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Date: Wed, 6 Apr 2011 10:25:48 -0600
From: dann frazier <dannf@...nf.org>
To: Eric Dumazet <eric.dumazet@...il.com>
Cc: Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
"netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>
Subject: Re: shutdown oops in xt_compat_calc_jump
On Tue, Apr 05, 2011 at 09:17:59AM +0200, Eric Dumazet wrote:
> Le mardi 05 avril 2011 à 08:24 +0200, Eric Dumazet a écrit :
> > Le mardi 05 avril 2011 à 00:48 +0200, Eric Dumazet a écrit :
> > > Le lundi 04 avril 2011 à 22:37 +0200, Eric Dumazet a écrit :
> > > > Le lundi 04 avril 2011 à 22:02 +0200, Patrick McHardy a écrit :
> > > > > CCed netfilter-devel.
> > > > >
> > > > > Am 04.04.2011 21:48, schrieb dann frazier:
> > > > > > fyi, noticed this oops when shutting down a system running top of git
> > > > > > (@ 78fca1be)
> > > > > >
> > > > > > [ 1169.794644] cfg80211: Calling CRDA to update world regulatory domain
> > > > > > [ 1170.490646] bluetoothd[2029]: segfault at f8ad9944 ip 00000000f77045e0 sp 00000000ffcb14e0 error 4 in bluetoothd[f76bf000+8b000]
> > > > > > [ 1170.543817] BUG: unable to handle kernel paging request at 00000001dc1be9f8
> > > > > > [ 1170.543875] IP: [<ffffffffa051e7b0>] xt_compat_calc_jump+0x25/0x6f [x_tables]
> > > > > > [ 1170.543927] PGD 1215b3067 PUD 0
> > > > > > [ 1170.543955] Oops: 0000 [#1] SMP
> > > > > > [ 1170.543982] last sysfs file: /sys/module/bridge/initstate
> > > > > > [ 1170.544017] CPU 3
> > > > > > [ 1170.544031] Modules linked in: ebtable_broute ebtable_filter vfat msdos fat ext3 jbd ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc acpi_cpufreq mperf cpufreq_powersave cpufreq_userspace cpufreq_conservative cpufreq_stats binfmt_misc kvm(-) fuse ext2 loop snd_hda_codec_hdmi snd_hda_codec_conexant arc4 ecb snd_usb_audio snd_usbmidi_lib snd_seq_midi snd_seq_midi_event snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_rawmidi i915 drm_kms_helper thinkpad_acpi snd_seq iwlagn snd_timer snd_seq_device drm snd mac80211 psmouse btusb serio_raw bluetooth evdev tpm_tis snd_page_alloc tpm i2c_i801 i2c_algo_bit cfg80211 battery soundcore nvram tpm_bios i2c_core rfkill wmi ac power_supply video button processor ext4 mbcache jbd2 crc16 sha256_generic aesni_intel cryptd aes_x86_64 aes_generic cbc dm_crypt dm_mod sd_mod crc_t10di
> > > > > f
> > > > > > usbhid
> > > > > > hid usb_storage ahci libahci libata ehci_hcd scsi_mod usbcore e1000e thermal thermal_sys [last unloaded: kvm_intel]
> > > > > > [ 1170.544836]
> > > > > > [ 1170.544849] Pid: 4901, comm: ebtables Not tainted 2.6.39-rc1+ #9 LENOVO 2516CTO/2516CTO
> > > > > > [ 1170.544902] RIP: 0010:[<ffffffffa051e7b0>] [<ffffffffa051e7b0>] xt_compat_calc_jump+0x25/0x6f [x_tables]
> > > > > > [ 1170.544958] RSP: 0018:ffff880121473cf8 EFLAGS: 00010217
> > > > > > [ 1170.544989] RAX: 000000003b837d3f RBX: 0000000000000090 RCX: 000000007706fa7f
> > > > > > [ 1170.545029] RDX: 0000000000000000 RSI: 0000000000000090 RDI: 000000003b837d3f
> > > > > > [ 1170.545067] RBP: ffffc900111a3000 R08: 0000000000000000 R09: dead000000200200
> > > > > > [ 1170.545104] R10: dead000000100100 R11: 0000000000001311 R12: ffff880121473d88
> > > > > > [ 1170.545147] R13: ffffc900111a6000 R14: ffffffff817de300 R15: 0000000000000000
> > > > > > [ 1170.545185] FS: 0000000000000000(0000) GS:ffff880137d80000(0063) knlGS:00000000f761b6c0
> > > > > > [ 1170.545227] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
> > > > > > [ 1170.545258] CR2: 00000001dc1be9f8 CR3: 0000000125868000 CR4: 00000000000006e0
> > > > > > [ 1170.545297] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > > > > > [ 1170.545334] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> > > > > > [ 1170.545375] Process ebtables (pid: 4901, threadinfo ffff880121472000, task ffff8801322d1ac0)
> > > > > > [ 1170.545418] Stack:
> > > > > > [ 1170.545433] 0000000000000090 ffffffffa0576d46 f7007265746c6966 0000000000000054
> > > > > > [ 1170.545479] 0000000000000000 0000000000000000 000000000000000e 0000000000000090
> > > > > > [ 1170.545529] 0000000000000000 0000000008af2180 0000000008af21b0 0000000008af21e0
> > > > > > [ 1170.545579] Call Trace:
> > > > > > [ 1170.545600] [<ffffffffa0576d46>] ? compat_do_replace+0x117/0x221 [ebtables]
> > > > > > [ 1170.545639] [<ffffffffa0577392>] ? compat_do_ebt_set_ctl+0x55/0xbb [ebtables]
> > > > > > [ 1170.545688] [<ffffffff810337e3>] ? need_resched+0x1a/0x23
> > > > > > [ 1170.545723] [<ffffffff810337f1>] ? should_resched+0x5/0x24
> > > > > > [ 1170.545730] [<ffffffff81314cc5>] ? _cond_resched+0x9/0x20
> > > > > > [ 1170.545733] [<ffffffff813152fe>] ? mutex_lock_interruptible+0x18/0x32
> > > > > > [ 1170.545738] [<ffffffff8128490b>] ? nf_sockopt_find.clone.1+0xda/0xec
> > > > > > [ 1170.545742] [<ffffffff81284996>] ? compat_nf_sockopt+0x79/0xa5
> > > > > > [ 1170.545744] [<ffffffff810337f1>] ? should_resched+0x5/0x24
> > > > > > [ 1170.545747] [<ffffffff812849f3>] ? compat_nf_setsockopt+0x1a/0x1f
> > > > > > [ 1170.545751] [<ffffffff8128fb35>] ? compat_ip_setsockopt+0x80/0xa0
> > > > > > [ 1170.545756] [<ffffffff812784a2>] ? compat_sys_setsockopt+0x1d5/0x204
> > > > > > [ 1170.545759] [<ffffffff810337f1>] ? should_resched+0x5/0x24
> > > > > > [ 1170.545761] [<ffffffff81314cc5>] ? _cond_resched+0x9/0x20
> > > > > > [ 1170.545764] [<ffffffff812788a5>] ? compat_sys_socketcall+0x148/0x1a7
> > > > > > [ 1170.545768] [<ffffffff8131d2c0>] ? sysenter_dispatch+0x7/0x2e
> > > > > > [ 1170.545769] Code: 5d 41 5e 41 5f c3 40 0f b6 ff 53 31 d2 48 6b ff 70 48 03 3d 03 1b 00 00 8b 4f 6c 4c 8b 47 60 ff c9 eb 27 8d 04 11 d1 f8 48 63 f8
> > > > > > [ 1170.545787] RIP [<ffffffffa051e7b0>] xt_compat_calc_jump+0x25/0x6f [x_tables]
> > > > > > [ 1170.545792] RSP <ffff880121473cf8>
> > > > > > [ 1170.545794] CR2: 00000001dc1be9f8
> > > > > > [ 1170.654269] ---[ end trace d44667d90dcbd115 ]---
> > > > > > [ 1170.662411] fuse exit
> > > > > > Kernel logging (proc) stopped.
> > > > > > --
> > > >
> > > >
> > > > Hmm, commit 255d0dc34068a976550ce555e must have a problem for ebtables ?
> > > >
> > > > Dann, could you give us what you do with ebtables ?
> > > >
> > > > Thanks
> > > >
> > >
> > > For sure, there was a typo in above commit, but this is not enough to
> > > make ebtables work in COMPAT mode.
> > >
> > > Hmm...
> > >
> >
> > Update : xt_compat_calc_jump() misses this bit, and I still have to find
> > the ebtables problem.
> >
> > I'll provide a cumulative patch once done
> >
>
> Here is the cumulative patch
Thanks Eric. Unfortunately that didn't solve the problem I am seeing.
I rebaselined (same kernel build as before), and found that I'm able
to reproduce this 100% of the time by running only:
sudo ebtables -t filter --init-table
The backtrace I received was this:
[ 73.393223] ------------[ cut here ]------------
[ 73.394944] WARNING: at net/netfilter/x_tables.c:476 xt_compat_calc_jump+0x64/0x6f [x_tables]()
[ 73.396427] Hardware name: 2516CTO
[ 73.398079] Modules linked in: ebtable_broute ebtable_filter ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc acpi_cpufreq mperf cpufreq_powersave cpufreq_userspace cpufreq_conservative cpufreq_stats kvm_intel kvm binfmt_misc fuse ext2 loop snd_hda_codec_hdmi snd_hda_codec_conexant arc4 ecb snd_usb_audio snd_usbmidi_lib snd_seq_midi snd_seq_midi_event snd_hda_intel snd_hda_codec iwlagn snd_hwdep snd_pcm snd_seq i915 snd_rawmidi thinkpad_acpi mac80211 snd_timer snd_seq_device btusb bluetooth psmouse battery tpm_tis cfg80211 drm_kms_helper drm serio_raw nvram evdev ac tpm tpm_bios i2c_algo_bit i2c_i801 snd power_supply soundcore rfkill wmi snd_page_alloc button i2c_core video processor ext4 mbcache jbd2 crc16 sha256_generic aesni_intel cryptd aes_x86_64 aes_generic cbc dm_crypt dm_mod sd_mod crc_t10dif usbhid hid usb_storage
ahci libahci libata ehci_hcd scsi_mod usbcore e1000e thermal thermal_sys [last unloaded: scsi_wait_scan]
[ 73.412341] Pid: 2891, comm: ebtables.orig Not tainted 2.6.39-rc1+ #9
[ 73.414396] Call Trace:
[ 73.416525] [<ffffffff81041b99>] ? warn_slowpath_common+0x78/0x8c
[ 73.418631] [<ffffffffa05227ef>] ? xt_compat_calc_jump+0x64/0x6f [x_tables]
[ 73.420758] [<ffffffffa0571d46>] ? compat_do_replace+0x117/0x221 [ebtables]
[ 73.422859] [<ffffffffa0572392>] ? compat_do_ebt_set_ctl+0x55/0xbb [ebtables]
[ 73.425030] [<ffffffff810337e3>] ? need_resched+0x1a/0x23
[ 73.427110] [<ffffffff810337f1>] ? should_resched+0x5/0x24
[ 73.429183] [<ffffffff81314cc5>] ? _cond_resched+0x9/0x20
[ 73.431290] [<ffffffff813152fe>] ? mutex_lock_interruptible+0x18/0x32
[ 73.433418] [<ffffffff8128490b>] ? nf_sockopt_find.clone.1+0xda/0xec
[ 73.435520] [<ffffffff81284996>] ? compat_nf_sockopt+0x79/0xa5
[ 73.437565] [<ffffffff810337f1>] ? should_resched+0x5/0x24
[ 73.439612] [<ffffffff812849f3>] ? compat_nf_setsockopt+0x1a/0x1f
[ 73.441666] [<ffffffff8128fb35>] ? compat_ip_setsockopt+0x80/0xa0
[ 73.443697] [<ffffffff812784a2>] ? compat_sys_setsockopt+0x1d5/0x204
[ 73.445705] [<ffffffff810337f1>] ? should_resched+0x5/0x24
[ 73.447739] [<ffffffff81314cc5>] ? _cond_resched+0x9/0x20
[ 73.449813] [<ffffffff812788a5>] ? compat_sys_socketcall+0x148/0x1a7
[ 73.451873] [<ffffffff8131d2c0>] ? sysenter_dispatch+0x7/0x2e
[ 73.453894] ---[ end trace 2285ecdee0e743d3 ]---
[ 73.745725] Ebtables v2.0 unregistered
I reliably get the same backtrace, which is slightly different than
the one I originally submitted. I've only seen that original backtrace
once.
I then applied your patch, but I'm still seeing a similar backtrace:
[ 33.143939] ------------[ cut here ]------------
[ 33.146063] WARNING: at net/netfilter/x_tables.c:479 xt_compat_calc_jump+0x6f/0x7a [x_tables]()
[ 33.148360] Hardware name: 2516CTO
[ 33.150654] Modules linked in: ebtable_filter ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc acpi_cpufreq mperf cpufreq_powersave cpufreq_userspace cpufreq_conservative cpufreq_stats kvm_intel kvm binfmt_misc fuse ext2 loop snd_hda_codec_hdmi snd_hda_codec_conexant arc4 ecb thinkpad_acpi i915 snd_hda_intel iwlagn snd_hda_codec snd_hwdep snd_pcm mac80211 drm_kms_helper drm snd_seq snd_timer psmouse i2c_i801 btusb snd_seq_device bluetooth ac cfg80211 evdev tpm_tis snd serio_raw rfkill i2c_algo_bit tpm battery power_supply nvram wmi i2c_core tpm_bios soundcore snd_page_alloc button processor video ext4 mbcache jbd2 crc16 sha256_generic aesni_intel cryptd aes_x86_64 aes_generic cbc dm_crypt dm_mod sd_mod crc_t10dif ahci libahci ehci_hcd libata usbcore scsi_mod e1000e thermal thermal_sys [last unloaded: scsi_wait_scan]
[ 33.167207] Pid: 2279, comm: ebtables Not tainted 2.6.39-rc1+ #11
[ 33.169998] Call Trace:
[ 33.172814] [<ffffffff81041be9>] ? warn_slowpath_common+0x78/0x8c
[ 33.175723] [<ffffffffa04d7801>] ? xt_compat_calc_jump+0x6f/0x7a [x_tables]
[ 33.178549] [<ffffffffa0526d54>] ? compat_do_replace+0x125/0x22f [ebtables]
[ 33.181370] [<ffffffffa05273a0>] ? compat_do_ebt_set_ctl+0x55/0xb9 [ebtables]
[ 33.184240] [<ffffffff810337e3>] ? need_resched+0x1a/0x23
[ 33.187055] [<ffffffff810337f1>] ? should_resched+0x5/0x24
[ 33.189805] [<ffffffff81314d25>] ? _cond_resched+0x9/0x20
[ 33.192578] [<ffffffff8131535e>] ? mutex_lock_interruptible+0x18/0x32
[ 33.195385] [<ffffffff8128496b>] ? nf_sockopt_find.clone.1+0xda/0xec
[ 33.198093] [<ffffffff812849f6>] ? compat_nf_sockopt+0x79/0xa5
[ 33.200852] [<ffffffff810337f1>] ? should_resched+0x5/0x24
[ 33.203618] [<ffffffff81284a53>] ? compat_nf_setsockopt+0x1a/0x1f
[ 33.206291] [<ffffffff8128fb95>] ? compat_ip_setsockopt+0x80/0xa0
[ 33.209001] [<ffffffff81278502>] ? compat_sys_setsockopt+0x1d5/0x204
[ 33.211726] [<ffffffff810337f1>] ? should_resched+0x5/0x24
[ 33.214374] [<ffffffff81314d25>] ? _cond_resched+0x9/0x20
[ 33.217083] [<ffffffff81278905>] ? compat_sys_socketcall+0x148/0x1a7
[ 33.219811] [<ffffffff8131d340>] ? sysenter_dispatch+0x7/0x2e
[ 33.222433] ---[ end trace 96f8ae34f1f5ad81 ]---
-dann
> Thanks
>
> [PATCH] netfilter: fix ebtables
>
> commit 255d0dc34068a976 (netfilter: x_table: speedup compat operations)
> made ebtables not working anymore.
>
> 1) xt_compat_calc_jump() is not an exact match lookup, and
> 2) compat_table_info() has a typo in xt_compat_init_offsets() call
> 3) compat_do_replace() misses a xt_compat_init_offsets() call
>
> Reported-by: dann frazier <dannf@...nf.org>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> ---
> net/bridge/netfilter/ebtables.c | 3 ++-
> net/netfilter/x_tables.c | 3 +++
> 2 files changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
> index 893669c..c66aa80 100644
> --- a/net/bridge/netfilter/ebtables.c
> +++ b/net/bridge/netfilter/ebtables.c
> @@ -1766,7 +1766,7 @@ static int compat_table_info(const struct ebt_table_info *info,
>
> newinfo->entries_size = size;
>
> - xt_compat_init_offsets(AF_INET, info->nentries);
> + xt_compat_init_offsets(NFPROTO_BRIDGE, info->nentries /* + 4*/);
> return EBT_ENTRY_ITERATE(entries, size, compat_calc_entry, info,
> entries, newinfo);
> }
> @@ -2240,6 +2240,7 @@ static int compat_do_replace(struct net *net, void __user *user,
>
> xt_compat_lock(NFPROTO_BRIDGE);
>
> + xt_compat_init_offsets(NFPROTO_BRIDGE, tmp.nentries);
> ret = compat_copy_entries(entries_tmp, tmp.entries_size, &state);
> if (ret < 0)
> goto out_unlock;
> diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
> index a9adf4c..e6dbec5 100644
> --- a/net/netfilter/x_tables.c
> +++ b/net/netfilter/x_tables.c
> @@ -455,6 +455,7 @@ void xt_compat_flush_offsets(u_int8_t af)
> vfree(xt[af].compat_tab);
> xt[af].compat_tab = NULL;
> xt[af].number = 0;
> + xt[af].cur = 0;
> }
> }
> EXPORT_SYMBOL_GPL(xt_compat_flush_offsets);
> @@ -473,6 +474,8 @@ int xt_compat_calc_jump(u_int8_t af, unsigned int offset)
> else
> return mid ? tmp[mid - 1].delta : 0;
> }
> + if (left)
> + return tmp[left - 1].delta;
> WARN_ON_ONCE(1);
> return 0;
> }
>
>
--
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