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Re: [uml-user] UML on SMP host w/2.6.4+ kernel
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From: Dennis M. <de...@mu...> - 2004-05-11 21:30:30
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Here is gdb output for the problem I'm getting. I'm using host 2.6.6 w/
skas. This is the 2.6.4 guest kernel. Keep in mind I'm running 2.6.4
on other machines and it works just fine. I can't think of any reason
it shouldn't on this one either but maybe someone else can.
If I run the program not in debug mode it goes into the background
immediately. If I type fg at the prompt, it seg faults:
--bash--
denlin uml # ./linux ubd0=./reiser_fs root=/dev/ubd/0
Checking for the skas3 patch in the host...found
Checking for /proc/mm...found
[1]+ Stopped ./linux ubd0=./reiser_fs root=/dev/ubd/0
denlin uml # fg
./linux ubd0=./reiser_fs root=/dev/ubd/0
Segmentation fault
--bash--
The same thing happens each time I try to debug. I get to the
process.c:180 and gdb starts looking kind of funny. The only
breakpoint I set was the one where I started the debug output below (
um_arch:386). The debugger jumps back to line 103, 108 a few times then
I get SIGSTOP.
Here is the gdb output:
--gdb--
Breakpoint 2, linux_main (argc=-2145784052, argv=0x80000000)
at arch/um/kernel/um_arch.c:386
386 task_protections((unsigned long) &init_thread_info);
(gdb) n
383 init_task.thread.kernel_stack = (unsigned long)
&init_thread_info +
(gdb)
386 task_protections((unsigned long) &init_thread_info);
(gdb)
387 os_flush_stdout();
(gdb)
389 return(CHOOSE_MODE(start_uml_tt(), start_uml_skas()));
(gdb) s
start_uml_skas () at arch/um/kernel/skas/process_kern.c:165
165 start_userspace(0);
(gdb) s
start_userspace (cpu=0) at arch/um/kernel/skas/process.c:108
108 stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE |
PROT_EXEC,
(gdb) n
103 {
(gdb)
108 stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE |
PROT_EXEC,
(gdb)
103 {
(gdb)
108 stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE |
PROT_EXEC,
(gdb)
110 if(stack == MAP_FAILED)
(gdb)
108 stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE |
PROT_EXEC,
(gdb)
110 if(stack == MAP_FAILED)
(gdb)
114 pid = clone(userspace_tramp, (void *) sp,
(gdb)
112 sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *);
(gdb)
114 pid = clone(userspace_tramp, (void *) sp,
(gdb)
Detaching after fork from child process 7137.
Program received signal SIGSTOP, Stopped (signal).
0xffffe410 in ?? ()
--gdb--
Any ideas?
-Dennis
Dennis Muhlestein wrote:
> I ran uml ok up until my host went from the 2.6.3 to 2.6.4 kernel.
> I have a pentium 4 machine that is hyperthreaded. (1.5 gigs ram)
>
> When I try to start the uml kernel, I get a seg fault:
>
> Checking for the skas3 patch in the host...found
> Checking for /proc/mm...found
> Kernel virtual memory size shrunk to 124780544 bytes
> Segmentation fault
>
> I've tried to debug the kernel to see where it is happening, but am
> having trouble forking to the correct child process. When I set the
> follow-fork-mode to child, I always end up in a different process from
> the one that is seg faulting and I don't quite know enough about the
> uml kernel to continue figuring this out.
>
> Anyway, I've attached the .config file I used to build the guest
> kernel. It is for stock 2.6.4 kernel with uml-patch 2.6.4-1
>
> I'm using the same guest kernel config on a separate machine that is
> an pentium 4 2.0 g machine (not hyperthreaded) and it works fine. So
> I think the only difference is the smp configuration in my host
> kernel. I've tried various configurations with highmem on/off and
> CONFIG_KERNEL_HALF_GIGS to 1 or 2 and it doesn't seem to make any
> difference.
>
> My host is patched with the blaisorblade patch here:
> http://www.user-mode-linux.org/~blaisorblade/patches/host-skas3-2.6.3-v1.patch
>
>
> I've seen references in the mailing lists to bug fixes with smp and
> this match but I'm not having luck with it after the 2.6.4 kernels.
> It worked pre 2.6.4 ok.
>
> Thanks
>
> -Dennis
>
>------------------------------------------------------------------------
>
>#
># Automatically generated make config: don't edit
>#
>CONFIG_USERMODE=y
>CONFIG_MMU=y
>CONFIG_UID16=y
>CONFIG_RWSEM_GENERIC_SPINLOCK=y
>
>#
># UML-specific options
>#
># CONFIG_MODE_TT is not set
># CONFIG_STATIC_LINK is not set
>CONFIG_MODE_SKAS=y
>CONFIG_NET=y
>CONFIG_BINFMT_ELF=y
>CONFIG_BINFMT_MISC=y
>CONFIG_HOSTFS=y
>CONFIG_HPPFS=y
>CONFIG_MCONSOLE=y
>CONFIG_MAGIC_SYSRQ=y
># CONFIG_HOST_2G_2G is not set
># CONFIG_UML_SMP is not set
># CONFIG_SMP is not set
>CONFIG_NEST_LEVEL=0
>CONFIG_KERNEL_HALF_GIGS=2
># CONFIG_HIGHMEM is not set
>CONFIG_PROC_MM=y
>CONFIG_KERNEL_STACK_ORDER=2
>CONFIG_UML_REAL_TIME_CLOCK=y
>
>#
># Code maturity level options
>#
>CONFIG_EXPERIMENTAL=y
>CONFIG_CLEAN_COMPILE=y
>CONFIG_STANDALONE=y
>CONFIG_BROKEN_ON_SMP=y
>
>#
># General setup
>#
>CONFIG_SWAP=y
>CONFIG_SYSVIPC=y
>CONFIG_BSD_PROCESS_ACCT=y
>CONFIG_SYSCTL=y
>CONFIG_LOG_BUF_SHIFT=14
># CONFIG_HOTPLUG is not set
>CONFIG_IKCONFIG=y
>CONFIG_IKCONFIG_PROC=y
># CONFIG_EMBEDDED is not set
>CONFIG_KALLSYMS=y
>CONFIG_FUTEX=y
>CONFIG_EPOLL=y
>CONFIG_IOSCHED_NOOP=y
>CONFIG_IOSCHED_AS=y
>CONFIG_IOSCHED_DEADLINE=y
># CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
>
>#
># Loadable module support
>#
>CONFIG_MODULES=y
>CONFIG_MODULE_UNLOAD=y
># CONFIG_MODULE_FORCE_UNLOAD is not set
>CONFIG_OBSOLETE_MODPARM=y
># CONFIG_MODVERSIONS is not set
>CONFIG_KMOD=y
>
>#
># Generic Driver Options
>#
>
>#
># Character Devices
>#
>CONFIG_STDIO_CONSOLE=y
>CONFIG_SSL=y
>CONFIG_FD_CHAN=y
>CONFIG_NULL_CHAN=y
>CONFIG_PORT_CHAN=y
>CONFIG_PTY_CHAN=y
>CONFIG_TTY_CHAN=y
>CONFIG_XTERM_CHAN=y
>CONFIG_CON_ZERO_CHAN="fd:0,fd:1"
>CONFIG_CON_CHAN="xterm"
>CONFIG_SSL_CHAN="pty"
>CONFIG_UNIX98_PTYS=y
>CONFIG_UNIX98_PTY_COUNT=256
># CONFIG_WATCHDOG is not set
>CONFIG_UML_SOUND=y
>CONFIG_SOUND=y
>CONFIG_HOSTAUDIO=y
>
>#
># Block Devices
>#
>CONFIG_BLK_DEV_UBD=y
># CONFIG_BLK_DEV_UBD_SYNC is not set
>CONFIG_BLK_DEV_COW_COMMON=y
>CONFIG_BLK_DEV_LOOP=y
>CONFIG_BLK_DEV_NBD=y
># CONFIG_BLK_DEV_RAM is not set
># CONFIG_MMAPPER is not set
>CONFIG_NETDEVICES=y
>
>#
># UML Network Devices
>#
>CONFIG_UML_NET=y
># CONFIG_UML_NET_ETHERTAP is not set
>CONFIG_UML_NET_TUNTAP=y
># CONFIG_UML_NET_SLIP is not set
># CONFIG_UML_NET_DAEMON is not set
># CONFIG_UML_NET_MCAST is not set
># CONFIG_UML_NET_PCAP is not set
># CONFIG_UML_NET_SLIRP is not set
>
>#
># Networking support
>#
>
>#
># Networking options
>#
>CONFIG_PACKET=y
>CONFIG_PACKET_MMAP=y
># CONFIG_NETLINK_DEV is not set
>CONFIG_UNIX=y
># CONFIG_NET_KEY is not set
>CONFIG_INET=y
># CONFIG_IP_MULTICAST is not set
># CONFIG_IP_ADVANCED_ROUTER is not set
># CONFIG_IP_PNP is not set
># CONFIG_NET_IPIP is not set
># CONFIG_NET_IPGRE is not set
># CONFIG_ARPD is not set
># CONFIG_INET_ECN is not set
># CONFIG_SYN_COOKIES is not set
># CONFIG_INET_AH is not set
># CONFIG_INET_ESP is not set
># CONFIG_INET_IPCOMP is not set
># CONFIG_IPV6 is not set
># CONFIG_DECNET is not set
># CONFIG_BRIDGE is not set
># CONFIG_NETFILTER is not set
>
>#
># SCTP Configuration (EXPERIMENTAL)
>#
>CONFIG_IPV6_SCTP__=y
># CONFIG_IP_SCTP is not set
># CONFIG_ATM is not set
># CONFIG_VLAN_8021Q is not set
># CONFIG_LLC2 is not set
># CONFIG_IPX is not set
># CONFIG_ATALK is not set
># CONFIG_X25 is not set
># CONFIG_LAPB is not set
># CONFIG_NET_DIVERT is not set
># CONFIG_ECONET is not set
># CONFIG_WAN_ROUTER is not set
># CONFIG_NET_FASTROUTE is not set
># CONFIG_NET_HW_FLOWCONTROL is not set
>
>#
># QoS and/or fair queueing
>#
># CONFIG_NET_SCHED is not set
>
>#
># Network testing
>#
># CONFIG_NET_PKTGEN is not set
>CONFIG_DUMMY=y
># CONFIG_BONDING is not set
># CONFIG_EQUALIZER is not set
>CONFIG_TUN=y
>
>#
># Ethernet (10 or 100Mbit)
>#
>CONFIG_NET_ETHERNET=y
>CONFIG_MII=y
>
>#
># Ethernet (1000 Mbit)
>#
>
>#
># Ethernet (10000 Mbit)
>#
># CONFIG_PPP is not set
># CONFIG_SLIP is not set
>
>#
># Wireless LAN (non-hamradio)
>#
># CONFIG_NET_RADIO is not set
>
>#
># Token Ring devices
>#
># CONFIG_SHAPER is not set
>
>#
># Wan interfaces
>#
># CONFIG_WAN is not set
>
>#
># Amateur Radio support
>#
># CONFIG_HAMRADIO is not set
>
>#
># IrDA (infrared) support
>#
># CONFIG_IRDA is not set
>
>#
># Bluetooth support
>#
># CONFIG_BT is not set
>
>#
># File systems
>#
>CONFIG_EXT2_FS=y
># CONFIG_EXT2_FS_XATTR is not set
># CONFIG_EXT3_FS is not set
># CONFIG_JBD is not set
>CONFIG_REISERFS_FS=y
># CONFIG_REISERFS_CHECK is not set
># CONFIG_REISERFS_PROC_INFO is not set
># CONFIG_JFS_FS is not set
># CONFIG_XFS_FS is not set
>CONFIG_MINIX_FS=y
># CONFIG_ROMFS_FS is not set
># CONFIG_QUOTA is not set
># CONFIG_AUTOFS_FS is not set
>CONFIG_AUTOFS4_FS=y
>
>#
># CD-ROM/DVD Filesystems
>#
># CONFIG_ISO9660_FS is not set
># CONFIG_UDF_FS is not set
>
>#
># DOS/FAT/NT Filesystems
>#
># CONFIG_FAT_FS is not set
># CONFIG_NTFS_FS is not set
>
>#
># Pseudo filesystems
>#
>CONFIG_PROC_FS=y
>CONFIG_PROC_KCORE=y
>CONFIG_DEVFS_FS=y
>CONFIG_DEVFS_MOUNT=y
># CONFIG_DEVFS_DEBUG is not set
># CONFIG_DEVPTS_FS_XATTR is not set
>CONFIG_TMPFS=y
># CONFIG_HUGETLB_PAGE is not set
>CONFIG_RAMFS=y
>
>#
># Miscellaneous filesystems
>#
># CONFIG_ADFS_FS is not set
># CONFIG_AFFS_FS is not set
># CONFIG_HFS_FS is not set
># CONFIG_HFSPLUS_FS is not set
># CONFIG_BEFS_FS is not set
># CONFIG_BFS_FS is not set
># CONFIG_EFS_FS is not set
># CONFIG_CRAMFS is not set
># CONFIG_VXFS_FS is not set
># CONFIG_HPFS_FS is not set
># CONFIG_QNX4FS_FS is not set
># CONFIG_SYSV_FS is not set
># CONFIG_UFS_FS is not set
>
>#
># Network File Systems
>#
># CONFIG_NFS_FS is not set
># CONFIG_NFSD is not set
># CONFIG_EXPORTFS is not set
>CONFIG_SMB_FS=y
># CONFIG_SMB_NLS_DEFAULT is not set
># CONFIG_CIFS is not set
># CONFIG_NCP_FS is not set
># CONFIG_CODA_FS is not set
># CONFIG_AFS_FS is not set
>
>#
># Partition Types
>#
># CONFIG_PARTITION_ADVANCED is not set
>CONFIG_MSDOS_PARTITION=y
>
>#
># Native Language Support
>#
>CONFIG_NLS=y
>CONFIG_NLS_DEFAULT="iso8859-1"
># CONFIG_NLS_CODEPAGE_437 is not set
># CONFIG_NLS_CODEPAGE_737 is not set
># CONFIG_NLS_CODEPAGE_775 is not set
># CONFIG_NLS_CODEPAGE_850 is not set
># CONFIG_NLS_CODEPAGE_852 is not set
># CONFIG_NLS_CODEPAGE_855 is not set
># CONFIG_NLS_CODEPAGE_857 is not set
># CONFIG_NLS_CODEPAGE_860 is not set
># CONFIG_NLS_CODEPAGE_861 is not set
># CONFIG_NLS_CODEPAGE_862 is not set
># CONFIG_NLS_CODEPAGE_863 is not set
># CONFIG_NLS_CODEPAGE_864 is not set
># CONFIG_NLS_CODEPAGE_865 is not set
># CONFIG_NLS_CODEPAGE_866 is not set
># CONFIG_NLS_CODEPAGE_869 is not set
># CONFIG_NLS_CODEPAGE_936 is not set
># CONFIG_NLS_CODEPAGE_950 is not set
># CONFIG_NLS_CODEPAGE_932 is not set
># CONFIG_NLS_CODEPAGE_949 is not set
># CONFIG_NLS_CODEPAGE_874 is not set
># CONFIG_NLS_ISO8859_8 is not set
># CONFIG_NLS_CODEPAGE_1250 is not set
># CONFIG_NLS_CODEPAGE_1251 is not set
># CONFIG_NLS_ISO8859_1 is not set
># CONFIG_NLS_ISO8859_2 is not set
># CONFIG_NLS_ISO8859_3 is not set
># CONFIG_NLS_ISO8859_4 is not set
># CONFIG_NLS_ISO8859_5 is not set
># CONFIG_NLS_ISO8859_6 is not set
># CONFIG_NLS_ISO8859_7 is not set
># CONFIG_NLS_ISO8859_9 is not set
># CONFIG_NLS_ISO8859_13 is not set
># CONFIG_NLS_ISO8859_14 is not set
># CONFIG_NLS_ISO8859_15 is not set
># CONFIG_NLS_KOI8_R is not set
># CONFIG_NLS_KOI8_U is not set
># CONFIG_NLS_UTF8 is not set
>
>#
># Security options
>#
># CONFIG_SECURITY is not set
>
>#
># Cryptographic options
>#
># CONFIG_CRYPTO is not set
>
>#
># Library routines
>#
># CONFIG_CRC32 is not set
>
>#
># SCSI support
>#
># CONFIG_SCSI is not set
>
>#
># Multi-device support (RAID and LVM)
>#
># CONFIG_MD is not set
>
>#
># Memory Technology Devices (MTD)
>#
># CONFIG_MTD is not set
>
>#
># Kernel hacking
>#
># CONFIG_DEBUG_SLAB is not set
># CONFIG_DEBUG_SPINLOCK is not set
>CONFIG_DEBUG_INFO=y
>CONFIG_FRAME_POINTER=y
>CONFIG_PT_PROXY=y
># CONFIG_GPROF is not set
># CONFIG_GCOV is not set
>
>
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