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On Wed, 11 Feb 2009 23:43:44 +0100 (CET)
Thomas Gleixner <tglx@tglx.de> wrote:

quoted text
> After a 1.5 years sabbatical from preempt-rt we are pleased to
> announce a refactored preempt-rt patch against linux-2.6.29-rc4.


Hi Thomas, 

I got the following after booting on my T60:

- ------------[ cut here ]------------
WARNING: at crypto/blkcipher.c:327 blkcipher_walk_first+0x72/0x1aa()
Hardware name:
Modules linked in: fuse i915 drm i2c_algo_bit cfbcopyarea cfbimgblt cfbfillrect autofs4 coretemp sunrpc nf_conntrack_netbios_ns xt_state ipt_REJECT iptable_filter ip_tables cpufreq_ondemand dm_multipath scsi_dh uinput btusb bluetooth sg snd_hda_codec_analog snd_hda_intel snd_hda_codec iwl3945 snd_hwdep e1000e lib80211 snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss video snd_mixer_oss snd_pcm snd_timer snd soundcore snd_page_alloc i2c_i801 i2c_core thinkpad_acpi rfkill output iTCO_wdt iTCO_vendor_support button joydev hwmon dm_snapshot dm_zero dm_mirror dm_region_hash dm_log uhci_hcd ohci_hcd ehci_hcd [last unloaded: microcode]
Pid: 9, comm: sirq-tasklet/0 Not tainted 2.6.29-rc4-rt1-tip #50
Call Trace:
 [<ffffffff8023bd23>] warn_slowpath+0xaf/0xd6
 [<ffffffff8035d176>] blkcipher_walk_first+0x72/0x1aa
 [<ffffffff802309cb>] ? enqueue_task_fair+0x25/0x68
 [<ffffffff8035d2f6>] blkcipher_walk_virt+0x1a/0x1c
 [<ffffffff803620af>] crypto_ecb_crypt+0x2b/0x9a
 [<ffffffff80359d20>] ? setkey+0xc4/0xd8
 [<ffffffff8036426a>] ? arc4_crypt+0x0/0x5e
 [<ffffffff8036214f>] crypto_ecb_decrypt+0x31/0x33
 [<ffffffff8035c8fb>] ? setkey+0xba/0xcd
 [<ffffffff8022bf8f>] ? __wake_up_common+0x49/0x7f
 [<ffffffff80519beb>] ieee80211_wep_decrypt_data+0x5e/0x95
 [<ffffffff80519d3a>] ieee80211_wep_decrypt+0x118/0x16f
 [<ffffffff80519ddc>] ieee80211_crypto_wep_decrypt+0x4b/0x93
 [<ffffffff80524d8f>] ieee80211_invoke_rx_handlers+0x26b/0x1395
 [<ffffffff8021ce0f>] ? native_smp_send_reschedule+0x59/0x5b
 [<ffffffff8022c699>] ? resched_task+0x60/0x62
 [<ffffffff802367a9>] ? try_to_wake_up+0x352/0x364
 [<ffffffff802367ca>] ? default_wake_function+0xf/0x11
 [<ffffffff80526418>] __ieee80211_rx_handle_packet+0x55f/0x59c
 [<ffffffff80526c82>] __ieee80211_rx+0x508/0x572
 [<ffffffff80517451>] ieee80211_tasklet_handler+0x6d/0xff
 [<ffffffff80241192>] __tasklet_action+0xa1/0x112
 [<ffffffff80241277>] tasklet_action+0x39/0x3b
 [<ffffffff80240eef>] ksoftirqd+0x162/0x278
 [<ffffffff80240d8d>] ? ksoftirqd+0x0/0x278
 [<ffffffff80240d8d>] ? ksoftirqd+0x0/0x278
 [<ffffffff8024f5ce>] kthread+0x48/0x73
 [<ffffffff8020cf6a>] child_rip+0xa/0x20
 [<ffffffff8024f586>] ? kthread+0x0/0x73
 [<ffffffff8020cf60>] ? child_rip+0x0/0x20
- ---[ end trace b6a0ff9dfe960c5e ]---

It booted to runlevel 5, brought up GDM, I logged in and XFCE came up
fine. It wasn't until NetworkManager started dorking around with the
802.11 adapter and started doing WEP things that I got the above
warning. Right after I got this, NetworkManager connected and the
system locked up. Sorry, no traceback from the panic.

I haven't gone far in looking at this, but it looks like we might have
to adjust expectations in the crypto code, since it's probably ok to
be in_irq() in this case, since we're actually in a kthread.

I've attached my config and the dmesg output.

Clark

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