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Date:	Fri, 05 Jun 2009 11:37:33 +1000
From:	Peter Chubb <peterc@...ato.unsw.edu.au>
To:	linux-kernel@...r.kernel.org
Subject: Oops with minicom and USB serial with Linux 2.6.30-rc8


A new kernel this morning.  Using a Prolific single-port serial
adapter to talk to a BeagleBoard.  I regularly get this when I hit the
Beagle's reset button.  I'm not sure I trust the traceback; I'll
rebuild with frame pointers and see if I can get a better one.


pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0
pl2303 7-2.1:1.0: device disconnected
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<c0118369>] __ticket_spin_lock+0x5/0x15
*pde = 00000000 
Oops: 0002 [#1] PREEMPT SMP 
last sysfs file: /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/rfkill/rfkill0/state
Modules linked in: ext2 mbcache nls_iso8859_1 nls_cp437 cdc_acm pl2303 usbserial kvm_intel kvm kqemu cpufreq_powersave cpufreq_userspace cpufreq_conservative snd_hda_codec_si3054 snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss uvcvideo snd_mixer_oss snd_pcm snd_timer snd iwlagn wmi soundcore snd_page_alloc ehci_hcd joydev uhci_hcd usbcore iwlcore

Pid: 7414, comm: minicom Not tainted (2.6.30-rc8 #17) HP Pavilion dv9700 Notebook PC    
EIP: 0060:[<c0118369>] EFLAGS: 00010002 CPU: 1
EIP is at __ticket_spin_lock+0x5/0x15
EAX: 00000000 EBX: 00000282 ECX: 00000000 EDX: 00000100
ESI: 00001d4c EDI: f5bd6600 EBP: f52ba5a0 ESP: f5139d68
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process minicom (pid: 7414, ti=f5138000 task=f50db480 task.ti=f5138000)
Stack:
 c01183c6 c0444a56 c01237ef 0001fcc4 00000000 f81c43a2 c20200c0 00000096
 f5486000 c2022484 00000001 f5139dc8 c01364a3 c0444d3c c0188630 f81c6554
 f5bd6600 f5486000 f52ba5a0 f8081708 f5133980 f5bd6658 f81c6978 f5486000
Call Trace:
 [<c01183c6>] ? default_spin_lock_flags+0x5/0x7
 [<c0444a56>] ? _spin_lock_irqsave+0x27/0x2e
 [<c01237ef>] ? try_to_wake_up+0x1b5/0x1bf
 [<f81c43a2>] ? pl2303_close+0x44/0x1af [pl2303]
 [<c01364a3>] ? autoremove_wake_function+0xd/0x2d
 [<c0444d3c>] ? _spin_unlock+0x5/0x1c
 [<c0188630>] ? fasync_helper+0xcc/0xde
 [<f8081708>] ? serial_close+0x7b/0x122 [usbserial]
 [<f8081cb0>] ? serial_open+0x1e1/0x1ed [usbserial]
 [<c02ccc0c>] ? tty_open+0x2b6/0x37e
 [<c0181442>] ? chrdev_open+0x15d/0x174
 [<c01812e5>] ? chrdev_open+0x0/0x174
 [<c017daec>] ? __dentry_open+0x132/0x221
 [<c017dc6c>] ? nameidata_to_filp+0x29/0x3c
 [<c01881d5>] ? do_filp_open+0x402/0x77b
 [<c0138823>] ? enqueue_hrtimer+0x5a/0x64
 [<c0138ef7>] ? __hrtimer_start_range_ns+0x1ff/0x20b
 [<c0138f10>] ? hrtimer_start+0xd/0x11
 [<c0444d3c>] ? _spin_unlock+0x5/0x1c
 [<c018f1d3>] ? alloc_fd+0xc3/0xcd
 [<c017d8e6>] ? do_sys_open+0x44/0xb9
 [<c017d99f>] ? sys_open+0x1e/0x23
 [<c0103157>] ? sysenter_do_call+0x12/0x2c
Code: 89 44 24 0c 89 da 89 f0 5b 5e e9 48 fd ff ff 89 4c 24 0c 89 5c 24 10 89 f1 5b 0f b7 d2 0f b6 c0 5e e9 29 fe ff ff ba 00 01 00 00 <f0> 66 0f c1 10 38 f2 74 06 f3 90 8a 10 eb f6 c3 53 89 c3 0f b7 
EIP: [<c0118369>] __ticket_spin_lock+0x5/0x15 SS:ESP 0068:f5139d68
CR2: 0000000000000000
---[ end trace c4902ecc24bb44b3 ]---
note: minicom[7414] exited with preempt_count 2
BUG: scheduling while atomic: minicom/7414/0x00000002
Modules linked in: ext2 mbcache nls_iso8859_1 nls_cp437 cdc_acm pl2303 usbserial kvm_intel kvm kqemu cpufreq_powersave cpufreq_userspace cpufreq_conservative snd_hda_codec_si3054 snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss uvcvideo snd_mixer_oss snd_pcm snd_timer snd iwlagn wmi soundcore snd_page_alloc ehci_hcd joydev uhci_hcd usbcore iwlcore
Pid: 7414, comm: minicom Tainted: G      D    2.6.30-rc8 #17
Call Trace:
 [<c0442cfa>] ? __schedule+0x7f/0x766
 [<c01506ef>] ? rcu_process_callbacks+0x33/0x39
 [<c012a791>] ? __do_softirq+0x12c/0x166
 [<c012a94b>] ? irq_exit+0x36/0x62
 [<c0112a16>] ? smp_apic_timer_interrupt+0x6c/0x76
 [<c0103afd>] ? apic_timer_interrupt+0x31/0x38
 [<c015007b>] ? cpu_quiet_msk+0x66/0x9d
 [<c011d618>] ? mutex_spin_on_owner+0x43/0x5a
 [<c0443a0e>] ? __mutex_lock_slowpath+0xae/0xfc
 [<c04438ef>] ? mutex_lock+0x10/0x1e
 [<f80816d8>] ? serial_close+0x4b/0x122 [usbserial]
 [<c02ca544>] ? tty_fasync+0xc9/0xd0
 [<c02cc4c2>] ? tty_release_dev+0x14c/0x3f1
 [<c016f0d2>] ? remove_vma+0x3e/0x43
 [<c017a9a0>] ? kmem_cache_free+0x66/0xbd
 [<c02cc776>] ? tty_release+0xf/0x18
 [<c017fd88>] ? __fput+0xa6/0x149
 [<c017d801>] ? filp_close+0x4e/0x54
 [<c0127d4d>] ? put_files_struct+0x60/0xa6
 [<c01290fb>] ? do_exit+0x193/0x584
 [<c04429b3>] ? printk+0xe/0x11
 [<c0105ed4>] ? oops_end+0x7d/0x80
 [<c0119620>] ? no_context+0x105/0x10e
 [<c011971f>] ? __bad_area_nosemaphore+0xf6/0xfe
 [<c011984f>] ? do_page_fault+0x0/0x1fd
 [<c0119731>] ? bad_area_nosemaphore+0xa/0xc
 [<c0444fb2>] ? error_code+0x7a/0x80
 [<c0118369>] ? __ticket_spin_lock+0x5/0x15
 [<c01183c6>] ? default_spin_lock_flags+0x5/0x7
 [<c0444a56>] ? _spin_lock_irqsave+0x27/0x2e
 [<c01237ef>] ? try_to_wake_up+0x1b5/0x1bf
 [<f81c43a2>] ? pl2303_close+0x44/0x1af [pl2303]
 [<c01364a3>] ? autoremove_wake_function+0xd/0x2d
 [<c0444d3c>] ? _spin_unlock+0x5/0x1c
 [<c0188630>] ? fasync_helper+0xcc/0xde
 [<f8081708>] ? serial_close+0x7b/0x122 [usbserial]
 [<c02cc4c2>] ? tty_release_dev+0x14c/0x3f1
 [<c01db6dc>] ? xattr_lookup_poison+0x3a/0x47
 [<c0444d3c>] ? _spin_unlock+0x5/0x1c
 [<c018c98b>] ? __d_lookup+0xca/0x111
 [<f8081682>] ? usb_serial_put+0x1c/0x27 [usbserial]
 [<f8081cb0>] ? serial_open+0x1e1/0x1ed [usbserial]
 [<c02ccc0c>] ? tty_open+0x2b6/0x37e
 [<c0181442>] ? chrdev_open+0x15d/0x174
 [<c01812e5>] ? chrdev_open+0x0/0x174
 [<c017daec>] ? __dentry_open+0x132/0x221
 [<c017dc6c>] ? nameidata_to_filp+0x29/0x3c
 [<c01881d5>] ? do_filp_open+0x402/0x77b
 [<c0138823>] ? enqueue_hrtimer+0x5a/0x64
 [<c0138ef7>] ? __hrtimer_start_range_ns+0x1ff/0x20b
 [<c0138f10>] ? hrtimer_start+0xd/0x11
 [<c0444d3c>] ? _spin_unlock+0x5/0x1c
 [<c018f1d3>] ? alloc_fd+0xc3/0xcd
 [<c017d8e6>] ? do_sys_open+0x44/0xb9
 [<c017d99f>] ? sys_open+0x1e/0x23
 [<c0103157>] ? sysenter_do_call+0x12/0x2c



--
Dr Peter Chubb                              peter DOT chubb AT nicta.com.au
http://www.ertos.nicta.com.au           ERTOS within National ICT Australia
           Kernel Engineering Group (KEG): Where Systems Brew.
--
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