Sorry to be so slow/indecisive, but is this not the old problem with
the memory fence pointer, which used to be fixable with the creation
of a file in /etc/sysctl.d/, say
/etc/sysctl.d/90-low-memory-access.conf
which contains the command
vm.mmap_min_addr=0.
One also needed to
keep the kernel from randomizing virtual address space with
echo 0 > /proc/sys/kernel/randomize_va_space
but I think that went away with 1.4 (??). I am not sure about any of
this with modern kernels because I run dosemu (1.4) on a 32-bit
ubuntu 9.04 virtual machine under 64-bit Fedora 19 for various complicated
reasons.
Hope this may help, and sorry if it is irrelevant.
--jim gunn
On Mon, 21 Apr 2014, jankomEarthlink wrote:
Thank you, Franta, for getting back to this problem. In the meantime I ran
strace and googled the issue and saw some bug reports on this segmentation
fault. Here is the last part of the strace listing. (Btw., I'll try your rpm
tomorrow, it is getting late here, and I have to clean up my system again
before I install your rpm, and will let you know if it worked).
[apu@Andraslinux ~]$ strace dosemu
...
write(3, "PKT: Cannot open raw sockets: Pe"..., 48) = 48
statfs("/dev/shm/", {f_type=0x1021994, f_bsize=4096, f_blocks=129447,
f_bfree=129447, f_bavail=129447, f_files=129447, f_ffree=129446, f_fsid={0,
0}, f_namelen=255, f_frsize=4096}) = 0
futex(0xd79258, FUTEX_WAKE, 2147483647) = 0
open("/dev/shm/dosemu_3778", O_RDWR|O_CREAT|O_TRUNC|O_NOFOLLOW, 0600) = 4
fcntl64(4, F_GETFD) = 0
fcntl64(4, F_SETFD, FD_CLOEXEC) = 0
unlink("/dev/shm/dosemu_3778") = 0
ftruncate64(4, 0) = 0
ftruncate64(4, 17891328) = 0
mmap2(NULL, 17891328, PROT_READ|PROT_WRITE, MAP_SHARED, 4, 0) = 0xb6bbb000
mprotect(0xb6bbb000, 17891328, PROT_READ|PROT_WRITE|PROT_EXEC) = 0
mprotect(0xb6bbb000, 17891328, PROT_READ|PROT_WRITE) = 0
mprotect(0xb6bbb000, 1114112, PROT_READ|PROT_WRITE) = 0
mmap2(NULL, 1114112, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED|MAP_FIXED, 4,
0) = 0
mprotect(0, 655360, PROT_NONE) = 0
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++
There is also an error just before the raw socket message about not finding
libc.mo file for messages in locale, but I don't think it is important.
Interestingly, there is such a file in my /user/share/locale/ directories in
many languages, including en_GB, but not in plain en.
I think the problem is with the mmap, mprotect stuff.
I hope this helps the developers.
Janos
On 04/21/2014 04:19 PM, Frantisek Hanzlik wrote:
Hi Janos, this reminded me of something similar that I have met cca three
years ago. You can try to find my thread "same distro, svn1999 DOSEMU
crashes on some PCs on SEGV, on others run fine" from 12/13/2010 in
dosemu-users list - this was on Fedora 14, but this may be same problem
which you see now on Fedora 3. But something better - I managed to compile
almost last dosemu devel version on Fedora 3 i686, and this work well at me
machine, both in console and under X (also both in terminal mode 'dosemu
-t' and with native X (xdosemu). Because there was lots things corrected
and improved, maybe it will run on Your system too. There is only one
particularity: after installing RPM and first dosemu run must be copied
kernel.sys to C:\ drive: cp /usr/share/dosemu/drive_z/kernel.sys
~/.dosemu/drives/c/ You can download RPM and SRPM package at:
http://www.hanzlici.cz/packages/fedora/dosemu/fc3/dosemu-1.4.0.8-git621.g431face.3.dbgemu.fc3.i686.rpm
http://www.hanzlici.cz/packages/fedora/dosemu/fc3/dosemu-1.4.0.8-git621.g431face.3.dbgemu.fc3.src.rpm
Good luck, Franta Hanzlik
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