Re: [Qemu-devel] [RFC 0/5] Slow-path for atomic instruction translation

[Emilio G. Cota]

On Mon, May 11, 2015 at 11:10:05 +0200, alvise rigo wrote:
> the last commit was b8df9208f357d2b36e1b19634aea973618dc7ba8.

Thanks.

Unfortunately a segfault still happens very early:

$ gdb arm-softmmu/qemu-system-arm
GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2.1) 7.4-2012.04
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.launchpad.net/gdb-linaro/>...
Reading symbols from 
/local/home/cota/src/qemu/arm-softmmu/qemu-system-arm...done.
(gdb) set args  -M vexpress-a9 -kernel img/arm/zImage -drive 
file=img/arm/rootfs.ext2,if=sd -append "console=ttyAMA0,115200 
root=/dev/mmcblk0" -net nic,model=lan9118 -net user -nographic -smp 1
(gdb) r
Starting program: /local/home/cota/src/qemu/arm-softmmu/qemu-system-arm -M 
vexpress-a9 -kernel img/arm/zImage -drive file=img/arm/rootfs.ext2,if=sd 
-append "console=ttyAMA0,115200 root=/dev/mmcblk0" -net nic,model=lan9118 -net 
user -nographic -smp 1
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe9447700 (LWP 4309)]
[New Thread 0x7fffe5246700 (LWP 4310)]
WARNING: Image format was not specified for 'img/arm/rootfs.ext2' and probing 
guessed raw.
         Automatically detecting the format is dangerous for raw images, write 
operations on block 0 will be restricted.
         Specify the 'raw' format explicitly to remove the restrictions.
[New Thread 0x7fffe4a45700 (LWP 4311)]
audio: Could not init `oss' audio driver

Program received signal SIGUSR1, User defined signal 1.
[Switching to Thread 0x7fffe4a45700 (LWP 4311)]
pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
162     ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S: No such 
file or directory.
(gdb) cont
Continuing.

Program received signal SIGSEGV, Segmentation fault.
0x0000555555655c34 in test_bit (addr=<optimized out>, nr=<optimized out>)
    at /local/home/cota/src/qemu/include/qemu/bitops.h:119
119             return 1UL & (addr[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
(gdb) bt
#0  0x0000555555655c34 in test_bit (addr=<optimized out>, nr=<optimized out>)
    at /local/home/cota/src/qemu/include/qemu/bitops.h:119
#1  cpu_physical_memory_excl_is_dirty (addr=18446744073709551615)
    at /local/home/cota/src/qemu/include/exec/ram_addr.h:214
#2  tlb_set_page (cpu=<optimized out>, vaddr=<optimized out>, paddr=503316480, 
    prot=<optimized out>, mmu_idx=3, size=<optimized out>)
    at /local/home/cota/src/qemu/cputlb.c:327
#3  0x0000555555712091 in arm_cpu_handle_mmu_fault (cs=0x55555632c4e0, 
    address=<optimized out>, access_type=0, mmu_idx=3)
    at /local/home/cota/src/qemu/target-arm/helper.c:5726
#4  0x0000555555704f70 in tlb_fill (cs=0x55555632c4e0, addr=<optimized out>, 
    is_write=<optimized out>, mmu_idx=<optimized out>, retaddr=140737065132893)
    at /local/home/cota/src/qemu/target-arm/op_helper.c:69
#5  0x000055555565733f in helper_le_ldul_mmu (env=0x555556334730, 
    addr=503316484, mmu_idx=3, retaddr=<optimized out>)
    at /local/home/cota/src/qemu/softmmu_template.h:190
#6  0x00007fffe6c623db in code_gen_buffer ()
#7  0x00005555556148ba in cpu_tb_exec (
    tb_ptr=0x7fffe6c62320 "A\213n\374\205\355\017\205\207", cpu=0x55555632c4e0)
    at /local/home/cota/src/qemu/cpu-exec.c:199
#8  cpu_arm_exec (env=0x555556334730)
    at /local/home/cota/src/qemu/cpu-exec.c:519
#9  0x000055555563a880 in tcg_cpu_exec (env=0x555556334730)
    at /local/home/cota/src/qemu/cpus.c:1354
#10 tcg_exec_all () at /local/home/cota/src/qemu/cpus.c:1387
#11 qemu_tcg_cpu_thread_fn (arg=<optimized out>)
    at /local/home/cota/src/qemu/cpus.c:1032
#12 0x00007ffff40dfe9a in start_thread (arg=0x7fffe4a45700)
    at pthread_create.c:308
#13 0x00007ffff3e0d38d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#14 0x0000000000000000 in ?? ()

                Emilio