Re: [Crash-utility] [PATCH] add a new command: ipcs
----- Original Message -----
Hello Dave,
I have modified the output of ipcs, please see the attachment. About the
bugs of SLES, I tried to install a SLES9(2.6.5-7.97-smp) to locate the
problems. But I failed to get debuginfo. I will continue searching it.
It will be helpful, if you have some information about it.
I believe that SLES9 kernels containing debuginfo data are built *after* the
original distribution's non-debuginfo kernels are built. Therefore, they may
have slight differences in their symbol values, so the correct System.map file
needs to be added to the crash command line.
I only have one sample SLES9 kernel (which I believe was modified by a 3rd party),
and it is invoked like this:
$ crash vmlinux-2.6.5-7.315-smp.debug System.map-2.6.5-7.315-smp ap17.1234028168.dmp
So as I understand it:
(1) the original kernel was vmlinux-2.6.5-7.315-smp
(2) the vmlinux-2.6.5-7.315-smp.debug kernel was built later
(3) the original System.map-2.6.5-7.315-smp file is required to deal with symbol
value differences between the two kernels.
I presume that what you need is a "vmlinux-2.6.5-7.97-smp.debug" kernel. But I
don't know where they can be found -- even google cannot find one.
Perhaps you can download the 2.6.5-era kernel sources and check them against
your support for the RHEL4 2.6.9-era sources? It's probably something fairly
minor.
As far as this version of ipcs.c goes, the only issues I have are display problems.
For some reason, if none of the facilities are being used, I see this output
on RHEL4 and RHEL5 kernels:
crash> ipcs
SHMID_KERNEL KEY SHMID UID PERMS BYTES NATTCH STATUS
(none allocated)SEM_ARRAY KEY SEMID UID PERMS NSEMS
(none allocated)MSG_QUEUE KEY MSQID UID PERMS USED-BYTES MESSAGES
(none allocated)
crash> ipcs -mqs
SHMID_KERNEL KEY SHMID UID PERMS BYTES NATTCH STATUS
(none allocated)SEM_ARRAY KEY SEMID UID PERMS NSEMS
(none allocated)MSG_QUEUE KEY MSQID UID PERMS USED-BYTES MESSAGES
(none allocated)
crash>
On kernels that are later than 2.6.18, the output is correct, for example on
this 2.6.24 kernel:
crash> ipcs
SHMID_KERNEL KEY SHMID UID PERMS BYTES NATTCH STATUS
(none allocated)
SEM_ARRAY KEY SEMID UID PERMS NSEMS
(none allocated)
MSG_QUEUE KEY MSQID UID PERMS USED-BYTES MESSAGES
(none allocated)
crash>
And on all kernels, the SHMID_KERNEL header is missing from "ipcs -M" if no
shared
memory is used:
crash> ipcs -M
(none allocated)
crash>
Lastly, the help page data needs work:
(1) It still shows the output with the "------ Shared Memory Segments ------",
etc., strings.
(2) It still shows the "0x" in the KEY values.
(3) The "ipcs -M" example shows error output. None of the crash help page
examples
show a command being used incorrectly, so please just show it working correctly:
display specified resources in detail with an address
crash> ipcs -M 1 ffff880473a28250 2
invalid id or address: 1
invalid id or address: 2
SHMID_KERNEL KEY SHMID UID PERMS BYTES NATTCH STATUS
ffff880473a28250 00000002 65538 0 666 90000 1
PAGES ALLOCATED: 96 RESIDENT: 22 SWAPPED: 0
SWAP PERFORMANCE ATTEMPTS: 0 SUCCESSES: 0
VFS_INODE: ffff880470503758
Thanks,
Dave