Disable CONFIG_GPROF. You are running UML in TT mode, and there GPROF
doesn't
work (and later kernels, in fact, refuse this config in the menuconfig
settings).
Note that using SKAS0 mode (i.e. guest version >= 2.6.13) would give you
something much faster.
Thank you very much.
Now I just compiled a new uml image with kernel version 2.6.13.3, this time
I got a new problem that root fs cannot be mounted.
The following is the error message. I got a "Kernel panic - not syncing:
VFS: Unable to mount root fs on unknown-block(98,0)" error. Do you have any
idea?
./linux stderr=1 ubd0=root_fs.rh-7.2-server.pristine.20020312
Checking for /proc/mm...not found
Checking for the skas3 patch in the host...not found
UML running in SKAS0 mode
Checking PROT_EXEC mmap in /tmp...OK
Linux version 2.6.13.3 ([EMAIL PROTECTED]) (gcc version 3.2.2 20030222 (Red Hat
Linux 3.2.2-5)) #2 Thu Oct 6 13:42:16 MDT 2005
Built 1 zonelists
Kernel command line: stderr=1 ubd0=root_fs.rh-7.2-server.pristine.20020312
root=98:0
PID hash table entries: 256 (order: 8, 4096 bytes)
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 29176k available
Mount-cache hash table entries: 512
Checking for host processor cmov support...Yes
Checking for host processor xmm support...No
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...missing
Checking that host ptys support output SIGIO...Yes
Checking that host ptys support SIGIO on close...No, enabling workaround
Checking for /dev/anon on the host...Not available (open failed with errno
2)
NET: Registered protocol family 16
mconsole (version 2) initialized on /home/yotta/ktan/.uml/Eu1swU/mconsole
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
md: md driver 0.90.2 MAX_MD_DEVS=256, MD_SB_DISKS=27
md: bitmap version 3.38
NET: Registered protocol family 2
IP route cache hash table entries: 512 (order: -1, 2048 bytes)
TCP established hash table entries: 2048 (order: 2, 16384 bytes)
TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
TCP reno registered
TCP bic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
NET: Registered protocol family 8
NET: Registered protocol family 20
Initialized stdio console driver
md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
VFS: Cannot open root device "98:0" or unknown-block(98,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-block(98,0)
EIP: 0023:[<a0155d91>] CPU: 0 Not tainted ESP: 002b:40001fb4 EFLAGS:
00200206
Not tainted
EAX: 00000000 EBX: 000044fc ECX: 00000013 EDX: 000044fc
ESI: 000044fb EDI: 00000000 EBP: 00000000 DS: 002b ES: 002b
a02f3b40: [<a0049b32>] notifier_call_chain+0x1e/0x38
a02f3b60: [<a00390ad>] panic+0x55/0xfc
a02f3b80: [<a0001959>] mount_block_root+0x91/0xf4
a02f3bb0: [<a0075661>] sys_close+0x51/0x64
a02f3bd0: [<a0001aed>] mount_root+0x51/0x58
a02f3be0: [<a0001ba3>] prepare_namespace+0xaf/0x120
a02f3bf0: [<a0001b3f>] prepare_namespace+0x4b/0x120
a02f3bf8: [<a000f18c>] init+0x0/0x10c
a02f3c00: [<a000f291>] init+0x105/0x10c
a02f3c10: [<a0012305>] run_kernel_thread+0x45/0x4c
a02f3c28: [<a000f18c>] init+0x0/0x10c
a02f3c38: [<a00122e0>] run_kernel_thread+0x20/0x4c
a02f3c90: [<a0014686>] unblock_signals+0xa/0x10
a02f3cb0: [<a003586c>] schedule_tail+0x24/0x178
a02f3cd4: [<a000f18c>] init+0x0/0x10c
a02f3ce0: [<a001b462>] new_thread_handler+0xc2/0x11c
a02f3ce4: [<a000f18c>] init+0x0/0x10c
a02f3d20: [<a0155b28>] __restore+0x0/0x8
a02f3d60: [<a0155d91>] kill+0x11/0x20
actually_do_remove : couldn't rmdir '/home/yotta/ktan/.uml/Eu1swU', errno =
39
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