Re: [Qemu-devel] [Bug 1803160] Re: qemu-3.1.0-rc0: tcg.c crash in temp_load

[Philippe Mathieu-Daudé]

Hi Alberto,

Can you open another ticket for your new bug?

Thanks.

On Fri, Dec 7, 2018 at 6:22 PM Richard Henderson <address@hidden> wrote:
>
> This second crash is of course a different bug.
>
> --
> You received this bug notification because you are a member of qemu-
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> https://bugs.launchpad.net/bugs/1803160
>
> Title:
>   qemu-3.1.0-rc0: tcg.c crash in temp_load
>
> Status in QEMU:
>   Fix Committed
>
> Bug description:
>   QEMU version:
>   -------------
>
>   qemu-3.1.0-rc0 compiled from sources (earlier versions also affected)
>
>   Summary:
>   --------
>
>   TCG crashes in i386 and x86_64 when it tries to execute some specific
>   illegal instructions. When running full OS emulation, both the guest
>   system and QEMU crash.
>
>   The issue has been reproduced in two scenarios:
>
>   Ubuntu x64 host running Debian x86 guest with the following command
>   line: qemu-system-x86_64 -m 4G debian.qcow
>
>   When the attached ELF file is executed inside the guest, QEMU crashes.
>
>   It can also be reproduced from the command line:
>
>   $ qemu-i386 tcg_crash.elf
>   /home/alberto/Documents/qemu-3.1.0-rc0/tcg/tcg.c:2863: tcg fatal error
>   qemu: uncaught target signal 11 (Segmentation fault) - core dumped
>   zsh: segmentation fault (core dumped)  
> ../qemu-3.1.0-rc0/build/i386-linux-user/qemu-i386 tcg_crash.elf
>
>   GDB backtrace:
>
>   (gdb) bt
>   #0  0x0000000060206488 in raise ()
>   #1  0x0000000060206b8a in abort ()
>   #2  0x0000000060007016 in temp_load (address@hidden <tcg_init_ctx>, 
> address@hidden <tcg_init_ctx+2552>, desired_regs=<optimized out>, 
> address@hidden)
>       at /home/alberto/Documents/qemu-3.1.0-rc0/tcg/tcg.c:2863
>   #3  0x000000006000a4d9 in tcg_reg_alloc_op (op=0x62808c20, s=<optimized 
> out>) at /home/alberto/Documents/qemu-3.1.0-rc0/tcg/tcg.c:3070
>   #4  tcg_gen_code (s=<optimized out>, address@hidden 
> <static_code_gen_buffer+4144>) at 
> /home/alberto/Documents/qemu-3.1.0-rc0/tcg/tcg.c:3598
>   #5  0x000000006003ef9a in tb_gen_code (address@hidden, address@hidden, 
> address@hidden, address@hidden, address@hidden)
>       at /home/alberto/Documents/qemu-3.1.0-rc0/accel/tcg/translate-all.c:1752
>   #6  0x000000006003d979 in tb_find (cf_mask=0, tb_exit=0, last_tb=0x0, 
> cpu=0x0) at /home/alberto/Documents/qemu-3.1.0-rc0/accel/tcg/cpu-exec.c:404
>   #7  cpu_exec (address@hidden) at 
> /home/alberto/Documents/qemu-3.1.0-rc0/accel/tcg/cpu-exec.c:724
>   #8  0x000000006006e1a0 in cpu_loop (address@hidden) at 
> /home/alberto/Documents/qemu-3.1.0-rc0/linux-user/i386/cpu_loop.c:93
>   #9  0x00000000600037c5 in main (argc=2, argv=0x7fffffffdd28, 
> envp=<optimized out>) at 
> /home/alberto/Documents/qemu-3.1.0-rc0/linux-user/main.c:819
>   (gdb)
>
>   Testcase:
>   ---------
>
>   Find ELF file attached.
>
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