Date:	Fri, 21 Mar 2008 03:35:30 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	denys@...p.net.lb
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: possible lockdep crash (was Re: kernel panic, ip_route_input,
 2.6.25-rc6-git2)

From: "Denys Fedoryshchenko" <denys@...p.net.lb>
Date: Fri, 21 Mar 2008 11:33:04 +0200

> Hi, after trying to boot 2.6.25-rc6-git2 on loaded router, got kernel panic 
> almost immediately (i am able to ssh, but router panic's in next 10-30 
> seconds)
> 
> Here is netconsole output. It crashes also without netconsole (cause i heard 
> patch not in stable yet, i tried to not use netconsole to avoid this bug).

The IP may point to ip_route_input(), but the entire top of the
backtrace is in the lockdep code.  Which makes me quite suspicious.

> Mar 21 11:26:46 ROUTER [   12.125124] BUG: unable to handle kernel
> Mar 21 11:26:46 ROUTER paging request
> Mar 21 11:26:46 ROUTER at c013d19a
> Mar 21 11:26:46 ROUTER [   12.125181] IP:
> Mar 21 11:26:46 ROUTER [<c0285798>] ip_route_input+0xa70/0xe56
> Mar 21 11:26:46 ROUTER [   12.125181] Oops: 0003 [#1]
> Mar 21 11:26:46 ROUTER SMP
> Mar 21 11:26:46 ROUTER
> Mar 21 11:26:46 ROUTER [   12.125181] Modules linked in:
> Mar 21 11:26:46 ROUTER softdog
> Mar 21 11:26:46 ROUTER nf_nat_pptp
> Mar 21 11:26:46 ROUTER nf_nat_proto_gre
> Mar 21 11:26:46 ROUTER nf_conntrack_pptp
> Mar 21 11:26:46 ROUTER nf_conntrack_proto_gre
> Mar 21 11:26:46 ROUTER netconsole
> Mar 21 11:26:46 ROUTER configfs
> Mar 21 11:26:46 ROUTER xt_tcpudp
> Mar 21 11:26:46 ROUTER ipt_TTL
> Mar 21 11:26:46 ROUTER ipt_ttl
> Mar 21 11:26:46 ROUTER xt_NOTRACK
> Mar 21 11:26:46 ROUTER iptable_raw
> Mar 21 11:26:46 ROUTER iptable_mangle
> Mar 21 11:26:46 ROUTER ifb
> Mar 21 11:26:46 ROUTER e1000e
> Mar 21 11:26:46 ROUTER em_nbyte
> Mar 21 11:26:46 ROUTER cls_tcindex
> Mar 21 11:26:46 ROUTER act_gact
> Mar 21 11:26:46 ROUTER cls_rsvp
> Mar 21 11:26:46 ROUTER sch_htb
> Mar 21 11:26:46 ROUTER cls_fw
> Mar 21 11:26:46 ROUTER act_mirred
> Mar 21 11:26:46 ROUTER em_u32
> Mar 21 11:26:46 ROUTER sch_red
> Mar 21 11:26:46 ROUTER sch_sfq
> Mar 21 11:26:46 ROUTER sch_tbf
> Mar 21 11:26:46 ROUTER sch_teql
> Mar 21 11:26:46 ROUTER cls_basic
> Mar 21 11:26:46 ROUTER act_police
> Mar 21 11:26:46 ROUTER sch_gred
> Mar 21 11:26:46 ROUTER act_pedit
> Mar 21 11:26:46 ROUTER sch_hfsc
> Mar 21 11:26:46 ROUTER cls_rsvp6
> Mar 21 11:26:46 ROUTER sch_ingress
> Mar 21 11:26:46 ROUTER em_meta
> Mar 21 11:26:46 ROUTER em_text
> Mar 21 11:26:46 ROUTER act_ipt
> Mar 21 11:26:46 ROUTER sch_dsmark
> Mar 21 11:26:46 ROUTER sch_prio
> Mar 21 11:26:46 ROUTER sch_netem
> Mar 21 11:26:46 ROUTER act_simple
> Mar 21 11:26:46 ROUTER cls_u32
> Mar 21 11:26:46 ROUTER em_cmp
> Mar 21 11:26:46 ROUTER sch_cbq
> Mar 21 11:26:46 ROUTER cls_route
> Mar 21 11:26:46 ROUTER xt_TCPMSS
> Mar 21 11:26:46 ROUTER iptable_nat
> Mar 21 11:26:46 ROUTER nf_conntrack_ipv4
> Mar 21 11:26:46 ROUTER ipt_LOG
> Mar 21 11:26:46 ROUTER ipt_MASQUERADE
> Mar 21 11:26:46 ROUTER ipt_REDIRECT
> Mar 21 11:26:46 ROUTER nf_nat
> Mar 21 11:26:46 ROUTER nf_conntrack
> Mar 21 11:26:46 ROUTER nfnetlink
> Mar 21 11:26:46 ROUTER iptable_filter
> Mar 21 11:26:46 ROUTER ip_tables
> Mar 21 11:26:46 ROUTER x_tables
> Mar 21 11:26:46 ROUTER 8021q
> Mar 21 11:26:46 ROUTER tun
> Mar 21 11:26:46 ROUTER tulip
> Mar 21 11:26:46 ROUTER r8169
> Mar 21 11:26:46 ROUTER sky2
> Mar 21 11:26:46 ROUTER via_velocity
> Mar 21 11:26:46 ROUTER via_rhine
> Mar 21 11:26:46 ROUTER sis900
> Mar 21 11:26:46 ROUTER ne2k_pci
> Mar 21 11:26:46 ROUTER 8390
> Mar 21 11:26:46 ROUTER skge
> Mar 21 11:26:46 ROUTER tg3
> Mar 21 11:26:46 ROUTER 8139too
> Mar 21 11:26:46 ROUTER e1000
> Mar 21 11:26:46 ROUTER e100
> Mar 21 11:26:46 ROUTER usb_storage
> Mar 21 11:26:46 ROUTER mtdblock
> Mar 21 11:26:46 ROUTER mtd_blkdevs
> Mar 21 11:26:46 ROUTER usbhid
> Mar 21 11:26:46 ROUTER uhci_hcd
> Mar 21 11:26:46 ROUTER ehci_hcd
> Mar 21 11:26:46 ROUTER ohci_hcd
> Mar 21 11:26:46 ROUTER usbcore
> Mar 21 11:26:46 ROUTER
> Mar 21 11:26:46 ROUTER [   12.125181]
> Mar 21 11:26:46 ROUTER [   12.125181] Pid: 0, comm: swapper Not tainted 
> (2.6.25-rc6-git2-build-0024 #8)
> Mar 21 11:26:46 ROUTER [   12.125181] EIP: 0060:[<c0285798>] EFLAGS: 00010286 
> CPU: 0
> Mar 21 11:26:46 ROUTER [   12.125181] EIP is at ip_route_input+0xa70/0xe56
> Mar 21 11:26:46 ROUTER [   12.125181] EAX: c0999200 EBX: 000000c2 ECX: 
> c038ea2c EDX: c013d182
> Mar 21 11:26:46 ROUTER [   12.125181] ESI: c099ff04 EDI: c099ff04 EBP: 
> c099ff30 ESP: c099fe94
> Mar 21 11:26:46 ROUTER [   12.125181]  DS: 007b ES: 007b FS: 00d8 GS: 0000 
> SS: 0068
> Mar 21 11:26:46 ROUTER [   12.125181] Process swapper (pid: 0, ti=c099f000 
> task=c038e460 task.ti=c03b9000)
> Mar 21 11:26:46 ROUTER
> Mar 21 11:26:46 ROUTER [   12.125181] Stack:
> Mar 21 11:26:46 ROUTER c099fec8
> Mar 21 11:26:46 ROUTER be9a92c2
> Mar 21 11:26:46 ROUTER de0aa8c0
> Mar 21 11:26:46 ROUTER f6fc6cc0
> Mar 21 11:26:46 ROUTER c013bdc3
> Mar 21 11:26:46 ROUTER 00000001
> Mar 21 11:26:46 ROUTER c038e460
> Mar 21 11:26:46 ROUTER 00000001
> Mar 21 11:26:46 ROUTER
> Mar 21 11:26:46 ROUTER [   12.125181]
> Mar 21 11:26:46 ROUTER ffffff8f
> Mar 21 11:26:46 ROUTER 0099fec8
> Mar 21 11:26:46 ROUTER f7c3bc00
> Mar 21 11:26:46 ROUTER c0be25a0
> Mar 21 11:26:46 ROUTER 0038e460
> Mar 21 11:26:46 ROUTER 00000000
> Mar 21 11:26:46 ROUTER 00000003
> Mar 21 11:26:46 ROUTER 00000000
> Mar 21 11:26:46 ROUTER
> Mar 21 11:26:46 ROUTER [   12.125181]
> Mar 21 11:26:46 ROUTER de0aa8c0
> Mar 21 11:26:46 ROUTER be9a92c2
> Mar 21 11:26:46 ROUTER 00000000
> Mar 21 11:26:46 ROUTER 00000000
> Mar 21 11:26:46 ROUTER 00000000
> Mar 21 11:26:46 ROUTER 00000000
> Mar 21 11:26:46 ROUTER 00000000
> Mar 21 11:26:46 ROUTER 00000000
> Mar 21 11:26:46 ROUTER
> Mar 21 11:26:46 ROUTER [   12.125181] Call Trace:
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c013bdc3>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER mark_held_locks+0x41/0x5c
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c013d182>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER lock_release+0x16b/0x172
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c02825e8>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER nf_hook_slow+0xa1/0xc1
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c02871a0>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER ip_rcv_finish+0x2c/0x2f4
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c028789b>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER ip_rcv+0x202/0x22c
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c026c809>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER netif_receive_skb+0x38d/0x3ec
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c026ee8b>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER process_backlog+0x6c/0xd3
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c026ee96>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER process_backlog+0x77/0xd3
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c026e977>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER net_rx_action+0xb3/0x1d8
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c0125846>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER __do_softirq+0x6f/0xe9
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c01060ab>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER do_softirq+0x5e/0xa8
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c0146413>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER handle_fasteoi_irq+0x0/0xb6
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c01257a4>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER irq_exit+0x44/0x77
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c01061af>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER do_IRQ+0xba/0xd3
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c010438e>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER common_interrupt+0x2e/0x34
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c01300d8>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER sys_clock_nanosleep+0x19/0xb0
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c01021ba>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER mwait_idle_with_hints+0x3a/0x3e
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c0102365>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER mwait_idle+0x0/0x14
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c0102377>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER mwait_idle+0x12/0x14
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c010266d>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER cpu_idle+0x8a/0xa6
> Mar 21 11:26:46 ROUTER [   12.125181]  [<c02b86c5>]
> Mar 21 11:26:46 ROUTER ?
> Mar 21 11:26:46 ROUTER rest_init+0x49/0x4b
> Mar 21 11:26:46 ROUTER [   12.125181]  =======================
> Mar 21 11:26:46 ROUTER [   12.125181] Code:
> Mar 21 11:26:46 ROUTER 80
> Mar 21 11:26:46 ROUTER 01
> Mar 21 11:26:46 ROUTER 00
> Mar 21 11:26:46 ROUTER 00
> Mar 21 11:26:46 ROUTER 00
> Mar 21 11:26:46 ROUTER 8b
> Mar 21 11:26:46 ROUTER 55
> Mar 21 11:26:46 ROUTER 8c
> Mar 21 11:26:46 ROUTER f0
> Mar 21 11:26:46 ROUTER ff
> Mar 21 11:26:46 ROUTER 4a
> Mar 21 11:26:46 ROUTER 04
> Mar 21 11:26:46 ROUTER 0f
> Mar 21 11:26:46 ROUTER 94
> Mar 21 11:26:46 ROUTER c0
> Mar 21 11:26:46 ROUTER 84
> Mar 21 11:26:46 ROUTER c0
> Mar 21 11:26:46 ROUTER 74
> Mar 21 11:26:46 ROUTER 07
> Mar 21 11:26:46 ROUTER 89
> Mar 21 11:26:46 ROUTER d0
> Mar 21 11:26:46 ROUTER e8
> Mar 21 11:26:46 ROUTER df
> Mar 21 11:26:46 ROUTER 02
> Mar 21 11:26:46 ROUTER 02
> Mar 21 11:26:46 ROUTER 00
> Mar 21 11:26:46 ROUTER 83
> Mar 21 11:26:46 ROUTER 7d
> Mar 21 11:26:46 ROUTER 80
> Mar 21 11:26:46 ROUTER 00
> Mar 21 11:26:46 ROUTER 0f
> Mar 21 11:26:46 ROUTER 84
> Mar 21 11:26:46 ROUTER e2
> Mar 21 11:26:46 ROUTER 03
> Mar 21 11:26:46 ROUTER 00
> Mar 21 11:26:46 ROUTER 00
> Mar 21 11:26:46 ROUTER 8b
> Mar 21 11:26:46 ROUTER 55
> Mar 21 11:26:46 ROUTER d8
> Mar 21 11:26:46 ROUTER 85
> Mar 21 11:26:46 ROUTER d2
> Mar 21 11:26:46 ROUTER 74
> Mar 21 11:26:46 ROUTER 12
> Mar 21 11:26:46 ROUTER unparseable log message: "<f0> "
> Mar 21 11:26:46 ROUTER ff
> Mar 21 11:26:46 ROUTER 4a
> Mar 21 11:26:46 ROUTER 18
> Mar 21 11:26:46 ROUTER 0f
> Mar 21 11:26:46 ROUTER 94
> Mar 21 11:26:46 ROUTER c0
> Mar 21 11:26:46 ROUTER 84
> Mar 21 11:26:46 ROUTER c0
> Mar 21 11:26:46 ROUTER 74
> Mar 21 11:26:46 ROUTER 07
> Mar 21 11:26:46 ROUTER 89
> Mar 21 11:26:46 ROUTER d0
> Mar 21 11:26:46 ROUTER e8
> Mar 21 11:26:46 ROUTER cf
> Mar 21 11:26:46 ROUTER 7c
> Mar 21 11:26:46 ROUTER 02
> Mar 21 11:26:46 ROUTER 00
> Mar 21 11:26:46 ROUTER 8b
> Mar 21 11:26:46 ROUTER 55
> Mar 21 11:26:46 ROUTER dc
> Mar 21 11:26:46 ROUTER
> Mar 21 11:26:46 ROUTER [   12.125181] EIP: [<c0285798>]
> Mar 21 11:26:46 ROUTER ip_route_input+0xa70/0xe56
> Mar 21 11:26:46 ROUTER SS:ESP 0068:c099fe94
> Mar 21 11:26:46 ROUTER [   12.125181] Kernel panic - not syncing: Fatal 
> exception in interrupt
> Mar 21 11:26:46 ROUTER [   12.125181] Rebooting in 1 seconds..
> 
> 
> 
> --
> Denys Fedoryshchenko
> Technical Manager
> Virtual ISP S.A.L.
> 
> --
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