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  1. 02 11月, 2011 14 次提交
  3. 15 9月, 2011 3 次提交
  5. 26 7月, 2011 4 次提交
  7. 21 7月, 2011 1 次提交
  9. 23 3月, 2011 1 次提交
    • P
      uml: kernels on {i386,x86_64} produce bad coredumps · 13e165ba
      由 Paul Pluzhnikov 提交于 
      One of our users reported that when a user-level program SIGSEGVs under
UML kernel, the resulting core dump is not very usable.

I have reproduced that with the latest kernel:

  make ARCH=um defconfig; make ARCH=um

Run the resulting kernel, then "inside" run this program:

#include <pthread.h>

void *fn(void *p)
{
 abort();
}

int main()
{
 pthread_t tid;
 pthread_create(&tid, 0, fn, 0);
 pthread_join(tid, 0);
 return 0;
}

Analyze the coredump with GDB. Here is what you'll see:

sudo gdb -q -ex 'set solib-absolute-prefix ../root_fs' -ex 'file ../root_fs/var/tmp/mt-abort' -ex 'core ../root_fs/var/tmp/core.762'
Reading symbols from /usr/local/google/root_fs/var/tmp/mt-abort...done.
[New Thread 763]
[New Thread 762]
Core was generated by `./mt-abort'.
Program terminated with signal 6, Aborted.
#0  0x0000000040255250 in raise () from ../root_fs/lib64/libc.so.6
(gdb) info thread
  2 Thread 762  0x0000000000000000 in ?? ()
* 1 Thread 763  0x0000000040255250 in raise () from ../root_fs/lib64/libc.so.6

Note that thread#2 looks funny.

(gdb) thread 2
[Switching to thread 2 (Thread 762)]#0  0x0000000000000000 in ?? ()
(gdb) info reg
rax            0x0      0
rbx            0x0      0
rcx            0x0      0
rdx            0x0      0
rsi            0x0      0
rdi            0x0      0
rbp            0x0      0x0
rsp            0x0      0x0
r8             0x0      0
r9             0x0      0
r10            0x0      0
r11            0x0      0
r12            0x0      0
r13            0x0      0
r14            0x0      0
r15            0x0      0
rip            0x0      0
eflags         0x0      [ ]
cs             0x0      0
ss             0x0      0
ds             0x0      0
es             0x0      0
fs             0x0      0
gs             0x0      0

Examining the core shows that NT_PRSTATUS notes for all threads other than
the one that crashed are zeroed out.

I believe this is happening because neither ELF_CORE_COPY_TASK_REGS nor
task_pt_regs are defined under ARCH=um, and so elf_core_copy_task_regs()
becomes a no-op.

Attached patch fixes this for SUBARCH={x86_64,i386}.
Signed-off-by: NPaul Pluzhnikov <ppluzhnikov@google.com>
Cc: Jeff Dike <jdike@addtoit.com>
Acked-by: NWANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      13e165ba
  11. 28 10月, 2010 2 次提交
  13. 21 4月, 2010 1 次提交
    • J
      UML: Fix compiler warning due to missing task_struct declaration · 4cb3ca7c
      由 Jan Kiszka 提交于 
      We can't pull in linux/sched.h due to circular dependency, so just
forward-declare the struct.

This fixes the following warning:

  CC      arch/um/sys-i386/elfcore.o
In file included from /data/linux-2.6/include/linux/elf.h:8,
                 from /data/linux-2.6/arch/um/sys-i386/elfcore.c:2:
arch/um/sys-i386/asm/elf.h:78: warning: ‘struct task_struct’ declared inside parameter list
arch/um/sys-i386/asm/elf.h:78: warning: its scope is only this definition or declaration, which is probably not what you want

I guess not many people build against i386 hosts anymore, so this
remained widely unnoticed.
Signed-off-by: NJan Kiszka <jan.kiszka@web.de>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>
      4cb3ca7c
  15. 20 4月, 2010 2 次提交
  17. 13 3月, 2010 1 次提交
    • C
      improve sys_newuname() for compat architectures · e28cbf22
      由 Christoph Hellwig 提交于 
      On an architecture that supports 32-bit compat we need to override the
reported machine in uname with the 32-bit value.  Instead of doing this
separately in every architecture introduce a COMPAT_UTS_MACHINE define in
<asm/compat.h> and apply it directly in sys_newuname().
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: James Morris <jmorris@namei.org>
Cc: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      e28cbf22
  19. 18 1月, 2010 1 次提交
    • L
      x86: Fix breakage of UML from the changes in the rwsem system · 4126faf0
      由 Linus Torvalds 提交于 
      The patches 5d0b7235 and
bafaecd1 broke the UML build:

On Sun, 17 Jan 2010, Ingo Molnar wrote:
>
> FYI, -tip testing found that these changes break the UML build:
>
> kernel/built-in.o: In function `__up_read':
> /home/mingo/tip/arch/x86/include/asm/rwsem.h:192: undefined reference to `call_rwsem_wake'
> kernel/built-in.o: In function `__up_write':
> /home/mingo/tip/arch/x86/include/asm/rwsem.h:210: undefined reference to `call_rwsem_wake'
> kernel/built-in.o: In function `__downgrade_write':
> /home/mingo/tip/arch/x86/include/asm/rwsem.h:228: undefined reference to `call_rwsem_downgrade_wake'
> kernel/built-in.o: In function `__down_read':
> /home/mingo/tip/arch/x86/include/asm/rwsem.h:112: undefined reference to `call_rwsem_down_read_failed'
> kernel/built-in.o: In function `__down_write_nested':
> /home/mingo/tip/arch/x86/include/asm/rwsem.h:154: undefined reference to `call_rwsem_down_write_failed'
> collect2: ld returned 1 exit status

Add lib/rwsem_64.o to the UML subarch objects to fix.

LKML-Reference: <alpine.LFD.2.00.1001171023440.13231@localhost.localdomain>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
      4126faf0
  21. 16 12月, 2009 1 次提交
  23. 17 6月, 2009 2 次提交
  25. 12 6月, 2009 1 次提交
  27. 01 4月, 2009 1 次提交
  29. 23 10月, 2008 5 次提交