lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Sat, 29 Jun 2013 00:20:28 -0700 From: Eric Dumazet <eric.dumazet@...il.com> To: Joe Jin <joe.jin@...cle.com> Cc: Frank Blaschka <frank.blaschka@...ibm.com>, "David S. Miller" <davem@...emloft.net>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "zheng.x.li@...cle.com" <zheng.x.li@...cle.com>, Xen Devel <xen-devel@...ts.xen.org>, Ian Campbell <Ian.Campbell@...rix.com>, Jan Beulich <JBeulich@...e.com>, Stefano Stabellini <stefano.stabellini@...citrix.com> Subject: Re: kernel panic in skb_copy_bits 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 > > CPU 7 > > 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 ext3! > jbd mbcac > he > > > > > > 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 For instance, I was not able to reproduce the crash with 3.3 RCU in neighbour code was added in 2.6.37, but it looks like this code is a bit fragile because all the kfree_skb() are done while neighbour locks are held. So if a skb destructor triggers a new call to neighbour code, I presume some bad things can happen. LOCKDEP could eventually help to detect this. You could try to replace these kfree_skb() calls to dev_kfree_skb_irq() just in case. (Do not forget the __skb_queue_purge() ones) Try a LOCKDEP build as well. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists