Red Hat Bugzilla – Bug 1141667
Qemu crashed if reboot guest after hot remove AC97 sound device
Last modified: 2015-05-24 20:08:09 EDT
+++ This bug was initially created as a clone of Bug #1141666 +++ Description of problem: Qemu crashed if reboot guest after hot remove AC97 sound device I test both rhel and windows guest(windows 7 even can not drive this AC97 sound device), and both hit such issue. Version-Release number of selected component (if applicable): qemu-kvm-rhev-2.1.0-3.el7.x86_64 3.10.0-158.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1.Boot guest with AC97 sound device: # /usr/libexec/qemu-kvm -cpu Penryn -enable-kvm -m 4G -smp 4,sockets=1,cores=4,threads=1 -name test -rtc base=localtime,clock=host,driftfix=slew -k en-us -boot menu=on -spice disable-ticketing,port=5900 -vga qxl -usb -device usb-tablet -monitor stdio -drive file=/home/win7-64-sp1-virtio.qcow2,if=none,id=drive-system-disk,media=disk,format=qcow2,aio=native,werror=stop,rerror=stop -device virtio-blk-pci,drive=drive-system-disk,id=system-disk,addr=0x3 -netdev tap,vhost=on,id=hostnet0,script=/etc/qemu-ifup -device virtio-net-pci,netdev=hostnet0,id=vnet0,mac=ae:df:47:0d:87:44 -device AC97,id=a1 -qmp unix:/tmp/q1,server,nowait 2.Hot unplug the sound device {"execute":"device_del","arguments":{"id":"a1"}} {"return": {}} {"timestamp": {"seconds": 1410766965, "microseconds": 834460}, "event": "DEVICE_DELETED", "data": {"device": "a1", "path": "/machine/peripheral/a1"}} 3.Reboot guest Actual results: Qemu crashed: (gdb) #0 AUD_set_active_in (sw=0x5555563cf798, on=0) at audio/audio.c:1261 #1 0x000055555576b522 in reset_bm_regs (s=s@entry=0x55555640f940, r=r@entry=0x5555564101b4) at hw/audio/ac97.c:326 #2 0x000055555576c290 in ac97_on_reset (opaque=0x55555640f940) at hw/audio/ac97.c:1328 #3 0x00005555557223dd in qemu_devices_reset () at vl.c:1830 #4 qemu_system_reset (report=report@entry=true) at vl.c:1843 #5 0x000055555561e0df in main_loop_should_exit () at vl.c:1974 #6 main_loop () at vl.c:2014 #7 main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4552 (gdb) bt ful #0 AUD_set_active_in (sw=0x5555563cf798, on=0) at audio/audio.c:1261 nb_active = 0 s = 0x555555d1e5a0 <glob_audio_state> temp_sw = 0x74894c30468b4808 hw = 0x555555621490 <mem_add> #1 0x000055555576b522 in reset_bm_regs (s=s@entry=0x55555640f940, r=r@entry=0x5555564101b4) at hw/audio/ac97.c:326 No locals. #2 0x000055555576c290 in ac97_on_reset (opaque=0x55555640f940) at hw/audio/ac97.c:1328 s = 0x55555640f940 #3 0x00005555557223dd in qemu_devices_reset () at vl.c:1830 re = <optimized out> nre = 0x5555563fa500 #4 qemu_system_reset (report=report@entry=true) at vl.c:1843 mc = <optimized out> __func__ = "qemu_system_reset" #5 0x000055555561e0df in main_loop_should_exit () at vl.c:1974 r = <optimized out> #6 main_loop () at vl.c:2014 nonblocking = <optimized out> last_io = 1 #7 main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4552 i = <optimized out> snapshot = 0 linux_boot = 0 icount_option = 0x0 initrd_filename = 0x0 kernel_filename = 0x0 kernel_cmdline = <optimized out> boot_order = <optimized out> ds = <optimized out> cyls = 0 heads = 0 secs = 0 translation = <optimized out> ---Type <return> to continue, or q <return> to quit--- hda_opts = <optimized out> opts = <optimized out> machine_opts = <optimized out> olist = <optimized out> optind = 35 optarg = 0x7fffffffe6d8 "AC97,id=a1" loadvm = 0x0 machine_class = <optimized out> cpu_model = 0x7fffffffe4ab "Penryn" vga_model = 0x7fffffffe55e "qxl" qtest_chrdev = 0x0 qtest_log = 0x0 pid_file = 0x0 incoming = 0x0 show_vnc_port = 0 defconfig = <optimized out> userconfig = 94 log_mask = <optimized out> log_file = 0x0 mem_trace = {malloc = 0x555555720a90 <malloc_and_trace>, realloc = 0x555555720a70 <realloc_and_trace>, free = 0x555555720a60 <free_and_trace>, calloc = 0x0, try_malloc = 0x0, try_realloc = 0x0} trace_events = 0x0 trace_file = 0x0 maxram_size = 4294967296 ram_slots = 0 vmstate_dump_file = 0x0 __func__ = "main" Expected results: No crash, can reboot successfully. Additional info:
Clone bug 1141666 since qemu-kvm can hit this issue too. Component: qemu-kvm-1.5.3-70.el7.x86_64
upstream commit 133771477c39f3716d9a85609aca0d3e5a77c55c
backport posted.
Fix included in qemu-kvm-1.5.3-79.el7
Reproduce this bug with qemu-kvm-1.5.3-70.el7.x86_64 Steps 1.Boot guest with AC97 # /usr/libexec/qemu-kvm -cpu Penryn -m 4G -smp 4,sockets=1,cores=4,threads=1 -M pc -enable-kvm -device piix3-usb-uhci,id=usb -name rhel7 -nodefaults -nodefconfig -device virtio-balloon-pci,id=balloon0 -spice disable-ticketing,port=5000 -vga qxl -global PIIX4_PM.disable_s3=0 -global PIIX4_PM.disable_s4=0 -monitor stdio -drive file=/home/rhel71029/rhel711029cp1.qcow2,if=none,media=disk,format=qcow2,rerror=stop,werror=stop,aio=native,id=scsi-disk0 -device virtio-scsi-pci,id=bus2 -device scsi-hd,bus=bus2.0,drive=scsi-disk0,id=disk0 -device AC97,id=a1 -qmp unix:/tmp/q1,server,nowait 2.Hot unplug the ac97 device {"execute":"qmp_capabilities"} {"return": {}} {"execute":"device_del","arguments":{"id":"a1"}} {"return": {}} {"timestamp": {"seconds": 1415847569, "microseconds": 75933}, "event": "DEVICE_DELETED", "data": {"device": "a1", "path": "/machine/peripheral/a1"}} 3.Reboot guest Result: qemu crashed: (gdb) bt #0 AUD_set_active_out (sw=0xae00, on=0) at audio/audio.c:1194 #1 0x0000555555658872 in reset_bm_regs (s=s@entry=0x5555567484a0, r=r@entry=0x555556748b8c) at hw/audio/ac97.c:326 #2 0x00005555556595ff in ac97_on_reset (opaque=0x5555567484a0) at hw/audio/ac97.c:1331 #3 0x000055555574473d in qemu_devices_reset () at vl.c:1811 #4 qemu_system_reset (report=report@entry=true) at vl.c:1820 #5 0x0000555555604c34 in main_loop_should_exit () at vl.c:1954 #6 main_loop () at vl.c:1992 #7 main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4379 So this bug is reproduced Verify this bug with qemu-kvm-1.5.3-79.el7.x86_64 steps as above Result: after reboot, guest can work well,and ac97 is deleted successfully. Verified with both windows7 and rhel7.1 guest. So this bug is fixed
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHSA-2015-0349.html