thu Jul 25 12:09:12 2019 +0100

    Merge remote-tracking branch 
'remotes/juanquintela/tags/migration-pull-request' into staging
    
    Migration pull request
    
    This series fixes problems with migration-cancel while using multifd.
    In some cases it can hang waiting in a semaphore.
    
    Please apply.
    
    # gpg: Signature made Thu 25 Jul 2019 11:56:57 BST
    # gpg:                using RSA key 1899FF8EDEBF58CCEE034B82F487EF185872D723
    # gpg: Good signature from "Juan Quintela <quintela@xxxxxxxxxx>" [full]
    # gpg:                 aka "Juan Quintela <quintela@xxxxxxxxxx>" [full]
    # Primary key fingerprint: 1899 FF8E DEBF 58CC EE03  4B82 F487 EF18 5872 
D723
    
    * remotes/juanquintela/tags/migration-pull-request:
      migration: fix migrate_cancel multifd migration leads destination hung 
forever
      migration: Make explicit that we are quitting multifd
      migration: fix migrate_cancel leads live_migration thread hung forever
      migration: fix migrate_cancel leads live_migration thread endless loop
    
    Signed-off-by: Peter Maydell <peter.maydell@xxxxxxxxxx>

commit 7ea53245335b4f60b56a3323232baa39d9bb1ebb
Merge: bf8b024372 6baabe5cf8
Author: Peter Maydell <peter.maydell@xxxxxxxxxx>
Date:   Thu Jul 25 09:59:00 2019 +0100

    Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into 
staging
    
    Two more bugfix patches + 1 doc fix.
    
    # gpg: Signature made Wed 24 Jul 2019 10:22:06 BST
    # gpg:                using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
    # gpg:                issuer "pbonzini@xxxxxxxxxx"
    # gpg: Good signature from "Paolo Bonzini <bonzini@xxxxxxx>" [full]
    # gpg:                 aka "Paolo Bonzini <pbonzini@xxxxxxxxxx>" [full]
    # Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4  E2F7 7E15 100C CD36 
69B1
    #      Subkey fingerprint: F133 3857 4B66 2389 866C  7682 BFFB D25F 78C7 
AE83
    
    * remotes/bonzini/tags/for-upstream:
      docs: correct kconfig option
      i386/kvm: Do not sync nested state during runtime
      virtio-scsi: fixed virtio_scsi_ctx_check failed when detaching scsi disk
    
    Signed-off-by: Peter Maydell <peter.maydell@xxxxxxxxxx>

commit f193bc0c5342496ce07355c0c30394560a7f4738
Author: Ivan Ren <renyime@xxxxxxxxx>
Date:   Tue Jun 25 21:18:19 2019 +0800

    migration: fix migrate_cancel multifd migration leads destination hung 
forever
    
    When migrate_cancel a multifd migration, if run sequence like this:
    
            [source]                              [destination]
    
    multifd_send_sync_main[finish]
                                        multifd_recv_thread wait &p->sem_sync
    shutdown to_dst_file
                                        detect error from_src_file
    send  RAM_SAVE_FLAG_EOS[fail]       [no chance to run 
multifd_recv_sync_main]
                                        multifd_load_cleanup
                                        join multifd receive thread forever
    
    will lead destination qemu hung at following stack:
    
    pthread_join
    qemu_thread_join
    multifd_load_cleanup
    process_incoming_migration_co
    coroutine_trampoline
    
    Signed-off-by: Ivan Ren <ivanren@xxxxxxxxxxx>
    Reviewed-by: Dr. David Alan Gilbert <dgilbert@xxxxxxxxxx>
    Reviewed-by: Juan Quintela <quintela@xxxxxxxxxx>
    Message-Id: <1561468699-9819-4-git-send-email-ivanren@xxxxxxxxxxx>
    Signed-off-by: Juan Quintela <quintela@xxxxxxxxxx>

commit 3c3ca25d1f067f93876730cb55c59d43194fe815
Author: Juan Quintela <quintela@xxxxxxxxxx>
Date:   Wed Jul 24 11:46:24 2019 +0200

    migration: Make explicit that we are quitting multifd
    
    We add a bool to indicate that.
    
    Reviewed-by: Dr. David Alan Gilbert <dgilbert@xxxxxxxxxx>
    Signed-off-by: Juan Quintela <quintela@xxxxxxxxxx>

commit a3ec6b7d236593a95a197c229a1b673995105175
Author: Ivan Ren <renyime@xxxxxxxxx>
Date:   Tue Jun 25 21:18:18 2019 +0800

    migration: fix migrate_cancel leads live_migration thread hung forever
    
    When we 'migrate_cancel' a multifd migration, live_migration thread may
    hung forever at some points, because of multifd_send_thread has already
    exit for socket error:
    1. multifd_send_pages may hung at qemu_sem_wait(&multifd_send_state->
       channels_ready)
    2. multifd_send_sync_main my hung at qemu_sem_wait(&multifd_send_state->
       sem_sync)
    
    Signed-off-by: Ivan Ren <ivanren@xxxxxxxxxxx>
    Message-Id: <1561468699-9819-3-git-send-email-ivanren@xxxxxxxxxxx>
    Reviewed-by: Dr. David Alan Gilbert <dgilbert@xxxxxxxxxx>
    Reviewed-by: Juan Quintela <quintela@xxxxxxxxxx>
    Signed-off-by: Juan Quintela <quintela@xxxxxxxxxx>
    
    ---
    
    Remove spurious not needed bits

commit 713f762a316348b00f5a3713b5314c88ab0a5852
Author: Ivan Ren <renyime@xxxxxxxxx>
Date:   Tue Jun 25 21:18:17 2019 +0800

    migration: fix migrate_cancel leads live_migration thread endless loop
    
    When we 'migrate_cancel' a multifd migration, live_migration thread may
    go into endless loop in multifd_send_pages functions.
    
    Reproduce steps:
    
    (qemu) migrate_set_capability multifd on
    (qemu) migrate -d url
    (qemu) [wait a while]
    (qemu) migrate_cancel
    
    Then may get live_migration 100% cpu usage in following stack:
    
    pthread_mutex_lock
    qemu_mutex_lock_impl
    multifd_send_pages
    multifd_queue_page
    ram_save_multifd_page
    ram_save_target_page
    ram_save_host_page
    ram_find_and_save_block
    ram_find_and_save_block
    ram_save_iterate
    qemu_savevm_state_iterate
    migration_iteration_run
    migration_thread
    qemu_thread_start
    start_thread
    clone
    
    Signed-off-by: Ivan Ren <ivanren@xxxxxxxxxxx>
    Message-Id: <1561468699-9819-2-git-send-email-ivanren@xxxxxxxxxxx>
    Reviewed-by: Dr. David Alan Gilbert <dgilbert@xxxxxxxxxx>
    Reviewed-by: Juan Quintela <quintela@xxxxxxxxxx>
    Signed-off-by: Juan Quintela <quintela@xxxxxxxxxx>

commit 6baabe5cf8d42ce6bc542fb3ec0bfc10c0ee6c5e
Author: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>
Date:   Tue Jul 23 16:08:04 2019 +0400

    docs: correct kconfig option
    
    Signed-off-by: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>
    Message-Id: <20190723120804.29565-1-marcandre.lureau@xxxxxxxxxx>
    Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>

commit bec7156a45aa6712395a770646f7078b1fc82acd
Author: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Date:   Mon Jul 22 06:00:08 2019 +0200

    i386/kvm: Do not sync nested state during runtime
    
    Writing the nested state e.g. after a vmport access can invalidate
    important parts of the kernel-internal state, and it is not needed as
    well. So leave this out from KVM_PUT_RUNTIME_STATE.
    
    Suggested-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
    Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
    Message-Id: <bdd53f40-4e60-f3ae-7ec6-162198214953@xxxxxxxxxxx>
    Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>

commit 9c5aad84da1c37429d06c193f23a8df6445ed29e
Author: Zhengui li <lizhengui@xxxxxxxxxx>
Date:   Mon Jul 22 23:05:20 2019 +0200

    virtio-scsi: fixed virtio_scsi_ctx_check failed when detaching scsi disk
    
    commit a6f230c move blockbackend back to main AioContext on unplug. It set 
the AioContext of
    SCSIDevice to the main AioContex, but s->ctx is still the iothread 
AioContex(if the scsi controller
    is configure with iothread). So if there are having in-flight requests 
during unplug, a failing assertion
    happend. The bt is below:
    (gdb) bt
    #0  0x0000ffff86aacbd0 in raise () from /lib64/libc.so.6
    #1  0x0000ffff86aadf7c in abort () from /lib64/libc.so.6
    #2  0x0000ffff86aa6124 in __assert_fail_base () from /lib64/libc.so.6
    #3  0x0000ffff86aa61a4 in __assert_fail () from /lib64/libc.so.6
    #4  0x0000000000529118 in virtio_scsi_ctx_check (d=<optimized out>, 
s=<optimized out>, s=<optimized out>) at 
/home/qemu-4.0.0/hw/scsi/virtio-scsi.c:246
    #5  0x0000000000529ec4 in virtio_scsi_handle_cmd_req_prepare (s=0x2779ec00, 
req=0xffff740397d0) at /home/qemu-4.0.0/hw/scsi/virtio-scsi.c:559
    #6  0x000000000052a228 in virtio_scsi_handle_cmd_vq (s=0x2779ec00, 
vq=0xffff7c6d7110) at /home/qemu-4.0.0/hw/scsi/virtio-scsi.c:603
    #7  0x000000000052afa8 in virtio_scsi_data_plane_handle_cmd 
(vdev=<optimized out>, vq=0xffff7c6d7110) at 
/home/qemu-4.0.0/hw/scsi/virtio-scsi-dataplane.c:59
    #8  0x000000000054d94c in virtio_queue_host_notifier_aio_poll 
(opaque=<optimized out>) at /home/qemu-4.0.0/hw/virtio/virtio.c:2452
    
    assert(blk_get_aio_context(d->conf.blk) == s->ctx) failed.
    
    To avoid assertion failed,  moving the "if" after 
qdev_simple_device_unplug_cb.
    
    In addition, to avoid another qemu crash below, add aio_disable_external 
before
    qdev_simple_device_unplug_cb, which disable the further processing of 
external clients
    when doing qdev_simple_device_unplug_cb.
    (gdb) bt
    #0  scsi_req_unref (req=0xffff6802c6f0) at hw/scsi/scsi-bus.c:1283
    #1  0x00000000005294a4 in virtio_scsi_handle_cmd_req_submit (req=<optimized 
out>,
        s=<optimized out>) at /home/qemu-4.0.0/hw/scsi/virtio-scsi.c:589
    #2  0x000000000052a2a8 in virtio_scsi_handle_cmd_vq (s=s@entry=0x9c90e90,
        vq=vq@entry=0xffff7c05f110) at 
/home/qemu-4.0.0/hw/scsi/virtio-scsi.c:625
    #3  0x000000000052afd8 in virtio_scsi_data_plane_handle_cmd 
(vdev=<optimized out>,
        vq=0xffff7c05f110) at 
/home/qemu-4.0.0/hw/scsi/virtio-scsi-dataplane.c:60
    #4  0x000000000054d97c in virtio_queue_host_notifier_aio_poll 
(opaque=<optimized out>)
        at /home/qemu-4.0.0/hw/virtio/virtio.c:2447
    #5  0x00000000009b204c in run_poll_handlers_once (ctx=ctx@entry=0x6efea40,
        timeout=timeout@entry=0xffff7d7f7308) at util/aio-posix.c:521
    #6  0x00000000009b2b64 in run_poll_handlers (ctx=ctx@entry=0x6efea40,
        max_ns=max_ns@entry=4000, timeout=timeout@entry=0xffff7d7f7308) at 
util/aio-posix.c:559
    #7  0x00000000009b2ca0 in try_poll_mode (ctx=ctx@entry=0x6efea40, 
timeout=0xffff7d7f7308,
        timeout@entry=0xffff7d7f7348) at util/aio-posix.c:594
    #8  0x00000000009b31b8 in aio_poll (ctx=0x6efea40, 
blocking=blocking@entry=true)
        at util/aio-posix.c:636
    #9  0x00000000006973cc in iothread_run (opaque=0x6ebd800) at iothread.c:75
    #10 0x00000000009b592c in qemu_thread_start (args=0x6efef60) at 
util/qemu-thread-posix.c:502
    #11 0x0000ffff8057f8bc in start_thread () from /lib64/libpthread.so.0
    #12 0x0000ffff804e5f8c in thread_start () from /lib64/libc.so.6
    (gdb) p bus
    $1 = (SCSIBus *) 0x0
    
    Signed-off-by: Zhengui li <lizhengui@xxxxxxxxxx>
    Message-Id: <1563696502-7972-1-git-send-email-lizhengui@xxxxxxxxxx>
    Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
    Message-Id: <1563829520-17525-1-git-send-email-pbonzini@xxxxxxxxxx>
    Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>

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