Re: [Qemu-devel] [PATCH v2 0/3] target/arm: Reduce overhead of cpu_get_tb_cpu_state

[Emilio G. Cota]

On Thu, Feb 21, 2019 at 22:36:25 +0000, Alex Bennée wrote:
> Emilio G. Cota <address@hidden> writes:
> > This brings my arm-softmmu bootup+shutdown test to an early death:
> 
> Can you retry with --enable-tcg-debug?

Should have done so the first time. Here it is:

(gdb) r                                          
Starting program: /data/src/qemu/build/arm-softmmu/qemu-system-arm -machine 
type=virt -nographic -m 4096 -netdev user,id=unet,hostfwd=tcp::2222-:22 -d
evice virtio-net-device,netdev=unet -drive 
file=../img/arm/jessie-arm32-die-on-boot.qcow2,id=myblock,index=0,if=none 
-device virtio-blk-device,drive=m
yblock -kernel ../img/arm/aarch32-current-linux-kernel-only.img -append 
console=ttyAMA0\ root=/dev/vda1 -name arm,debug-threads=on -smp 1
[...]
VFS: Mounted root (ext4 filesystem) readonly on device 254:1.
devtmpfs: mounted
Freeing unused kernel memory: 300K (80669000 - 806b4000)
**
ERROR:/data/src/qemu/target/arm/helper.c:14049:cpu_get_tb_cpu_state: assertion 
failed (flags == check_flags): (0x10080000 == 0x10080080)

Thread 4 "CPU 0/TCG" received signal SIGABRT, Aborted.
[Switching to Thread 0x7fffee2aa700 (LWP 14033)]
__GI_raise (address@hidden) at ../sysdeps/unix/sysv/linux/raise.c:51
51      ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0  __GI_raise (address@hidden) at ../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007ffff4585801 in __GI_abort () at abort.c:79
#2  0x00007ffff570f2a5 in g_assertion_message () from 
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff570f652 in g_assertion_message_cmpnum () from 
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00005555559a339b in cpu_get_tb_cpu_state (env=0x5555565af060, 
address@hidden, address@hidden,
    address@hidden) at /data/src/qemu/target/arm/helper.c:14049
#5  0x000055555588fbdb in tb_lookup__cpu_state (cf_mask=524288, 
flags=0x7fffee2a9900, cs_base=0x7fffee2a98f8, pc=0x7fffee2a98fc, cpu=0x0)
    at /data/src/qemu/include/exec/tb-lookup.h:28
#6  tb_find (cf_mask=524288, tb_exit=0, last_tb=0x0, cpu=0x0) at 
/data/src/qemu/accel/tcg/cpu-exec.c:404
#7  cpu_exec (address@hidden) at /data/src/qemu/accel/tcg/cpu-exec.c:728
#8  0x000055555584e49f in tcg_cpu_exec (cpu=0x5555565a6db0) at 
/data/src/qemu/cpus.c:1429
#9  0x0000555555850623 in qemu_tcg_cpu_thread_fn (address@hidden) at 
/data/src/qemu/cpus.c:1733
#10 0x0000555555c83416 in qemu_thread_start (args=<optimized out>) at 
/data/src/qemu/util/qemu-thread-posix.c:502
#11 0x00007ffff493d6db in start_thread (arg=0x7fffee2aa700) at 
pthread_create.c:463
#12 0x00007ffff466688f in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
(gdb)

Thanks,
                Emilio