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High rate of MMIO causes KVM stall

From: Geoffrey McRae
Subject: High rate of MMIO causes KVM stall
Date: Mon, 27 Jan 2020 00:25:35 +1100
User-agent: Roundcube Webmail/1.3.8 
Hi All,
I have run into what appears to be a race condition in Qemu with regards to iommu access involving atomic reads performed by a userspace application in the guest 
virtual machine with a VFIO passthrough GPU.
While polling a memory mapped IO address on the ivshmem device at a high rate, graphical updates such as simple click and drag to select multiple icons on the 
Windows desktop can randomly trigger a stall lasting several seconds.
Below is a trace I obtained from attaching a debugger and breaking during one of 
these events. As can be seen multiple threads are waiting on the
qemu_global_mutex while trying to perform a MMIO read.
What is more concerning then the poor guest operation is that during this stall the host system and all other guests on the system becomes very slow/unresponsive until the guest manages to resume itself. This might be possible to be used as a form of DoS attack on the host system if the exact usage pattern can be narrowed 
down.

The VM's is configured as follows:
-machine q35,accel=kvm,usb=off,vmport=off,dump-guest-core=off,kernel-irqchip=on \ -cpu host,hv_time,hv_vpindex,hv_reset,hv_runtime,hv_crash,hv_synic,hv_stimer,hv_spinlocks=0x1fff,hv_vendor_id=lakeuv283713,kvm=off,l3-cache=on,-hypervisor,migratable=no,+invtsc,topoext 

If further details are required please advise.

Kind Regards,
Geoffrey McRae
HostFission
https://hostfission.com

== TRACE ==

Thread 12 (Thread 0x7f3ceb5fe700 (LWP 77094)):
#0 0x00007f3d12b91819 in __GI___poll (fds=0x7f38ac000b20, nfds=2, timeout=1490) at ../sysdeps/unix/sysv/linux/poll.c:29 
#1  0x00007f3d142e2131 in  () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#2 0x00007f3d142d39a0 in pa_mainloop_poll () at /usr/lib/x86_64-linux-gnu/libpulse.so.0 #3 0x00007f3d142d3fee in pa_mainloop_iterate () at /usr/lib/x86_64-linux-gnu/libpulse.so.0 #4 0x00007f3d142d40a0 in pa_mainloop_run () at /usr/lib/x86_64-linux-gnu/libpulse.so.0 
#5  0x00007f3d142e2079 in  () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#6 0x00007f3d124bc468 in () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-12.2.so #7 0x00007f3d12c6bfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486 #8 0x00007f3d12b9c4cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 

Thread 11 (Thread 0x7f3cebdff700 (LWP 77091)):
#0 0x00007f3d12c763c7 in __libc_recvmsg (flags=0, msg=0x7f3cebdfbb80, fd=41) at ../sysdeps/unix/sysv/linux/recvmsg.c:28 #1 0x00007f3d12c763c7 in __libc_recvmsg (fd=41, msg=0x7f3cebdfbb80, flags=0) at ../sysdeps/unix/sysv/linux/recvmsg.c:25 #2 0x00007f3d12497fd7 in pa_iochannel_read_with_ancil_data () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-12.2.so #3 0x00007f3d124a8867 in () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-12.2.so #4 0x00007f3d124ab7ff in () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-12.2.so #5 0x00007f3d142d3d28 in pa_mainloop_dispatch () at /usr/lib/x86_64-linux-gnu/libpulse.so.0 #6 0x00007f3d142d3ffc in pa_mainloop_iterate () at /usr/lib/x86_64-linux-gnu/libpulse.so.0 #7 0x00007f3d142d40a0 in pa_mainloop_run () at /usr/lib/x86_64-linux-gnu/libpulse.so.0 
#8  0x00007f3d142e2079 in  () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#9 0x00007f3d124bc468 in () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-12.2.so #10 0x00007f3d12c6bfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486 #11 0x00007f3d12b9c4cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 

Thread 10 (Thread 0x7f3cf97fa700 (LWP 77088)):
#0 0x00007f3d12c7529c in __lll_lock_wait () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:103 #1 0x00007f3d12c6e714 in __GI___pthread_mutex_lock (mutex=mutex@entry=0x5564ce5bc740 <qemu_global_mutex>) at ../nptl/pthread_mutex_lock.c:80 #2 0x00005564cde59023 in qemu_mutex_lock_impl (mutex=0x5564ce5bc740 <qemu_global_mutex>, file=0x5564cdf1d004 "/srv/QEMU/Source/exec.c", line=3129) 
    at /srv/QEMU/Source/util/qemu-thread-posix.c:78
#3 0x00005564cd96c27e in qemu_mutex_lock_iothread_impl (file=file@entry=0x5564cdf1d004 "/srv/QEMU/Source/exec.c", line=line@entry=3129) 
    at /srv/QEMU/Source/cpus.c:1899
#4 0x00005564cd90d155 in prepare_mmio_access (mr=0x5564cf271f10, mr=0x5564cf271f10) at /srv/QEMU/Source/exec.c:3129 
#5  0x00005564cd90d155 in flatview_read_continue
(fv=0x7f3ce0649880, addr=1544, attrs=..., buf=0x7f3d02f1e000 "", len=4, addr1=<optimized out>, l=<optimized out>, mr=0x5564cf271f10) 
    at /srv/QEMU/Source/exec.c:3225
#6 0x00005564cd90d30d in flatview_read (fv=0x7f3ce0649880, addr=1544, attrs=..., buf=0x7f3d02f1e000 "", len=4) at /srv/QEMU/Source/exec.c:3266 #7 0x00005564cd90d93f in address_space_read_full (len=0, buf=<optimized out>, attrs=..., addr=139900019134464, as=<optimized out>) 
    at /srv/QEMU/Source/exec.c:3279
#8 0x00005564cd90d93f in address_space_rw (as=<optimized out>, addr=addr@entry=1544, attrs=..., attrs@entry=..., buf=<optimized out>, len=len@entry=4, is_write=is_write@entry=false) at /srv/QEMU/Source/exec.c:3307 #9 0x00005564cd994273 in kvm_handle_io (count=1, size=4, direction=<optimized out>, data=<optimized out>, attrs=..., port=1544) 
    at /srv/QEMU/Source/accel/kvm/kvm-all.c:2104
#10 0x00005564cd994273 in kvm_cpu_exec (cpu=cpu@entry=0x5564cecde430) at /srv/QEMU/Source/accel/kvm/kvm-all.c:2350 #11 0x00005564cd96a704 in qemu_kvm_cpu_thread_fn (arg=0x5564cecde430) at /srv/QEMU/Source/cpus.c:1318 #12 0x00005564cd96a704 in qemu_kvm_cpu_thread_fn (arg=arg@entry=0x5564cecde430) at /srv/QEMU/Source/cpus.c:1290 #13 0x00005564cde58eca in qemu_thread_start (args=<optimized out>) at /srv/QEMU/Source/util/qemu-thread-posix.c:519 #14 0x00007f3d12c6bfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486 #15 0x00007f3d12b9c4cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 

Thread 9 (Thread 0x7f3cf9ffb700 (LWP 77087)):
#0 0x00007f3d12c7529c in __lll_lock_wait () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:103 #1 0x00007f3d12c6e714 in __GI___pthread_mutex_lock (mutex=mutex@entry=0x5564ce5bc740 <qemu_global_mutex>) at ../nptl/pthread_mutex_lock.c:80 #2 0x00005564cde59023 in qemu_mutex_lock_impl (mutex=0x5564ce5bc740 <qemu_global_mutex>, file=0x5564cdf1d004 "/srv/QEMU/Source/exec.c", line=3129) 
    at /srv/QEMU/Source/util/qemu-thread-posix.c:78
#3 0x00005564cd96c27e in qemu_mutex_lock_iothread_impl (file=file@entry=0x5564cdf1d004 "/srv/QEMU/Source/exec.c", line=line@entry=3129) 
    at /srv/QEMU/Source/cpus.c:1899
#4 0x00005564cd90d155 in prepare_mmio_access (mr=0x5564cf271f10, mr=0x5564cf271f10) at /srv/QEMU/Source/exec.c:3129 
#5  0x00005564cd90d155 in flatview_read_continue
(fv=0x7f3ce0649880, addr=1544, attrs=..., buf=0x7f3d042e1000 "", len=4, addr1=<optimized out>, l=<optimized out>, mr=0x5564cf271f10) 
    at /srv/QEMU/Source/exec.c:3225
#6 0x00005564cd90d30d in flatview_read (fv=0x7f3ce0649880, addr=1544, attrs=..., buf=0x7f3d042e1000 "", len=4) at /srv/QEMU/Source/exec.c:3266 #7 0x00005564cd90d93f in address_space_read_full (len=0, buf=<optimized out>, attrs=..., addr=139900039856128, as=<optimized out>) 
    at /srv/QEMU/Source/exec.c:3279
#8 0x00005564cd90d93f in address_space_rw (as=<optimized out>, addr=addr@entry=1544, attrs=..., attrs@entry=..., buf=<optimized out>, len=len@entry=4, is_write=is_write@entry=false) at /srv/QEMU/Source/exec.c:3307 #9 0x00005564cd994273 in kvm_handle_io (count=1, size=4, direction=<optimized out>, data=<optimized out>, attrs=..., port=1544) 
    at /srv/QEMU/Source/accel/kvm/kvm-all.c:2104
#10 0x00005564cd994273 in kvm_cpu_exec (cpu=cpu@entry=0x5564cecb66f0) at /srv/QEMU/Source/accel/kvm/kvm-all.c:2350 #11 0x00005564cd96a704 in qemu_kvm_cpu_thread_fn (arg=0x5564cecb66f0) at /srv/QEMU/Source/cpus.c:1318 #12 0x00005564cd96a704 in qemu_kvm_cpu_thread_fn (arg=arg@entry=0x5564cecb66f0) at /srv/QEMU/Source/cpus.c:1290 #13 0x00005564cde58eca in qemu_thread_start (args=<optimized out>) at /srv/QEMU/Source/util/qemu-thread-posix.c:519 #14 0x00007f3d12c6bfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486 #15 0x00007f3d12b9c4cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 

Thread 8 (Thread 0x7f3cfa7fc700 (LWP 77086)):
#0 0x00007f3d12c7529c in __lll_lock_wait () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:103 #1 0x00007f3d12c6e714 in __GI___pthread_mutex_lock (mutex=mutex@entry=0x5564ce5bc740 <qemu_global_mutex>) at ../nptl/pthread_mutex_lock.c:80 #2 0x00005564cde59023 in qemu_mutex_lock_impl (mutex=0x5564ce5bc740 <qemu_global_mutex>, file=0x5564cdf1d004 "/srv/QEMU/Source/exec.c", line=3129) 
    at /srv/QEMU/Source/util/qemu-thread-posix.c:78
#3 0x00005564cd96c27e in qemu_mutex_lock_iothread_impl (file=file@entry=0x5564cdf1d004 "/srv/QEMU/Source/exec.c", line=line@entry=3129) 
    at /srv/QEMU/Source/cpus.c:1899
#4 0x00005564cd90d155 in prepare_mmio_access (mr=0x5564cf271f10, mr=0x5564cf271f10) at /srv/QEMU/Source/exec.c:3129 
#5  0x00005564cd90d155 in flatview_read_continue
(fv=0x7f3ce0649880, addr=1544, attrs=..., buf=0x7f3d042e4000 "", len=4, addr1=<optimized out>, l=<optimized out>, mr=0x5564cf271f10) 
    at /srv/QEMU/Source/exec.c:3225
#6 0x00005564cd90d30d in flatview_read (fv=0x7f3ce0649880, addr=1544, attrs=..., buf=0x7f3d042e4000 "", len=4) at /srv/QEMU/Source/exec.c:3266 #7 0x00005564cd90d93f in address_space_read_full (len=0, buf=<optimized out>, attrs=..., addr=139900039868416, as=<optimized out>) 
    at /srv/QEMU/Source/exec.c:3279
#8 0x00005564cd90d93f in address_space_rw (as=<optimized out>, addr=addr@entry=1544, attrs=..., attrs@entry=..., buf=<optimized out>, len=len@entry=4, is_write=is_write@entry=false) at /srv/QEMU/Source/exec.c:3307 #9 0x00005564cd994273 in kvm_handle_io (count=1, size=4, direction=<optimized out>, data=<optimized out>, attrs=..., port=1544) 
    at /srv/QEMU/Source/accel/kvm/kvm-all.c:2104
#10 0x00005564cd994273 in kvm_cpu_exec (cpu=cpu@entry=0x5564cec8da00) at /srv/QEMU/Source/accel/kvm/kvm-all.c:2350 #11 0x00005564cd96a704 in qemu_kvm_cpu_thread_fn (arg=0x5564cec8da00) at /srv/QEMU/Source/cpus.c:1318 #12 0x00005564cd96a704 in qemu_kvm_cpu_thread_fn (arg=arg@entry=0x5564cec8da00) at /srv/QEMU/Source/cpus.c:1290 #13 0x00005564cde58eca in qemu_thread_start (args=<optimized out>) at /srv/QEMU/Source/util/qemu-thread-posix.c:519 #14 0x00007f3d12c6bfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486 #15 0x00007f3d12b9c4cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 

Thread 7 (Thread 0x7f3d01fff700 (LWP 77085)):
#0 0x00007f3d12c7529c in __lll_lock_wait () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:103 #1 0x00007f3d12c6e714 in __GI___pthread_mutex_lock (mutex=mutex@entry=0x5564ce5bc740 <qemu_global_mutex>) at ../nptl/pthread_mutex_lock.c:80 #2 0x00005564cde59023 in qemu_mutex_lock_impl (mutex=0x5564ce5bc740 <qemu_global_mutex>, file=0x5564cdf1d004 "/srv/QEMU/Source/exec.c", line=3129) 
    at /srv/QEMU/Source/util/qemu-thread-posix.c:78
#3 0x00005564cd96c27e in qemu_mutex_lock_iothread_impl (file=file@entry=0x5564cdf1d004 "/srv/QEMU/Source/exec.c", line=line@entry=3129) 
    at /srv/QEMU/Source/cpus.c:1899
#4 0x00005564cd90d155 in prepare_mmio_access (mr=0x5564cf271f10, mr=0x5564cf271f10) at /srv/QEMU/Source/exec.c:3129 
#5  0x00005564cd90d155 in flatview_read_continue
(fv=0x7f3ce0649880, addr=1544, attrs=..., buf=0x7f3d042e7000 "", len=4, addr1=<optimized out>, l=<optimized out>, mr=0x5564cf271f10) 
    at /srv/QEMU/Source/exec.c:3225
#6 0x00005564cd90d30d in flatview_read (fv=0x7f3ce0649880, addr=1544, attrs=..., buf=0x7f3d042e7000 "", len=4) at /srv/QEMU/Source/exec.c:3266 #7 0x00005564cd90d93f in address_space_read_full (len=0, buf=<optimized out>, attrs=..., addr=139900039880704, as=<optimized out>) 
    at /srv/QEMU/Source/exec.c:3279
#8 0x00005564cd90d93f in address_space_rw (as=<optimized out>, addr=addr@entry=1544, attrs=..., attrs@entry=..., buf=<optimized out>, len=len@entry=4, is_write=is_write@entry=false) at /srv/QEMU/Source/exec.c:3307 #9 0x00005564cd994273 in kvm_handle_io (count=1, size=4, direction=<optimized out>, data=<optimized out>, attrs=..., port=1544) at /srv/QEMU/Source/accel/kvm/kvm-all.c:2104 #10 0x00005564cd994273 in kvm_cpu_exec (cpu=cpu@entry=0x5564cec65f40) at /srv/QEMU/Source/accel/kvm/kvm-all.c:2350 #11 0x00005564cd96a704 in qemu_kvm_cpu_thread_fn (arg=0x5564cec65f40) at /srv/QEMU/Source/cpus.c:1318 #12 0x00005564cd96a704 in qemu_kvm_cpu_thread_fn (arg=arg@entry=0x5564cec65f40) at /srv/QEMU/Source/cpus.c:1290 #13 0x00005564cde58eca in qemu_thread_start (args=<optimized out>) at /srv/QEMU/Source/util/qemu-thread-posix.c:519 #14 0x00007f3d12c6bfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486 #15 0x00007f3d12b9c4cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 

Thread 6 (Thread 0x7f3d00f1b700 (LWP 77084)):
#0 0x00007f3d12c7529c in __lll_lock_wait () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:103 #1 0x00007f3d12c6e714 in __GI___pthread_mutex_lock (mutex=mutex@entry=0x5564ce5bc740 <qemu_global_mutex>) at ../nptl/pthread_mutex_lock.c:80 #2 0x00005564cde59023 in qemu_mutex_lock_impl (mutex=0x5564ce5bc740 <qemu_global_mutex>, file=0x5564cdf1d004 "/srv/QEMU/Source/exec.c", line=3129) at /srv/QEMU/Source/util/qemu-thread-posix.c:78 #3 0x00005564cd96c27e in qemu_mutex_lock_iothread_impl (file=file@entry=0x5564cdf1d004 "/srv/QEMU/Source/exec.c", line=line@entry=3129) at /srv/QEMU/Source/cpus.c:1899 #4 0x00005564cd90d155 in prepare_mmio_access (mr=0x5564cf271f10, mr=0x5564cf271f10) at /srv/QEMU/Source/exec.c:3129 #5 0x00005564cd90d155 in flatview_read_continue (fv=0x7f3ce0649880, addr=1544, attrs=..., buf=0x7f3d042ea000 "", len=4, addr1=<optimized out>, l=<optimized out>, mr=0x5564cf271f10) at /srv/QEMU/Source/exec.c:3225 #6 0x00005564cd90d30d in flatview_read (fv=0x7f3ce0649880, addr=1544, attrs=..., buf=0x7f3d042ea000 "", len=4) at /srv/QEMU/Source/exec.c:3266 #7 0x00005564cd90d93f in address_space_read_full (len=0, buf=<optimized out>, attrs=..., addr=139900039892992, as=<optimized out>) at /srv/QEMU/Source/exec.c:3279 #8 0x00005564cd90d93f in address_space_rw (as=<optimized out>, addr=addr@entry=1544, attrs=..., attrs@entry=..., buf=<optimized out>, len=len@entry=4, is_write=is_write@entry=false) at /srv/QEMU/Source/exec.c:3307 #9 0x00005564cd994273 in kvm_handle_io (count=1, size=4, direction=<optimized out>, data=<optimized out>, attrs=..., port=1544) at /srv/QEMU/Source/accel/kvm/kvm-all.c:2104 #10 0x00005564cd994273 in kvm_cpu_exec (cpu=cpu@entry=0x5564cec3e4f0) at /srv/QEMU/Source/accel/kvm/kvm-all.c:2350 #11 0x00005564cd96a704 in qemu_kvm_cpu_thread_fn (arg=0x5564cec3e4f0) at /srv/QEMU/Source/cpus.c:1318 #12 0x00005564cd96a704 in qemu_kvm_cpu_thread_fn (arg=arg@entry=0x5564cec3e4f0) at /srv/QEMU/Source/cpus.c:1290 #13 0x00005564cde58eca in qemu_thread_start (args=<optimized out>) at /srv/QEMU/Source/util/qemu-thread-posix.c:519 #14 0x00007f3d12c6bfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486 #15 0x00007f3d12b9c4cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 

Thread 5 (Thread 0x7f3cfbfff700 (LWP 77083)):
#0 0x00007f3d12c7529c in __lll_lock_wait () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:103 #1 0x00007f3d12c6e714 in __GI___pthread_mutex_lock (mutex=mutex@entry=0x5564ce5bc740 <qemu_global_mutex>) at ../nptl/pthread_mutex_lock.c:80 #2 0x00005564cde59023 in qemu_mutex_lock_impl (mutex=0x5564ce5bc740 <qemu_global_mutex>, file=0x5564cdf1d004 "/srv/QEMU/Source/exec.c", line=3129) at /srv/QEMU/Source/util/qemu-thread-posix.c:78 #3 0x00005564cd96c27e in qemu_mutex_lock_iothread_impl (file=file@entry=0x5564cdf1d004 "/srv/QEMU/Source/exec.c", line=line@entry=3129) at /srv/QEMU/Source/cpus.c:1899 #4 0x00005564cd90d155 in prepare_mmio_access (mr=0x5564cf271f10, mr=0x5564cf271f10) at /srv/QEMU/Source/exec.c:3129 #5 0x00005564cd90d155 in flatview_read_continue (fv=0x7f3ce0649880, addr=1544, attrs=..., buf=0x7f3d042ed000 "", len=4, addr1=<optimized out>, l=<optimized out>, mr=0x5564cf271f10) at /srv/QEMU/Source/exec.c:3225 #6 0x00005564cd90d30d in flatview_read (fv=0x7f3ce0649880, addr=1544, attrs=..., buf=0x7f3d042ed000 "", len=4) at /srv/QEMU/Source/exec.c:3266 #7 0x00005564cd90d93f in address_space_read_full (len=0, buf=<optimized out>, attrs=..., addr=139900039905280, as=<optimized out>) at /srv/QEMU/Source/exec.c:3279 #8 0x00005564cd90d93f in address_space_rw (as=<optimized out>, addr=addr@entry=1544, attrs=..., attrs@entry=..., buf=<optimized out>, len=len@entry=4, is_write=is_write@entry=false) at /srv/QEMU/Source/exec.c:3307 #9 0x00005564cd994273 in kvm_handle_io (count=1, size=4, direction=<optimized out>, data=<optimized out>, attrs=..., port=1544) at /srv/QEMU/Source/accel/kvm/kvm-all.c:2104 #10 0x00005564cd994273 in kvm_cpu_exec (cpu=cpu@entry=0x5564cec16c30) at /srv/QEMU/Source/accel/kvm/kvm-all.c:2350 #11 0x00005564cd96a704 in qemu_kvm_cpu_thread_fn (arg=0x5564cec16c30) at /srv/QEMU/Source/cpus.c:1318 #12 0x00005564cd96a704 in qemu_kvm_cpu_thread_fn (arg=arg@entry=0x5564cec16c30) at /srv/QEMU/Source/cpus.c:1290 #13 0x00005564cde58eca in qemu_thread_start (args=<optimized out>) at /srv/QEMU/Source/util/qemu-thread-posix.c:519 #14 0x00007f3d12c6bfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486 #15 0x00007f3d12b9c4cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 

Thread 4 (Thread 0x7f3cfb7fe700 (LWP 77082)):
#0 0x00007f3d12b93427 in ioctl () at ../sysdeps/unix/syscall-template.S:78 #1 0x00005564cd993e99 in kvm_vcpu_ioctl (cpu=cpu@entry=0x5564cebee630, type=type@entry=44672) at /srv/QEMU/Source/accel/kvm/kvm-all.c:2473 #2 0x00005564cd993fd1 in kvm_cpu_exec (cpu=cpu@entry=0x5564cebee630) at /srv/QEMU/Source/accel/kvm/kvm-all.c:2310 #3 0x00005564cd96a704 in qemu_kvm_cpu_thread_fn (arg=0x5564cebee630) at /srv/QEMU/Source/cpus.c:1318 #4 0x00005564cd96a704 in qemu_kvm_cpu_thread_fn (arg=arg@entry=0x5564cebee630) at /srv/QEMU/Source/cpus.c:1290 #5 0x00005564cde58eca in qemu_thread_start (args=<optimized out>) at /srv/QEMU/Source/util/qemu-thread-posix.c:519 #6 0x00007f3d12c6bfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486 #7 0x00007f3d12b9c4cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 

Thread 3 (Thread 0x7f3cfaffd700 (LWP 77081)):
#0 0x00007f3d12c7529c in __lll_lock_wait () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:103 #1 0x00007f3d12c6e714 in __GI___pthread_mutex_lock (mutex=mutex@entry=0x5564ce5bc740 <qemu_global_mutex>) at ../nptl/pthread_mutex_lock.c:80 #2 0x00005564cde59023 in qemu_mutex_lock_impl (mutex=0x5564ce5bc740 <qemu_global_mutex>, file=0x5564cdf1d004 "/srv/QEMU/Source/exec.c", line=3129) at /srv/QEMU/Source/util/qemu-thread-posix.c:78 #3 0x00005564cd96c27e in qemu_mutex_lock_iothread_impl (file=file@entry=0x5564cdf1d004 "/srv/QEMU/Source/exec.c", line=line@entry=3129) at /srv/QEMU/Source/cpus.c:1899 #4 0x00005564cd90d155 in prepare_mmio_access (mr=0x5564cf778c60, mr=0x5564cf778c60) at /srv/QEMU/Source/exec.c:3129 #5 0x00005564cd90d155 in flatview_read_continue (fv=0x7f3ce10cb670, addr=34896613376, attrs=..., buf=0x7f3d149d3028 "", len=1, addr1=<optimized out>, l=<optimized out>, mr=0x5564cf778c60) at /srv/QEMU/Source/exec.c:3225 #6 0x00005564cd90d30d in flatview_read (fv=0x7f3ce10cb670, addr=34896613376, attrs=..., buf=0x7f3d149d3028 "", len=1) at /srv/QEMU/Source/exec.c:3266 #7 0x00005564cd90d93f in address_space_read_full (len=<optimized out>, buf=0x0, attrs=..., addr=<optimized out>, as=<optimized out>) at /srv/QEMU/Source/exec.c:3279 #8 0x00005564cd90d93f in address_space_rw (as=<optimized out>, addr=<optimized out>, attrs=..., attrs@entry=..., buf=buf@entry=0x7f3d149d3028 "", len=<optimized out>, is_write=<optimized out>) at /srv/QEMU/Source/exec.c:3307 #9 0x00005564cd994199 in kvm_cpu_exec (cpu=cpu@entry=0x5564ceb9e850) at /srv/QEMU/Source/accel/kvm/kvm-all.c:2360 #10 0x00005564cd96a704 in qemu_kvm_cpu_thread_fn (arg=0x5564ceb9e850) at /srv/QEMU/Source/cpus.c:1318 #11 0x00005564cd96a704 in qemu_kvm_cpu_thread_fn (arg=arg@entry=0x5564ceb9e850) at /srv/QEMU/Source/cpus.c:1290 #12 0x00005564cde58eca in qemu_thread_start (args=<optimized out>) at /srv/QEMU/Source/util/qemu-thread-posix.c:519 #13 0x00007f3d12c6bfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486 #14 0x00007f3d12b9c4cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 

Thread 2 (Thread 0x7f3d04218700 (LWP 77049)):
#0 0x00007f3d12b96f59 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38 #1 0x00005564cde59cfb in qemu_futex_wait (val=<optimized out>, f=<optimized out>) at /srv/QEMU/Source/util/qemu-thread-posix.c:455 #2 0x00005564cde59cfb in qemu_event_wait (ev=ev@entry=0x5564ce5f6488 <rcu_call_ready_event>) at /srv/QEMU/Source/util/qemu-thread-posix.c:459 #3 0x00005564cde7190f in call_rcu_thread (opaque=opaque@entry=0x0) at /srv/QEMU/Source/util/rcu.c:260 #4 0x00005564cde58eca in qemu_thread_start (args=<optimized out>) at /srv/QEMU/Source/util/qemu-thread-posix.c:519 #5 0x00007f3d12c6bfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486 #6 0x00007f3d12b9c4cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 

Thread 1 (Thread 0x7f3d043556c0 (LWP 77047)):
#0 0x00007f3d12b93427 in ioctl () at ../sysdeps/unix/syscall-template.S:78 #1 0x00005564cd990364 in kvm_vm_ioctl (s=s@entry=0x5564ce92f3e0, type=-1073172889) at /srv/QEMU/Source/accel/kvm/kvm-all.c:2455 #2 0x00005564cd991a75 in kvm_set_irq (s=0x5564ce92f3e0, irq=irq@entry=8, level=level@entry=1) at /srv/QEMU/Source/accel/kvm/kvm-all.c:1253 #3 0x00005564cda3daa3 in kvm_pic_set_irq (opaque=<optimized out>, irq=8, level=1) at /srv/QEMU/Source/hw/i386/kvm/i8259.c:118 #4 0x00005564cd9e52d3 in qemu_irq_raise (irq=<optimized out>) at /srv/QEMU/Source/include/hw/irq.h:12 #5 0x00005564cd9e52d3 in rtc_policy_slew_deliver_irq (s=0x5564cee46000) at /srv/QEMU/Source/hw/rtc/mc146818rtc.c:125 #6 0x00005564cd9e52d3 in rtc_periodic_timer (opaque=0x5564cee46000) at /srv/QEMU/Source/hw/rtc/mc146818rtc.c:256 #7 0x00005564cde54d41 in timerlist_run_timers (timer_list=0x5564ce8eae90) at /srv/QEMU/Source/util/qemu-timer.c:588 #8 0x00005564cde55125 in timerlist_run_timers (timer_list=<optimized out>) at /srv/QEMU/Source/util/qemu-timer.c:508 #9 0x00005564cde55125 in qemu_clock_run_timers (type=QEMU_CLOCK_HOST) at /srv/QEMU/Source/util/qemu-timer.c:602 #10 0x00005564cde55125 in qemu_clock_run_all_timers () at /srv/QEMU/Source/util/qemu-timer.c:688 #11 0x00005564cde557c0 in main_loop_wait (nonblocking=<optimized out>) at /srv/QEMU/Source/util/main-loop.c:525 
#12 0x00005564cdacf3ae in main_loop () at /srv/QEMU/Source/vl.c:1686
#13 0x00005564cd902edc in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at /srv/QEMU/Source/vl.c:4312
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