Re: [uml-user] F_SETLK failed, file already locked by pid 0

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Thanks for your reply.

I do see some zombies in my setup but I don't think they are related to this.

 u1234-lnx linux-2.6.28$ ps aux | grep Z
USER       PID %CPU %MEM   VSZ  RSS TTY      STAT START   TIME COMMAND
user222   9400  0.0  0.0     0    0 ?        Zs   13:46   0:00 [telnet] <defunct>
user222   9438  0.0  0.0     0    0 ?        Zs   13:47   0:00 [telnet] <defunct>
user222   9495  0.0  0.0     0    0 ?        Zs   13:51   0:00 [telnet] <defunct>
u1234    10464  0.0  0.0  3828  664 pts/9    S+   15:54   0:00 grep Z
u1234-lnx linux-2.6.28$
u1234-lnx linux-2.6.28$
u1234-lnx linux-2.6.28$
u1234-lnx linux-2.6.28$ ./linux mem=128M ubda=../bulk_fedora/root_fs
Locating the bottom of the address space ... 0x0
Locating the top of the address space ... 0xc0000000
Core dump limits :
        soft - 0
        hard - NONE
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...missing
Checking for tmpfs mount on /dev/shm...OK
Checking PROT_EXEC mmap in /dev/shm/...OK
Checking for the skas3 patch in the host:
  - /proc/mm...not found: No such file or directory
  - PTRACE_FAULTINFO...not found
  - PTRACE_LDT...not found
UML running in SKAS0 mode
Linux version 2.6.280 (u1234@infra-bld1) (gcc version 3.4.6 20060404 (Red Hat 3.4.6-3)) #1 Tue Jan 6 23:26:29 PST 2009
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 32512
Kernel command line: mem=128M ubda=../bulk_fedora/root_fs root=98:0
PID hash table entries: 512 (order: 9, 2048 bytes)
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
Memory: 126660k available
Calibrating delay loop... 4377.80 BogoMIPS (lpj=21889024)
Mount-cache hash table entries: 512
Checking for host processor cmov support...Yes
Checking that host ptys support output SIGIO...Yes
Checking that host ptys support SIGIO on close...No, enabling workaround
net_namespace: 288 bytes
/usr/include/linux/aio_abi.h not present during build
2.6 host AIO support not used - falling back to I/O thread
NET: Registered protocol family 16
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 4096 (order: 3, 32768 bytes)
TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
TCP: Hash tables configured (established 4096 bind 4096)
TCP reno registered
NET: Registered protocol family 1
Checking host MADV_REMOVE support...<3>MADV_REMOVE failed, err = -22
Can't release memory to the host - memory hotplug won't be supported
mconsole (version 2) initialized on /users/u1234/.uml/9rN2i3/mconsole
Host TLS support detected
Detected host type: i386 (GDT indexes 6 to 9)
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
msgmni has been set to 247
io scheduler noop registered
io scheduler anticipatory registered (default)
io scheduler deadline registered
io scheduler cfq registered
TCP cubic registered
NET: Registered protocol family 17
Initialized stdio console driver
Console initialized on /dev/tty0
console [tty0] enabled
Initializing software serial port version 1
console [mc-1] enabled
F_SETLK failed, file already locked by pid 0
Failed to lock '../bulk_fedora/root_fs', err = 11
Failed to open '../bulk_fedora/root_fs', errno = 11
ubda: Can't open "../bulk_fedora/root_fs": errno = 11
F_SETLK failed, file already locked by pid 0
Failed to lock '../bulk_fedora/root_fs', err = 11
Failed to open '../bulk_fedora/root_fs', errno = 11
ubda: Can't open "../bulk_fedora/root_fs": errno = 11
VFS: Cannot open root device "98:0" or unknown-block(98,0)
Please append a correct "root=" boot option; here are the available partitions:
6200         4195328 ubda driver: uml-blkdev
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(98,0)

EIP: 0073:[<002f97a2>] CPU: 0 Not tainted ESP: 007b:bffff660 EFLAGS: 00200246
    Not tainted
EAX: 00000000 EBX: 000028ec ECX: 00000013 EDX: 000028ec
ESI: 000028e9 EDI: bffff8da EBP: bffff678 DS: 007b ES: 007b
0f85be64:  [<0806aebc>] show_regs+0xb4/0xb6
0f85be90:  [<08059b02>] panic_exit+0x25/0x3b
0f85bea0:  [<08086f89>] notifier_call_chain+0x2c/0x62
0f85bec0:  [<0808703b>] __atomic_notifier_call_chain+0x17/0x1c
0f85bedc:  [<08087055>] atomic_notifier_call_chain+0x15/0x17
0f85bef8:  [<08071c52>] panic+0x4b/0xcd
0f85bf10:  [<0804991d>] mount_block_root+0x107/0x11b
0f85bf64:  [<08049982>] mount_root+0x51/0x56
0f85bf78:  [<08049aac>] prepare_namespace+0x125/0x149
0f85bf80:  [<08049629>] kernel_init+0x83/0x8c
0f85bf98:  [<08064d72>] run_kernel_thread+0x38/0x42
0f85bfcc:  [<08057600>] new_thread_handler+0x8c/0xb9
0f85bffc:  [<00000000>] 0x0

Segmentation fault
u1234-lnx linux-2.6.28$

________________________________
From: David Moffatt <Dav...@ac...>
To: K D <kd...@ya...>; use...@li...
Sent: Monday, January 12, 2009 3:47:30 PM
Subject: RE: [uml-user] F_SETLK failed, file already locked by pid 0

I don’t know if this is the cause
but look for a zombie process.  I had something were A locked a file then
forked B.  A was “kill -9”’d but not B.  Somehow
the lock was still held.  The fix was “killall A; killall B”.   
I think what happed was A was a zombie waiting for B to die so it could get its
return code.  Either that or the file lock was inherited across the lock. 
Yeah I know sounds wrong but it worked.

--David

________________________________

From:K D
[mailto:kd...@ya...] 
Sent: Monday, January 12, 2009
3:31 PM
To: use...@li...
Subject: [uml-user] F_SETLK
failed, file already locked by pid 0

If I kill all tasks in that session I should see that file getting
unlocked right? Can we write a small kernel module that finds/unlocks this
file? Will that work? Is there any other way to get around this other than
rebooting the box or making a copy of root_fs and using that for uml session? 

I've built uml with 2.6.28 sources and running this on 2.6.11 kernel.

F_SETLK failed, file already locked by pid 0
Failed to lock '../bulk_fedora/root_fs', err = 11
Failed to open '../bulk_fedora/root_fs', errno = 11
ubda: Can't open "../bulk_fedora/root_fs": errno = 11
F_SETLK failed, file already locked by pid 0
Failed to lock '../bulk_fedora/root_fs', err = 11
Failed to open '../bulk_fedora/root_fs', errno = 11
ubda: Can't open "../bulk_fedora/root_fs": errno = 11
VFS: Cannot open root device "98:0" or unknown-block(98,0)

thanks

________________________________

From:Flavio
<fbc...@gm...>
To: K D <kd...@ya...>
Cc: use...@li...
Sent: Friday, January 2, 2009
2:34:00 AM
Subject: Re: [uml-user] link
broken: http://uml.nagafix.co.uk/FedoraCore5/FedoraCore5-x86-root_fs.bz2

2008/12/26 K D <kd...@ya...>
>
> hi
>
> http://uml.nagafix.co.uk/FedoraCore5/FedoraCore5-x86-root_fs.bz2 is broken. can someone pl post a working link to fedora5 or later rootfs?
>
> thanks

Hi,

http://uml.nagafix.co.uk/ redirects to the Overseas Procedures &
Surgery Ltd. website.
Maybe it has been hacked by someone.
That is the reason why you can't download the Fedora filesystem image.

Flavio