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

[Alex Bennée]

Can you please re-test on the current master, I think this was fixed by:

commit e84fcd7f662a0d8198703f6f89416d7ac2c32767
Author: Richard Henderson <address@hidden>
Date:   Tue Nov 13 20:35:10 2018 +0100

    target/i386: Generate #UD when applying LOCK to a register
destination

Testing on my box:

12:14:20 address@hidden:~/l/qemu.git] master + ./i386-linux-user/qemu-i386 
~/tcg_crash.elf
qemu: uncaught target signal 4 (Illegal instruction) - core dumped
fish: “./i386-linux-user/qemu-i386 ~/t…” terminated by signal SIGILL (Illegal 
instruction)


** Changed in: qemu
       Status: New => Fix Committed

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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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