On 2012-06-27 17:39, Peter Lieven wrote: > Hi all, > > i debugged this further and found out that kvm-kmod-3.0 is working with > qemu-kvm-1.0.1 while kvm-kmod-3.3 and kvm-kmod-3.4 are not. What is > working as well is kvm-kmod-3.4 with an old userspace (qemu-kvm-0.13.0). > Has anyone a clue which new KVM feature could cause this if a vcpu is in > an infinite loop? Before accusing kvm-kmod ;), can you check if the effect is visible with an original Linux 3.3.x or 3.4.x kernel as well? Then, bisection the change in qemu-kvm that apparently resolved the issue would be interesting. If we have to dig deeper, tracing [1] the lockup would likely be helpful (all events of the qemu process, not just KVM related ones: trace-cmd record -e all qemu-system-x86_64 ...). Jan [1] http://www.linux-kvm.org/page/Tracing > --- > > Hi, > > we recently came across multiple VMs racing and stopping working. It > seems to happen when the system is at 100% cpu. > One way to reproduce this is: > qemu-kvm-1.0.1 with vnc-thread enabled > > cmdline (or similar): > /usr/bin/qemu-kvm-1.0.1 -net > tap,vlan=141,script=no,downscript=no,ifname=tap15,vnet_hdr -net > nic,vlan=141,model=virtio,macaddr=52:54:00:ff:00:f7 -drive > format=host_device,file=/dev/mapper/iqn.2001-05.com.equallogic:0-8a0906-efdf4e007-16700198c7f4fead-02-debug-race-hd01,if=virtio,cache=none,aio=native > -m 2048 -smp 2,sockets=1,cores=2,threads=1 -monitor > tcp:0:4026,server,nowait -vnc :26 -qmp tcp:0:3026,server,nowait -name > 02-debug-race -boot order=dc,menu=off -cdrom > /home/kvm/cdrom//root/ubuntu-12.04-server-amd64.iso -k de -pidfile > /var/run/qemu/vm-221.pid -mem-prealloc -cpu > host,+x2apic,model_id=Intel(R) Xeon(R) CPU L5640 @ > 2.27GHz,-tsc -rtc base=utc -usb -usbdevice tablet -no-hpet -vga cirrus > > it is important that the attached virtio image contains only zeroes. if > the system boots from cd, select boot from first harddisk. > the hypervisor then hangs at 100% cpu and neither monitor nor qmp are > responsive anymore. > > i have also seen customers reporting this when a VM is shut down. > > if this is connected to the threaded vnc server it might be important to > connected at this time. > > debug backtrace attached. > > Thanks, > Peter > > -- > > (gdb) file /usr/bin/qemu-kvm-1.0.1 > Reading symbols from /usr/bin/qemu-kvm-1.0.1...done. > (gdb) attach 5145 > Attaching to program: /usr/bin/qemu-kvm-1.0.1, process 5145 > Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols > found)...done. > Loaded symbols for /lib64/ld-linux-x86-64.so.2 > [Thread debugging using libthread_db enabled] > [New Thread 0x7f54d08b9700 (LWP 5253)] > [New Thread 0x7f5552757700 (LWP 5152)] > [New Thread 0x7f5552f58700 (LWP 5151)] > 0x00007f5553c6b5a3 in select () from /lib/libc.so.6 > (gdb) info threads > 4 Thread 0x7f5552f58700 (LWP 5151) 0x00007f5553c6a747 in ioctl () > from /lib/libc.so.6 > 3 Thread 0x7f5552757700 (LWP 5152) 0x00007f5553c6a747 in ioctl () > from /lib/libc.so.6 > 2 Thread 0x7f54d08b9700 (LWP 5253) 0x00007f5553f1a85c in > pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0 > * 1 Thread 0x7f555550d700 (LWP 5145) 0x00007f5553c6b5a3 in select () > from /lib/libc.so.6 > (gdb) thread apply all bt > > Thread 4 (Thread 0x7f5552f58700 (LWP 5151)): > #0 0x00007f5553c6a747 in ioctl () from /lib/libc.so.6 > #1 0x00007f5555727830 in kvm_vcpu_ioctl (env=0x7f5557652f10, > type=44672) at /usr/src/qemu-kvm-1.0.1/kvm-all.c:1101 > #2 0x00007f555572728a in kvm_cpu_exec (env=0x7f5557652f10) at > /usr/src/qemu-kvm-1.0.1/kvm-all.c:987 > #3 0x00007f55556f5c08 in qemu_kvm_cpu_thread_fn (arg=0x7f5557652f10) at > /usr/src/qemu-kvm-1.0.1/cpus.c:740 > #4 0x00007f5553f159ca in start_thread () from /lib/libpthread.so.0 > #5 0x00007f5553c72cdd in clone () from /lib/libc.so.6 > #6 0x0000000000000000 in ?? () > > Thread 3 (Thread 0x7f5552757700 (LWP 5152)): > #0 0x00007f5553c6a747 in ioctl () from /lib/libc.so.6 > #1 0x00007f5555727830 in kvm_vcpu_ioctl (env=0x7f555766ae60, > type=44672) at /usr/src/qemu-kvm-1.0.1/kvm-all.c:1101 > #2 0x00007f555572728a in kvm_cpu_exec (env=0x7f555766ae60) at > /usr/src/qemu-kvm-1.0.1/kvm-all.c:987 > #3 0x00007f55556f5c08 in qemu_kvm_cpu_thread_fn (arg=0x7f555766ae60) at > /usr/src/qemu-kvm-1.0.1/cpus.c:740 > #4 0x00007f5553f159ca in start_thread () from /lib/libpthread.so.0 > #5 0x00007f5553c72cdd in clone () from /lib/libc.so.6 > #6 0x0000000000000000 in ?? () > > Thread 2 (Thread 0x7f54d08b9700 (LWP 5253)): > #0 0x00007f5553f1a85c in pthread_cond_wait@@GLIBC_2.3.2 () from > /lib/libpthread.so.0 > #1 0x00007f5555679f5d in qemu_cond_wait (cond=0x7f5557ede1e0, > mutex=0x7f5557ede210) at qemu-thread-posix.c:113 > #2 0x00007f55556b06a1 in vnc_worker_thread_loop (queue=0x7f5557ede1e0) > at ui/vnc-jobs-async.c:222 > #3 0x00007f55556b0b7f in vnc_worker_thread (arg=0x7f5557ede1e0) at > ui/vnc-jobs-async.c:318 > #4 0x00007f5553f159ca in start_thread () from /lib/libpthread.so.0 > #5 0x00007f5553c72cdd in clone () from /lib/libc.so.6 > #6 0x0000000000000000 in ?? () > > Thread 1 (Thread 0x7f555550d700 (LWP 5145)): > #0 0x00007f5553c6b5a3 in select () from /lib/libc.so.6 > #1 0x00007f55556516be in main_loop_wait (nonblocking=0) at main-loop.c:456 > #2 0x00007f5555647ad0 in main_loop () at /usr/src/qemu-kvm-1.0.1/vl.c:1482 > #3 0x00007f555564c698 in main (argc=38, argv=0x7ffff9d894a8, > envp=0x7ffff9d895e0) at /usr/src/qemu-kvm-1.0.1/vl.c:3523 > (gdb) thread apply all bt full > > Thread 4 (Thread 0x7f5552f58700 (LWP 5151)): > #0 0x00007f5553c6a747 in ioctl () from /lib/libc.so.6 > No symbol table info available. > #1 0x00007f5555727830 in kvm_vcpu_ioctl (env=0x7f5557652f10, > type=44672) at /usr/src/qemu-kvm-1.0.1/kvm-all.c:1101 > ret = 32597 > arg = 0x0 > ap = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = > 0x7f5552f57e50, reg_save_area = 0x7f5552f57d90}} > #2 0x00007f555572728a in kvm_cpu_exec (env=0x7f5557652f10) at > /usr/src/qemu-kvm-1.0.1/kvm-all.c:987 > run = 0x7f55553e2000 > ret = 0 > run_ret = 0 > #3 0x00007f55556f5c08 in qemu_kvm_cpu_thread_fn (arg=0x7f5557652f10) at > /usr/src/qemu-kvm-1.0.1/cpus.c:740 > env = 0x7f5557652f10 > r = 0 > #4 0x00007f5553f159ca in start_thread () from /lib/libpthread.so.0 > No symbol table info available. > #5 0x00007f5553c72cdd in clone () from /lib/libc.so.6 > No symbol table info available. > #6 0x0000000000000000 in ?? () > No symbol table info available. > > Thread 3 (Thread 0x7f5552757700 (LWP 5152)): > #0 0x00007f5553c6a747 in ioctl () from /lib/libc.so.6 > No symbol table info available. > #1 0x00007f5555727830 in kvm_vcpu_ioctl (env=0x7f555766ae60, > type=44672) at /usr/src/qemu-kvm-1.0.1/kvm-all.c:1101 > ret = 0 > arg = 0x0 > ap = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = > 0x7f5552756e50, reg_save_area = 0x7f5552756d90}} > #2 0x00007f555572728a in kvm_cpu_exec (env=0x7f555766ae60) at > /usr/src/qemu-kvm-1.0.1/kvm-all.c:987 > run = 0x7f55553df000 > ret = 32597 > run_ret = 1433358864 > #3 0x00007f55556f5c08 in qemu_kvm_cpu_thread_fn (arg=0x7f555766ae60) at > /usr/src/qemu-kvm-1.0.1/cpus.c:740 > env = 0x7f555766ae60 > r = 65536 > #4 0x00007f5553f159ca in start_thread () from /lib/libpthread.so.0 > No symbol table info available. > #5 0x00007f5553c72cdd in clone () from /lib/libc.so.6 > No symbol table info available. > #6 0x0000000000000000 in ?? () > No symbol table info available. > > Thread 2 (Thread 0x7f54d08b9700 (LWP 5253)): > #0 0x00007f5553f1a85c in pthread_cond_wait@@GLIBC_2.3.2 () from > /lib/libpthread.so.0 > ---Type <return> to continue, or q <return> to quit--- > No symbol table info available. > #1 0x00007f5555679f5d in qemu_cond_wait (cond=0x7f5557ede1e0, > mutex=0x7f5557ede210) at qemu-thread-posix.c:113 > err = 32597 > __func__ = "qemu_cond_wait" > #2 0x00007f55556b06a1 in vnc_worker_thread_loop (queue=0x7f5557ede1e0) > at ui/vnc-jobs-async.c:222 > job = 0x7f5557edd510 > entry = 0x0 > tmp = 0x0 > vs = {csock = -1, ds = 0x7f5557e8ec40, dirty = {{0, 0, 0} > <repeats 2048 times>}, lossy_rect = 0x7f5557edd570, vd = 0x7f54d08ba010, > need_update = 0, force_update = 0, > features = 227, absolute = 0, last_x = 0, last_y = 0, > client_width = 0, client_height = 0, vnc_encoding = 6, major = 0, minor > = 0, auth = 0, > challenge = '\000' <repeats 15 times>, info = 0x0, output = > {capacity = 1230913, offset = 1448, buffer = 0x7f5558176d60 ""}, input = > {capacity = 0, offset = 0, > buffer = 0x0}, write_pixels = 0x7f55556b2aaf > <vnc_write_pixels_generic>, clientds = {flags = 0 '\000', width = 640, > height = 480, linesize = 1280, > data = 0x7f54d0c00000 "B\a", pf = {bits_per_pixel = 32 ' ', > bytes_per_pixel = 4 '\004', depth = 24 '\030', rmask = 16711680, gmask = > 65280, bmask = 255, amask = 0, > rshift = 16 '\020', gshift = 8 '\b', bshift = 0 '\000', > ashift = 0 '\000', rmax = 255 '\377', gmax = 255 '\377', bmax = 255 > '\377', amax = 0 '\000', > rbits = 8 '\b', gbits = 8 '\b', bbits = 8 '\b', abits = 0 > '\000'}}, audio_cap = 0x0, as = {freq = 0, nchannels = 0, fmt = > AUD_FMT_U8, endianness = 0}, > read_handler = 0, read_handler_expect = 0, modifiers_state = > '\000' <repeats 255 times>, led = 0x0, abort = false, output_mutex = > {lock = {__data = {__lock = 0, > __count = 0, __owner = 0, __nusers = 0, __kind = 0, > __spins = 0, __list = {__prev = 0x0, __next = 0x0}}, __size = '\000' > <repeats 39 times>, __align = 0}}, > bh = 0x0, jobs_buffer = {capacity = 0, offset = 0, buffer = > 0x0}, tight = {type = 0, quality = 255 '\377', compression = 9 '\t', > pixel24 = 0 '\000', tight = { > capacity = 0, offset = 0, buffer = 0x0}, tmp = {capacity = > 0, offset = 0, buffer = 0x0}, zlib = {capacity = 0, offset = 0, buffer = > 0x0}, gradient = { > capacity = 0, offset = 0, buffer = 0x0}, levels = {0, 0, > 0, 0}, stream = {{next_in = 0x0, avail_in = 0, total_in = 0, next_out = > 0x0, avail_out = 0, > total_out = 0, msg = 0x0, state = 0x0, zalloc = 0, zfree > = 0, opaque = 0x0, data_type = 0, adler = 0, reserved = 0}, {next_in = > 0x0, avail_in = 0, total_in = 0, > next_out = 0x0, avail_out = 0, total_out = 0, msg = 0x0, > state = 0x0, zalloc = 0, zfree = 0, opaque = 0x0, data_type = 0, adler = > 0, reserved = 0}, { > next_in = 0x0, avail_in = 0, total_in = 0, next_out = > 0x0, avail_out = 0, total_out = 0, msg = 0x0, state = 0x0, zalloc = 0, > zfree = 0, opaque = 0x0, > data_type = 0, adler = 0, reserved = 0}, {next_in = 0x0, > avail_in = 0, total_in = 0, next_out = 0x0, avail_out = 0, total_out = > 0, msg = 0x0, state = 0x0, > zalloc = 0, zfree = 0, opaque = 0x0, data_type = 0, > adler = 0, reserved = 0}}}, zlib = {zlib = {capacity = 1229488, offset = > 1152000, > buffer = 0x7f5557fe9320 ""}, tmp = {capacity = 1230913, > offset = 20, buffer = 0x7f5558176d60 ""}, stream = {next_in = > 0x7f5558102720 "\030\b ", avail_in = 0, > total_in = 7658880, next_out = 0x7f5558177308 "", > avail_out = 1229465, total_out = 49027, msg = 0x0, state = 0x7f55581155e0, > zalloc = 0x7f55556a622f <vnc_zlib_zalloc>, zfree = > 0x7f55556a626c <vnc_zlib_zfree>, opaque = 0x7f54d08a6810, data_type = 0, > adler = 197164569, reserved = 0}, > level = 9}, hextile = {send_tile = 0x7f55556a1180 > <send_hextile_tile_generic_32>}, zrle = {type = 0, fb = {capacity = 0, > offset = 0, buffer = 0x0}, zrle = { > capacity = 0, offset = 0, buffer = 0x0}, tmp = {capacity = > 0, offset = 0, buffer = 0x0}, zlib = {capacity = 0, offset = 0, buffer = > 0x0}, stream = {next_in = 0x0, > avail_in = 0, total_in = 0, next_out = 0x0, avail_out = 0, > total_out = 0, msg = 0x0, state = 0x0, zalloc = 0, zfree = 0, opaque = > 0x0, data_type = 0, adler = 0, > reserved = 0}, palette = {pool = {{idx = 0, color = 0, > next = {le_next = 0x0, le_prev = 0x0}} <repeats 256 times>}, size = 0, > max = 0, bpp = 0, table = {{ > lh_first = 0x0} <repeats 256 times>}}}, zywrle = {buf > = {0 <repeats 4096 times>}}, mouse_mode_notifier = {notify = 0, node = > {tqe_next = 0x0, > tqe_prev = 0x0}}, next = {tqe_next = 0x0, tqe_prev = 0x0}} > n_rectangles = 1 > saved_offset = 2 > #3 0x00007f55556b0b7f in vnc_worker_thread (arg=0x7f5557ede1e0) at > ui/vnc-jobs-async.c:318 > queue = 0x7f5557ede1e0 > #4 0x00007f5553f159ca in start_thread () from /lib/libpthread.so.0 > No symbol table info available. > #5 0x00007f5553c72cdd in clone () from /lib/libc.so.6 > No symbol table info available. > #6 0x0000000000000000 in ?? () > No symbol table info available. > > ---Type <return> to continue, or q <return> to quit--- > Thread 1 (Thread 0x7f555550d700 (LWP 5145)): > #0 0x00007f5553c6b5a3 in select () from /lib/libc.so.6 > No symbol table info available. > #1 0x00007f55556516be in main_loop_wait (nonblocking=0) at main-loop.c:456 > rfds = {fds_bits = {14197552, 0 <repeats 15 times>}} > wfds = {fds_bits = {0 <repeats 16 times>}} > xfds = {fds_bits = {0 <repeats 16 times>}} > ret = 32597 > nfds = 23 > tv = {tv_sec = 0, tv_usec = 817147} > timeout = 1000 > #2 0x00007f5555647ad0 in main_loop () at /usr/src/qemu-kvm-1.0.1/vl.c:1482 > nonblocking = false > last_io = 1 > #3 0x00007f555564c698 in main (argc=38, argv=0x7ffff9d894a8, > envp=0x7ffff9d895e0) at /usr/src/qemu-kvm-1.0.1/vl.c:3523 > gdbstub_dev = 0x0 > i = 64 > snapshot = 0 > linux_boot = 0 > icount_option = 0x0 > initrd_filename = 0x0 > kernel_filename = 0x0 > kernel_cmdline = 0x7f55557d8bef "" > boot_devices = "dc", '\000' <repeats 30 times> > ds = 0x7f5557e8ec40 > dcl = 0x0 > cyls = 0 > heads = 0 > secs = 0 > translation = 0 > hda_opts = 0x0 > opts = 0x7f5557637cb0 > olist = 0x7ffff9d89268 > optind = 38 > optarg = 0x7ffff9d89bed "cirrus" > loadvm = 0x0 > machine = 0x7f5555b53500 > cpu_model = 0x7ffff9d89b6f "host,+x2apic,model_id=Intel(R) > Xeon(R) CPU", ' ' <repeats 11 times>, "L5640 @ 2.27GHz,-tsc" > pid_file = 0x7ffff9d89b43 "/var/run/qemu/vm-221.pid" > incoming = 0x0 > show_vnc_port = 0 > defconfig = 1 > log_mask = 0x0 > log_file = 0x0 > mem_trace = {malloc = 0x7f5555649081 <malloc_and_trace>, realloc > = 0x7f55556490b6 <realloc_and_trace>, free = 0x7f55556490fa > <free_and_trace>, calloc = 0, > ---Type <return> to continue, or q <return> to quit--- > try_malloc = 0, try_realloc = 0} > trace_events = 0x0 > trace_file = 0x0 > (gdb) > > >
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