I have checked the CVS source and found this Changelog below.
Does this fix my GFS crashes with NFS? It describes my kind of
problems.
Thanks
====== Changelog
CVSROOT: /cvs/cluster
Module name: cluster
Branch: STABLE
Changes by: bmarzins@xxxxxxxxxxxxxx 2006-03-08 20:47:09
Modified files:
gfs-kernel/src/gfs: ops_inode.c
Log message:
Really gross hack!!!
This is a workaround for one of the bugs the got lumped into 166701. It
Breaks POSIX behavior in a corner case to avoid crashing... It's icky.
when NFS opens a file with O_CREAT, the kernel nfs daemon checks to see
if the file exists. If it does, nfsd does the *right thing* (either
opens the file, or if the file was opened with O_EXCL, returns an
error). If the file doesn't exist, it passes the request down to the
underlying file system. Unfortunately, since nfs *knows* that the file
doesn't exist, it doesn't bother to pass a nameidata structure, which
would include the intent information. However since gfs is a cluster
file system, the file could have been created on another node after nfs
checks for it. If this is the case, gfs needs the intent information to
do the *right thing*. It panics when it finds a NULL pointer, instead
of the nameidata. Now, instead of panicing, if gfs finds a NULL
nameidata pointer. It assumes that the file was not created with
O_EXCL.
This assumption could be wrong, with the result that an application
could thing that it has created a new file, when in fact, it has opened
an existing one.
=== End Changelog ===
Bas van der Vlies wrote:
We just upgraded to 2.6.16-rc5 and cvs stable gfs. We still have
gfs_create crashes.
=== Ooops =====
Unable to handle kernel NULL pointer dereference at virtual address
00000038
printing eip:
f89a4be3
*pde = 37809001
*pte = 00000000
Oops: 0000 [#1]
SMP
Modules linked in: lock_dlm dlm cman dm_round_robin dm_multipath sg
ide_floppy ide_cd cdrom qla2xxx siimage piix e1000 gfs lock_harness dm_mod
CPU: 0
EIP: 0060:[<f89a4be3>] Tainted: GF VLI
EFLAGS: 00010246 (2.6.16-rc5-sara3 #1)
EIP is at gfs_create+0x6f/0x153 [gfs]
eax: 00000000 ebx: ffffffef ecx: f27d0d98 edx: ffffffef
esi: f2f84690 edi: f8b93000 ebp: f34a5e98 esp: f34a5e20
ds: 007b es: 007b ss: 0068
Process nfsd (pid: 8973, threadinfo=f34a4000 task=f3462a70)
Stack: <0>f092a530 00000001 f34a5e48 00000000 f34a5e84 f89a6628 f34a5e48
ee1fc324
00000003 00000000 f34a5e48 f34a5e48 00000000 f3462a70 00000003
f34a5e5c
f34a5e5c f27d0d98 f3462a70 00000001 00000020 00000000 000000c2
00000000
Call Trace:
[<c0103599>] show_stack_log_lvl+0xad/0xb5
[<c01036db>] show_registers+0x10d/0x176
[<c01038ad>] die+0xf2/0x16d
[<c010f668>] do_page_fault+0x3dd/0x57a
[<c010322f>] error_code+0x4f/0x54
[<c01585f2>] vfs_create+0x6a/0xa7
[<c0195e1c>] nfsd_create_v3+0x2b1/0x48a
[<c019af2f>] nfsd3_proc_create+0x116/0x123
[<c019229f>] nfsd_dispatch+0xbe/0x17f
[<c02e0a52>] svc_process+0x381/0x5c7
[<c019208c>] nfsd+0x18d/0x2e2
[<c0100ed9>] kernel_thread_helper+0x5/0xb
Code: 94 50 8b 45 0c ff 75 10 83 c0 1c 6a 01 89 45 88 50 8d 45 c4 50 e8
70 08 ff ff 83 c4 14 89 c3 85 c0 74 4883 f8 ef 75 33 8b 45 14 <80> 78 38
00 78 2a 8d 45 94 50 8d 45 c4 6a 00 ff 75 88 50 e8 3c
BUG: nfsd/8973, lock held at task exit time!
[ee1fc398] {inode_init_once}
.. held by: nfsd: 8973 [f3462a70, 115]
... acquired at: nfsd_create_v3+0x127/0x48a
--
--
********************************************************************
* *
* Bas van der Vlies e-mail: basv@xxxxxxx *
* SARA - Academic Computing Services phone: +31 20 592 8012 *
* Kruislaan 415 fax: +31 20 6683167 *
* 1098 SJ Amsterdam *
* *
********************************************************************
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