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Bug 1539537 - Guest hung after hot-unplug a disk with backend of NBD and iothread.
Summary: Guest hung after hot-unplug a disk with backend of NBD and iothread.
Keywords:
Status: CLOSED DUPLICATE of bug 1487473
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm-rhev
Version: 7.5
Hardware: All
OS: Linux
high
medium
Target Milestone: rc
: ---
Assignee: Eric Blake
QA Contact: aihua liang
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2018-01-29 07:06 UTC by Yongxue Hong
Modified: 2018-01-30 05:20 UTC (History)
14 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2018-01-30 05:20:40 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Yongxue Hong 2018-01-29 07:06:21 UTC 
Description of problem:
Guest hung after hot-unplug a disk with backend of NBD and iothread.

Version-Release number of selected component (if applicable):
host: 4.14.0-33.el7a.ppc64le
guest: 4.14.0-33.el7a.ppc64le
qemu: qemu-kvm-rhev-2.10.0-18.el7.ppc64le

How reproducible:
100%

Steps to Reproduce:
1.Boot a guest with NBD backend and iothread.
e.g:
[root@c155f3-u23 commands]# cat guest-9332.sh
/usr/libexec/qemu-kvm \
-name 'guest' \
-machine pseries-rhel7.5.0 \
-m 16G \
-nodefaults \
-smp 8,cores=4,threads=2,sockets=1 \
-boot order=cdn,once=d,menu=off,strict=off  \
-device nec-usb-xhci,id=xhci0 \
-device usb-tablet,id=usb-tablet0 \
-device usb-kbd,id=usb-kbd0 \
-chardev socket,id=qmp_id_qmpmonitor,path=/var/tmp/qmp-cmd-monitor-yhong,server,nowait \
-mon chardev=qmp_id_qmpmonitor,mode=control  \
-chardev socket,id=serial_id_serial,path=/var/tmp/serial-yhong,server,nowait \
-device spapr-vty,reg=0x30000000,chardev=serial_id_serial \
-enable-kvm \
-object iothread,id=iothread0 \
-object iothread,id=iothread1 \
-device virtio-scsi-pci,id=scsi0,iothread=iothread0 \
-device virtio-scsi-pci,id=scsi1,iothread=iothread1 \
-device virtio-scsi-pci,id=scsi2 \
-drive file=nbd:10.0.1.8:10086,format=qcow2,aio=native,if=none,cache=none,media=disk,werror=stop,rerror=stop,id=drive_system \
-device scsi-hd,bus=scsi0.0,drive=drive_system,id=system,bootindex=0 \
-drive file=nbd:10.0.1.8:20001,format=qcow2,aio=native,if=none,cache=none,media=disk,werror=stop,rerror=stop,id=drive_data1 \
-device scsi-hd,bus=scsi1.0,drive=drive_data1,id=data1 \
-drive file=nbd:10.0.1.8:20002,format=qcow2,aio=native,if=none,cache=none,media=disk,werror=stop,rerror=stop,id=drive_data2 \
-device scsi-hd,bus=scsi2.0,drive=drive_data2,id=data2 \
-netdev tap,id=hostnet0,script=/etc/qemu-ifup \
-device virtio-net-pci,netdev=hostnet0,id=virtio-net-pci0,mac=40:f2:e9:5d:9c:03 \
-monitor stdio \

2.Hot-unplug the drive_data1.
e.g:
[root@c155f3-u23 ~]# nc -U /var/tmp/qmp-cmd-monitor-yhong 
{"QMP": {"version": {"qemu": {"micro": 0, "minor": 10, "major": 2}, "package": "(qemu-kvm-rhev-2.10.0-18.el7)"}, "capabilities": []}}
{'execute':'qmp_capabilities'}
{"return": {}}
{'execute':'device_del','arguments':{'id':'scsi1'}}
{"return": {}}

[root@localhost ~]# [   45.273116] sd 1:0:0:0: [sdb] Synchronizing SCSI cache
[   45.358264] iommu: Removing device 0000:00:02.0 from group 0

Actual results:
Guest hung.

Expected results:
Guest run normally.

Additional info:
Hot-unplug the drive_data2 without iothread successfully.
{'execute':'device_del','arguments':{'id':'scsi2'}}
{"return": {}}
{"timestamp": {"seconds": 1517140053, "microseconds": 984937}, "event": "DEVICE_DELETED", "data": {"device": "data2", "path": "/machine/peripheral/data2"}}
{"timestamp": {"seconds": 1517140053, "microseconds": 985022}, "event": "DEVICE_DELETED", "data": {"path": "/machine/peripheral/scsi2/virtio-backend"}}
{"timestamp": {"seconds": 1517140053, "microseconds": 993100}, "event": "DEVICE_DELETED", "data": {"device": "scsi2", "path": "/machine/peripheral/scsi2"}}
Guest run normally.
Comment 1 Yongxue Hong 2018-01-29 07:09:48 UTC 
The operation of NBD server:
qemu-img create -f qcow2 -o preallocation=falloc rhel-alt-75-ppc64le-virtio-scsi-30G.qcow2 30G
qemu-nbd -f raw  rhel-alt-75-ppc64le-virtio-scsi-30G.qcow2 -p 10086 -t -e 10 &
for i in `seq 0 10`; do qemu-img create -f qcow2 -o preallocation=falloc disk-test$i.5G.qcow2 5G; done
for i in `seq 0 10`; do qemu-nbd -f raw  disk-test$i.5G.qcow2  -p 2000$i -t -e 10 & done
Comment 2 Qunfang Zhang 2018-01-29 07:18:12 UTC 
Yongxue,

Does this bug also happen on Power8 and x86? 

Is this a regression? 

Thanks,
Qunfang
Comment 3 Yongxue Hong 2018-01-29 08:38:39 UTC 
It is also reproduced on x86_64.

[root@ibm-x3850x5-07 yhong]# cat guest.sh 
/usr/libexec/qemu-kvm \
    -name 'avocado-vt-vm1'  \
    -sandbox off  \
    -machine pc  \
    -nodefaults  \
    -vga cirrus  \
    -object iothread,id=iothread0 \
    -object iothread,id=iothread1 \
    -device virtio-scsi-pci,id=scsi0,iothread=iothread0 \
    -device virtio-scsi-pci,id=scsi1,iothread=iothread1 \
    -device virtio-scsi-pci,id=scsi2 \
    -chardev socket,id=qmp_id_qmpmonitor1,path=/var/tmp/monitor-qmpmonitor1,server,nowait \
    -mon chardev=qmp_id_qmpmonitor1,mode=control  \
    -device pvpanic,ioport=0x505,id=iduHVO78  \
    -chardev socket,id=serial_id_serial0,path=/var/tmp/serial-serial0,server,nowait \
    -device isa-serial,chardev=serial_id_serial0  \
    -chardev socket,id=seabioslog_id_20180129-013808-Mj5o0JZF,path=/var/tmp/seabios,server,nowait \
    -device isa-debugcon,chardev=seabioslog_id_20180129-013808-Mj5o0JZF,iobase=0x402 \
    -drive file=nbd:10.66.9.109:10086,format=qcow2,aio=native,if=none,cache=none,media=disk,werror=stop,rerror=stop,id=drive_system \
    -device scsi-hd,bus=scsi0.0,drive=drive_system,id=system,bootindex=0 \
    -drive file=nbd:10.66.9.109:20001,format=qcow2,aio=native,if=none,cache=none,media=disk,werror=stop,rerror=stop,id=drive_data1 \
    -device scsi-hd,bus=scsi1.0,drive=drive_data1,id=data1 \
    -drive file=nbd:10.66.9.109:20002,format=qcow2,aio=native,if=none,cache=none,media=disk,werror=stop,rerror=stop,id=drive_data2 \
    -device scsi-hd,bus=scsi2.0,drive=drive_data2,id=data2 \
    -device virtio-net-pci,mac=9a:1a:1b:1c:1d:1e,id=idHuzuRL,vectors=4,netdev=idYunEv6,bus=pci.0  \
    -netdev tap,id=idYunEv6,vhost=on \
    -device ich9-usb-ehci1,id=usb1,addr=0x1d.7,multifunction=on,bus=pci.0 \
    -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1  \
    -m 8192  \
    -smp 16,maxcpus=16,cores=8,threads=1,sockets=2  \
    -vnc :0  \
    -rtc base=utc,clock=host,driftfix=slew  \
    -boot menu=off,strict=off,order=cdn,once=d  \
    -enable-kvm \
    -monitor stdio

[root@ibm-x3850x5-07 ~]# nc -U /var/tmp/monitor-qmpmonitor1
{"QMP": {"version": {"qemu": {"micro": 0, "minor": 10, "major": 2}, "package": "(qemu-kvm-rhev-2.10.0-18.el7)"}, "capabilities": []}}
{'execute':'qmp_capabilities'}
{"return": {}}
{'execute':'device_del','arguments':{'id':'scsi1'}}
{"return": {}}

Guest hung.

host : 3.10.0-837.el7.x86_64
guest : 3.10.0-837.el7.x86_64
qemu : qemu-kvm-rhev-2.10.0-18.el7.x86_64
Comment 4 Yongxue Hong 2018-01-29 09:03:43 UTC 
GDB TRACE ：

(gdb) bt
#0  0x00007fb8cb9d04cd in __lll_lock_wait () at /lib64/libpthread.so.0
#1  0x00007fb8cb9cbdcb in _L_lock_812 () at /lib64/libpthread.so.0
#2  0x00007fb8cb9cbc98 in pthread_mutex_lock () at /lib64/libpthread.so.0
#3  0x00005604f78e0f8f in qemu_mutex_lock (mutex=mutex@entry=0x5604f7ea6ac0 <qemu_global_mutex>)
    at util/qemu-thread-posix.c:65
#4  0x00005604f75f89dc in qemu_mutex_lock_iothread () at /usr/src/debug/qemu-2.10.0/cpus.c:1581
#5  0x00005604f78de54f in main_loop_wait (timeout=2728533885) at util/main-loop.c:258
#6  0x00005604f78de54f in main_loop_wait (nonblocking=nonblocking@entry=0) at util/main-loop.c:515
#7  0x00005604f75be8da in main () at vl.c:1937
#8  0x00005604f75be8da in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>)
    at vl.c:4828
(gdb)  bt full
#0  0x00007fb8cb9d04cd in __lll_lock_wait () at /lib64/libpthread.so.0
#1  0x00007fb8cb9cbdcb in _L_lock_812 () at /lib64/libpthread.so.0
#2  0x00007fb8cb9cbc98 in pthread_mutex_lock () at /lib64/libpthread.so.0
#3  0x00005604f78e0f8f in qemu_mutex_lock (mutex=mutex@entry=0x5604f7ea6ac0 <qemu_global_mutex>)
    at util/qemu-thread-posix.c:65
        err = <optimized out>
        __PRETTY_FUNCTION__ = "qemu_mutex_lock"
        __func__ = "qemu_mutex_lock"
#4  0x00005604f75f89dc in qemu_mutex_lock_iothread () at /usr/src/debug/qemu-2.10.0/cpus.c:1581
#5  0x00005604f78de54f in main_loop_wait (timeout=2728533885) at util/main-loop.c:258
        context = 0x5604f9228a50
        ret = 1
        spin_counter = 0
        ret = 1
        timeout = 4294967295
        timeout_ns = <optimized out>
#6  0x00005604f78de54f in main_loop_wait (nonblocking=nonblocking@entry=0) at util/main-loop.c:515
        ret = 1
        timeout = 4294967295
        timeout_ns = <optimized out>
#7  0x00005604f75be8da in main () at vl.c:1937
        i = <optimized out>
        snapshot = <optimized out>
---Type <return> to continue, or q <return> to quit---
        linux_boot = <optimized out>
        initrd_filename = <optimized out>
        kernel_filename = <optimized out>
        kernel_cmdline = <optimized out>
        boot_order = <optimized out>
        boot_once = 0x5604f9194aa8 "d"
        cyls = <optimized out>
        heads = <optimized out>
        secs = <optimized out>
        translation = <optimized out>
        opts = <optimized out>
        machine_opts = <optimized out>
        hda_opts = <optimized out>
        icount_opts = <optimized out>
        accel_opts = <optimized out>
        olist = <optimized out>
        optind = 67
        optarg = 0x7ffde9aa94d5 "stdio"
        loadvm = <optimized out>
        machine_class = 0x0
        cpu_model = <optimized out>
        vga_model = 0x7ffde9aa8e62 "cirrus"
        qtest_chrdev = <optimized out>
---Type <return> to continue, or q <return> to quit---
        qtest_log = <optimized out>
        pid_file = <optimized out>
        incoming = <optimized out>
        defconfig = <optimized out>
        userconfig = <optimized out>
        nographic = <optimized out>
        display_type = <optimized out>
        display_remote = <optimized out>
        log_mask = <optimized out>
        log_file = <optimized out>
        trace_file = <optimized out>
        maxram_size = <optimized out>
        ram_slots = <optimized out>
        vmstate_dump_file = <optimized out>
        main_loop_err = 0x0
        err = 0x0
        list_data_dirs = <optimized out>
        bdo_queue = {sqh_first = 0x0, sqh_last = 0x7ffde9aa6980}
        __func__ = "main"
        __FUNCTION__ = "main"
#8  0x00005604f75be8da in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>)
    at vl.c:4828
        i = <optimized out>
---Type <return> to continue, or q <return> to quit---
        snapshot = <optimized out>
        linux_boot = <optimized out>
        initrd_filename = <optimized out>
        kernel_filename = <optimized out>
        kernel_cmdline = <optimized out>
        boot_order = <optimized out>
        boot_once = 0x5604f9194aa8 "d"
        cyls = <optimized out>
        heads = <optimized out>
        secs = <optimized out>
        translation = <optimized out>
        opts = <optimized out>
        machine_opts = <optimized out>
        hda_opts = <optimized out>
        icount_opts = <optimized out>
        accel_opts = <optimized out>
        olist = <optimized out>
        optind = 67
        optarg = 0x7ffde9aa94d5 "stdio"
        loadvm = <optimized out>
        machine_class = 0x0
        cpu_model = <optimized out>
        vga_model = 0x7ffde9aa8e62 "cirrus"
---Type <return> to continue, or q <return> to quit---
        qtest_chrdev = <optimized out>
        qtest_log = <optimized out>
        pid_file = <optimized out>
        incoming = <optimized out>
        defconfig = <optimized out>
        userconfig = <optimized out>
        nographic = <optimized out>
        display_type = <optimized out>
        display_remote = <optimized out>
        log_mask = <optimized out>
        log_file = <optimized out>
        trace_file = <optimized out>
        maxram_size = <optimized out>
        ram_slots = <optimized out>
        vmstate_dump_file = <optimized out>
        main_loop_err = 0x0
        err = 0x0
        list_data_dirs = <optimized out>
        bdo_queue = {sqh_first = 0x0, sqh_last = 0x7ffde9aa6980}
        __func__ = "main"
        __FUNCTION__ = "main"
Comment 6 CongLi 2018-01-30 05:20:40 UTC 

*** This bug has been marked as a duplicate of bug 1487473 ***
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