On a vmware server system upgraded from F7-rawhide 20080412, experiencing the
following panic occasionally at boot:
BUG: unable to handle kernel NULL pointer dereference at 00000020
IP: [<c04bbb65>] sysfs_addrm_start+0x21/0x7d
Oops: 0000 [#1] SMP
Modules linked in: e1000(+) i2c_piix4 i2c_core sg ac button sr_mod cdrom
ata_piix libata dm_snapshot dm_zero dm_mirror dm_mod mptspi mptscsih mptbase
scsi_transport_spi sd_mod scsi_mod ext3 jbd mbcache uhci_hcd ohci_hcd ehci_hcd
[last unloaded: scsi_wait_scan]
Pid: 742, comm: mdadm Not tainted (2.6.25-0.218.rc8.git7.fc9.i686 #1)
EIP: 0060:[<c04bbb65>] EFLAGS: 00010246 CPU: 0
EIP is at sysfs_addrm_start+0x21/0x7d
EAX: c04bbc23 EBX: 00000000 ECX: 00000000 EDX: 00000062
ESI: f6ecdc84 EDI: f6ecdc94 EBP: f6ecdc78 ESP: f6ecdc6c
DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process mdadm (pid: 742, ti=f6ecd000 task=f6e22e80 task.ti=f6ecd000)
Stack: f6ecdc84 f6e75bd0 fffffff4 f6ecdca0 c04bbfb7 00000000 00000000 00000000
00000000 00000000 f7853dc4 fffffffe f7af6824 f6ecdcb4 c04bc01c f6ecdcac
c04f08f2 f7853dc4 f6ecdcd0 c04f09ec f7af6824 f6ecdcd0 00000000 f7853dc4
[<c04bbfb7>] ? create_dir+0x3a/0x72
[<c04bc01c>] ? sysfs_create_dir+0x2d/0x41
[<c04f08f2>] ? kobject_get+0x12/0x17
[<c04f09ec>] ? kobject_add_internal+0xa4/0x145
[<c04f0b21>] ? kobject_add_varg+0x35/0x41
[<c04f0b92>] ? kobject_add+0x43/0x49
[<c05948aa>] ? bind_rdev_to_array+0x124/0x1ab
[<c04cf900>] ? task_has_capability+0x47/0x76
[<c04f4f94>] ? copy_from_user+0x39/0x121
[<c05994d1>] ? md_ioctl+0xf75/0x183b
[<c04cfde2>] ? inode_has_perm+0x5b/0x65
[<c0490ce5>] ? d_free+0x3b/0x4d
[<c0492094>] ? dput+0x34/0xee
[<c04efb51>] ? _atomic_dec_and_lock+0x29/0x44
[<c04958b8>] ? mntput_no_expire+0x16/0x69
[<c0488796>] ? path_put+0x20/0x23
[<c048ab1b>] ? __link_path_walk+0xce7/0xcfc
[<c04e831d>] ? blkdev_driver_ioctl+0x49/0x5b
[<c04e8ab0>] ? blkdev_ioctl+0x781/0x79d
[<c04d06a8>] ? selinux_file_free_security+0x14/0x16
[<c04cfde2>] ? inode_has_perm+0x5b/0x65
[<c04d01b9>] ? file_has_perm+0x7c/0x85
[<c04a241b>] ? block_ioctl+0x16/0x1b
[<c04a2405>] ? block_ioctl+0x0/0x1b
[<c048c99e>] ? vfs_ioctl+0x22/0x69
[<c048cc1e>] ? do_vfs_ioctl+0x239/0x24c
[<c04d034f>] ? selinux_file_ioctl+0xa8/0xab
[<c048cc71>] ? sys_ioctl+0x40/0x5b
[<c0405cf6>] ? syscall_call+0x7/0xb
Code: 89 31 8d 65 f4 5b 5e 5f 5d c3 55 b9 04 00 00 00 89 e5 57 89 c7 56 89 c6 53
31 c0 89 d3 f3 ab b8 34 fc 71 c0 89 16 e8 1f e2 16 00 <8b> 53 20 b9 f0 b7 4b c0
a1 88 f4 83 c0 53 e8 43 71 fd ff 5f 85
EIP: [<c04bbb65>] sysfs_addrm_start+0x21/0x7d SS:ESP 0068:f6ecdc6c
---[ end trace ca143223eefdc828 ]---
It's interesting to note that this VM has been used for install testing, and
*does* have a valid RAID array that mdadm can find - however it's not used in
fstab on this installation.
Well, this isn't a panic per se - however, the system won't boot after it :)
Changing version to '9' as part of upcoming Fedora 9 GA.
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