From: Vince Busam <vbusam@google.com>
Subject: Re: [PATCH] Fix typo on __rpc_purge_upcall
Date: Thu, 05 Jan 2006 14:30:25 -0800
Message-ID: <43BD9E01.9040804@google.com>
References: <4382252E.4000602@google.com>	 <1132602917.8011.2.camel@lade.trondhjem.org> <43824151.5060604@google.com>	 <1132612440.8011.7.camel@lade.trondhjem.org> <4382515C.9020200@google.com>	 <1132614431.8011.14.camel@lade.trondhjem.org> <438B4983.3030809@google.com>	 <1133203961.27574.66.camel@lade.trondhjem.org>	 <4394AB2E.1030809@google.com>  <439DC809.3020502@google.com>	 <1134415137.7877.10.camel@lade.trondhjem.org> <439DDE7D.3050904@google.com> <1134431510.8028.26.camel@lade.trondhjem.org>
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To: Trond Myklebust <trond.myklebust@fys.uio.no>
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Trond Myklebust wrote:
> On Mon, 2005-12-12 at 12:33 -0800, Vince Busam wrote:
> 
>>Trond Myklebust wrote:
>>
>>>Could you send us the contents of rpc_close_pipes() and
>>>rpc_pipe_release()?
>>>
> 
> 
> Hmm.... Looks correct. The only potential races I can see should be
> fixed by the following patch. Can you apply and then try again?
> 

I'm still got an oops after applying that patch (it still takes a long time for it to 
occur, this happened over the break with expired credentials).

Dec 24 01:07:43 block kernel: RPC: AUTH_GSS upcall timed out.
Dec 24 01:07:43 block kernel: Please check user daemon is running!
Dec 24 01:07:45 block kernel: Unable to handle kernel NULL pointer dereference at virtual 
address 00000004
Dec 24 01:07:45 block kernel: printing eip:
Dec 24 01:07:45 block kernel: f8ad1d4b
Dec 24 01:07:45 block kernel: *pde = 00000000
Dec 24 01:07:45 block kernel: Oops: 0002 [#1]
Dec 24 01:07:45 block kernel: PREEMPT SMP
Dec 24 01:07:45 block kernel: Modules linked in: des binfmt_misc cpufreq_userspace 
cpufreq_ondemand cpufreq_powersave autofs4 video button battery container ac
capability commoncap nfs lockd af_packet tg3 generic piix snd_intel8x0 snd_ac97_codec 
snd_usb_audio snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd_page_alloc snd_usb_lib 
snd_rawmidi snd_seq_device snd_hwdep snd soundcore pwc videodev v4l2_common uhci_hcd 
pci_hotplug floppy pcspkr rtc tsdev evdev usbhid md_mod dm_mod nvidia agpgart psmouse 
mousedev parport_pc lp parport ide_generic ide_disk ide_cd cdrom rpcsec_gss_krb5 
auth_rpcgss sunrpc ehci_hcd ext3 jbd mbcache ahci sd_mod
ata_piix libata usb_storage usbcore scsi_mod ide_core unix thermal processor fanDec 24 
01:07:45 block kernel: CPU:    1
Dec 24 01:07:45 block kernel: EIP:    0060:[<f8ad1d4b>]    Tainted: P      VLI
Dec 24 01:07:45 block kernel: EFLAGS: 00010286   (2.6.13.4-gg5vb9)
Dec 24 01:07:45 block kernel: EIP is at __rpc_purge_list+0x2b/0xc0 [sunrpc]
Dec 24 01:07:45 block kernel: eax: 00000000   ebx: c877de88   ecx: c877dea0   edx: 00000000
Dec 24 01:07:45 block kernel: esi: ec69e684   edi: f890ece0   ebp: ffffffe0   esp: ebd4ff14
Dec 24 01:07:45 block kernel: ds: 007b   es: 007b   ss: 0068
Dec 24 01:07:45 block kernel: Process rpc.gssd (pid: 7410, threadinfo=ebd4e000 task=ec48c540)
Dec 24 01:07:45 block kernel: Stack: c877de80 00000002 d646d440 ec69e500 ffffffe0 ec68fa00 
ec69e500 f8ad1e15
Dec 24 01:07:45 block kernel: ec69e500 ec69e684 ffffffe0 ec69e500 e584bc80 f8ad21be 
ec69e500 ffffffe0
Dec 24 01:07:45 block kernel: 00000008 e584bc80 c01675fa ec69e500 e584bc80 00000000 
00000000 ebe667a0
Dec 24 01:07:45 block kernel: Call Trace:
Dec 24 01:07:45 block kernel: [<f8ad1e15>] __rpc_purge_upcall+0x35/0xb0 [sunrpc]Dec 24 
01:07:45 block kernel: [<f8ad21be>] rpc_pipe_release+0xae/0xd0 [sunrpc]
Dec 24 01:07:45 block kernel: [<c01675fa>] __fput+0x18a/0x1d0
Dec 24 01:07:45 block kernel: [<c0165906>] filp_close+0x46/0x90
Dec 24 01:07:45 block kernel: [<c01659ba>] sys_close+0x6a/0xa0
Dec 24 01:07:45 block kernel: [<c010316b>] sysenter_past_esp+0x54/0x75
Dec 24 01:07:45 block kernel: Code: 55 57 56 53 83 ec 0c 8b 5c 24 20 8b 74 24 24 8b 6c 24 
28 85 db 74 78 85 f6 74 54 8b 83 b4 01 00 00 8b 78 0c eb 17 8b 53 04 8b 03 <89> 50 04 89 
02 89 5b 04 89 1b 89 6b 14 89 1c 24 ff d7 8b 1e 39

After dissassembling the code, it appears this is happening in list_del_init(&msg->list) 
in __rpc_purge_list(), in the first line of the inlined function __list_del().

Vince


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