Sandeep Kumar wrote:
Hi all, I got the following error insidea kernel module.
My module made a call to the blkdev_get ( ) inside the module and I
get the following error.
I also checked the line from fs/inode.c line number 1139 :
Its BUG_ON(inode->i_state == I_CLEAR);
What can be the possible reason for this assertion to hold true.
Kindly help.
Nov 22 17:54:34 localhost kernel: ------------[ cut here ]------------
Nov 22 17:54:34 localhost kernel: kernel BUG at fs/inode.c:1139!
Nov 22 17:54:34 localhost kernel: invalid opcode: 0000 [#1]
Nov 22 17:54:34 localhost kernel: Modules linked in: dm_cdp
parport_pc lp parport autofs4 rfcomm l2cap bluetooth sunrpc dm_mod
video button battery asus_acpi ac ipv6 uhci_hcd shpchp i2c_piix4
i2c_core snd_ens1371 gameport snd_rawmidi snd_ac97_codec snd_ac97_bus
snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device
snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd soundcore
snd_page_alloc pcnet32 mii floppy ext3 jbd BusLogic sd_mod scsi_mod
Nov 22 17:54:34 localhost kernel: CPU: 0
Nov 22 17:54:34 localhost kernel: EIP: 0060:[<c016507d>]
Tainted: P VLI
Nov 22 17:54:34 localhost kernel: EFLAGS: 00010246 (2.6.18 #1)
Nov 22 17:54:34 localhost kernel: EIP is at iput+0x19/0x66
Nov 22 17:54:34 localhost kernel: eax: c032df20 ebx: cb7359c4
ecx: d0970798 edx: c116e6a0
Nov 22 17:54:34 localhost kernel: esi: c0ec5ec0 edi: 00000300
ebp: 00000000 esp: ca33de78
Nov 22 17:54:34 localhost kernel: ds: 007b es: 007b ss: 0068
Nov 22 17:54:34 localhost kernel: Process a.out (pid: 29096,
ti=ca33d000 task=c533c0f0 task.ti=ca33d000)
Nov 22 17:54:34 localhost kernel: Stack: cb735940 d097039b c0ec5ec0
ca33de98 c0ec5ec4 00000006 d09705a2 00316764
Nov 22 17:54:34 localhost kernel: 00768e2c 0083b5e0 00768e2c
0083b740 b7ff2000 00000009 0083aff4 00000000
Nov 22 17:54:34 localhost kernel: b7ff32ac b7ff63e0 00711fb4
007126d0 08048218 bfb8acf0 007046d8 00712878
Nov 22 17:54:34 localhost kernel: Call Trace:
Nov 22 17:54:34 localhost kernel: [<d097039b>]
get_dev_info+0x72/0x150 [dm_cdp]
Nov 22 17:54:34 localhost kernel: [<d09705a2>] cdp_ioctl+0x129/0x28e
[dm_cdp]
Nov 22 17:54:34 localhost kernel: [<c019e6b4>] file_has_perm+0x7f/0x88
Nov 22 17:54:34 localhost kernel: [<d0970479>] cdp_ioctl+0x0/0x28e
[dm_cdp]
Nov 22 17:54:34 localhost kernel: [<c015fb29>] do_ioctl+0x39/0x48
Nov 22 17:54:34 localhost kernel: [<c015fd32>] vfs_ioctl+0x1fa/0x211
Nov 22 17:54:34 localhost kernel: [<c015fd8f>] sys_ioctl+0x46/0x5f
Nov 22 17:54:34 localhost kernel: [<c0102b33>] syscall_call+0x7/0xb
Nov 22 17:54:34 localhost kernel: Code: 04 89 33 89 5e 04 b8 d8 e2 32
c0 5b 5e e9 49 6b 16 00 53 89 c3 85 c0 74 5d 8b 80 c0 00 00 00 8b 40
20 83 bb 90 01 00 00 20 75 08 <0f> 0b 73 04 2f aa 2e c0 85 c0 74 0b 8b
50 14 85 d2 74 04 89 d8
Nov 22 17:54:34 localhost kernel: EIP: [<c016507d>] iput+0x19/0x66
SS:ESP 0068:ca33de78
Nov 22 17:55:50 localhost gpm[1997]: *** info [client.c(137)]:
I guess maybe it is because of doing more times inode_put, I suggest
you Monitor the value of i_state to see where happen the wrong get or put.
BR
lyb
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