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SubjectRe: NULL pointer dereference in sysfs_hash_and_remove()
Hi Martin,

Here the dentry corresponding to the attribute subgroup seems to
be a negative dentry. We are ethier reomving the group more
than once or removing a non-existing attribute group. I suspect the
first thing more. Can you rebuild the kernel with DEBUG defined in
fs/sysfs/dir.c and retest?. And send the dmesg log.

Thanks
Maneesh

On Fri, Oct 03, 2003 at 10:42:39PM +0000, Martin Josefsson wrote:
> Hi
> I compiled 2.6.0-test6 and ran it on a laptop with cardbus.
> I have an Xircom NIC and if I remove it during operation I get the bug
> below.
>
> I have yenta_socket and xircom_cb loaded as modules.
>
>
> Unable to handle kernel NULL pointer dereference at virtual address 00000068
> printing eip:
> c017cd75
> *pde = 0df96067
> *pte = 00000000
> Oops: 0002 [#1]
> CPU: 0
> EIP: 0060:[<c017cd75>] Not tainted
> EFLAGS: 00010282
> EIP is at sysfs_hash_and_remove+0x15/0x7d
> eax: 00000000 ebx: c03109e4 ecx: 00000068 edx: ccf13dd0
> esi: ccf13d60 edi: c03106e4 ebp: cea5c454 esp: cd0ede54
> ds: 007b es: 007b ss: 0068
> Process pccardd (pid: 528, threadinfo=cd0ec000 task=ce1c8740)
> Stack: c017cd55 cd0ede60 c03109e4 ccf13d60 c017e231 ccf13d60 c02c390f ccf13d60
> c0310a40 c017e368 ccf13d60 c0310a40 cfc2dc00 cfc2dd90 c023e937 cfc2dd98
> c0310a40 cfc2dc00 cd0edeb4 c023b99a cfc2dc00 00000006 cfc2dc00 00000282
> Call Trace:
> [<c017cd55>] sysfs_get_dentry+0x65/0x70
> [<c017e231>] remove_files+0x31/0x40
> [<c017e368>] sysfs_remove_group+0x28/0x70
> [<c023e937>] netdev_unregister_sysfs+0x67/0x70
> [<c023b99a>] netdev_run_todo+0xea/0x1f0
> [<d086738c>] xircom_remove+0xac/0xd0 [xircom_cb]
> [<c01a9deb>] pci_device_remove+0x3b/0x40
> [<c01e9316>] device_release_driver+0x66/0x70
> [<c01e9455>] bus_remove_device+0x55/0xa0
> [<c01e81bd>] device_del+0x5d/0xa0
> [<c01e8213>] device_unregister+0x13/0x30
> [<c01a740e>] pci_destroy_dev+0x1e/0x70
> [<c01a752b>] pci_remove_behind_bridge+0x2b/0x40
> [<c0221b48>] shutdown_socket+0x88/0x120
> [<c0222263>] socket_remove+0x13/0x50
> [<c022230a>] socket_detect_change+0x6a/0x90
> [<c02224c8>] pccardd+0x198/0x220
> [<c011a980>] default_wake_function+0x0/0x30
> [<c011a980>] default_wake_function+0x0/0x30
> [<c0222330>] pccardd+0x0/0x220
> [<c01092a5>] kernel_thread_helper+0x5/0x10
>
> Code: ff 48 68 78 63 89 34 24 8b 44 24 18 89 44 24 04 e8 66 ff ff
>
> --
> /Martin
> -
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--
Maneesh Soni
Linux Technology Center,
IBM Software Lab, Bangalore, India
email: maneesh@in.ibm.com
Phone: 91-80-5044999 Fax: 91-80-5268553
T/L : 9243696
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