Date:	Fri, 01 Apr 2011 15:42:08 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: GPF in __call_for_each_cic

On 2011-04-01 00:30, Dave Jones wrote:
> Just hit this on current git head.
> 
> 	Dave
> 
>  general protection fault: 0000 [#1] SMP 
>  last sysfs file: /sys/devices/system/cpu/cpu1/cache/index2/shared_cpu_map
>  CPU 0 
>  Modules linked in: cmtp kernelcapi can_bcm rfcomm sctp libcrc32c hidp bnep af_802154 ipx p8022 p8023 rds phonet decnet pppoe pppox ppp_generic slhc appletalk psnap llc af_key can rose ax25 irda crc_ccitt atm tun tcp_lp nfs fscache fuse nfsd lockd nfs_acl auth_rpcgss sunrpc cpufreq_ondemand acpi_cpufreq freq_table mperf ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables ipv6 uinput arc4 iwlagn mac80211 snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_intel snd_usb_audio snd_hda_codec btusb bluetooth snd_seq uvcvideo snd_pcm dell_wmi cfg80211 sparse_keymap snd_hwdep zaurus snd_usbmidi_lib videodev dell_laptop snd_rawmidi snd_timer cdc_ether dcdbas snd_seq_device usbnet microcode v4l2_compat_ioctl32 mii cdc_acm snd cdc_wdm iTCO_wdt joydev tg3 rfkill i2c_i801 pcspkr iTCO_vendor_support soundcore snd_page_alloc wmi i915 drm_kms_helper drm i2c_algo_bit i2c_core video [last unloaded: scsi_wait_scan]
>  
>  Pid: 14365, comm: trinity Not tainted 2.6.38-09065-g89078d5-dirty #6 Dell Inc. Adamo 13   /0N70T0
>  RIP: 0010:[<ffffffff8125703b>]  [<ffffffff8125703b>] __call_for_each_cic+0x32/0x51
>  RSP: 0018:ffff880007c05e28  EFLAGS: 00010202
>  RAX: 0000000000000001 RBX: ffff88010e48abd0 RCX: 0000042c0d869707
>  RDX: 0000000000000246 RSI: ffffffff81a268f0 RDI: 0000000000000246
>  RBP: ffff880007c05e48 R08: 0000000000000286 R09: 0000000000000001
>  R10: ffff88010e48abf8 R11: ffffffff8125893b R12: ffffffff8125708a
>  R13: 6b6b6b6b6b6b6b6b R14: ffff880007c05c08 R15: 0000000000000001
>  FS:  0000000000000000(0000) GS:ffff88013fa00000(0000) knlGS:0000000000000000
>  CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
>  CR2: 000000000157ea88 CR3: 0000000001a03000 CR4: 00000000000406f0
>  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>  DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
>  Process trinity (pid: 14365, threadinfo ffff880007c04000, task ffff88007c99a3b0)
>  Stack:
>   ffff880007c05c08 ffff88010e48abd0 ffff88007c99a3b0 ffff88007c99a980
>   ffff880007c05e58 ffffffff8125706f ffff880007c05e78 ffffffff8124c70c
>   ffff880007c05e78 ffff88010e48abd0 ffff880007c05ea8 ffffffff8124c798
>  Call Trace:
>   [<ffffffff8125706f>] cfq_free_io_context+0x15/0x17
>   [<ffffffff8124c70c>] put_io_context+0x44/0x61
>   [<ffffffff8124c798>] exit_io_context+0x6f/0x77
>   [<ffffffff8105e9c6>] do_exit+0x759/0x780
>   [<ffffffff814cdaf7>] ? schedule+0x6d9/0x70b
>   [<ffffffff8105ec67>] do_group_exit+0x88/0xb6
>   [<ffffffff8105ecac>] sys_exit_group+0x17/0x1b
>   [<ffffffff814d6bc2>] system_call_fastpath+0x16/0x1b
>  Code: 54 53 48 83 ec 08 0f 1f 44 00 00 4c 8b af 80 00 00 00 48 89 fb 49 89 f4 e8 e3 db e1 ff 85 c0 74 05 e8 ac ff ff ff 4d 85 ed 74 17 
>   8b 45 00 49 8d 75 b0 48 89 df 0f 18 08 41 ff d4 4d 8b 6d 00 
>  RIP  [<ffffffff8125703b>] __call_for_each_cic+0x32/0x51
>   RSP <ffff880007c05e28>
>  ---[ end trace 044e02f5767b491a ]---
>  Fixing recursive fault but reboot is needed!

This looks like the ellusive cic bug that has never been fixed and
strikes once in a blue moon. What was the system doing?


-- 
Jens Axboe

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