From: Oliver Hartkopp <socketcan@hartkopp.net>
To: "Tietz, Fabian" <Fabian.Tietz@bachmann-technology.com>
Cc: "linux-can@vger.kernel.org" <linux-can@vger.kernel.org>
Subject: Re: Socketcan kernel panic when using dhclient.
Date: Mon, 03 Jun 2013 19:42:16 +0200 [thread overview]
Message-ID: <51ACD578.8050605@hartkopp.net> (raw)
In-Reply-To: <41B73DFEBC62264A887C90F789C9F99C4452DC@bws-exmb01.bama.eu.com>
On 03.06.2013 17:27, Tietz, Fabian wrote:
> Hello,
>
> We are using socketcan on AT91SAM 9x25 Hardware, Stock Kernel 2.6.39, no experimental Atmel patches applied.
>
> When using dhclient, we experience the following kernel oops. Any hints on this issue?
>
Hello Fabian,
I don't know why dhclient results in a skb_under_panic().
I tried this on the latest 3.10.0-rc kernel without any crash:
$ strace dhlient vcan3
(..)
open("/proc/net/dev", O_RDONLY) = 4
fstat64(4, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7564000
read(4, "Inter-| Receive "..., 1024) = 1024
socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP) = 5
ioctl(5, SIOCGIFADDR, {ifr_name="vcan3", ???}) = -1 EADDRNOTAVAIL (Cannot assign requested address)
(..)
socket(PF_PACKET, SOCK_PACKET, 768) = 5
bind(5, {sa_family=AF_PACKET, proto=0x7663, if3370593, pkttype=PACKET_HOST, addr(0)={0, }, 16) = 0
socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 6
ioctl(6, SIOCGIFHWADDR, {ifr_name="vcan3", ifr_hwaddr=00:00:00:00:00:00}) = 0
time(NULL) = 1370280852
send(3, "<27>Jun 3 19:34:12 dhclient: Un"..., 69, MSG_NOSIGNAL) = 69
exit_group(1) = ?
Of course you can not assign any IP address to a CAN interface.
Syslog says - Unsupported device type 280 for "vcan3"
Maybe is helps to update your kernel to 2.6.39.4 ...
Can you do a strace on your dhclient?
Regards,
Oliver
> Regards,
> Fabian
> -------snip--------
>
> ioctl(6, SIOCGIFADDR, {ifr_name="lo", ifr_addr={AF_INET, inet_addr("127.0.0.1")}}) = 0
> ioctl(6, SIOCGIFFLAGS, {ifr_name="lo", ifr_flags=IFF_UP|IFF_LOOPBACK|IFF_RUNNING}) = 0
> ioctl(6, SIOCGIFADDR, {ifr_name="can0", ???}) = -1 EADDRNOTAVAIL (Cannot assiskb_under_panic: text:c02ac490 len:-960460656 put:-960460672 head:c6c08860 data: (null) tail:0xc6c08890 end:0xc6c088a0 dev:can0
> kernel BUG at net/core/skbuff.c:146!
> Unable to handle kernel NULL pointer dereference at virtual address 00000000
> pgd = c0004000
> [00000000] *pgd=00000000
> Internal error: Oops: 817 [#1]
> last sysfs file: /sys/devices/platform/leds-gpio/leds/can_red/brightness
> Modules linked in:
> CPU: 0 Tainted: G W (2.6.39-GHOST-Rev.:167 #34)
> PC is at __bug+0x1c/0x28
> LR is at __bug+0x18/0x28
> pc : [<c0032784>] lr : [<c0032780>] psr: 60000013
> sp : c7991e18 ip : 00000003 fp : c7991f84
> r10: c7adabd0 r9 : 00000003 r8 : c03aa464
> r7 : 00000000 r6 : c6c08890 r5 : c6c088a0 r4 : c0367451
> r3 : 00000000 r2 : c7991e0c r1 : c03412f9 r0 : 0000002b
> Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel
> Control: 0005317f Table: 27bf4000 DAC: 00000017
> Process kworker/0:1 (pid: 397, stack limit = 0xc7990270)
> Stack: (0xc7991e18 to 0xc7992000)
> 1e00: c6c08890 c01f3960
> 1e20: c6c08860 00000000 c6c08890 c6c088a0 c7963800 c01f28a0 c784d200 c7963800
> 1e40: c7adaa00 c02ac490 c7963800 c7963800 c03ae778 00000000 00000c00 c01fc510
> 1e60: c7963800 00000000 0000012c c784d2c0 c7991ea4 c03ae798 0000012c c7963800
> 1e80: 00000000 0000012c 00000006 44200000 c7963be8 c01b0cb4 20000013 ffffffff
> 1ea0: fefff000 c6c08880 00000000 c7963be8 00000001 0000012c 00000006 0000000a
> 1ec0: 00000003 ffffa4e0 c7991f84 c01fc918 c03b3b1c 00000001 0000000c c7990000
> 1ee0: 00000100 0000000a c03d4f04 c00442cc 00000000 00000008 0000001e 00000000
> 1f00: 0000001e 00000000 00000000 00000000 c79d64a8 c002a080 60000013 ffffffff
> 1f20: fefff000 c002f7b4 c03bcd54 00000003 c03bcd60 00000000 60000013 c7812800
> 1f40: c0163a50 00000000 00000000 00000000 c79d64a8 c7991f84 60000093 c7991f70
> 1f60: c003a3e4 c003a3e8 60000013 ffffffff 00000000 c0163a50 c7923da0 c7923da0
> 1f80: 00000000 c00510fc 80000093 c7923da0 c03b4e3c c7923db0 00000001 c03b4e3c
> 1fa0: 00000000 00000009 00000000 c0051cf8 00000000 c7827f38 c7923da0 c0051b30
> 1fc0: 00000013 00000000 00000000 c005500c 00000000 00000000 c7923da0 00000000
> 1fe0: c7991fe0 c7991fe0 c7827f38 c0054f90 c0030a18 c0030a18 c1200092 11100a25
> [<c0032784>] (__bug+0x1c/0x28) from [<c01f3960>] (skb_push+0x78/0x8c)
> [<c01f3960>] (skb_push+0x78/0x8c) from [<c02ac490>] (packet_rcv_spkt+0xd4/0x118)
> [<c02ac490>] (packet_rcv_spkt+0xd4/0x118) from [<c01fc510>] (__netif_receive_skb+0x32c/0x3d0)
> [<c01fc510>] (__netif_receive_skb+0x32c/0x3d0) from [<c01b0cb4>] (at91_poll+0x3e0/0x468)
> [<c01b0cb4>] (at91_poll+0x3e0/0x468) from [<c01fc918>] (net_rx_action+0x4c/0x174)
> [<c01fc918>] (net_rx_action+0x4c/0x174) from [<c00442cc>] (__do_softirq+0x84/0x120)
> [<c00442cc>] (__do_softirq+0x84/0x120) from [<c002a080>] (asm_do_IRQ+0x80/0xa0)
> [<c002a080>] (asm_do_IRQ+0x80/0xa0) from [<c002f7b4>] (__irq_svc+0x34/0x60)
> Exception stack(0xc7991f28 to 0xc7991f70)
> 1f20: c03bcd54 00000003 c03bcd60 00000000 60000013 c7812800
> 1f40: c0163a50 00000000 00000000 00000000 c79d64a8 c7991f84 60000093 c7991f70
> 1f60: c003a3e4 c003a3e8 60000013 ffffffff
> [<c002f7b4>] (__irq_svc+0x34/0x60) from [<c003a3e8>] (__wake_up+0x28/0x30)
> [<c003a3e8>] (__wake_up+0x28/0x30) from [<c00510fc>] (process_one_work+0x1e8/0x328)
> [<c00510fc>] (process_one_work+0x1e8/0x328) from [<c0051cf8>] (worker_thread+0x1c8/0x2f8)
> [<c0051cf8>] (worker_thread+0x1c8/0x2f8) from [<c005500c>] (kthread+0x7c/0x84)
> [<c005500c>] (kthread+0x7c/0x84) from [<c0030a18>] (kernel_thread_exit+0x0/0x8)
> Code: e59f0010 e1a0100c eb0a2a7d e3a03000 (e5833000)
> ---[ end trace 1b75b31a2719ed1f ]---
> Kernel panic - not syncing: Fatal exception in interrupt
> [<c003484c>] (unwind_backtrace+0x0/0xe0) from [<c02bd054>] (panic+0x50/0x174)
> [<c02bd054>] (panic+0x50/0x174) from [<c0032b6c>] (die+0x184/0x1c4)
> [<c0032b6c>] (die+0x184/0x1c4) from [<c00356c0>] (__do_kernel_fault+0x64/0x84)
> [<c00356c0>] (__do_kernel_fault+0x64/0x84) from [<c0035894>] (do_page_fault+0x1b4/0x1c8)
> [<c0035894>] (do_page_fault+0x1b4/0x1c8) from [<c002a240>] (do_DataAbort+0x34/0x98)
> [<c002a240>] (do_DataAbort+0x34/0x98) from [<c002f76c>] (__dabt_svc+0x4c/0x60)
> Exception stack(0xc7991dd0 to 0xc7991e18)
> 1dc0: 0000002b c03412f9 c7991e0c 00000000
> 1de0: c0367451 c6c088a0 c6c08890 00000000 c03aa464 00000003 c7adabd0 c7991f84
> 1e00: 00000003 c7991e18 c0032780 c0032784 60000013 ffffffff
> [<c002f76c>] (__dabt_svc+0x4c/0x60) from [<c0032784>] (__bug+0x1c/0x28)
> [<c0032784>] (__bug+0x1c/0x28) from [<c01f3960>] (skb_push+0x78/0x8c)
> [<c01f3960>] (skb_push+0x78/0x8c) from [<c02ac490>] (packet_rcv_spkt+0xd4/0x118)
> [<c02ac490>] (packet_rcv_spkt+0xd4/0x118) from [<c01fc510>] (__netif_receive_skb+0x32c/0x3d0)
> [<c01fc510>] (__netif_receive_skb+0x32c/0x3d0) from [<c01b0cb4>] (at91_poll+0x3e0/0x468)
> [<c01b0cb4>] (at91_poll+0x3e0/0x468) from [<c01fc918>] (net_rx_action+0x4c/0x174)
> [<c01fc918>] (net_rx_action+0x4c/0x174) from [<c00442cc>] (__do_softirq+0x84/0x120)
> [<c00442cc>] (__do_softirq+0x84/0x120) from [<c002a080>] (asm_do_IRQ+0x80/0xa0)
> [<c002a080>] (asm_do_IRQ+0x80/0xa0) from [<c002f7b4>] (__irq_svc+0x34/0x60)
> Exception stack(0xc7991f28 to 0xc7991f70)
> 1f20: c03bcd54 00000003 c03bcd60 00000000 60000013 c7812800
> 1f40: c0163a50 00000000 00000000 00000000 c79d64a8 c7991f84 60000093 c7991f70
> 1f60: c003a3e4 c003a3e8 60000013 ffffffff
> [<c002f7b4>] (__irq_svc+0x34/0x60) from [<c003a3e8>] (__wake_up+0x28/0x30)
> [<c003a3e8>] (__wake_up+0x28/0x30) from [<c00510fc>] (process_one_work+0x1e8/0x328)
> [<c00510fc>] (process_one_work+0x1e8/0x328) from [<c0051cf8>] (worker_thread+0x1c8/0x2f8)
> [<c0051cf8>] (worker_thread+0x1c8/0x2f8) from [<c005500c>] (kthread+0x7c/0x84)
> [<c005500c>] (kthread+0x7c/0x84) from [<c0030a18>] (kernel_thread_exit+0x0/0x8)
>
> ------------------------------------
>
>
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next prev parent reply other threads:[~2013-06-03 17:42 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-03 15:27 Socketcan kernel panic when using dhclient Tietz, Fabian
2013-06-03 17:42 ` Oliver Hartkopp [this message]
2013-06-04 7:11 ` Wolfgang Grandegger
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