From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Olivier B." Subject: kernel NULL pointer dereference in netback_uevent Date: Sat, 24 Jul 2010 01:56:23 +0200 Message-ID: <4C4A2C27.6040508@daevel.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org Hi, I've just compile a new pv_ops 2.6.32.16 pv_ops kernel for my Dom0, it works but when I reboot a DomU I obtain that strace : Jul 24 01:48:08 keron kernel: [ 2108.807624] vlan: port 2(vif2.0) entering disabled state Jul 24 01:48:08 keron kernel: [ 2108.819009] vlan: port 2(vif2.0) entering disabled state Jul 24 01:48:09 keron kernel: [ 2109.869360] BUG: unable to handle kernel NULL pointer dereference at 0000000000000150 Jul 24 01:48:09 keron kernel: [ 2109.869457] IP: [] netback_uevent+0x8b/0xb9 Jul 24 01:48:09 keron kernel: [ 2109.869515] PGD 3e06d067 PUD 324cc067 PMD 0 Jul 24 01:48:09 keron kernel: [ 2109.869571] Oops: 0000 [#1] SMP Jul 24 01:48:09 keron kernel: [ 2109.869620] last sysfs file: /sys/devices/vif-3-0/uevent Jul 24 01:48:09 keron kernel: [ 2109.869670] CPU 3 Jul 24 01:48:09 keron kernel: [ 2109.869711] Modules linked in: xt_tcpudp xt_physdev bridge xen_evtchn iptable_filter iptable_mangle xenfs iptable_raw ip_tables x_tables authenc esp4 ah4 xfrm4_mode_transport deflate zlib_deflate ctr twofish twofish_common camellia serpent blowfish cast5 des_generic cbc aes_x86_64 aes_generic xcbc rmd160 sha256_generic sha1_generic hmac crypto_null af_key xfs exportfs 8021q garp stp drbd cn tpm_tis tpm tpm_bios i2c_i801 i2c_core snd_pcm snd_timer snd soundcore snd_page_alloc pcspkr joydev evdev ioatdma button processor acpi_processor ext3 jbd mbcache dm_mod usbhid hid ata_generic uhci_hcd ses sd_mod crc_t10dif enclosure ata_piix ehci_hcd libata megaraid_sas usbcore nls_base scsi_mod ixgbe mdio thermal thermal_sys igb dca [last unloaded: scsi_wait_scan] Jul 24 01:48:09 keron kernel: [ 2109.870516] Pid: 8893, comm: udevd Not tainted 2.6.32.16-dae-dom0 #1 S5520HC Jul 24 01:48:09 keron kernel: [ 2109.870571] RIP: e030:[] [] netback_uevent+0x8b/0xb9 Jul 24 01:48:09 keron kernel: [ 2109.870659] RSP: e02b:ffff88003e617e08 EFLAGS: 00010246 Jul 24 01:48:09 keron kernel: [ 2109.870709] RAX: 01000000000000c1 RBX: ffff88003cde9000 RCX: 000000000080007e Jul 24 01:48:09 keron kernel: [ 2109.870764] RDX: ffff88003d1bfdc0 RSI: ffffea0000d5e1c8 RDI: 01000000000002c0 Jul 24 01:48:09 keron kernel: [ 2109.870820] RBP: ffff88003222c000 R08: 0000000000000000 R09: 0000000000000073 Jul 24 01:48:09 keron kernel: [ 2109.870875] R10: 0000000000000000 R11: 0000000000000400 R12: 0000000000000000 Jul 24 01:48:09 keron kernel: [ 2109.870931] R13: ffff88003d1bfb00 R14: ffff88003e54c000 R15: ffffffff8149c020 Jul 24 01:48:09 keron kernel: [ 2109.870988] FS: 00007f6b21e877a0(0000) GS:ffff88000345f000(0000) knlGS:0000000000000000 Jul 24 01:48:09 keron kernel: [ 2109.871074] CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b Jul 24 01:48:09 keron kernel: [ 2109.871124] CR2: 0000000000000150 CR3: 00000000338f6000 CR4: 0000000000002660 Jul 24 01:48:09 keron kernel: [ 2109.871180] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Jul 24 01:48:09 keron kernel: [ 2109.871235] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Jul 24 01:48:09 keron kernel: [ 2109.871291] Process udevd (pid: 8893, threadinfo ffff88003e616000, task ffff88003d541c00) Jul 24 01:48:09 keron kernel: [ 2109.871376] Stack: Jul 24 01:48:09 keron kernel: [ 2109.871414] 00000000000080d0 ffff88003cde9040 ffff88003222c000 ffff88003fc2d840 Jul 24 01:48:09 keron kernel: [ 2109.871479] <0> ffff88003cde9050 ffffffff8122a313 ffff88003e617f58 ffff88003fc2d840 Jul 24 01:48:09 keron kernel: [ 2109.871579] <0> ffff88003cde9050 0000000000000000 ffff88003222c000 ffffffff8122afda Jul 24 01:48:09 keron kernel: [ 2109.871709] Call Trace: Jul 24 01:48:09 keron kernel: [ 2109.871752] [] ? dev_uevent+0xff/0x141 Jul 24 01:48:09 keron kernel: [ 2109.871803] [] ? show_uevent+0x7e/0xd0 Jul 24 01:48:09 keron kernel: [ 2109.871854] [] ? dev_attr_show+0x1e/0x44 Jul 24 01:48:09 keron kernel: [ 2109.871907] [] ? __get_free_pages+0x9/0x47 Jul 24 01:48:09 keron kernel: [ 2109.871959] [] ? sysfs_read_file+0xab/0x131 Jul 24 01:48:09 keron kernel: [ 2109.872011] [] ? vfs_read+0xa1/0xfc Jul 24 01:48:09 keron kernel: [ 2109.872061] [] ? sys_read+0x45/0x6b Jul 24 01:48:09 keron kernel: [ 2109.872111] [] ? system_call_fastpath+0x16/0x1b Jul 24 01:48:09 keron kernel: [ 2109.872163] Code: c7 c6 a2 7a 3e 81 31 c0 48 89 ef e8 8c fe f8 ff 85 c0 74 0f 4c 89 ef bd f4 ff ff ff e8 c3 7b ee ff eb 2c 4c 89 ef e8 b9 7b ee ff <49> 8b 94 24 50 01 00 00 48 89 ef 31 c0 48 c7 c6 ac 7a 3e 81 bd Jul 24 01:48:09 keron kernel: [ 2109.872583] RIP [] netback_uevent+0x8b/0xb9 Jul 24 01:48:09 keron kernel: [ 2109.872637] RSP Jul 24 01:48:09 keron kernel: [ 2109.872681] CR2: 0000000000000150 Jul 24 01:48:09 keron kernel: [ 2109.873013] ---[ end trace 7c91c1bde16ffdaa ]--- Note : I'm running Xen 4.0.1~rc3-1 from Debian Squeeze. Do you need more info ? Thanks, Olivier