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[qemu-s390x] [BUG?] aio_get_linux_aio: Assertion `ctx->linux_aio' failed

From: Farhan Ali
Subject: [qemu-s390x] [BUG?] aio_get_linux_aio: Assertion `ctx->linux_aio' failed
Date: Tue, 17 Jul 2018 13:25:53 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0


I am seeing some strange QEMU assertion failures for qemu on s390x,
which prevents a guest from starting.

Git bisecting points to the following commit as the source of the error.

commit ed6e2161715c527330f936d44af4c547f25f687e
Author: Nishanth Aravamudan <address@hidden>
Date:   Fri Jun 22 12:37:00 2018 -0700

    linux-aio: properly bubble up errors from initialization

    laio_init() can fail for a couple of reasons, which will lead to a NULL
    pointer dereference in laio_attach_aio_context().

    To solve this, add a aio_setup_linux_aio() function which is called
    early in raw_open_common. If this fails, propagate the error up. The
    signature of aio_get_linux_aio() was not modified, because it seems
    preferable to return the actual errno from the possible failing
    initialization calls.

    Additionally, when the AioContext changes, we need to associate a
    LinuxAioState with the new AioContext. Use the bdrv_attach_aio_context
    callback and call the new aio_setup_linux_aio(), which will allocate a
new AioContext if needed, and return errors on failures. If it fails for
    any reason, fallback to threaded AIO with an error message, as the
    device is already in-use by the guest.

    Add an assert that aio_get_linux_aio() cannot return NULL.

    Signed-off-by: Nishanth Aravamudan <address@hidden>
    Message-id: address@hidden
    Signed-off-by: Stefan Hajnoczi <address@hidden>

Not sure what is causing this assertion to fail. Here is the qemu command line of the guest, from qemu log, which throws this error:

LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin QEMU_AUDIO_DRV=none /usr/local/bin/qemu-system-s390x -name guest=rt_vm1,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-21-rt_vm1/master-key.aes -machine s390-ccw-virtio-2.12,accel=kvm,usb=off,dump-guest-core=off -m 1024 -realtime mlock=off -smp 4,sockets=4,cores=1,threads=1 -object iothread,id=iothread1 -uuid 0cde16cd-091d-41bd-9ac2-5243df5c9a0d -display none -no-user-config -nodefaults -chardev socket,id=charmonitor,fd=28,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot strict=on -drive file=/dev/mapper/360050763998b0883980000002a000031,format=raw,if=none,id=drive-virtio-disk0,cache=none,aio=native -device virtio-blk-ccw,iothread=iothread1,scsi=off,devno=fe.0.0001,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,write-cache=on -netdev tap,fd=30,id=hostnet0,vhost=on,vhostfd=31 -device virtio-net-ccw,netdev=hostnet0,id=net0,mac=02:3a:c8:67:95:84,devno=fe.0.0000 -netdev tap,fd=32,id=hostnet1,vhost=on,vhostfd=33 -device virtio-net-ccw,netdev=hostnet1,id=net1,mac=52:54:00:2a:e5:08,devno=fe.0.0002 -chardev pty,id=charconsole0 -device sclpconsole,chardev=charconsole0,id=console0 -device virtio-balloon-ccw,id=balloon0,devno=fe.3.ffba -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny -msg timestamp=on

2018-07-17 15:48:42.252+0000: Domain id=21 is tainted: high-privileges
2018-07-17T15:48:42.279380Z qemu-system-s390x: -chardev pty,id=charconsole0: char device redirected to /dev/pts/3 (label charconsole0) qemu-system-s390x: util/async.c:339: aio_get_linux_aio: Assertion `ctx->linux_aio' failed.
2018-07-17 15:48:43.309+0000: shutting down, reason=failed

Any help debugging this would be greatly appreciated.

Thank you

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