I just noticed a SIGSEG in tail.

The problem seems to be related to mmap.
The userland and kernel (1.5Y) were last built on Nov 23


Using kdump, I got this :

[root@moria tmp]# ktrace tail /var/log/maillog
Segmentation fault (core dumped)
[root@moria tmp]# kdump ktrace.out 
 13495 ktrace   EMUL  "netbsd"
 13495 ktrace   RET   ktrace 0
 13495 ktrace   CALL  execve(0x7fffe6b8,0x7fffeb78,0x7fffeb84)
 13495 ktrace   NAMI  "/usr/bin/tail"
 13495 ktrace   NAMI  "/usr/libexec/ld.elf_so"
 13495 tail     EMUL  "netbsd"
 13495 tail     RET   execve JUSTRETURN
 13495 tail     CALL  __sysctl(0x7fffe908,0x2,0x4181bf24,0x7fffe910,0,0)
 13495 tail     RET   __sysctl 0
 13495 tail     CALL  mmap(0,0x8000,0x3,0x1002,0xffffffff,0,0,0)
 13495 tail     RET   mmap 1099026432/0x4181d000
 13495 tail     CALL  geteuid
 13495 tail     RET   geteuid 0
 13495 tail     CALL  getuid
 13495 tail     RET   getuid 0
 13495 tail     CALL  getegid
 13495 tail     RET   getegid 0
 13495 tail     CALL  getgid
 13495 tail     RET   getgid 0
 13495 tail     CALL  open(0x4181a034,0,0x4181a034)
 13495 tail     NAMI  "/etc/ld.so.conf"
 13495 tail     RET   open -1 errno 2 No such file or directory
 13495 tail     CALL  __stat13(0x41820000,0x7fffe938)
 13495 tail     NAMI  "/usr/lib/libc.so.12"
 13495 tail     RET   __stat13 0
 13495 tail     CALL  open(0x41820000,0,0x8)
 13495 tail     NAMI  "/usr/lib/libc.so.12"
 13495 tail     RET   open 3
 13495 tail     CALL  read(0x3,0x7fffe9a8,0x34)
 13495 tail     GIO   fd 3 read 52 bytes
  [...snip data...]
 13495 tail     RET   read 52/0x34
 13495 tail     CALL  close(0x3)
 13495 tail     RET   close 0
 13495 tail     CALL  open(0x41820000,0,0x1)
 13495 tail     NAMI  "/usr/lib/libc.so.12"
 13495 tail     RET   open 3
 13495 tail     CALL  __fstat13(0x3,0x7fffe9a8)
 13495 tail     RET   __fstat13 0
 13495 tail     CALL  read(0x3,0x7fffd940,0x1000)
 13495 tail     GIO   fd 3 read 4088 bytes
  [...snip data...]
 13495 tail     GIO   fd 3 read 8 bytes
  [...snip data...]
 13495 tail     RET   read 4096/0x1000
 13495 tail     CALL  mmap(0,0xcc000,0x5,0x2,0x3,0,0,0)
 13495 tail     RET   mmap 1099059200/0x41825000
 13495 tail     CALL  mmap(0x418d3000,0x11000,0x7,0x12,0x3,0,0,0x9e000)
 13495 tail     RET   mmap 1099771904/0x418d3000
 13495 tail     CALL  mmap(0x418e4000,0xd000,0x7,0x1012,0xffffffff,0,0,0)
 13495 tail     RET   mmap 1099841536/0x418e4000
 13495 tail     CALL  munmap(0x418c4000,0xf000)
 13495 tail     RET   munmap 0
 13495 tail     CALL  close(0x3)
 13495 tail     RET   close 0
 13495 tail     CALL  __sysctl(0x4181af50,0x2,0x4181bf1c,0x7fffea48,0,0)
 13495 tail     RET   __sysctl 0
 13495 tail     CALL  open(0x7fffec21,0,0x1b6)
 13495 tail     NAMI  "/var/log/maillog"
 13495 tail     RET   open 3
 13495 tail     CALL  __fstat13(0x3,0x7fffea88)
 13495 tail     RET   __fstat13 0
 13495 tail     CALL  mmap(0,0x3d,0x1,0x1,0x3,0,0,0)
 13495 tail     RET   mmap 1099710464/0x418c4000
 13495 tail     CALL  munmap(0x418c4000,0x3d)
 13495 tail     RET   munmap 0
 13495 tail     CALL  mmap(0,0,0x1,0x1,0x3,0,0,0)
 13495 tail     RET   mmap 1098973184/0x41810000
 13495 tail     PSIG  SIGSEGV SIG_DFL
 13495 tail     NAMI  "tail.core"

What happened ?

Thanks,

-- 
Xavier HUMBERT  -  Systemes et Reseaux     |     labo-info@injep.fr
INJEP                                      |     humbert@injep.fr