[Qemu-devel] [Bug 1221966] Re: SIGSEGV in static_code_gen_buffer

[Launchpad Bug Tracker]

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
   Status: Incomplete => Expired

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Title:
  SIGSEGV in static_code_gen_buffer

Status in QEMU:
  Expired

Bug description:
  Trying to run 'ls' (or, anything else as far as I can tell) from a
  SunOS 5.8 box under RHEL 6.4 linux, I get a segfault.  I've tried
  qemu-1.5.3, qemu-1.6.0, and I fetched git://git.qemu-
  project.org/qemu.git.  I've also tried a statically linked sh from
  /sbin/ and it also segfaulted.

  wcolburn@anotheruvula$ gdb bin/qemu-sparc
  GNU gdb (GDB) Red Hat Enterprise Linux (7.2-60.el6_4.1)
  Copyright (C) 2010 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later 
  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-redhat-linux-gnu".
  For bug reporting instructions, please see:
  ...
  Reading symbols from /home/anotheruvula/qemu/bin/qemu-sparc...done.
  (gdb) run ../sparc/ls
  Starting program: /home/anotheruvula/qemu/bin/qemu-sparc ../sparc/ls
  [Thread debugging using libthread_db enabled]

  Program received signal SIGSEGV, Segmentation fault.
  0x78259116 in static_code_gen_buffer ()
  Missing separate debuginfos, use: debuginfo-install glib2-2.22.5-7.el6.x86_64 
glibc-2.12-1.107.el6_4.4.x86_64
  (gdb) where
  #0  0x78259116 in static_code_gen_buffer ()
  #1  0x77f570cd in cpu_tb_exec (cpu=0x7a2b1210, tb_ptr=
  0x782590d0 "A\213n \205í\017\205Í")
  at /home/anotheruvula/qemu-devel/cpu-exec.c:56
  #2  0x77f57b2d in cpu_sparc_exec (env=0x7a2b1348)
  at /home/anotheruvula/qemu-devel/cpu-exec.c:631
  #3  0x77f77f36 in cpu_loop (env=0x7a2b1348)
  at /home/anotheruvula/qemu-devel/linux-user/main.c:1089
  #4  0x77f798ff in main (argc=2, argv=0x7fffdfc8, envp=
  0x7fffdfe0) at /home/anotheruvula/qemu-devel/linux-user/main.c:4083
  (gdb)

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[Qemu-devel] [Bug 1221966] Re: SIGSEGV in static_code_gen_buffer

[Peter Maydell]

Also I just noticed that the original report says the crash is while
trying to run a SunOS binary. This isn't supported at all -- we can run
Linux Sparc binaries with qemu-sparc, not random-other-OS binaries, and
"guest binary crashes" is not an implausible result...

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https://bugs.launchpad.net/bugs/1221966

Title:
  SIGSEGV in static_code_gen_buffer

Status in QEMU:
  Incomplete

Bug description:
  Trying to run 'ls' (or, anything else as far as I can tell) from a
  SunOS 5.8 box under RHEL 6.4 linux, I get a segfault.  I've tried
  qemu-1.5.3, qemu-1.6.0, and I fetched git://git.qemu-
  project.org/qemu.git.  I've also tried a statically linked sh from
  /sbin/ and it also segfaulted.

  wcolburn@anotheruvula$ gdb bin/qemu-sparc
  GNU gdb (GDB) Red Hat Enterprise Linux (7.2-60.el6_4.1)
  Copyright (C) 2010 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later 
  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-redhat-linux-gnu".
  For bug reporting instructions, please see:
  ...
  Reading symbols from /home/anotheruvula/qemu/bin/qemu-sparc...done.
  (gdb) run ../sparc/ls
  Starting program: /home/anotheruvula/qemu/bin/qemu-sparc ../sparc/ls
  [Thread debugging using libthread_db enabled]

  Program received signal SIGSEGV, Segmentation fault.
  0x78259116 in static_code_gen_buffer ()
  Missing separate debuginfos, use: debuginfo-install glib2-2.22.5-7.el6.x86_64 
glibc-2.12-1.107.el6_4.4.x86_64
  (gdb) where
  #0  0x78259116 in static_code_gen_buffer ()
  #1  0x77f570cd in cpu_tb_exec (cpu=0x7a2b1210, tb_ptr=
  0x782590d0 "A\213n \205í\017\205Í")
  at /home/anotheruvula/qemu-devel/cpu-exec.c:56
  #2  0x77f57b2d in cpu_sparc_exec (env=0x7a2b1348)
  at /home/anotheruvula/qemu-devel/cpu-exec.c:631
  #3  0x77f77f36 in cpu_loop (env=0x7a2b1348)
  at /home/anotheruvula/qemu-devel/linux-user/main.c:1089
  #4  0x77f798ff in main (argc=2, argv=0x7fffdfc8, envp=
  0x7fffdfe0) at /home/anotheruvula/qemu-devel/linux-user/main.c:4083
  (gdb)

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[Qemu-devel] [Bug 1221966] Re: SIGSEGV in static_code_gen_buffer

[Thomas Huth]

Triaging old bug tickets ... is this still an issue with the latest
version of QEMU or could we close this ticket nowadays?

** Changed in: qemu
   Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1221966

Title:
  SIGSEGV in static_code_gen_buffer

Status in QEMU:
  Incomplete

Bug description:
  Trying to run 'ls' (or, anything else as far as I can tell) from a
  SunOS 5.8 box under RHEL 6.4 linux, I get a segfault.  I've tried
  qemu-1.5.3, qemu-1.6.0, and I fetched git://git.qemu-
  project.org/qemu.git.  I've also tried a statically linked sh from
  /sbin/ and it also segfaulted.

  wcolburn@anotheruvula$ gdb bin/qemu-sparc
  GNU gdb (GDB) Red Hat Enterprise Linux (7.2-60.el6_4.1)
  Copyright (C) 2010 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later 
  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-redhat-linux-gnu".
  For bug reporting instructions, please see:
  ...
  Reading symbols from /home/anotheruvula/qemu/bin/qemu-sparc...done.
  (gdb) run ../sparc/ls
  Starting program: /home/anotheruvula/qemu/bin/qemu-sparc ../sparc/ls
  [Thread debugging using libthread_db enabled]

  Program received signal SIGSEGV, Segmentation fault.
  0x78259116 in static_code_gen_buffer ()
  Missing separate debuginfos, use: debuginfo-install glib2-2.22.5-7.el6.x86_64 
glibc-2.12-1.107.el6_4.4.x86_64
  (gdb) where
  #0  0x78259116 in static_code_gen_buffer ()
  #1  0x77f570cd in cpu_tb_exec (cpu=0x7a2b1210, tb_ptr=
  0x782590d0 "A\213n \205í\017\205Í")
  at /home/anotheruvula/qemu-devel/cpu-exec.c:56
  #2  0x77f57b2d in cpu_sparc_exec (env=0x7a2b1348)
  at /home/anotheruvula/qemu-devel/cpu-exec.c:631
  #3  0x77f77f36 in cpu_loop (env=0x7a2b1348)
  at /home/anotheruvula/qemu-devel/linux-user/main.c:1089
  #4  0x77f798ff in main (argc=2, argv=0x7fffdfc8, envp=
  0x7fffdfe0) at /home/anotheruvula/qemu-devel/linux-user/main.c:4083
  (gdb)

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[Qemu-devel] [Bug 1221966] Re: SIGSEGV in static_code_gen_buffer

[William D Colburn]

If I run it normally, it crashes in the same way.  If I pass the signal
through it crashes in the same way.  I sort of expect this, since it is
qemu segfaulting when it tries to generate the code buffer, not the
underlying problem.

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https://bugs.launchpad.net/bugs/1221966

Title:
  SIGSEGV in static_code_gen_buffer

Status in QEMU:
  New

Bug description:
  Trying to run 'ls' (or, anything else as far as I can tell) from a
  SunOS 5.8 box under RHEL 6.4 linux, I get a segfault.  I've tried
  qemu-1.5.3, qemu-1.6.0, and I fetched git://git.qemu-
  project.org/qemu.git.  I've also tried a statically linked sh from
  /sbin/ and it also segfaulted.

  wcolburn@anotheruvula/home/anotheruvula/qemu$ gdb bin/qemu-sparc
  GNU gdb (GDB) Red Hat Enterprise Linux (7.2-60.el6_4.1)
  Copyright (C) 2010 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-redhat-linux-gnu.
  For bug reporting instructions, please see:
  http://www.gnu.org/software/gdb/bugs/...
  Reading symbols from /home/anotheruvula/qemu/bin/qemu-sparc...done.
  (gdb) run ../sparc/ls
  Starting program: /home/anotheruvula/qemu/bin/qemu-sparc ../sparc/ls
  [Thread debugging using libthread_db enabled]

  Program received signal SIGSEGV, Segmentation fault.
  0x78259116 in static_code_gen_buffer ()
  Missing separate debuginfos, use: debuginfo-install glib2-2.22.5-7.el6.x86_64 
glibc-2.12-1.107.el6_4.4.x86_64
  (gdb) where
  #0  0x78259116 in static_code_gen_buffer ()
  #1  0x77f570cd in cpu_tb_exec (cpu=0x7a2b1210, tb_ptr=
  0x782590d0 A\213n \205í\017\205Í)
  at /home/anotheruvula/qemu-devel/cpu-exec.c:56
  #2  0x77f57b2d in cpu_sparc_exec (env=0x7a2b1348)
  at /home/anotheruvula/qemu-devel/cpu-exec.c:631
  #3  0x77f77f36 in cpu_loop (env=0x7a2b1348)
  at /home/anotheruvula/qemu-devel/linux-user/main.c:1089
  #4  0x77f798ff in main (argc=2, argv=0x7fffdfc8, envp=
  0x7fffdfe0) at /home/anotheruvula/qemu-devel/linux-user/main.c:4083
  (gdb)

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[Qemu-devel] [Bug 1221966] Re: SIGSEGV in static_code_gen_buffer

[Peter Maydell]

it is qemu segfaulting when it tries to generate the code buffer --
why do you think this? The backtrace you quote shows the segfault inside
static_code_gen_buffer(), which means we are running the generated code,
not doing codegen.

-- 
You received this bug notification because you are a member of qemu-
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https://bugs.launchpad.net/bugs/1221966

Title:
  SIGSEGV in static_code_gen_buffer

Status in QEMU:
  New

Bug description:
  Trying to run 'ls' (or, anything else as far as I can tell) from a
  SunOS 5.8 box under RHEL 6.4 linux, I get a segfault.  I've tried
  qemu-1.5.3, qemu-1.6.0, and I fetched git://git.qemu-
  project.org/qemu.git.  I've also tried a statically linked sh from
  /sbin/ and it also segfaulted.

  wcolburn@anotheruvula/home/anotheruvula/qemu$ gdb bin/qemu-sparc
  GNU gdb (GDB) Red Hat Enterprise Linux (7.2-60.el6_4.1)
  Copyright (C) 2010 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-redhat-linux-gnu.
  For bug reporting instructions, please see:
  http://www.gnu.org/software/gdb/bugs/...
  Reading symbols from /home/anotheruvula/qemu/bin/qemu-sparc...done.
  (gdb) run ../sparc/ls
  Starting program: /home/anotheruvula/qemu/bin/qemu-sparc ../sparc/ls
  [Thread debugging using libthread_db enabled]

  Program received signal SIGSEGV, Segmentation fault.
  0x78259116 in static_code_gen_buffer ()
  Missing separate debuginfos, use: debuginfo-install glib2-2.22.5-7.el6.x86_64 
glibc-2.12-1.107.el6_4.4.x86_64
  (gdb) where
  #0  0x78259116 in static_code_gen_buffer ()
  #1  0x77f570cd in cpu_tb_exec (cpu=0x7a2b1210, tb_ptr=
  0x782590d0 A\213n \205í\017\205Í)
  at /home/anotheruvula/qemu-devel/cpu-exec.c:56
  #2  0x77f57b2d in cpu_sparc_exec (env=0x7a2b1348)
  at /home/anotheruvula/qemu-devel/cpu-exec.c:631
  #3  0x77f77f36 in cpu_loop (env=0x7a2b1348)
  at /home/anotheruvula/qemu-devel/linux-user/main.c:1089
  #4  0x77f798ff in main (argc=2, argv=0x7fffdfc8, envp=
  0x7fffdfe0) at /home/anotheruvula/qemu-devel/linux-user/main.c:4083
  (gdb)

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[Qemu-devel] [Bug 1221966] Re: SIGSEGV in static_code_gen_buffer

[William D Colburn]

Oh is it?  Sorry, I guess I didn't understand what that function was
doing.  That thing is sort of confusing in there...

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https://bugs.launchpad.net/bugs/1221966

Title:
  SIGSEGV in static_code_gen_buffer

Status in QEMU:
  New

Bug description:
  Trying to run 'ls' (or, anything else as far as I can tell) from a
  SunOS 5.8 box under RHEL 6.4 linux, I get a segfault.  I've tried
  qemu-1.5.3, qemu-1.6.0, and I fetched git://git.qemu-
  project.org/qemu.git.  I've also tried a statically linked sh from
  /sbin/ and it also segfaulted.

  wcolburn@anotheruvula/home/anotheruvula/qemu$ gdb bin/qemu-sparc
  GNU gdb (GDB) Red Hat Enterprise Linux (7.2-60.el6_4.1)
  Copyright (C) 2010 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-redhat-linux-gnu.
  For bug reporting instructions, please see:
  http://www.gnu.org/software/gdb/bugs/...
  Reading symbols from /home/anotheruvula/qemu/bin/qemu-sparc...done.
  (gdb) run ../sparc/ls
  Starting program: /home/anotheruvula/qemu/bin/qemu-sparc ../sparc/ls
  [Thread debugging using libthread_db enabled]

  Program received signal SIGSEGV, Segmentation fault.
  0x78259116 in static_code_gen_buffer ()
  Missing separate debuginfos, use: debuginfo-install glib2-2.22.5-7.el6.x86_64 
glibc-2.12-1.107.el6_4.4.x86_64
  (gdb) where
  #0  0x78259116 in static_code_gen_buffer ()
  #1  0x77f570cd in cpu_tb_exec (cpu=0x7a2b1210, tb_ptr=
  0x782590d0 A\213n \205í\017\205Í)
  at /home/anotheruvula/qemu-devel/cpu-exec.c:56
  #2  0x77f57b2d in cpu_sparc_exec (env=0x7a2b1348)
  at /home/anotheruvula/qemu-devel/cpu-exec.c:631
  #3  0x77f77f36 in cpu_loop (env=0x7a2b1348)
  at /home/anotheruvula/qemu-devel/linux-user/main.c:1089
  #4  0x77f798ff in main (argc=2, argv=0x7fffdfc8, envp=
  0x7fffdfe0) at /home/anotheruvula/qemu-devel/linux-user/main.c:4083
  (gdb)

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[Qemu-devel] [Bug 1221966] Re: SIGSEGV in static_code_gen_buffer

[William D Colburn]

And, in the grand scheme of things, I've been trying to piece together
what the problem software is that I need qemu for.  It turns out I've
got two very old sparcs both running Oracle with a variety of client
programs I need.  It could be that qemu-sparc is a waste of time and I
need to focus on qemu-system-sparc instead.

If you want to disappear this bug, go ahead.

-- 
You received this bug notification because you are a member of qemu-
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https://bugs.launchpad.net/bugs/1221966

Title:
  SIGSEGV in static_code_gen_buffer

Status in QEMU:
  New

Bug description:
  Trying to run 'ls' (or, anything else as far as I can tell) from a
  SunOS 5.8 box under RHEL 6.4 linux, I get a segfault.  I've tried
  qemu-1.5.3, qemu-1.6.0, and I fetched git://git.qemu-
  project.org/qemu.git.  I've also tried a statically linked sh from
  /sbin/ and it also segfaulted.

  wcolburn@anotheruvula/home/anotheruvula/qemu$ gdb bin/qemu-sparc
  GNU gdb (GDB) Red Hat Enterprise Linux (7.2-60.el6_4.1)
  Copyright (C) 2010 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-redhat-linux-gnu.
  For bug reporting instructions, please see:
  http://www.gnu.org/software/gdb/bugs/...
  Reading symbols from /home/anotheruvula/qemu/bin/qemu-sparc...done.
  (gdb) run ../sparc/ls
  Starting program: /home/anotheruvula/qemu/bin/qemu-sparc ../sparc/ls
  [Thread debugging using libthread_db enabled]

  Program received signal SIGSEGV, Segmentation fault.
  0x78259116 in static_code_gen_buffer ()
  Missing separate debuginfos, use: debuginfo-install glib2-2.22.5-7.el6.x86_64 
glibc-2.12-1.107.el6_4.4.x86_64
  (gdb) where
  #0  0x78259116 in static_code_gen_buffer ()
  #1  0x77f570cd in cpu_tb_exec (cpu=0x7a2b1210, tb_ptr=
  0x782590d0 A\213n \205í\017\205Í)
  at /home/anotheruvula/qemu-devel/cpu-exec.c:56
  #2  0x77f57b2d in cpu_sparc_exec (env=0x7a2b1348)
  at /home/anotheruvula/qemu-devel/cpu-exec.c:631
  #3  0x77f77f36 in cpu_loop (env=0x7a2b1348)
  at /home/anotheruvula/qemu-devel/linux-user/main.c:1089
  #4  0x77f798ff in main (argc=2, argv=0x7fffdfc8, envp=
  0x7fffdfe0) at /home/anotheruvula/qemu-devel/linux-user/main.c:4083
  (gdb)

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[Qemu-devel] [Bug 1221966] Re: SIGSEGV in static_code_gen_buffer

[Peter Maydell]

SIGSEGVs from qemu-linux-user are expected -- this is how we track self-
modifying code in the guest binary. We catch the SIGSEGV and handle it
appropriately. In particular, SPARC binaries do this a lot because their
dynamic-linking mechanism involves self-modifying code.

If you don't run the program under a debugger (or if you tell gdb to
pass SIGSEGV through to the target rather than stopping), what does it
do?

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https://bugs.launchpad.net/bugs/1221966

Title:
  SIGSEGV in static_code_gen_buffer

Status in QEMU:
  New

Bug description:
  Trying to run 'ls' (or, anything else as far as I can tell) from a
  SunOS 5.8 box under RHEL 6.4 linux, I get a segfault.  I've tried
  qemu-1.5.3, qemu-1.6.0, and I fetched git://git.qemu-
  project.org/qemu.git.  I've also tried a statically linked sh from
  /sbin/ and it also segfaulted.

  wcolburn@anotheruvula/home/anotheruvula/qemu$ gdb bin/qemu-sparc
  GNU gdb (GDB) Red Hat Enterprise Linux (7.2-60.el6_4.1)
  Copyright (C) 2010 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-redhat-linux-gnu.
  For bug reporting instructions, please see:
  http://www.gnu.org/software/gdb/bugs/...
  Reading symbols from /home/anotheruvula/qemu/bin/qemu-sparc...done.
  (gdb) run ../sparc/ls
  Starting program: /home/anotheruvula/qemu/bin/qemu-sparc ../sparc/ls
  [Thread debugging using libthread_db enabled]

  Program received signal SIGSEGV, Segmentation fault.
  0x78259116 in static_code_gen_buffer ()
  Missing separate debuginfos, use: debuginfo-install glib2-2.22.5-7.el6.x86_64 
glibc-2.12-1.107.el6_4.4.x86_64
  (gdb) where
  #0  0x78259116 in static_code_gen_buffer ()
  #1  0x77f570cd in cpu_tb_exec (cpu=0x7a2b1210, tb_ptr=
  0x782590d0 A\213n \205í\017\205Í)
  at /home/anotheruvula/qemu-devel/cpu-exec.c:56
  #2  0x77f57b2d in cpu_sparc_exec (env=0x7a2b1348)
  at /home/anotheruvula/qemu-devel/cpu-exec.c:631
  #3  0x77f77f36 in cpu_loop (env=0x7a2b1348)
  at /home/anotheruvula/qemu-devel/linux-user/main.c:1089
  #4  0x77f798ff in main (argc=2, argv=0x7fffdfc8, envp=
  0x7fffdfe0) at /home/anotheruvula/qemu-devel/linux-user/main.c:4083
  (gdb)

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