linux-kernel - Re: [PATCH] [38/223] SUNRPC: After calling xprt_release(), we must restart from call

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Date:	Mon, 13 Dec 2010 18:01:34 -0500
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	gregkh@...e.de, ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	stable@...nel.org
Subject: Re: [PATCH] [38/223] SUNRPC: After calling xprt_release(), we must
 restart from call_reserve

On Mon, 2010-12-13 at 00:45 +0100, Andi Kleen wrote:
> 2.6.35-longterm review patch.  If anyone has any objections, please let me know.

Hi Andi,

This patch isn't strictly needed for kernels 2.6.35.x or older: the Oops
only appears in 2.6.36.

Cheers
  Trond

> ------------------
> From: Trond Myklebust <Trond.Myklebust@...app.com>
> 
> commit 118df3d17f11733b294ea2cd988d56ee376ef9fd upstream.
> 
> Rob Leslie reports seeing the following Oops after his Kerberos session
> expired.
> 
> BUG: unable to handle kernel NULL pointer dereference at 00000058
> IP: [<e186ed94>] rpcauth_refreshcred+0x11/0x12c [sunrpc]
> *pde = 00000000
> Oops: 0000 [#1]
> last sysfs file: /sys/devices/platform/pc87360.26144/temp3_input
> Modules linked in: autofs4 authenc esp4 xfrm4_mode_transport ipt_LOG ipt_REJECT xt_limit xt_state ipt_REDIRECT xt_owner xt_HL xt_hl xt_tcpudp xt_mark cls_u32 cls_tcindex sch_sfq sch_htb sch_dsmark geodewdt deflate ctr twofish_generic twofish_i586 twofish_common camellia serpent blowfish cast5 cbc xcbc rmd160 sha512_generic sha1_generic hmac crypto_null af_key rpcsec_gss_krb5 nfsd exportfs nfs lockd fscache nfs_acl auth_rpcgss sunrpc ip_gre sit tunnel4 dummy ext3 jbd nf_nat_irc nf_conntrack_irc nf_nat_ftp nf_conntrack_ftp iptable_mangle iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 iptable_filter ip_tables x_tables pc8736x_gpio nsc_gpio pc87360 hwmon_vid loop aes_i586 aes_generic sha256_generic dm_crypt cs5535_gpio serio_raw cs5535_mfgpt hifn_795x des_generic geode_rng rng_core led_class ext4 mbcache jbd2 crc16 dm_mirror dm_region_hash dm_log dm_snapshot dm_mod sd_mod crc_t10dif ide_pci_generic cs5536 amd74xx ide_core pata_cs5536 ata_generic libata usb_stora
>  ge via_rhine mii scsi_mod btrfs zlib_deflate crc32c libcrc32c [last unloaded: scsi_wait_scan]
> 
> Pid: 12875, comm: sudo Not tainted 2.6.36-net5501 #1 /
> EIP: 0060:[<e186ed94>] EFLAGS: 00010292 CPU: 0
> EIP is at rpcauth_refreshcred+0x11/0x12c [sunrpc]
> EAX: 00000000 EBX: defb13a0 ECX: 00000006 EDX: e18683b8
> ESI: defb13a0 EDI: 00000000 EBP: 00000000 ESP: de571d58
>  DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
> Process sudo (pid: 12875, ti=de570000 task=decd1430 task.ti=de570000)
> Stack:
>  e186e008 00000000 defb13a0 0000000d deda6000 e1868f22 e196f12b defb13a0
> <0> defb13d8 00000000 00000000 e186e0aa 00000000 defb13a0 de571dac 00000000
> <0> e186956c de571e34 debea5c0 de571dc8 e186967a 00000000 debea5c0 de571e34
> Call Trace:
>  [<e186e008>] ? rpc_wake_up_next+0x114/0x11b [sunrpc]
>  [<e1868f22>] ? call_decode+0x24a/0x5af [sunrpc]
>  [<e196f12b>] ? nfs4_xdr_dec_access+0x0/0xa2 [nfs]
>  [<e186e0aa>] ? __rpc_execute+0x62/0x17b [sunrpc]
>  [<e186956c>] ? rpc_run_task+0x91/0x97 [sunrpc]
>  [<e186967a>] ? rpc_call_sync+0x40/0x5b [sunrpc]
>  [<e1969ca2>] ? nfs4_proc_access+0x10a/0x176 [nfs]
>  [<e19572fa>] ? nfs_do_access+0x2b1/0x2c0 [nfs]
>  [<e186ed61>] ? rpcauth_lookupcred+0x62/0x84 [sunrpc]
>  [<e19573b6>] ? nfs_permission+0xad/0x13b [nfs]
>  [<c0177824>] ? exec_permission+0x15/0x4b
>  [<c0177fbd>] ? link_path_walk+0x4f/0x456
>  [<c017867d>] ? path_walk+0x4c/0xa8
>  [<c0179678>] ? do_path_lookup+0x1f/0x68
>  [<c017a3fb>] ? user_path_at+0x37/0x5f
>  [<c016359c>] ? handle_mm_fault+0x229/0x55b
>  [<c0170a2d>] ? sys_faccessat+0x93/0x146
>  [<c0170aef>] ? sys_access+0xf/0x13
>  [<c02cf615>] ? syscall_call+0x7/0xb
> Code: 0f 94 c2 84 d2 74 09 8b 44 24 0c e8 6a e9 8b de 83 c4 14 89 d8 5b 5e 5f 5d c3 55 57 56 53 83 ec 1c fc 89 c6 8b 40 10 89 44 24 04 <8b> 58 58 85 db 0f 85 d4 00 00 00 0f b7 46 70 8b 56 20 89 c5 83
> EIP: [<e186ed94>] rpcauth_refreshcred+0x11/0x12c [sunrpc] SS:ESP 0068:de571d58
> CR2: 0000000000000058
> 
> This appears to be caused by the function rpc_verify_header() first
> calling xprt_release(), then doing a call_refresh. If we release the
> transport slot, we should _always_ jump back to call_reserve before
> calling anything else.
> 
> Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> 
> ---
>  net/sunrpc/clnt.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: linux/net/sunrpc/clnt.c
> ===================================================================
> --- linux.orig/net/sunrpc/clnt.c
> +++ linux/net/sunrpc/clnt.c
> @@ -1593,7 +1593,7 @@ rpc_verify_header(struct rpc_task *task)
>  			rpcauth_invalcred(task);
>  			/* Ensure we obtain a new XID! */
>  			xprt_release(task);
> -			task->tk_action = call_refresh;
> +			task->tk_action = call_reserve;
>  			goto out_retry;
>  		case RPC_AUTH_BADCRED:
>  		case RPC_AUTH_BADVERF:

-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@...app.com
www.netapp.com

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