Hi.

This isn't a test of the proposed patch. I just got another variatioin 
of the problem in the log. (I've tried running the automount daemon both 
with and without the --ghost option) that is the only change I can see. 
Still 2.6.26-rc4..

Jun  5 16:13:15 node37 kernel: [17388710.169561] BUG: unable to handle 
kernel NULL pointer dereference at 00000000000000b2
Jun  5 16:13:15 node37 automount[28691]: mount(nfs): nfs: mount failure 
hest.nzcorp.net:/z/fx1200 on /nfs/fx1200
Jun  5 16:13:15 node37 automount[28691]: failed to mount /nfs/fx1200
Jun  5 16:13:15 node37 kernel: [17388710.217273] IP: [graft_tree+77/288] 
graft_tree+0x4d/0x120
Jun  5 16:13:15 node37 kernel: [17388710.217273] PGD f9e75067 PUD 
f681e067 PMD 0
Jun  5 16:13:15 node37 kernel: [17388710.217273] Oops: 0000 [1] SMP
Jun  5 16:13:15 node37 kernel: [17388710.217273] CPU 1
Jun  5 16:13:15 node37 kernel: [17388710.217273] Modules linked in: nfs 
lockd sunrpc autofs4 ipv6 af_packet usbhid hid uhci_hcd ehci_hcd usbkbd 
fuse parport_pc lp parport i2c_amd756 serio_raw psmouse pcspkr container 
i2c_core shpchp k8temp button amd_rng evdev pci_hotplug ext3 jbd mbcache 
sg sd_mod ide_cd_mod cdrom floppy mptspi mptscsih mptbase 
scsi_transport_spi ohci_hcd tg3 usbcore amd74xx ide_core ata_generic 
libata scsi_mod dock thermal processor fan thermal_sys
Jun  5 16:13:15 node37 kernel: [17388710.217273] Pid: 28693, comm: 
mount.nfs Not tainted 2.6.26-rc4 #1
Jun  5 16:13:15 node37 kernel: [17388710.993688] RIP: 
0010:[graft_tree+77/288]  [graft_tree+77/288] graft_tree+0x4d/0x120
Jun  5 16:13:15 node37 kernel: [17388710.993688] RSP: 
0000:ffff8100f9c85e08  EFLAGS: 00010246
Jun  5 16:13:15 node37 kernel: [17388710.993688] RAX: ffff8100bfbc0270 
RBX: 00000000ffffffec RCX: 0000000000000000
Jun  5 16:13:15 node37 kernel: [17388711.245666] RDX: ffff8100f9ec5900 
RSI: ffff8100f9c85e68 RDI: ffff8100bae1f800
Jun  5 16:13:15 node37 kernel: [17388711.245666] RBP: ffff8100bae1f800 
R08: 0000000000000000 R09: 0000000000000001
Jun  5 16:13:15 node37 kernel: [17388711.245666] R10: 0000000000000001 
R11: ffffffff803011c0 R12: ffff8100f9c85e68
Jun  5 16:13:15 node37 kernel: [17388711.513641] R13: 0000000000000000 
R14: 000000000000000b R15: 000000000000000b
Jun  5 16:13:15 node37 kernel: [17388711.513641] FS: 
00007fd02f2cf6e0(0000) GS:ffff8100fbb0e280(0000) knlGS:00000000557fc6b0
Jun  5 16:13:15 node37 kernel: [17388711.701623] CS:  0010 DS: 0000 ES: 
0000 CR0: 000000008005003b
Jun  5 16:13:15 node37 kernel: [17388711.701623] CR2: 00000000000000b2 
CR3: 00000000f9f49000 CR4: 00000000000006e0
Jun  5 16:13:15 node37 kernel: [17388711.701623] DR0: 0000000000000000 
DR1: 0000000000000000 DR2: 0000000000000000
Jun  5 16:13:15 node37 kernel: [17388711.701623] DR3: 0000000000000000 
DR6: 00000000ffff0ff0 DR7: 0000000000000400
Jun  5 16:13:15 node37 kernel: [17388711.701623] Process mount.nfs (pid: 
28693, threadinfo ffff8100f9c84000, task ffff8100f6815640)
Jun  5 16:13:15 node37 kernel: [17388712.145575] Stack: 
ffff8100f9c85e68 ffff8100f9c85e70 ffff8100bae1f800 ffffffff802b2622
Jun  5 16:13:15 node37 kernel: [17388712.145575]  0000000000000006 
0000000000000000 ffff8100f695f000 ffff8100f695e000
Jun  5 16:13:15 node37 kernel: [17388712.145575]  ffff8100f695d000 
ffffffff802b49e9 000000004847f4ef 0000000000000000
Jun  5 16:13:15 node37 kernel: [17388712.145575] Call Trace:
Jun  5 16:13:15 node37 kernel: [17388712.145575]  [do_add_mount+162/320] 
? do_add_mount+0xa2/0x140
Jun  5 16:13:15 node37 kernel: [17388712.145575]  [do_mount+505/592] ? 
do_mount+0x1f9/0x250
Jun  5 16:13:15 node37 kernel: [17388712.145575] 
[copy_mount_options+269/384] ? copy_mount_options+0x10d/0x180
Jun  5 16:13:15 node37 kernel: [17388712.145575]  [sys_mount+155/256] ? 
sys_mount+0x9b/0x100
Jun  5 16:13:15 node37 kernel: [17388712.145575] 
[system_call_after_swapgs+123/128] ? system_call_after_swapgs+0x7b/0x80
Jun  5 16:13:15 node37 kernel: [17388712.145575]
Jun  5 16:13:15 node37 kernel: [17388712.145575]
Jun  5 16:13:15 node37 kernel: [17388712.145575] Code: f7 40 58 00 00 00 
80 74 15 89 d8 48 8b 6c 24 08 48 8b 1c 24 4c 8b 64 24 10 48 83 c4 18 c3 
48 8b 46 08 bb ec ff ff ff 48 8b 48 10 <0f> b7 81 b2 00 00 00 25 00 f0 
00 00 3d 00 40 00 00 48 8b 47 20
Jun  5 16:13:15 node37 kernel: [17388712.145575] RIP 
[graft_tree+77/288] graft_tree+0x4d/0x120
Jun  5 16:13:15 node37 kernel: [17388712.145575]  RSP <ffff8100f9c85e08>
Jun  5 16:13:15 node37 kernel: [17388712.145575] CR2: 00000000000000b2
Jun  5 16:13:15 node37 kernel: [17388715.129847] ---[ end trace 
f3c4579f529c23bf ]---

I'll apply the patch today and get some nodes booted up on it.

-- 
Jesper
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