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Re: [Xen-devel] kernel panic in skb_copy_bits

On 06/29/2013 12:20 AM, Eric Dumazet wrote:
On Sat, 2013-06-29 at 07:36 +0800, Joe Jin wrote:
Hi Eric,

The patch not fix the issue and panic as same as early I posted:
BUG: unable to handle kernel paging request at ffff88006d9e8d48
IP: [<ffffffff812605bb>] memcpy+0xb/0x120
PGD 1798067 PUD 1fd2067 PMD 213f067 PTE 0
Oops: 0000 [#1] SMP
Modules linked in: dm_nfs tun nfs fscache auth_rpcgss nfs_acl xen_blkback 
xen_netback xen_gntdev xen_evtchn lockd sunrpc bridge stp llc bonding be2iscsi 
iscsi_boot_sysfs ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr 
iscsi_tcp bnx2i cnic uio ipv6 cxgb3i libcxgbi cxgb3 mdio dm_round_robin 
dm_multipath libiscsi_tcp libiscsi scsi_transport_iscsi xenfs xen_privcmd video 
sbs sbshc acpi_memhotplug acpi_ipmi ipmi_msghandler parport_pc lp parport ixgbe 
dca sr_mod cdrom bnx2 radeon ttm drm_kms_helper drm snd_seq_dummy i2c_algo_bit 
i2c_core snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss 
snd_mixer_oss serio_raw snd_pcm snd_timer snd soundcore snd_page_alloc iTCO_wdt 
pcspkr iTCO_vendor_support pata_acpi dcdbas i5k_amb ata_generic hwmon floppy 
ghes i5000_edac edac_core hed dm_snapshot dm_zero dm_mirror dm_region_hash 
dm_log dm_mod usb_storage lpfc scsi_transport_fc scsi_tgt ata_piix sg shpchp 
mptsas mptscsih mptbase scsi_transport_sas sd_mod crc_t10dif ex!
   jbd mbcac

Pid: 0, comm: swapper Tainted: G        W   2.6.39-300.32.1.el5uek #1 Dell Inc. 
PowerEdge 2950/0DP246

By the way my patch was for current kernels, not for 2.6.39

Do you know if your patch should go in 3.9?

Your test case sounds a bit like what gives us the rare crash in tcp_collapse
(we have lots of bouncing wifi interfaces running slow-speed TCP trafic).  But,
it takes days for us to hit the problem most of the time.


Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc  http://www.candelatech.com

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