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

[Alex Bennée]

alvise rigo <address@hidden> writes:

> I'm going to respin these patches soon, I've found some issues that
> I'm addressing now.

Thanks, please feel free to add me to your CC list.

>
> Thank you for your feedback,
> alvise
>
> On Tue, May 26, 2015 at 11:51 PM, Emilio G. Cota <address@hidden> wrote:
>> 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

-- 
Alex Bennée