Date: 21 Nov 1999 20:24:15 +0100 From: Thierry.Besancon@lps.ens.fr To: "Mark W. Krentel" <krentel@dreamscape.com> Cc: besancon@lps.ens.fr Subject: Re: running linux binaries from ext2fs partition Message-ID: <wnn7ljblkbk.fsf@excalibur.lps.ens.fr> In-Reply-To: "Mark W. Krentel"'s message of Sat, 20 Nov 1999 15:17:58 -0500 (EST) References: <199911202017.PAA03794@dreamscape.com>
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Dixit "Mark W. Krentel" <krentel@dreamscape.com> (le Sat, 20 Nov 1999 15:17:58 -0500 (EST)) :
>>
>> Is it possible to run linux (or freebsd) binaries directly from a
>> local ext2fs partition?
>>
>> ...
>>
>> While we're on the subject, on what filesystem types is it ok to run
>> binaries? Local freebsd (UFS), NFS, and cdrom should all work, right?
>> Are there others?
>>
Hello
I don't know the answer to the last question but here's what I found.
I setup X terminals using FreeBSD 3.3-RELEASE.
/tmp is a MFS :
Filesystem 1K-blocks Used Avail Capacity Mounted on
129.199.120.250:/ 127023 31651 85211 27% /
mfs:29 959 668 215 76% /conf/etc
/conf/etc 959 668 215 76% /etc
129.199.120.250:/usr 190543 153042 22258 87% /usr
129.199.120.250:/usr/local 2846396 1958786 659899 75% /usr/local
mfs:61 3935 1431 2190 40% /var
/var/tmp 3935 1431 2190 40% /tmp
mfs:91 1511 47 1344 3% /dev
The X terminal runs without any swap.
/etc/rc.sysctl confirms it as well :
sysctl -w vm.swap_enabled=0
Whenever I run an executable residing in the mfs /tmp, it justs hangs
the kernel :
# cp /bin/ls /tmp
# df /tmp/.
Filesystem 1K-blocks Used Avail Capacity Mounted on
/var/tmp 3935 1432 2189 40% /tmp
# /tmp/ls
(workstation freezes)
Here's the panic :
Fatal trap 12 : page fault while in kernel mode
fault virtual address = 0x3e
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc022bf14
stack pointer = 0x10:0xc4546bc8
frame pointer = 0x10:0xc4546ca4
code segment = base 0x0, list 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
precessor eflags = interrupt disabled, resume, IOPL = 0
current process = 355 (csh)
interrupt mask = net tty bio cam
kernel : type 12 trap, code = 0
Stopped at ffs_vptofh+0xfe0: cmpw $0x2,0x3e(%edx)
and the trace :
db> trace
ffs_vptofh(c4546d5c,c4514300,1000,0,c4546cf4) at ffs_vptofh+0xfe0
end(c4546d5c) at 0xc087c485
vnode_pager_freepage(c4559a2c,c4546db8,1,0,c4546df8) at vnode_pager_freepage+0x556
vm_pager_get_pages(c4559a2c,c4546db8,1,0,c4546f18) at vm_pager_get_pages+0x1f
exec_map_first_page(c4546e94,c44c55a8,c02fe464,0,4) at exec_map_first_page+0xba
execve(c44c55a0,c4546f94,80922e0,80940000,8085000) at execve+0x19e
syscall(27,27,8085000,8094000,bfbffbb0) at syscall+0x187
Xint0x80_syscall() at Xint0x80_syscall+0x2c
(not too deep)
Given I have no swap (vm.swap_enabled=0), it is not easy to supply
vmcore. But I can provide any help as I can reproduce the crash at
will.
If someone has a clue on how to fix that...
Thierry
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