[nfsv4] [PATCH 0/7] Permit filesystem local caching and NFS superblock sharing [try #13]

[Trond Myklebust]

On Fri, 2006-09-01 at 16:32 -0700, Bryce Harrington wrote:
> Last night we re-ran the test, and it did Oops again, in a similar
> manner, but this time when running newpynfs with AUTHSYS: 
> 
>    http://crucible.osdl.org/runs/1750/sysinfo/nfs06.console
> 
> BUG: unable to handle kernel paging request at virtual address 6b6b6b73
> printing eip:
> c040f26d
> *pde = 00000000
> Oops: 0000 [#1]
> PREEMPT SMP 
> Modules linked in:
> CPU:    0
> EIP:    0060:[<c040f26d>]    Not tainted VLI
> EFLAGS: 00010246   (2.6.18-rc5-gd4a4640-nfs-client-stable #1) 
> EIP is at pmap_getport_done+0x17/0xae
> eax: 6b6b6b6b   ebx: dfc56370   ecx: 00000000   edx: dfc56370
> esi: dfc562b0   edi: 00000000   ebp: f7aa2f04   esp: f7aa2ef8
> ds: 007b   es: 007b   ss: 0068
> Process rpciod/0 (pid: 7635, ti=f7aa2000 task=f7421550 task.ti=f7aa2000)
> Stack: dfc56370 dfc563d8 00000000 f7aa2f18 c040a23f dfc56370 dfc4aa34
> dfc56370 
> f7aa2f30 c040a2f7 dfc56370 dfc563e0 dfc563e4 f6b07d24 f7aa2f3c c040a440 
> dfc56370 f7aa2f60 c012b398 dfc56370 dfc56370 c040a435 00000213 f6b07d24 
> Call Trace:
> [<c01037da>] show_stack_log_lvl+0x8a/0x92
> [<c010393b>] show_registers+0x11d/0x186
> [<c0103b27>] die+0x10c/0x1c2
> [<c0113f31>] do_page_fault+0x3e0/0x4bc
> [<c01034ad>] error_code+0x39/0x40
> [<c040a23f>] rpc_exit_task+0x1e/0x59
> [<c040a2f7>] __rpc_execute+0x7d/0x19c
> [<c040a440>] rpc_async_schedule+0xb/0xd
> [<c012b398>] run_workqueue+0x85/0xc7
> [<c012b4d7>] worker_thread+0xfd/0x131
> [<c012e3d2>] kthread+0x84/0xad
> [<c0100f19>] kernel_thread_helper+0x5/0xb
> Code: 05 c0 00 00 00 50 e8 d8 ae ff ff 5a 8d 65 f4 5b 5e 5f 5d c3 55 89
> e5 57 56 8b 45 0c 8b 55 08 53 8b 70 10 8b 7a 18 8b 46 10 85 ff <8b> 58
> 08 79 0d 8b 03 6a 00 53 ff 50 14 89 7e 18 eb 1b 8b 55 0c 
> EIP: [<c040f26d>] pmap_getport_done+0x17/0xae SS:ESP 0068:f7aa2ef8

Yep. The portmapper code really should not assume that the task that
spawned it will still be around when it finishes. I should have a patch
for that by tomorrow.

Cheers,
  Trond