Re: Imon module Oops and kernel hang

From: Andy Walls
Date: Sat Jul 16 2011 - 20:43:04 EST

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On Thu, 2011-07-14 at 12:41 +1000, Chris W wrote:
> On 14/07/11 08:11, Jarod Wilson wrote:
> > On Jul 13, 2011, at 1:42 AM, Chris W wrote:
> > Just noticed your report is for 2.6.39.x and 2.6.38.x only, but I'm
> > not aware of any relevant imon changes between 2.6.39 and 3.0.
>
> I just tried 3.0.0-rc7 with the same result (used defaults for new
> config items. I manually loaded both keymaps before imon. I looks like
> the mystery T889 has become a T886... compiler generated temporary name
> perhaps?
>
> > Looks like I'll probably have to give that a spin, since I'm not
> > seeing the problem here (I can also switch to an 0xffdc device, which
> > is actually handled a bit differently by the driver).
>
> I understand that the 0xffdc device covers a multitude of physical
> variants. Is there any information from the device itself that drives
> the selected keymap? If so, how do I extract it?
>
> Regards,
> Chris
>
>

This is an obviously repeatable NULL pointer dereference in
rc_g_keycode_from_table(). The faulting line of code in both cases
disasembles to:

1e: 8b 80 dc 00 00 00 mov 0xdc(%eax),%eax

%eax obviously holds the value 0 (NULL). But I'm having a hard time
telling to where exactly that line of assembly corresponds in
rc_g_keycode_from_table(). And I can't tell from the source which data
structure has something at offset 0xdc that gets derefernced early:
struct rc_dev or struct rc_map.

Could you provide the output of

$ locate rc-core.ko
$ objdump -d -l /blah/blah/drivers/media/rc/rc-core.ko

for the rc_g_keycode_from_table() function?

Regards,
Andy

> Jul 14 11:19:38 kepler BUG: unable to handle kernel
> Jul 14 11:19:38 kepler NULL pointer dereference
> Jul 14 11:19:38 kepler at 000000dc
> Jul 14 11:19:38 kepler IP:
> Jul 14 11:19:38 kepler [<f8f1949e>] rc_g_keycode_from_table+0x1e/0xe0
> [rc_core]
> Jul 14 11:19:38 kepler *pde = 00000000
> Jul 14 11:19:38 kepler
> Jul 14 11:19:38 kepler Oops: 0000 [#1]
> Jul 14 11:19:38 kepler PREEMPT
> Jul 14 11:19:38 kepler
> Jul 14 11:19:38 kepler Modules linked in:
> Jul 14 11:19:38 kepler imon(+)
> Jul 14 11:19:38 kepler rc_imon_pad
> Jul 14 11:19:38 kepler rc_imon_mce
> Jul 14 11:19:38 kepler netconsole
> Jul 14 11:19:38 kepler asb100
> Jul 14 11:19:38 kepler hwmon_vid
> Jul 14 11:19:38 kepler cx22702
> Jul 14 11:19:38 kepler dvb_pll
> Jul 14 11:19:38 kepler mt352
> Jul 14 11:19:38 kepler cx88_dvb
> Jul 14 11:19:38 kepler cx88_vp3054_i2c
> Jul 14 11:19:38 kepler videobuf_dvb
> Jul 14 11:19:38 kepler snd_via82xx
> Jul 14 11:19:38 kepler snd_ac97_codec
> Jul 14 11:19:38 kepler cx8800
> Jul 14 11:19:38 kepler cx8802
> Jul 14 11:19:38 kepler cx88xx
> Jul 14 11:19:38 kepler ac97_bus
> Jul 14 11:19:38 kepler snd_mpu401_uart
> Jul 14 11:19:38 kepler snd_rawmidi
> Jul 14 11:19:38 kepler b44
> Jul 14 11:19:38 kepler ssb
> Jul 14 11:19:38 kepler rc_core
> Jul 14 11:19:38 kepler i2c_algo_bit
> Jul 14 11:19:38 kepler mii
> Jul 14 11:19:38 kepler tveeprom
> Jul 14 11:19:38 kepler btcx_risc
> Jul 14 11:19:38 kepler i2c_viapro
> Jul 14 11:19:38 kepler videobuf_dma_sg
> Jul 14 11:19:38 kepler videobuf_core
> Jul 14 11:19:38 kepler [last unloaded: ir_nec_decoder]
> Jul 14 11:19:38 kepler
> Jul 14 11:19:38 kepler
> Jul 14 11:19:38 kepler Pid: 2885, comm: modprobe Not tainted 3.0.0-rc7 #1
> Jul 14 11:19:38 kepler System Manufacturer System Name
> Jul 14 11:19:38 kepler /A7V8X
> Jul 14 11:19:38 kepler
> Jul 14 11:19:38 kepler EIP: 0060:[<f8f1949e>] EFLAGS: 00010002 CPU: 0
> Jul 14 11:19:38 kepler EIP is at rc_g_keycode_from_table+0x1e/0xe0 [rc_core]
> Jul 14 11:19:38 kepler EAX: 00000000 EBX: f5610800 ECX: 00000008 EDX:
> 00000000
> Jul 14 11:19:38 kepler ESI: 00000000 EDI: 00000000 EBP: f7009e48 ESP:
> f7009e18
> Jul 14 11:19:38 kepler DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
> Jul 14 11:19:38 kepler Process modprobe (pid: 2885, ti=f7008000
> task=f708ada0 task.ti=f5706000)
> Jul 14 11:19:38 kepler Stack:
> Jul 14 11:19:38 kepler f71cc8c0
> Jul 14 11:19:38 kepler 00000082
> Jul 14 11:19:38 kepler 00000002
> Jul 14 11:19:38 kepler f7009e2c
> Jul 14 11:19:38 kepler c101eabb
> Jul 14 11:19:38 kepler f71cc8c0
> Jul 14 11:19:38 kepler 00000000
> Jul 14 11:19:38 kepler 00000086
> Jul 14 11:19:38 kepler
> Jul 14 11:19:38 kepler 00000086
> Jul 14 11:19:38 kepler f5610800
> Jul 14 11:19:38 kepler 00000000
> Jul 14 11:19:38 kepler 00000000
> Jul 14 11:19:38 kepler f7009e58
> Jul 14 11:19:38 kepler f87be59c
> Jul 14 11:19:38 kepler f5610800
> Jul 14 11:19:38 kepler f5610841
> Jul 14 11:19:38 kepler
> Jul 14 11:19:38 kepler f7009edc
> Jul 14 11:19:38 kepler f87be6dc
> Jul 14 11:19:38 kepler f68c00a4
> Jul 14 11:19:38 kepler f7009e6c
> Jul 14 11:19:38 kepler f68c5760
> Jul 14 11:19:38 kepler f7009e74
> Jul 14 11:19:38 kepler f68c00a4
> Jul 14 11:19:38 kepler f7009e98
> Jul 14 11:19:38 kepler
> Jul 14 11:19:38 kepler Call Trace:
> Jul 14 11:19:38 kepler [<c101eabb>] ? T.886+0x1b/0x30
> Jul 14 11:19:38 kepler [<f87be59c>] imon_remote_key_lookup+0x1c/0x70 [imon]
> Jul 14 11:19:38 kepler [<f87be6dc>] imon_incoming_packet+0x5c/0xe20 [imon]
> Jul 14 11:19:38 kepler [<c1259cc8>] ? atapi_qc_complete+0x58/0x2b0
> Jul 14 11:19:38 kepler [<c1251d23>] ? __ata_qc_complete+0x73/0x110
> Jul 14 11:19:38 kepler [<f87bf573>] usb_rx_callback_intf0+0x63/0x70 [imon]
> Jul 14 11:19:38 kepler [<c1275848>] usb_hcd_giveback_urb+0x48/0xb0
> Jul 14 11:19:38 kepler [<c128d29e>] uhci_giveback_urb+0x8e/0x220
> Jul 14 11:19:38 kepler [<c128d896>] uhci_scan_schedule+0x366/0x9e0
> Jul 14 11:19:38 kepler [<c12900e1>] uhci_irq+0x91/0x170
> Jul 14 11:19:38 kepler [<c1274961>] usb_hcd_irq+0x21/0x50
> Jul 14 11:19:38 kepler [<c1052a36>] handle_irq_event_percpu+0x36/0x140
> Jul 14 11:19:38 kepler [<c1016570>] ? __io_apic_modify_irq+0x80/0x90
> Jul 14 11:19:38 kepler [<c10548c0>] ? handle_edge_irq+0x100/0x100
> Jul 14 11:19:38 kepler [<c1052b72>] handle_irq_event+0x32/0x60
> Jul 14 11:19:38 kepler [<c1054905>] handle_fasteoi_irq+0x45/0xc0
> Jul 14 11:19:38 kepler <IRQ>
> Jul 14 11:19:38 kepler
> Jul 14 11:19:38 kepler [<c1003c8a>] ? do_IRQ+0x3a/0xb0
> Jul 14 11:19:38 kepler [<c1065c93>] ? zone_watermark_ok+0x23/0x30
> Jul 14 11:19:38 kepler [<c13ddf29>] ? common_interrupt+0x29/0x30
> Jul 14 11:19:38 kepler [<c11b3d3e>] ? mmx_clear_page+0x7e/0x120
> Jul 14 11:19:38 kepler [<c1068222>] ? get_page_from_freelist+0x1f2/0x480
> Jul 14 11:19:38 kepler [<c12206d3>] ? extract_buf+0x83/0xd0
> Jul 14 11:19:38 kepler [<c1068585>] ? __alloc_pages_nodemask+0xd5/0x5a0
> Jul 14 11:19:38 kepler [<c10802f5>] ? anon_vma_prepare+0xc5/0x150
> Jul 14 11:19:38 kepler [<c10782f0>] ? handle_pte_fault+0x440/0x590
> Jul 14 11:19:38 kepler [<c10b0a9d>] ? __find_get_block+0xad/0x1c0
> Jul 14 11:19:38 kepler [<c10787d4>] ? handle_mm_fault+0x74/0xb0
> Jul 14 11:19:38 kepler [<c10194a0>] ? mm_fault_error+0x130/0x130
> Jul 14 11:19:38 kepler [<c101959a>] ? do_page_fault+0xfa/0x3c0
> Jul 14 11:19:38 kepler [<c1065c93>] ? zone_watermark_ok+0x23/0x30
> Jul 14 11:19:38 kepler [<c10e8d35>] ? ext3fs_dirhash+0x115/0x240
> Jul 14 11:19:38 kepler [<c10e8ae0>] ? ext3_follow_link+0x20/0x20
> Jul 14 11:19:38 kepler [<c10194a0>] ? mm_fault_error+0x130/0x130
> Jul 14 11:19:38 kepler [<c13dd7c4>] ? error_code+0x58/0x60
> Jul 14 11:19:38 kepler [<c10194a0>] ? mm_fault_error+0x130/0x130
> Jul 14 11:19:38 kepler [<c1061f95>] ? file_read_actor+0x25/0xe0
> Jul 14 11:19:38 kepler [<c10623dc>] ? find_get_page+0x5c/0xa0
> Jul 14 11:19:38 kepler [<c106423e>] ? generic_file_aio_read+0x2be/0x720
> Jul 14 11:19:38 kepler [<c10a54d3>] ? mntput+0x13/0x30
> Jul 14 11:19:38 kepler [<c108af0c>] ? do_sync_read+0x9c/0xd0
> Jul 14 11:19:38 kepler [<c108afa3>] ? rw_verify_area+0x63/0x110
> Jul 14 11:19:38 kepler [<c108ba87>] ? vfs_read+0x97/0x140
> Jul 14 11:19:38 kepler [<c108ae70>] ? do_sync_write+0xd0/0xd0
> Jul 14 11:19:38 kepler [<c108bbed>] ? sys_read+0x3d/0x70
> Jul 14 11:19:38 kepler [<c13dda10>] ? sysenter_do_call+0x12/0x26
> Jul 14 11:19:38 kepler Code:
> Jul 14 11:19:38 kepler 8d
> Jul 14 11:19:38 kepler b6
> Jul 14 11:19:38 kepler 00
> Jul 14 11:19:38 kepler 00
> Jul 14 11:19:38 kepler 00
> Jul 14 11:19:38 kepler 00
> Jul 14 11:19:38 kepler 8d
> Jul 14 11:19:38 kepler bc
> Jul 14 11:19:38 kepler 27
> Jul 14 11:19:38 kepler 00
> Jul 14 11:19:38 kepler 00
> Jul 14 11:19:38 kepler 00
> Jul 14 11:19:38 kepler 00
> Jul 14 11:19:38 kepler 55
> Jul 14 11:19:38 kepler 89
> Jul 14 11:19:38 kepler e5
> Jul 14 11:19:38 kepler 57
> Jul 14 11:19:38 kepler 56
> Jul 14 11:19:38 kepler 53
> Jul 14 11:19:38 kepler 83
> Jul 14 11:19:38 kepler ec
> Jul 14 11:19:38 kepler 24
> Jul 14 11:19:38 kepler 89
> Jul 14 11:19:38 kepler 45
> Jul 14 11:19:38 kepler e8
> Jul 14 11:19:38 kepler 9c
> Jul 14 11:19:38 kepler 8f
> Jul 14 11:19:38 kepler 45
> Jul 14 11:19:38 kepler ec
> Jul 14 11:19:38 kepler fa
> Jul 14 11:19:38 kepler 89
> Jul 14 11:19:38 kepler e0
> Jul 14 11:19:38 kepler 25
> Jul 14 11:19:38 kepler 00
> Jul 14 11:19:38 kepler e0
> Jul 14 11:19:38 kepler ff
> Jul 14 11:19:38 kepler ff
> Jul 14 11:19:38 kepler ff
> Jul 14 11:19:38 kepler 40
> Jul 14 11:19:38 kepler 14
> Jul 14 11:19:38 kepler 8b
> Jul 14 11:19:38 kepler 45
> Jul 14 11:19:38 kepler e8
> Jul 14 11:19:38 kepler syslog-ng[1931]: Error processing log message: <8b>
> Jul 14 11:19:38 kepler 80
> Jul 14 11:19:38 kepler dc
> Jul 14 11:19:38 kepler 00
> Jul 14 11:19:38 kepler 00
> Jul 14 11:19:38 kepler 00
> Jul 14 11:19:38 kepler 89
> Jul 14 11:19:38 kepler c3
> Jul 14 11:19:38 kepler 89
> Jul 14 11:19:38 kepler 45
> Jul 14 11:19:38 kepler f0
> Jul 14 11:19:38 kepler 4b
> Jul 14 11:19:38 kepler 78
> Jul 14 11:19:38 kepler 38
> Jul 14 11:19:38 kepler 8b
> Jul 14 11:19:38 kepler 45
> Jul 14 11:19:38 kepler e8
> Jul 14 11:19:38 kepler 31
> Jul 14 11:19:38 kepler c9
> Jul 14 11:19:38 kepler 8b
> Jul 14 11:19:38 kepler b0
> Jul 14 11:19:38 kepler
> Jul 14 11:19:38 kepler EIP: [<f8f1949e>]
> Jul 14 11:19:38 kepler rc_g_keycode_from_table+0x1e/0xe0 [rc_core]
> Jul 14 11:19:38 kepler SS:ESP 0068:f7009e18
> Jul 14 11:19:38 kepler CR2: 00000000000000dc
> Jul 14 11:19:38 kepler ---[ end trace 7467312b172b0d0f ]---
> Jul 14 11:19:38 kepler Kernel panic - not syncing: Fatal exception in
> interrupt
> Jul 14 11:19:38 kepler Pid: 2885, comm: modprobe Tainted: G D
> 3.0.0-rc7 #1
> Jul 14 11:19:38 kepler Call Trace:
> Jul 14 11:19:38 kepler [<c13db3a7>] panic+0x61/0x145
> Jul 14 11:19:38 kepler [<c1004f30>] oops_end+0x80/0x80
> Jul 14 11:19:38 kepler [<c101910e>] no_context+0xbe/0x150
> Jul 14 11:19:38 kepler [<c101922f>] __bad_area_nosemaphore+0x8f/0x130
> Jul 14 11:19:38 kepler [<c10194a0>] ? mm_fault_error+0x130/0x130
> Jul 14 11:19:38 kepler [<c10192e2>] bad_area_nosemaphore+0x12/0x20
> Jul 14 11:19:38 kepler [<c1019709>] do_page_fault+0x269/0x3c0
> Jul 14 11:19:38 kepler [<c1040d85>] ? T.314+0x15/0x1b0
> Jul 14 11:19:38 kepler [<c10194a0>] ? mm_fault_error+0x130/0x130
> Jul 14 11:19:38 kepler [<c13dd7c4>] error_code+0x58/0x60
> Jul 14 11:19:38 kepler [<c10194a0>] ? mm_fault_error+0x130/0x130
> Jul 14 11:19:38 kepler [<f8f1949e>] ? rc_g_keycode_from_table+0x1e/0xe0
> [rc_core]
> Jul 14 11:19:38 kepler [<c101eabb>] ? T.886+0x1b/0x30
> Jul 14 11:19:38 kepler [<f87be59c>] imon_remote_key_lookup+0x1c/0x70 [imon]
> Jul 14 11:19:38 kepler [<f87be6dc>] imon_incoming_packet+0x5c/0xe20 [imon]
> Jul 14 11:19:38 kepler [<c1259cc8>] ? atapi_qc_complete+0x58/0x2b0
> Jul 14 11:19:38 kepler [<c1251d23>] ? __ata_qc_complete+0x73/0x110
> Jul 14 11:19:38 kepler [<f87bf573>] usb_rx_callback_intf0+0x63/0x70 [imon]
> Jul 14 11:19:38 kepler [<c1275848>] usb_hcd_giveback_urb+0x48/0xb0
> Jul 14 11:19:38 kepler [<c128d29e>] uhci_giveback_urb+0x8e/0x220
> Jul 14 11:19:38 kepler [<c128d896>] uhci_scan_schedule+0x366/0x9e0
> Jul 14 11:19:38 kepler [<c12900e1>] uhci_irq+0x91/0x170
> Jul 14 11:19:38 kepler [<c1274961>] usb_hcd_irq+0x21/0x50
> Jul 14 11:19:38 kepler [<c1052a36>] handle_irq_event_percpu+0x36/0x140
> Jul 14 11:19:38 kepler [<c1016570>] ? __io_apic_modify_irq+0x80/0x90
> Jul 14 11:19:38 kepler [<c10548c0>] ? handle_edge_irq+0x100/0x100
> Jul 14 11:19:38 kepler [<c1052b72>] handle_irq_event+0x32/0x60
> Jul 14 11:19:38 kepler [<c1054905>] handle_fasteoi_irq+0x45/0xc0
> Jul 14 11:19:38 kepler <IRQ>
> Jul 14 11:19:38 kepler [<c1003c8a>] ? do_IRQ+0x3a/0xb0
> Jul 14 11:19:38 kepler [<c1065c93>] ? zone_watermark_ok+0x23/0x30
> Jul 14 11:19:38 kepler [<c13ddf29>] ? common_interrupt+0x29/0x30
> Jul 14 11:19:38 kepler [<c11b3d3e>] ? mmx_clear_page+0x7e/0x120
> Jul 14 11:19:38 kepler [<c1068222>] ? get_page_from_freelist+0x1f2/0x480
> Jul 14 11:19:38 kepler [<c12206d3>] ? extract_buf+0x83/0xd0
> Jul 14 11:19:38 kepler [<c1068585>] ? __alloc_pages_nodemask+0xd5/0x5a0
> Jul 14 11:19:38 kepler [<c10802f5>] ? anon_vma_prep
> Jul 14 11:19:38 kepler are+0xc5/0x150
> Jul 14 11:19:38 kepler [<c10782f0>] ? handle_pte_fault+0x440/0x590
> Jul 14 11:19:38 kepler [<c10b0a9d>] ? __find_get_block+0xad/0x1c0
> Jul 14 11:19:38 kepler [<c10787d4>] ? handle_mm_fault+0x74/0xb0
> Jul 14 11:19:38 kepler [<c10194a0>] ? mm_fault_error+0x130/0x130
> Jul 14 11:19:38 kepler [<c101959a>] ? do_page_fault+0xfa/0x3c0
> Jul 14 11:19:38 kepler [<c1065c93>] ? zone_watermark_ok+0x23/0x30
> Jul 14 11:19:38 kepler [<c10e8d35>] ? ext3fs_dirhash+0x115/0x240
> Jul 14 11:19:38 kepler [<c10e8ae0>] ? ext3_follow_link+0x20/0x20
> Jul 14 11:19:38 kepler [<c10194a0>] ? mm_fault_error+0x130/0x130
> Jul 14 11:19:38 kepler [<c13dd7c4>] ? error_code+0x58/0x60
> Jul 14 11:19:38 kepler [<c10194a0>] ? mm_fault_error+0x130/0x130
> Jul 14 11:19:38 kepler [<c1061f95>] ? file_read_actor+0x25/0xe0
> Jul 14 11:19:38 kepler [<c10623dc>] ? find_get_page+0x5c/0xa0
> Jul 14 11:19:38 kepler [<c106423e>] ? generic_file_aio_read+0x2be/0x720
> Jul 14 11:19:38 kepler [<c10a54d3>] ? mntput+0x13/0x30
> Jul 14 11:19:38 kepler [<c108af0c>] ? do_sync_read+0x9c/0xd0
> Jul 14 11:19:38 kepler [<c108afa3>] ? rw_verify_area+0x63/0x110
> Jul 14 11:19:38 kepler [<c108ba87>] ? vfs_read+0x97/0x140
> Jul 14 11:19:38 kepler [<c108ae70>] ? do_sync_write+0xd0/0xd0
> Jul 14 11:19:38 kepler [<c108bbed>] ? sys_read+0x3d/0x70
> Jul 14 11:19:38 kepler [<c13dda10>] ? sysenter_do_call+0x12/0x26
>

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Next message: Anton Blanchard: "vfsmount lock issues on very large ppc64 box"
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