Confirmed on my athlon64 gentoo setup. I've been running 2.6.14.3 as host
kernel for ages (since I was too wimpy to try to upgrade a host kernel
remote on a machine that required binary proprietary drivers).
On 2.6.14.3 x86_64 all my 32bit UMLs run fine with various guest kernels
compiled in various circumstances.
On 2.6.18-gentoo-r6 x86_64 (genkernel), all guest UMLs spin up to 100% and
does nothing, no output whatsoever.
Strace says:
execve("./vmlinux", ["./vmlinux"], [/* 28 vars */]) = 0
[ Process PID=13658 runs in 32 bit mode. ]
uname({sys="Linux", node="master", ...}) = 0
brk(0) = 0xffffffffa0314000
brk(0xa0314844) = 0xffffffffa0314844
set_thread_area(0xffdb51d0) = 0
brk(0xa0335844) = 0xffffffffa0335844
brk(0xa0336000) = 0xffffffffa0336000
getrlimit(RLIMIT_STACK, {rlim_cur=-4286578688, rlim_max=4292563436}) = 0
rt_sigaction(SIGINT, {0xc0000000a001cad8, [], 0}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [INT], NULL, 8) = 0
rt_sigaction(SIGTERM, {0xc0000000a001cad8, [],
SA_INTERRUPT|SA_ONESHOT|0x161e48}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [TERM], NULL, 8) = 0
rt_sigaction(SIGHUP, {0xc0000000a001cad8, [], 0}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [HUP], NULL, 8) = 0
fstat64(0x1, 0xffdb4ad8) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0x1000) = 0xfffffffff7fe8000
mmap2(NULL, 4096, PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0x1000) = 0xfffffffff7fe7000
clone(child_stack=0xf7fe7fd4, flags=|SIGCHLD) = 13659
--- SIGCHLD (Child exited) @ 0 (0) ---
waitpid(13659, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGSTOP}], WSTOPPED) =
13659
ptrace(0x15 /* PTRACE_??? */, 13659, 0, 0x1) = -1 EINVAL (Invalid
argument)
Pity... I had finally decided to upgrade the host kernel... :-)
// Joel
On Fri, 19 Jan 2007, Antoine Martin wrote:
> Antoine Martin wrote:
>>>>> I have downgraded the x86 boxes to 2.6.15.7 and these are up and
>>>>> running again. But I can't do that for all of them, and this is just
>>>>> not an option for some of the amd64 boxes.
>>>>
>>>> My setup is:
>>> Thanks for that. That is very similar to mine.
>>> I don't think this has anything to do with the guest... So I'll try to
>>> remove the skas3 patch from the host and see how it goes.
>>>
>> I did, and no improvement... x86 guests still hang.
>> Could you post a binary guest kernel somewhere so I can try that?
>> (even if it isn't static - glibc should be similar since we're using
>> Gentoo amd64)
>> If that still does not work then I can be certain that it is something
>> to do with the host.
> I've just tried on 3 more hosts, all AMD64 Gentoo fully up to date,
> kernel 2.6.19.2. No skas, no exec shield, no selinux, plain kernel.org:
> None of them work with any of the 32-bit kernels!
> It prints nothing, just sits there spinning at 100% cpu.
> So I am now totally convinced that i haven't got a weird setup.
> Something else is broken in UML.
>
> On fully up to date Fedora Core 6 x86_64, the kernel does display
> something before crashing:
> # uname -a
> Linux localhost.localdomain 2.6.18-1.2869.fc6 #1 SMP Wed Dec 20 14:51:34
> EST 2006 x86_64 x86_64 x86_64 GNU/Linux
> # ./kernel32-2.6.19.2
> Checking that ptrace can change system call numbers...OK
> Checking syscall emulation patch for ptrace...missing
> 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
>
> [EMAIL PROTECTED] home]#
>
> This is 100% repeatable. Plain Fedora.
> Many users will have a similar setup and will just give up on UML.
> So I as I said before, UML is currently unusable for most people out
> there running fairly recent systems.
>
> Antoine
>
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