Hi Peter
I run vmlinux in the background using
vmlinux ..... 0<&- >log_file 2>&1
and it works fine for me.
David
2010/11/20 Péter Szabó <pts...@gmail.com>
> Hi,
>
> I'm running
>
> linux con0=fd:0,fd:1 </dev/null
>
> and I get 100% CPU usage before UML can mount the root file system. If I
> remove `</dev/null', it works like a charm. It seems that UML doesn't work
> if stdin is not a tty. Redirecting stdout always works.
>
> 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...Checking that ptrace
> can change system call numbers...OK
> Checking syscall emulation patch for ptrace...Checking syscall emulation
> patch for ptrace...OK
> Checking advanced syscall emulation patch for ptrace...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
> - /proc/mm...not found - PTRACE_FAULTINFO... - PTRACE_LDT...not found
> - PTRACE_LDT...UML running in SKAS0 mode
> Adding 28913664 bytes to physical memory to account for exec-shield gap
> [ 0.000000] Linux version 2.6.36 (r...@narancs) (gcc version 4.1.2) #42
> Sat Nov 20 23:23:55 CET 2010
> [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on.
> Total pages: 12083
> [ 0.000000] Kernel command line: con=null ssl=null con0=fd:0,fd:1
> mem=20M ubdb=hello.in root=98:0
> [ 0.000000] PID hash table entries: 256 (order: -2, 1024 bytes)
> [ 0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768
> bytes)
> [ 0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
> [ 0.000000] Memory: 18528k available
> [ 0.000000] Hierarchical RCU implementation.
> [ 0.000000] RCU-based detection of stalled CPUs is disabled.
> [ 0.000000] Verbose stalled-CPUs detection is disabled.
> [ 0.000000] NR_IRQS:15
> [ 0.000000] Calibrating delay loop... 3512.72 BogoMIPS (lpj=17563648)
> [ 0.280000] pid_max: default: 32768 minimum: 301
> [ 0.280000] Mount-cache hash table entries: 512
> [ 0.280000] Checking for host processor cmov support...Yes
> [ 0.280000] Checking that host ptys support output SIGIO...Yes
> [ 0.280000] Checking that host ptys support SIGIO on close...No,
> enabling workaround
> [ 0.280000] Using 2.6 host AIO
> [ 0.280000] bio: create slab <bio-0> at 0
> [ 0.280000] Switching to clocksource itimer
> [ 0.280000] Host TLS support detected
> [ 0.280000] Detected host type: i386 (GDT indexes 6 to 9)
> [ 0.280000] io scheduler noop registered
> [ 0.280000] io scheduler cfq registered (default)
> [ 0.280000] Initialized stdio console driver
> [ 0.280000] Console initialized on /dev/tty0
> [ 0.280000] console [tty0] enabled
> [ 0.280000] Initializing software serial port version 1
> [ 0.280000] ubda: unknown partition table
> [ 0.280000] ubdb: unknown partition table
>
> At this point it hangs unless stdin is s tty. Without </dev/null, it
> continues and mounts the root filesystem.
>
> I've tried to add some random printk()s to arch/um/drivers/chan_kern.c, and
> it seems that enable_chan is called only once, but it returns many times.
> Maybe there is a buffer overflow and a stack corruption somewhere?
>
> Thanks,
>
> Péter
>
>
>
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