[uml-devel] Programs in guest segfault, amd64 host and guest

[Jan Dittmer <jdi@l4x.org>]

- Guest 2.6.19-rc1-git11
- Host Debian 2.6.18-1-amd64
- Debian etch for host and guest
- both using ext3
- command to start the guest
./linux-2.6.19-rc1-git11 ubd0=umlblob.cow,etch-amd64.img \
    eth0=daemon,10:00:00:00:00:02,unix,/var/run/uml-utilities/uml_switch.ctl \
         mem=128M \
         con=null umid=umlprey \
         >/dev/null 2>&1 &


$ strace btlaunchmany /tmp/
...
mmap(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|0x40, 
-1, 0) = 0x41c4e000
mprotect(0x41c4e000, 4096, PROT_NONE)   = 0
clone(Process 484 attached
child_stack=0x4244e280, 
flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID|CLONE_DETACHED, 
parent_tidptr=0x4244e9f0, tls=0x4244e960, child_tidptr=0x4244e9f0) = 484
[pid   483] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid   484] --- SIGSEGV (Segmentation fault) @ 0 (0) ---
Process 484 detached
<... rt_sigprocmask resumed> NULL, 8)   = 0
+++ killed by SIGSEGV +++
Process 483 detached

$ strace mlnet -stdout
...
gettimeofday({1161185543, 817872}, NULL) = 0
mmap(NULL, 8392704, PROT_READ|PROT_WRITE|PROT_EXEC, 
MAP_PRIVATE|MAP_ANONYMOUS|0x40, -1, 0) = 0x41ccd000
mprotect(0x41ccd000, 4096, PROT_NONE)   = 0
clone(child_stack=0x424cd270, 
flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID|CLONE_DETACHED, 
parent_tidptr=0x424cd9f0, tls=0x424cd960, child_tidptr=0x424cd9f0) = 502
gettimeofday({1161185543, 820912}, NULL) = 0
poll([{fd=7, events=POLLIN}, {fd=6, events=POLLIN}, {fd=5, events=POLLIN}, 
{fd=4, events=POLLIN}, {fd=3, events=POLLIN}], 5, 96) = -1 EINTR 
(Interrupted system call)
+++ killed by SIGSEGV +++
Process 501 detached

Additionally I'm having build failure compiling ARCH=um SUBARCH=i386.

Thanks for any pointers,

Jan


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