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

[alvise rigo]

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

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