Re: earmhf issues on Beaglebone Black

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Mon, Jul 21, 2014 at 10:52:45PM +0200, Manuel Bouyer wrote:
> [...]
> Here's a kdump related to one of these messages:
>    773      1 make     CALL  pipe
>    773      1 make     RET   pipe 3, 4
>    773      1 make     CALL  getpid
>    773      1 make     RET   getpid 773/0x305, 1223/0x4c7
>    773      1 make     CALL  __vfork14
>     85      1 make     EMUL  "netbsd"
>     85      1 make     RET   fork 0
>     85      1 make     CALL  close(3)
>     85      1 make     RET   close 0
>     85      1 make     CALL  dup2(4,1)
>     85      1 make     RET   dup2 1
>     85      1 make     CALL  close(4)
>     85      1 make     RET   close 0
>     85      1 make     CALL  execve(0x403124d0,0x7fffb6e8,0x7fffcb90)
>     85      1 make     NAMI  "/bin/sh"
>     85      1 make     NAMI  "/libexec/ld.elf_so"
>    773      1 make     RET   __vfork14 85/0x55
>    773      1 make     CALL  close(4)
>    773      1 make     RET   close 0
>    773      1 make     CALL  read(3,0x7fffb6f8,0x400)
>    773      1 make     GIO   fd 3 read 0 bytes
>        ""
>    773      1 make     RET   read 0
>    773      1 make     CALL  close(3)
>    773      1 make     RET   close 0
>    773      1 make     CALL  __wait450(0x55,0x7fffb6f8,0,0)
>    773      1 make     RET   __wait450 85/0x55
>    773      1 make     CALL  write(2,0x7fffb618,9)
>    773      1 make     GIO   fd 2 wrote 9 bytes
>        "make[3]: "
>    773      1 make     RET   write 9
>    773      1 make     CALL  write(2,0x465ab,1)
>    773      1 make     GIO   fd 2 wrote 1 bytes
>        "\""
>    773      1 make     RET   write 1
>    773      1 make     CALL  write(2,0x7fffb618,0x2a)
>    773      1 make     GIO   fd 2 wrote 42 bytes
>        "../../mk/compiler/../../mk/compiler/gcc.mk"
>    773      1 make     RET   write 42/0x2a
>    773      1 make     CALL  write(2,0x7fffb618,0xc)
>    773      1 make     GIO   fd 2 wrote 12 bytes
>        "\" line 168: "
>    773      1 make     RET   write 12/0xc
>    773      1 make     CALL  write(2,0x3144c,9)
>    773      1 make     GIO   fd 2 wrote 9 bytes
>        "warning: "
>    773      1 make     RET   write 9
>    773      1 make     CALL  write(2,0x7fffb648,0x6d)
>    773      1 make     GIO   fd 2 wrote 109 bytes
>        "\"( env LC_ALL=C /usr/bin/gcc -v 2>&1 | /usr/bin/grep 'gcc version') 
> 2\
>         >/dev/null || echo 0\" exited on a signal"
>    773      1 make     RET   write 109/0x6d
> 
> Maybe it's related to vfork ?

Here's a "normal" vfork sequence from make:
    35      1 make     CALL  __vfork14
    34      1 make     EMUL  "netbsd"
    34      1 make     RET   fork 0
    34      1 make     CALL  execve(0x7fffb9cc,0x4034e050,0x40310100)
    34      1 make     NAMI  "/sbin/cc"
    34      1 make     RET   execve -1 errno 2 No such file or directory
    34      1 make     CALL  execve(0x7fffb9cc,0x4034e050,0x40310100)
    34      1 make     NAMI  "/usr/sbin/cc"
    34      1 make     RET   execve -1 errno 2 No such file or directory
    34      1 make     CALL  execve(0x7fffb9cc,0x4034e050,0x40310100)
    34      1 make     NAMI  "/bin/cc"
    34      1 make     RET   execve -1 errno 2 No such file or directory
    34      1 make     CALL  execve(0x7fffb9cc,0x4034e050,0x40310100)
    34      1 make     NAMI  "/usr/bin/cc"
    34      1 make     NAMI  "/usr/libexec/ld.elf_so"
    34      1 cc       EMUL  "netbsd"
    34      1 cc       RET   execve JUSTRETURN
    35      1 make     RET   __vfork14 34/0x22
    35      1 make     CALL  __wait450(0xffffffff,0x7fffbe1c,0,0)
    34      1 cc       CALL  mmap(0,0x8000,3,0x1002,0xffffffff,0,0,0)
    34      1 cc       RET   mmap 1074544640/0x400c4000
    34      1 cc       CALL  open(0x400ae5b8,0,0x400c2648)

So it looks like the fault happens inside the execve(), but before the
new executable has actually been loaded (which could explain
why there's no core dump). 

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--