10 p.m.
Hi,
I'd like to find help here that does anyone have tried to get the
crash utility support the userspace stack dumping, or it already be
supported?
Certainly userspace crash would not cause kernel panic, but for more
robust product, we force kernel panic and trigger the kdump at every
userspace crash.
So the support for dumping user stack is import to us.
Anyone has some idea to this feature?
If we could get the stack like stack dump from userspace to kernel
space with parameter showing, then that is perfect.
Example:
-010|do_vfs_ioctl(filp = 0xCE575500, ?, ?, arg = 1181448720)
-011|sys_ioctl(fd = 27, cmd = 30000, arg = 1181448720)
-012|ret_fast_syscall(asm)
-->|exception
-013|__ioctl(asm)
-014|ioctl(?, request = 0)
Thanks,
Lei
7:56 a.m.
New subject: Is there any support for userspace stack dump for crash utility?
----- Original Message -----
Hi,
I'd like to find help here that does anyone have tried to get the
crash utility support the userspace stack dumping, or it already be
supported?
Certainly userspace crash would not cause kernel panic, but for more
robust product, we force kernel panic and trigger the kdump at every
userspace crash.
So the support for dumping user stack is import to us.
Anyone has some idea to this feature?
If we could get the stack like stack dump from userspace to kernel
space with parameter showing, then that is perfect.
Example:
-010|do_vfs_ioctl(filp = 0xCE575500, ?, ?, arg = 1181448720)
-011|sys_ioctl(fd = 27, cmd = 30000, arg = 1181448720)
-012|ret_fast_syscall(asm)
-->|exception
-013|__ioctl(asm)
-014|ioctl(?, request = 0)
Thanks,
Lei
There's no chance that the base crash utility will ever do that.
However, in your case, you might try the "gcore" extension
module. See its description, and download it from:
http://people.redhat.com/anderson/extensions
It's help page (accessible from the page above):
http://people.redhat.com/anderson/extensions/gcore_help_gcore.html
After you have gathered the vmcore, run the crash utility
on it, and use the "extend" command to load the "gcore"
command. Then use the "gcore" command to generate a user core
dump file:
crash> extend gcore.so
gcore.so: shared object loaded
crash> gcore <pid>
Saved core.<pid>
crash>
which will generate a core dump of that <pid>'s task.
Then you can run "gdb <command> core-<pid>". If it
works as advertised, then you should be able to get
a backtrace up until the point it entered the kernel.
Dave
7:58 a.m.
New subject: Is there any support for userspace stack dump for crash utility?
----- Original Message -----
However, in your case, you might try the "gcore" extension
module. See its description, and download it from:
http://people.redhat.com/anderson/extensions
Correction: http://people.redhat.com/anderson/extensions.html
8:34 a.m.
Hi Dave,
On Wed, Feb 1, 2012 at 9:58 PM, Dave Anderson <anderson(a)redhat.com> wrote:
----- Original Message -----
> However, in your case, you might try the "gcore" extension
> module. See its description, and download it from:
>
> http://people.redhat.com/anderson/extensions
Correction: http://people.redhat.com/anderson/extensions.html
--
Thanks a lot for your info. Seems this extension could meet my need.
Curiously why this great tool didn't put into release package?
Thanks,
Lei
1:48 p.m.
----- Original Message -----
Hi Dave,
On Wed, Feb 1, 2012 at 9:58 PM, Dave Anderson <anderson(a)redhat.com>
wrote:
>
>
> ----- Original Message -----
>
>> However, in your case, you might try the "gcore" extension
>> module. See its description, and download it from:
>>
>> http://people.redhat.com/anderson/extensions
>
> Correction: http://people.redhat.com/anderson/extensions.html
>
> --
Thanks a lot for your info. Seems this extension could meet my need.
Curiously why this great tool didn't put into release package?
Thanks,
Lei
Actually it is scheduled to be introduced in RHEL6.3, and requested
for RHEL7.0. In those releases, it will be a discrete crash extension
module package.
Dave
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