kern/54804: compat_30_socket not implemented on 9.0_RC1

[Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>]

>Number:         54804
>Category:       kern
>Synopsis:       compat_30_socket not implemented on 9.0_RC1
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Dec 28 14:50:00 +0000 2019
>Originator:     Izumi Tsutsui
>Release:        NetBSD 9.0_RC1
>Organization:
>Environment:
System: NetBSD mirage 9.0_RC1 NetBSD 9.0_RC1 (GENERIC) #9: Tue Dec 24 20:50:30 JST 2019 tsutsui@mirage:/s/netbsd-9/src/sys/arch/i386/compile/GENERIC i386
Architecture: i386
Machine: i386
>Description:
An old binary "xbat" in my machine (maybe built on NetBSD/i386 1.2)
dumps core due to compat_30 issue:

---
% ls -Fla `which xbat`
-rwxr-xr-x  1 root  wheel  81920 Mar  1  1997 /usr/local/bin/xbat*
% file `which xbat`
/usr/local/bin/xbat: a.out NetBSD/i386 demand paged dynamically linked executable
% /usr/local/bin/xbat
Bad system call (core dumped)
% ktrace /usr/local/bin/xbat
Bad system call (core dumped)
% kdump
 :

 10760      1 xbat     CALL  open(0xa0014a7f,0,0)
 10760      1 xbat     NAMI  "/var/run/ld.so.hints"
 10760      1 xbat     RET   open 4
 10760      1 xbat     CALL  compat_30___fstat13(4,0xbfbfeb38)
 10760      1 xbat     RET   compat_30___fstat13 0
 10760      1 xbat     CALL  mmap(0,0x2000,PROT_READ,0x2<PRIVATE,FILE,ALIGN=NONE
>,4,0,0,0)
 10760      1 xbat     RET   mmap -1610444800/0xa0029000

 :

 10760      1 xbat     CALL  geteuid
 10760      1 xbat     RET   geteuid 100/0x64
 10760      1 xbat     CALL  compat_30___stat13(0xa010370c,0xbfbfeabc)
 10760      1 xbat     NAMI  "/etc/pwd.db"
 10760      1 xbat     RET   compat_30___stat13 0
 10760      1 xbat     CALL  open(0xa010370c,0,0)
 10760      1 xbat     NAMI  "/etc/pwd.db"
 10760      1 xbat     RET   open 3

 :

 10760      1 xbat     CALL  ioctl(3,TIOCGETA,0xbfbfea60)
 10760      1 xbat     RET   ioctl -1 errno 25 Inappropriate ioctl for device
 10760      1 xbat     CALL  compat_30___fstat13(3,0xbfbfe9dc)
 10760      1 xbat     RET   compat_30___fstat13 0
 10760      1 xbat     CALL  break(0x2f000)
 10760      1 xbat     RET   break 0

 :

 10760      1 xbat     RET   pread 4096/0x1000
 10760      1 xbat     CALL  close(3)
 10760      1 xbat     RET   close 0
 10760      1 xbat     CALL  __sysctl(0xbfbfe7ec,2,0xbfbfe838,0xbfbfe7e8,0,0)
 10760      1 xbat     RET   __sysctl 0
 10760      1 xbat     CALL  compat_30_socket(1,1,0)
 10760      1 xbat     RET   compat_30_socket -1 errno 78 Function not implemented
 10760      1 xbat     PSIG  SIGSYS SIG_DFL: code=SI_NOINFO
 10760      1 xbat     NAMI  "xbat.core"
% 
---

>How-To-Repeat:
Exec old binaries around NetBSD/i386 1.2?

>Fix:
No idea why only COMPAT_30 sys_socket() fails.

---
Izumi Tsutsui