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Date:	Mon, 30 Nov 2009 12:11:21 +0530
From:	Sachin Sant <sachinp@...ibm.com>
To:	netdev <netdev@...r.kernel.org>
CC:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, Jan-Bernd Themann <THEMANN@...ibm.com>,
	HERING2@...ibm.com, David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [-next Nov 25] eHEA driver failure during boot(bisected)

eHEA driver fails to initialize on a power6 box while booting
latest next. Following are the messages which gets
logged during failure (this is with 20091125 next(f3645ca..))

Unable to handle kernel paging request for data at address 0x409d0148e8e40018
Faulting instruction address: 0xc00000000003c0cc
Oops: Kernel access of bad area, sig: 11 [#1]
SMP NR_CPUS=1024 NUMA pSeries
Modules linked in: fuse loop dm_mod sr_mod cdrom ehea sg sd_mod crc_t10dif ibmvscsic scsi_transport_srp scsi_tgt scsi_mod
NIP: c00000000003c0cc LR: c00000000003ce50 CTR: 0000000000091b94
REGS: c00000000cade820 TRAP: 0300   Not tainted  (2.6.32-rc8-autotest-next-20091125)
MSR: 8000000000001032 <ME,IR,DR>  CR: 28020424  XER: 00000020
DAR: 409d0148e8e40018, DSISR: 0000000040000000
TASK = c00000000c818d60[1683] 'ip' THREAD: c00000000cadc000 CPU: 1
GPR00: 0000000000000010 c00000000cadeaa0 c000000000b28340 409d0148e8e40008
GPR04: d00008008000f040 c00000000cadeb20 0000000000001000 0000000000000000
GPR08: 000000000000001c c0000000018c0398 0000000000000000 c000000000bc0000
GPR12: 8000000000009032 c000000000bc2880 00000000ffffffff ffffffffffffffff
GPR16: 00000000203c8fc0 c00000000cadf4a8 c00000000cadf450 c00000000e4c0000
GPR20: 0000000000000300 0000000000000201 c000000000c68590 c000000000bc0000
GPR24: 0000000000000000 0000000000e5f87e 0000000000000001 c000000009920000
GPR28: 0000000000000000 d00008008000f040 0000000000000000 c000000000a63328
NIP [c00000000003c0cc] .subpage_protection+0x48/0x8c
LR [c00000000003ce50] .hash_page+0x3e0/0x45c
Call Trace:
[c00000000cadeaa0] [00000000ffffffff] 0xffffffff (unreliable)
[c00000000cadeb90] [c0000000000055d0] .do_hash_page+0x50/0x6c
--- Exception: 301 at .ehea_create_cq+0x234/0x2bc [ehea]
   LR = .ehea_create_cq+0x1c0/0x2bc [ehea]
[c00000000cadef40] [d0000000015e46fc] .ehea_init_port_res+0xb4/0x47c [ehea]
[c00000000cadf000] [d0000000015e4bd8] .ehea_up+0x114/0x6bc [ehea]
[c00000000cadf110] [d0000000015e51e0] .ehea_open+0x60/0x114 [ehea]
[c00000000cadf1b0] [c000000000542e7c] .dev_open+0x11c/0x19c
[c00000000cadf240] [c000000000541e7c] .dev_change_flags+0x10c/0x214
[c00000000cadf2e0] [c00000000054e0f8] .do_setlink+0x304/0x41c
[c00000000cadf3c0] [c00000000054f324] .rtnl_newlink+0x388/0x600
[c00000000cadf5d0] [c00000000054ef50] .rtnetlink_rcv_msg+0x260/0x2ac
[c00000000cadf680] [c000000000568104] .netlink_rcv_skb+0x74/0x108
[c00000000cadf710] [c00000000054eccc] .rtnetlink_rcv+0x34/0x58
[c00000000cadf7a0] [c000000000567bfc] .netlink_unicast+0x32c/0x408
[c00000000cadf870] [c0000000005688d8] .netlink_sendmsg+0x2d0/0x310
[c00000000cadf950] [c000000000529c9c] .sock_sendmsg+0xe0/0x11c
[c00000000cadfb50] [c000000000529fc8] .SyS_sendmsg+0x1f4/0x288
[c00000000cadfd70] [c000000000527f88] .SyS_socketcall+0x214/0x280
[c00000000cadfe30] [c0000000000085b4] syscall_exit+0x0/0x40
Instruction dump:
78000020 7fa40040 409d0020 7889aae0 39290072 79291f24 7d2b4a14 e8690010
2fa30000 419e0048 788014e2 78001f24 <7c63002a> 2fa30000 419e0034 788084a2
---[ end trace cacb4bbddb53f7bd ]---

This problem was introduced between next-20091119 and next-20091120.
Bisection leads to the following patch :

commit 2939e275994977b6c9eb7fd082b7b0caa35b96b0
netsched: Allow var_sk_bound_if meta to work on all namespaces

If i revert this patch the eHEA interface is initialized properly.

Thanks
-Sachin


-- 

---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
---------------------------------

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