[Buildroot] Login exited
Denys Vlasenko
vda.linux at googlemail.com
Thu Sep 4 20:02:03 UTC 2008
On Thursday 04 September 2008 17:49, Steven Woody wrote:
> On Thu, Sep 4, 2008 at 10:29 PM, Hamish Moffatt <hamish at cloud.net.au> wrote:
> > On Thu, Sep 04, 2008 at 01:34:14PM +0800, Steven Woody wrote:
> >> On Thu, Sep 4, 2008 at 10:00 AM, Hamish Moffatt <hamish at cloud.net.au> wrote:
> >> > Did you try booting with init=/bin/sh as I suggested two days ago? Or
> >> > modify your inittab to present you with a shell without needing to
> >> > login? This will help to break down the problem dramatically.
> >>
> >> I did init=/bin/sh as you suggested and reported the result to the
> >> list. Again, the result is: there is nothing I can do after rootfs
> >> was loaded by kernel. I can type in characters can see the echo of
> >> what I typed on the screen, but no any other outputs. Does this has
> >> something to do with my read-only file system type (cramfs)?
> >
> > I didn't see your posting. Do you get a prompt? Do you get any messages
> > at all after the kernel loads, loads the RAM disk, etc? Please post the
> > whole log.
> >
> > No I don't see how the root file system being read-only would be
> > significant. cramfs is always read-only. I build cramfs here with
> > buildroot and it works just fine.
> >
> > Hamish
>
> Hi, Hamish
>
> Below are the whole boot message, and I like to say sorry to other
> peoples here for the reposting.
>
> ---------------
> Freeing init memory: 84K
> mount: mounting configfs on /config failed: No such device
> Error -3 while decompressing!
> c021ac2c(-8656788)->c3e6e000(4096)
> Dec 31 17:00:02 nlmt syslog.info syslogd started: BusyBox v1.12.0
> Dec 31 17:00:02 nlmt daemon.info init: init: starting pid 205, tty
> '/dev/null': '/sbin/klogd -n'
> Dec 31 17:00:02 nlmt user.notice kernel: klogd started: BusyBox
> v1.12.0 (2008-09-02 20:51:05 CST)
> Dec 31 17:00:02 nlmt user.notice kernel: Linux version 2.6.16.4
> (root at haohuibin) (gcc version 3.3) #638 Mon Aug 4 11:59:45 CST 2008
> Dec 31 17:00:02 nlmt user.warn kernel: CPU: ARM920Tid(wb) [41129200]
> revision 0 (ARMv4T)
> Dec 31 17:00:02 nlmt user.warn kernel: Machine: LMT
> Dec 31 17:00:02 nlmt user.debug kernel: Converting old-style param
> struct to taglist
> Dec 31 17:00:02 nlmt user.warn kernel: Memory policy: ECC disabled,
> Data cache writeback
> Dec 31 17:00:02 nlmt user.debug kernel: On node 0 totalpages: 16384
> Dec 31 17:00:02 nlmt user.debug kernel: DMA zone: 16384 pages, LIFO batch:3
> Dec 31 17:00:02 nlmt user.debug kernel: DMA32 zone: 0 pages, LIFO batch:0
> Dec 31 17:00:02 nlmt user.debug kernel: Normal zone: 0 pages, LIFO batch:0
> Dec 31 17:00:02 nlmt user.debug kernel: HighMem zone: 0 pages, LIFO batch:0
> Dec 31 17:00:02 nlmt user.warn kernel: CPU S3C2440A (id 0x32440001)
> Dec 31 17:00:02 nlmt user.warn kernel: S3C2440: core 399.651 MHz,
> memory 99.912 MHz, peripheral 49.956 MHz
> Dec 31 17:00:02 nlmt user.info kernel: S3C2410 Clocks, (c) 2004 Simtec
> Electronics
> Dec 31 17:00:02 nlmt user.warn kernel: CLOCK: Slow mode (2.116 MHz),
> fast, MPLL on, UPLL on
> Dec 31 17:00:02 nlmt user.warn kernel: CPU0: D VIVT write-back cache
> Dec 31 17:00:02 nlmt user.warn kernel: CPU0: I cache: 16384 bytes,
> associativity 64, 32 byte lines, 8 sets
> Dec 31 17:00:02 nlmt user.warn kernel: CPU0: D cache: 16384 bytes,
> associativity 64, 32 byte lines, 8 sets
> Dec 31 17:00:02 nlmt user.warn kernel: Built 1 zonelists
> Dec 31 17:00:02 nlmt user.notice kernel: Kernel command line:
> root=/dev/mtdblock3 console=ttyS0
> Dec 31 17:00:02 nlmt user.warn kernel: irq: clearing pending ext status 00000020
> Dec 31 17:00:02 nlmt user.warn kernel: irq: clearing subpending status 00000003
> Dec 31 17:00:02 nlmt user.warn kernel: irq: clearing subpending status 00000002
> Dec 31 17:00:02 nlmt user.warn kernel: PID hash table entries: 512
> (order: 9, 8192 bytes)
> Dec 31 17:00:02 nlmt user.warn kernel: timer tcon=00500000, tcnt a29d,
> tcfg 00000200,00000000, usec 00001ebf
> Dec 31 17:00:02 nlmt user.warn kernel: Console: colour dummy device 80x30
> Dec 31 17:00:02 nlmt user.warn kernel: Dentry cache hash table
> entries: 16384 (order: 4, 65536 bytes)
> Dec 31 17:00:02 nlmt user.warn kernel: Inode-cache hash table entries:
> 8192 (order: 3, 32768 bytes)
> Dec 31 17:00:02 nlmt user.info kernel: Memory: 64MB = 64MB total
> Dec 31 17:00:02 nlmt user.notice kernel: Memory: 62604KB available
> (1880K code, 230K data, 84K init)
> Dec 31 17:00:02 nlmt user.debug kernel: Calibrating delay loop...
> 199.47 BogoMIPS (lpj=498688)
> Dec 31 17:00:02 nlmt user.warn kernel: Mount-cache hash table entries: 512
> Dec 31 17:00:02 nlmt user.info kernel: CPU: Testing write buffer coherency: ok
> Dec 31 17:00:02 nlmt user.info kernel: NET: Registered protocol family 16
> Dec 31 17:00:02 nlmt user.warn kernel: S3C2440: Initialising architecture
> Dec 31 17:00:02 nlmt user.warn kernel: S3C2440: IRQ Support
> Dec 31 17:00:02 nlmt user.warn kernel: S3C2440: Clock Support, UPLL
> 47.980 MHz, DVS off
> Dec 31 17:00:02 nlmt user.notice kernel: SCSI subsystem initialized
> Dec 31 17:00:02 nlmt user.info kernel: usbcore: registered new driver usbfs
> Dec 31 17:00:02 nlmt user.info kernel: usbcore: registered new driver hub
> Dec 31 17:00:02 nlmt user.warn kernel: S3C2410 DMA Driver, (c)
> 2003-2004 Simtec Electronics
> Dec 31 17:00:02 nlmt user.warn kernel: DMA channel 0 at c4800000, irq 33
> Dec 31 17:00:02 nlmt user.warn kernel: DMA channel 1 at c4800040, irq 34
> Dec 31 17:00:02 nlmt user.warn kernel: DMA channel 2 at c4800080, irq 35
> Dec 31 17:00:02 nlmt user.warn kernel: DMA channel 3 at c48000c0, irq 36
> Dec 31 17:00:02 nlmt user.warn kernel: yaffs Aug 4 2008 11:57:59 Installing.
> Dec 31 17:00:02 nlmt user.info kernel: io scheduler noop registered (default)
> Dec 31 17:00:02 nlmt user.warn kernel: Console: switching to mono
> frame buffer device 20x20
> Dec 31 17:00:02 nlmt user.info kernel: fb0: s3c2410fb frame buffer device
> Dec 31 17:00:02 nlmt user.warn kernel: S3C2410 RTC, (c) 2004 Simtec Electronics
> Dec 31 17:00:02 nlmt user.info kernel: s3c2410-rtc s3c2410-rtc: rtc
> disabled, re-enabling
> Dec 31 17:00:02 nlmt user.info kernel: Serial: 8250/16550 driver
> $Revision: 1.90 $ 2 ports, IRQ sharing disabled
> Dec 31 17:00:02 nlmt user.info kernel: serial8250: tts0 at MMIO
> 0xe1500000 (irq = 18) is a 16550A
> Dec 31 17:00:02 nlmt user.info kernel: serial8250: tts1 at MMIO
> 0xe1500008 (irq = 19) is a 16550A
> Dec 31 17:00:02 nlmt user.info kernel: s3c2440-uaDec 31 17:00:02 nlmt
> user.info kernel: s3c2440-uDec 31 17:00:02 nlmt user.notice kernel:
> cmdlineDec 31 17:00:02 nlmt user.notice kernel: RedBootDec 31 17:00:02
> nlmt user.info kernel: Scanning Dec 31 17:00:02 nlmt user.info kernel:
> s3c2410-oDec 31 17:00:02 nlmt user.info kernel: usbcore: Dec 31
> 17:00:02 nlmt user.info kernel: NET: RegiDec 31 17:00:02 nlmt
> user.info kernel: TCP reno Dec 31 17:00:02 nlmt user.info kernel: usb
> 1-1: Dec 31 17:00:02 nlmt user.warn kernel: Error -3
>
>
> Welcome to the Erik's uClibc development environment.
> nlmt login: Vendor: Teclast Model: CoolFlash Rev: 0.00
> Type: Direct-Access ANSI SCSI revision: 02
> Dec 31 17:00:06 nlmt user.notice kernel: Vendor: Teclast Model:
> CoolFlash SCSI device sda: 1007616 512-byte hdwr sectors (516 MB)
> Rev: 0.00
> Dec 31 17:00:06 nlmt user.notsda: Write Protect is off
> sda: assuming drive cache: write through
> ice kernel: Type: Direct-Access ANSI SCSI revision: 02
> Dec 31 17:00:06 nlmt user.notice kernel: SCSI device sda: 10076SCSI
> device sda: 1007616 512-byte hdwr sectors (516 MB)
> 16 512-byte hdwr sectors (516 MB)
> Dec 31 17:00:sda: Write Protect is off
> sda: assuming drive cache: write through
> sda:06 nlmt user.notice kernel: sda: Write Protect is off
> Dec 31 17:00:06 nlmt user.debug kernel: sda: Mode Sense: 00 00 00 00
> Dec 31 17:00:06 nlmt user.err kernel: sda: assuming drive cache: write through
> Dec 31 17:00:06 nlmt user.notice kernel: SCSI device sda: 1007616
> 512-byte hdwr sectors (516 MB)
> Dec 31 17:00:06 nlmt user.notice kernel: sda: Write Protect is off
> Dec 31 17:00:06 nlmt user.debug kernel: sda: Mode Sense: 00 00 00 00
> Dec 31 17:00:06 nlmt user.err kernel: sda: assuming drive cache: write through
> Dec 31 17:00:06 nlmt user.info kernel: sda:
> sda1
> sd 0:0:0:0: Attached scsi removable disk sda
> Dec 31 17:00:06 nlmt user.info kernel: sda1
> Dec 31 17:00:06 nlmt user.notice kernel: sd 0:0:0:0: Attached scsi
> removable disk sda
> Dec 31 17:00:06 nlmt user.debug kernel: usb-storage: device scan complete
>
>
>
> Welcome to the Erik's uClibc development environment.
> nlmt login: root
> Dec 31 17:00:29 nlmt auth.info login[203]: root login on 'ttyS0'
Aha! login is started, and then it exits. It is here in login.c:
if (pw->pw_uid == 0)
syslog(LOG_INFO, "root login%s", fromhost); <========== this is "root login on 'ttyS0'"
#if ENABLE_SELINUX
/* well, a simple setexeccon() here would do the job as well,
* but let's play the game for now */
set_current_security_context(user_sid);
#endif
// util-linux login also does:
// /* start new session */
// setsid();
// /* TIOCSCTTY: steal tty from other process group */
// if (ioctl(0, TIOCSCTTY, 1)) error_msg...
// BBox login used to do this (see above):
// bb_setpgrp();
// If this stuff is really needed, add it and explain why!
/* set signals to defaults */
signal(SIGALRM, SIG_DFL);
/* Is this correct? This way user can ctrl-c out of /etc/profile,
* potentially creating security breach (tested with bash 3.0).
* But without this, bash 3.0 will not enable ctrl-c either.
* Maybe bash is buggy?
* Need to find out what standards say about /bin/login -
* should it leave SIGINT etc enabled or disabled? */
signal(SIGINT, SIG_DFL);
/* Exec login shell with no additional parameters */
bb_error_msg("run_shell(%s)", tmp);
run_shell(tmp, 1, NULL, NULL);
/* return EXIT_FAILURE; - not reached */
}
Insert debugging bb_error_msg's above and try again. Where does it stop?
--
vda
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