Re: kern/41288: FreeBSD emulation stop working

[David Holland <dholland-bugs%netbsd.org@localhost>]

The following reply was made to PR kern/41288; it has been noted by GNATS.

From: David Holland <dholland-bugs%netbsd.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/41288: FreeBSD emulation stop working
Date: Wed, 31 Mar 2010 03:01:33 +0000

 (send to gnats-admin instead of gnats-bugs)
 
    ------
 
 From: Takahiro Kambe <taca%back-street.net@localhost>
 To: gnats-admin%netbsd.org@localhost
 Subject: Re: kern/41288: FreeBSD emulation stop working
 Date: Fri, 26 Mar 2010 00:46:18 +0900 (JST)
 
 I found that this problem happened by processing shared libraries of
 FreeBSD.
 
 Here is dynamic linked program:
 
 % ktrace -di -t A ./motd
   2080      1 ktrace   EMUL  "netbsd"
   2080      1 ktrace   RET   ktrace 0
   2080      1 ktrace   CALL  execve(0xbfbffca8,0xbfbfeb7c,0xbfbfeb84)
   2080      1 ktrace   NAMI  "./motd"
   2080      1 ktrace   CSW   stop kernel
   2080      1 ktrace   CSW   resume kernel
   2080      1 ktrace   ARG   "./motd"
   2080      1 ktrace   ENV   "XMODIFIERS=@im=uim"
   2080      1 ktrace   ENV   "PWD=/data/tmp/freebsd228"
 ...
   2080      1 ktrace   ENV   "PAGER=less"
   2080      1 ktrace   ENV   "EDITOR=vi"
   2080      1 ktrace   ENV   "_=/usr/bin/ktrace"
   2080      1 motd     NAMI  "/emul/freebsd"
   2080      1 motd     EMUL  "freebsd"
   2080      1 motd     RET   syscall JUSTRETURN
   2080      1 motd     CALL  open(0x109c,0,0)
   2080      1 motd     NAMI  "/emul/freebsd/usr/libexec/ld.so"
   2080      1 motd     RET   open 3, -1077937132/0xbfbffc14
   2080      1 motd     PSIG  SIGSEGV SIG_DFL: code=SEGV_MAPERR, addr=0x3, 
trap=6)
   2080      1 motd     NAMI  "motd.core"
   2080      1 motd     CSW   stop kernel
   2080      1 motd     CSW   resume kernel
   2080      1 motd     CSW   stop kernel
   2080      1 motd     CSW   resume kernel
 [2]    2743 segmentation fault (core dumped)  ktrace -id -t A ./motd
 
 When the same program which statically linked on FreeBSD:
 
 % ktrace -id -t A ./motd.static
 % kdump
   3323      1 ktrace   EMUL  "netbsd"
   3323      1 ktrace   RET   ktrace 0
   3323      1 ktrace   CALL  execve(0xbfbffca4,0xbfbfeb78,0xbfbfeb80)
   3323      1 ktrace   NAMI  "./motd.static"
   3323      1 ktrace   ARG   "./motd.static"
   3323      1 ktrace   ENV   "XMODIFIERS=@im=uim"
   3323      1 ktrace   ENV   "PWD=/data/tmp/freebsd228"
 ...
   3323      1 ktrace   ENV   "PAGER=less"
   3323      1 ktrace   ENV   "EDITOR=vi"
   3323      1 ktrace   ENV   "_=/usr/bin/ktrace"
   3323      1 motd.static NAMI  "/emul/freebsd"
   3323      1 motd.static EMUL  "freebsd"
   3323      1 motd.static RET   syscall JUSTRETURN
   3323      1 motd.static CALL  open(0x10c0,0,0)
   3323      1 motd.static NAMI  "/emul/freebsd/etc/motd"
   3323      1 motd.static RET   open 3, 8284/0x205c
   3323      1 motd.static CALL  close(3)
   3323      1 motd.static RET   close 0, 8284/0x205c
   3323      1 motd.static CALL  exit(0)
 
 This program simply open /etc/motd, close it and end.
 
 -- 
 Takahiro Kambe <taca%back-street.net@localhost>