[Qemu-devel] [Bug 700276] [NEW] QEMU crashed when GDB request a big size variable information

[dazhi]

Public bug reported:

Hello,
My host is Fedora 13. My QEMU version is 0.13.0, I use QEMU with GDB to debug 
Linux kernel(Version 2.6.36.2).

I use QEMU like this:"qemu -s -S -kernel build/arch/i386/boot/bzImage -hda 
/dev/zero"
When GDB connected with QEMU, and use gdb command print to look big size 
variable, the qemu is crash down. for example, when I look a task_struct 
variable 'init_task'(print init_task ), the qemu produce the below message and 
exit.

*** stack smashing detected ***: qemu terminated
======= Backtrace: =========
/lib/libc.so.6(__fortify_fail+0x4d)[0x78a31d]
/lib/libc.so.6[0x78a2ca]
qemu[0x8059e21]
qemu[0x805a0cf]
qemu[0x80d12a1]
qemu[0x8189cb8]
qemu[0x818c3b0]
/lib/libc.so.6(__libc_start_main+0xe6)[0x6a8cc6]
...............
adbf7000-adbf8000 rw-p 00000000 00:00 0 
adbf8000-ae3f8000 rw-p 00000000 00:00 0 
ae3f8000-ae742000 rw-p 00000000 00:00 0 
ae742000-ae762000 rw-p 00000000 00:00 0 
ae762000-ae764000 rw-p 00000000 00:00 0 
ae764000-ae784000 rw-p 00000000 00:00 0 
ae784000-ae786000 rw-p 00000000 00:00 0 
ae786000-b6786000 rw-p 00000000 00:00 0 
b6786000-b7894000 rw-p 00000000 00:00 0 
b78aa000-b78ab000 rw-p 00000000 00:00 0 
bfe95000-bfeaa000 rw-p 00000000 00:00 0          [stack]
已放弃 (core dumped)

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/700276

Title:
  QEMU crashed when GDB request a big size variable information

Status in QEMU:
  New

Bug description:
  Hello,
My host is Fedora 13. My QEMU version is 0.13.0, I use QEMU with GDB to debug 
Linux kernel(Version 2.6.36.2).

I use QEMU like this:"qemu -s -S -kernel build/arch/i386/boot/bzImage -hda 
/dev/zero"
When GDB connected with QEMU, and use gdb command print to look big size 
variable, the qemu is crash down. for example, when I look a task_struct 
variable 'init_task'(print init_task ), the qemu produce the below message and 
exit.

*** stack smashing detected ***: qemu terminated
======= Backtrace: =========
/lib/libc.so.6(__fortify_fail+0x4d)[0x78a31d]
/lib/libc.so.6[0x78a2ca]
qemu[0x8059e21]
qemu[0x805a0cf]
qemu[0x80d12a1]
qemu[0x8189cb8]
qemu[0x818c3b0]
/lib/libc.so.6(__libc_start_main+0xe6)[0x6a8cc6]
...............
adbf7000-adbf8000 rw-p 00000000 00:00 0 
adbf8000-ae3f8000 rw-p 00000000 00:00 0 
ae3f8000-ae742000 rw-p 00000000 00:00 0 
ae742000-ae762000 rw-p 00000000 00:00 0 
ae762000-ae764000 rw-p 00000000 00:00 0 
ae764000-ae784000 rw-p 00000000 00:00 0 
ae784000-ae786000 rw-p 00000000 00:00 0 
ae786000-b6786000 rw-p 00000000 00:00 0 
b6786000-b7894000 rw-p 00000000 00:00 0 
b78aa000-b78ab000 rw-p 00000000 00:00 0 
bfe95000-bfeaa000 rw-p 00000000 00:00 0          [stack]
已放弃 (core dumped)