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Subject[BUG: UML 2.6.11-rc4-bk-latest] sleeping function called from invalid context and segmentation fault
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Date
Hi,

I get a few Debug messages of the form from UML:

Debug: sleeping function called from invalid context at
include/asm/arch/semaphore.h:107
in_atomic():0, irqs_disabled():1
Call Trace:
087d77b0: [<0809aaa5>] __might_sleep+0x135/0x180
087d77d8: [<084d377f>] mcount+0xf/0x20
087d77e0: [<0807cc13>] uml_console_write+0x33/0x80
087d7800: [<080a2138>] __call_console_drivers+0x88/0xc0
087d7830: [<080a2b9c>] release_console_sem+0x33c/0x5f0
087d7850: [<080a3a69>] vprintk+0x309/0x5f0
087d7868: [<084d377f>] mcount+0xf/0x20
087d78a0: [<080a23f6>] printk+0x26/0x40
087d78b0: [<081678a2>] d_splice_alias+0x2f2/0x3e0
087d78c0: [<0807f272>] line_ioctl+0x102/0x120
087d78dc: [<0807f170>] line_ioctl+0x0/0x120
087d78e0: [<0807f17a>] line_ioctl+0xa/0x120
087d78f0: [<0832b83d>] tty_ioctl+0x2bd/0x2a00
087d7930: [<08073539>] get_signals+0x49/0xb0
087d7940: [<08155fb1>] link_path_walk+0x1931/0x2580
087d7948: [<081e3d00>] ext3_permission+0x0/0x30
087d7970: [<0809115b>] os_window_size+0x2b/0x80
087d7990: [<0807e5f2>] generic_window_size+0x32/0xb0
087d79c0: [<0807d3cb>] chan_window_size+0x8b/0xa0
087d79e0: [<080801b3>] line_open+0x93/0x240
087d7a10: [<0807cb7c>] con_open+0x2c/0x40
087d7a30: [<083293b2>] tty_open+0x332/0x750
087d7a58: [<084d377f>] mcount+0xf/0x20
087d7a68: [<08144e48>] exact_match+0x8/0x20
087d7a90: [<08073218>] enable_mask+0x78/0xb0
087d7aa0: [<0807331e>] set_signals+0xce/0x2a0
087d7ad0: [<0815b49e>] do_ioctl+0x6e/0xe0
087d7b00: [<0815b608>] vfs_ioctl+0xf8/0x960
087d7b40: [<084d377f>] mcount+0xf/0x20
087d7b60: [<0815becf>] sys_ioctl+0x5f/0xb0
087d7b74: [<084d377f>] mcount+0xf/0x20
087d7b90: [<0807b162>] execute_syscall_skas+0xc2/0xe0
087d7bb0: [<0807b0ae>] execute_syscall_skas+0xe/0xe0
087d7be0: [<0806fa1c>] syscall_trace+0xc/0x200
087d7c00: [<084d377f>] mcount+0xf/0x20
087d7c20: [<0807b1fb>] handle_syscall+0x5b/0xb0
087d7c30: [<08093c52>] save_registers+0x42/0xb0
087d7c50: [<0807a19d>] userspace+0x45d/0x6e0
087d7c78: [<0807e000>] chan_interrupt+0x250/0x420
087d7cb0: [<0809c8c1>] schedule_tail+0x21/0x100
087d7cc4: [<08068250>] init+0x0/0x410
087d7cd0: [<0807aed7>] new_thread_handler+0x117/0x190
087d7d20: [<084c2358>] __restore+0x0/0x8
087d7d60: [<084c2511>] kill+0x11/0x20

Most are coming via uml_console_write. If interested you can get the
full UML console log (starting uml, logging in as root and shutting it
down again) here:

http://www-uxsup.csx.cam.ac.uk/~aia21/linux/uml/uml-console-log.txt

Also, once the UML has shutdown, the gnome-terminals (which I use
instead of xterm) do not disappear and I get the following segmentation
fault on the host:

vmlinux umid=uml0 mem=256m ubd0=ubd0 ubd1=/usr/src/ntfs_hdd10
eth0=tuntap,uml0,fe:fd:dd:f8:a6:4e ssl=none con=xterm
xterm=gnome-terminal,-t,-x root=/dev/ubda1
Set 'uml0' persistent and owned by uid 29847
Starting uml...
Checking for /proc/mm...found
Checking for the skas3 patch in the host...found
Checking PROT_EXEC mmap in /tmp...OK

/home/aia21/bin/my-start-uml: line 76: 9613 Segmentation
fault /bin/bash -c "./$KERNEL $UML_ARGS $*"
Set 'uml0' nonpersistent

Best regards,

Anton
--
Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @)
Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK
Linux NTFS maintainer / IRC: #ntfs on irc.freenode.net
WWW: http://linux-ntfs.sf.net/ & http://www-stu.christs.cam.ac.uk/~aia21/

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