Re: [uml-user] Received a panic when UML is started.

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Hey,

Is it possible to debug the modules from the pre-built UML? Because,
while I was searching I came accross an UML binary for Fedora Core. As
I am using Ubuntu will this FC UML work on my machines? And Will I be
able to debug the modules which I am wrting?

Please reply.

Thanks and Regards,
Prasad.

On 3/16/07, Prasad Joshi <pra...@gm...> wrote:
> Hi,
>
> Thanks for your reply. But, I need UML for debugging the modules which
> I am writing.
>
> Thanks and Regards,
> Prasad.
>
> On 3/16/07, Ramanujam Parthasarathi-A19423 <pa...@mo...> wrote:
> > Hi Prasad,
> >
> > If you are working on UML for the first time, it may be a good idea to
> > start with pre-built UML-binary & root-fs. You can then start
> > changing/working on different aspects based on ur needs...
> >
> > HTH,
> > ~Partha
> >
> > -----Original Message-----
> > From: use...@li...
> > [mailto:use...@li...] On Behalf Of
> > Prasad Joshi
> > Sent: Friday, March 16, 2007 9:24 PM
> > To: use...@li...
> > Subject: [uml-user] Received a panic when UML is started.
> >
> > Hi All,
> >
> > I am new to UML and doing it for the first time. When I start the UML
> > ./linux it is panicing. I am not getting what I did wrong.
> >
> > So I am attaching all the steps I did please inform me if any thing is
> > missing or if I have done something wrong.
> >
> > Please help.
> >
> > Thanks and Regards,
> > Prasad.
> >
> > I am using 2.6.20 kernel on i386 machine and OS installed is Ubuntu.
> >
> > Steps I did.
> > ************
> > make menuconfig ARCH=um
> > make ARCH=um
> > a large linux executable was created.
> >
> > Creating and mounting root file system
> > ---------------------------------------
> > dd if=/dev/zero of=my-root_fs count=1 bs=1k seek=$[2*1024*1024]
> > mkreiserfs -f my-root_fs
> >
> > mount -o loop my-root_fs /mnt
> >
> > Installing modules in the root file system
> > -------------------------------------------
> > make modules_install
> > INSTALL_MOD_PATH=/home/prasad/uml/linux-2.6.20/mnt/ ARCH=um
> >
> > Unmount the root file system
> > ---------------------------
> > umount mnt/
> >
> > Ran UML --> which panicked
> > -------
> > ./linux  ubda=my-root_fs
> >
> > Is anything missing?
> >
> > root@prasad-desktop:/home/prasad/uml/linux-2.6.20# ./linux
> > ubda=my-root_fs
> > Checking that ptrace can change system call numbers...OK
> > Checking syscall emulation patch for ptrace...OK
> > Checking advanced syscall emulation patch for ptrace...OK
> > 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
> > - PTRACE_FAULTINFO...not found
> > - PTRACE_LDT...not found
> > UML running in SKAS0 mode
> > Checking that ptrace can change system call numbers...OK
> > Checking syscall emulation patch for ptrace...OK
> > Checking advanced syscall emulation patch for ptrace...OK
> > Using a channel type which is configured out of UML
> > Using a channel type which is configured out of UML
> > Using a channel type which is configured out of UML
> > Using a channel type which is configured out of UML
> > Using a channel type which is configured out of UML
> > Using a channel type which is configured out of UML
> > Using a channel type which is configured out of UML
> > Using a channel type which is configured out of UML
> > Using a channel type which is configured out of UML
> > Using a channel type which is configured out of UML
> > Using a channel type which is configured out of UML
> > Using a channel type which is configured out of UML
> > Using a channel type which is configured out of UML
> > Using a channel type which is configured out of UML
> > Using a channel type which is configured out of UML
> > [42949372.960000] Linux version 2.6.20 (prasad@prasad-desktop) (gcc
> > version 4.1.2 20060928 (prerelease) (Ubuntu 4.1.1-13ubuntu5)) #1 Thu
> > Mar 15 21:18:38 IST 2007
> > [42949372.960000] Built 1 zonelists. Total pages: 8128
> > [42949372.960000] Kernel command line: ubda=my-root_fs root=98:0
> > [42949372.960000] PID hash table entries: 128 (order: 7, 512 bytes)
> > [42949372.960000] ------------------------
> > [42949372.960000] | Locking API testsuite:
> > [42949372.960000]
> > ------------------------------------------------------------------------
> > ----
> > [42949372.960000] | spin |wlock
> > |rlock |mutex | wsem | rsem |
> > [42949372.960000]
> > ------------------------------------------------------------------------
> > --
> > [42949372.960000] A-A deadlock:failed|failed| ok
> > |failed|failed|failed|
> > [42949372.960000] A-B-B-A deadlock:failed|failed| ok
> > |failed|failed|failed|
> > [42949372.960000] A-B-B-C-C-A deadlock:failed|failed| ok
> > |failed|failed|failed|
> > [42949372.960000] A-B-C-A-B-C deadlock:failed|failed| ok
> > |failed|failed|failed|
> > [42949372.960000] A-B-B-C-C-D-D-A deadlock:failed|failed| ok
> > |failed|failed|failed|
> > [42949372.960000] A-B-C-D-B-D-D-A deadlock:failed|failed| ok
> > |failed|failed|failed|
> > [42949372.960000] A-B-C-D-B-C-D-A deadlock:failed|failed| ok
> > |failed|failed|failed|
> > [42949372.960000] double unlock: ok | ok
> > |failed| ok |failed|failed|
> > [42949372.960000] initialize
> > held:failed|failed|failed|failed|failed|failed|
> > [42949372.960000] bad unlock order: ok | ok | ok
> > | ok | ok | ok |
> > [42949372.960000]
> > ------------------------------------------------------------------------
> > --
> > [42949372.960000] recursive read-lock: | ok
> > | |failed|
> > [42949372.960000] recursive read-lock #2: | ok
> > | |failed|
> > [42949372.960000] mixed read-write-lock:
> > |failed| |failed|
> > [42949372.960000] mixed write-read-lock:
> > |failed| |failed|
> > [42949372.960000]
> > ------------------------------------------------------------------------
> > --
> > [42949372.960000] hard-irqs-on + irq-safe-A/12:failed|failed| ok |
> > [42949372.960000] soft-irqs-on + irq-safe-A/12:failed|failed| ok |
> > [42949372.960000] hard-irqs-on + irq-safe-A/21:failed|failed| ok |
> > [42949372.960000] soft-irqs-on + irq-safe-A/21:failed|failed| ok |
> > [42949372.960000] sirq-safe-A => hirqs-on/12:failed|failed| ok |
> > [42949372.960000] sirq-safe-A => hirqs-on/21:failed|failed| ok |
> > [42949372.960000] hard-safe-A + irqs-on/12:failed|failed| ok |
> > [42949372.960000] soft-safe-A + irqs-on/12:failed|failed| ok |
> > [42949372.960000] hard-safe-A + irqs-on/21:failed|failed| ok |
> > [42949372.960000] soft-safe-A + irqs-on/21:failed|failed| ok |
> > [42949372.960000] hard-safe-A + unsafe-B #1/123:failed|failed| ok |
> > [42949372.960000] soft-safe-A + unsafe-B #1/123:failed|failed| ok |
> > [42949372.960000] hard-safe-A + unsafe-B #1/132:failed|failed| ok |
> > [42949372.960000] soft-safe-A + unsafe-B #1/132:failed|failed| ok |
> > [42949372.960000] hard-safe-A + unsafe-B #1/213:failed|failed| ok |
> > [42949372.960000] soft-safe-A + unsafe-B #1/213:failed|failed| ok |
> > [42949372.960000] hard-safe-A + unsafe-B #1/231:failed|failed| ok |
> > [42949372.960000] soft-safe-A + unsafe-B #1/231:failed|failed| ok |
> > [42949372.960000] hard-safe-A + unsafe-B #1/312:failed|failed| ok |
> > [42949372.960000] soft-safe-A + unsafe-B #1/312:failed|failed| ok |
> > [42949372.960000] hard-safe-A + unsafe-B #1/321:failed|failed| ok |
> > [42949372.960000] soft-safe-A + unsafe-B #1/321:failed|failed| ok |
> > [42949372.960000] hard-safe-A + unsafe-B #2/123:failed|failed| ok |
> > [42949372.960000] soft-safe-A + unsafe-B #2/123:failed|failed| ok |
> > [42949372.960000] hard-safe-A + unsafe-B #2/132:failed|failed| ok |
> > [42949372.960000] soft-safe-A + unsafe-B #2/132:failed|failed| ok |
> > [42949372.960000] hard-safe-A + unsafe-B #2/213:failed|failed| ok |
> > [42949372.960000] soft-safe-A + unsafe-B #2/213:failed|failed| ok |
> > [42949372.960000] hard-safe-A + unsafe-B #2/231:failed|failed| ok |
> > [42949372.960000] soft-safe-A + unsafe-B #2/231:failed|failed| ok |
> > [42949372.960000] hard-safe-A + unsafe-B #2/312:failed|failed| ok |
> > [42949372.960000] soft-safe-A + unsafe-B #2/312:failed|failed| ok |
> > [42949372.960000] hard-safe-A + unsafe-B #2/321:failed|failed| ok |
> > [42949372.960000] soft-safe-A + unsafe-B #2/321:failed|failed| ok |
> > [42949372.960000] hard-irq lock-inversion/123:failed|failed| ok |
> > [42949372.960000] soft-irq lock-inversion/123:failed|failed| ok |
> > [42949372.960000] hard-irq lock-inversion/132:failed|failed| ok |
> > [42949372.960000] soft-irq lock-inversion/132:failed|failed| ok |
> > [42949372.960000] hard-irq lock-inversion/213:failed|failed| ok |
> > [42949372.960000] soft-irq lock-inversion/213:failed|failed| ok |
> > [42949372.960000] hard-irq lock-inversion/231:failed|failed| ok |
> > [42949372.960000] soft-irq lock-inversion/231:failed|failed| ok |
> > [42949372.960000] hard-irq lock-inversion/312:failed|failed| ok |
> > [42949372.960000] soft-irq lock-inversion/312:failed|failed| ok |
> > [42949372.960000] hard-irq lock-inversion/321:failed|failed| ok |
> > [42949372.960000] soft-irq lock-inversion/321:failed|failed| ok |
> > [42949372.960000] hard-irq read-recursion/123: ok |
> > [42949372.960000] soft-irq read-recursion/123: ok |
> > [42949372.960000] hard-irq read-recursion/132: ok |
> > [42949372.960000] soft-irq read-recursion/132: ok |
> > [42949372.960000] hard-irq read-recursion/213: ok |
> > [42949372.960000] soft-irq read-recursion/213: ok |
> > [42949372.960000] hard-irq read-recursion/231: ok |
> > [42949372.960000] soft-irq read-recursion/231: ok |
> > [42949372.960000] hard-irq read-recursion/312: ok |
> > [42949372.960000] soft-irq read-recursion/312: ok |
> > [42949372.960000] hard-irq read-recursion/321: ok |
> > [42949372.960000] soft-irq read-recursion/321: ok |
> > [42949372.960000]
> > --------------------------------------------------------
> > [42949372.960000] 142 out of 218 testcases failed, as expected. |
> > [42949372.960000] ----------------------------------------------------
> > [42949372.960000] Dentry cache hash table entries: 4096 (order: 2,
> > 16384 bytes)
> > [42949372.960000] Inode-cache hash table entries: 2048 (order: 1, 8192
> > bytes)
> > [42949372.960000] Memory: 16224k available
> > [42949373.250000] Mount-cache hash table entries: 512
> > [42949373.250000] Checking for host processor cmov support...Yes
> > [42949373.250000] Checking for host processor xmm support...No
> > [42949373.250000] Checking that host ptys support output SIGIO...Yes
> > [42949373.250000] Checking that host ptys support SIGIO on close...No,
> > enabling workaround
> > [42949373.250000] Using 2.6 host AIO
> > [42949373.250000] NET: Registered protocol family 16
> > [42949373.280000] NET: Registered protocol family 2
> > [42949373.410000] IP route cache hash table entries: 1024 (order: 0,
> > 4096 bytes)
> > [42949373.410000] TCP established hash table entries: 1024 (order: 2,
> > 16384 bytes)
> > [42949373.410000] TCP bind hash table entries: 512 (order: 1, 10240
> > bytes)
> > [42949373.410000] TCP: Hash tables configured (established 1024 bind
> > 512)
> > [42949373.410000] TCP reno registered
> > [42949373.450000] Checking host MADV_REMOVE support...MADV_REMOVE
> > failed, err = -22
> > [42949373.450000] Can't release memory to the host - memory hotplug
> > won't be supported
> > [42949373.450000] mconsole (version 2) initialized on
> > /root/.uml/Mw2JMK/mconsole
> > [42949373.450000] Host TLS support detected
> > [42949373.450000] Detected host type: i386
> > [42949373.450000] Initializing RT-Tester: OK
> > [42949373.450000] io scheduler noop registered
> > [42949373.450000] io scheduler anticipatory registered (default)
> > [42949373.450000] io scheduler deadline registered
> > [42949373.460000] io scheduler cfq registered
> > [42949373.810000] RAMDISK driver initialized: 16 RAM disks of 4096K
> > size 1024 blocksize
> > [42949373.820000] loop: loaded (max 8 devices)
> > [42949373.820000] netconsole: not configured, aborting
> > [42949373.820000] TCP cubic registered
> > [42949373.820000] NET: Registered protocol family 1
> > [42949373.820000] NET: Registered protocol family 17
> > [42949373.830000] Initialized stdio console driver
> > [42949373.830000] parse_chan_pair failed for device 1
> > [42949373.830000] parse_chan_pair failed for device 2
> > [42949373.830000] parse_chan_pair failed for device 3
> > [42949373.830000] parse_chan_pair failed for device 4
> > [42949373.830000] parse_chan_pair failed for device 5
> > [42949373.830000] parse_chan_pair failed for device 6
> > [42949373.830000] parse_chan_pair failed for device 7
> > [42949373.830000] parse_chan_pair failed for device 8
> > [42949373.830000] parse_chan_pair failed for device 9
> > [42949373.830000] parse_chan_pair failed for device 10
> > [42949373.830000] parse_chan_pair failed for device 11
> > [42949373.830000] parse_chan_pair failed for device 12
> > [42949373.830000] parse_chan_pair failed for device 13
> > [42949373.830000] parse_chan_pair failed for device 14
> > [42949373.830000] parse_chan_pair failed for device 15
> > [42949373.830000] Console initialized on /dev/tty0
> > [42949373.860000] VFS: Cannot open root device "98:0" or
> > unknown-block(98,0)
> > [42949373.860000] Please append a correct "root=" boot option
> > [42949373.860000] Kernel panic - not syncing: VFS: Unable to mount
> > root fs on unknown-block(98,0)
> > [42949373.860000]
> > [42949373.860000] EIP: 0073:[<ffffe410>] CPU: 0 Not tainted ESP:
> > 007b:b79abfa8 EFLAGS: 00200246
> > [42949373.860000] Not tainted
> > [42949373.860000] EAX: 00000000 EBX: 00004525 ECX: 00000013 EDX:
> > 00004525
> > [42949373.860000] ESI: 00004521 EDI: 00000011 EBP: b79abfc4 DS: 007b
> > ES: 007b
> > [42949373.860000] 0949fe88: [<080929d3>] show_regs+0x153/0x166
> > [42949373.860000] 0949feb4: [<0807754b>] panic_exit+0x62/0xa6
> > [42949373.860000] 0949fec8: [<080c3163>] notifier_call_chain+0x3e/0x76
> > [42949373.860000] 0949fee8: [<080c32b0>]
> > atomic_notifier_call_chain+0x28/0x38
> > [42949373.860000] 0949fefc: [<080a103d>] panic+0xd5/0x215
> > [42949373.860000] 0949ff1c: [<0804aa61>] mount_block_root+0x222/0x254
> > [42949373.860000] 0949ff70: [<0804aced>] mount_root+0xb3/0xc9
> > [42949373.860000] 0949ff94: [<0804afa3>] prepare_namespace+0x2a0/0x312
> > [42949373.860000] 0949ffa4: [<0806c6e9>] init+0x1d8/0x3b5
> > [42949373.860000] 0949ffb4: [<08086e80>] run_kernel_thread+0x90/0xa6
> > [42949373.860000] 0949ffe0: [<08078273>] new_thread_handler+0x132/0x1ad
> > [42949373.860000] 0949fffc: [<a55a5a5a>] 0xa55a5a5a
> > [42949373.860000]
> > [42949373.860000] <3>Trying to free already-free IRQ 2
> > [42949373.860000] Trying to free already-free IRQ 3
> >
> > ------------------------------------------------------------------------
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