[uml-user] Issues using hostfs + NFS mount

[David C. <da...@so...>]

I'm trying to use hostfs to mount a directory which is NFS mounted on the
host. Mounts fine, but as soon as I try to do anything to it (e.g. ls), I
get a kernel panic. I've been able to reproduce it every time I've tried,
apart from the occasions when I got a "tty_read read failed, errno = 0"
before I could login (seems to be from the 'debug' option, as it's fine
without it). hostfs works if I mount a regular filesystem on the host, but
promptly panics when I cd into the previously mentioned NFS mount.

This is 2.4.5-um11 - Not yet tried it on any other 2.4.5 patch.

Thanks.

(gdb)
#0  panic (fmt=0x1015500a "Kernel stack overflow") at panic.c:47
#1  0x100db8c0 in segv (address=1463049980, ip=269442198, is_write=2,
    is_user=1) at trap_kern.c:68
#2  0x100dc46c in segv_handler (sig=11, sc=0x57347d28, usermode=1)
    at trap_user.c:296
#3  0x100dc59c in sig_handler (sig=11, sc={gs = 0, __gsh = 0, fs = 0,
      __fsh = 0, es = 43, __esh = 0, ds = 43, __dsh = 0, edi = 15,
      esi = 270326416, ebp = 1463057904, esp = 1463049984, ebx =
1463049984,
      edx = 7865, ecx = 1463049984, eax = 1889787904, trapno = 14, err =
6,
      eip = 269442198, cs = 35, __csh = 0, eflags = 66054,
      esp_at_signal = 1463049984, ss = 43, __ssh = 0, fpstate =
0x57347d80,
      oldmask = 0, cr2 = 1463049980}) at trap_user.c:338
#4  0x100e70f8 in __restore ()
    at ../sysdeps/unix/sysv/linux/i386/sigaction.c:127
#5  0x0 in ?? ()
(gdb) i sym 269442198
__getdents + 70 in section .text
(gdb) i line *269442198
Line 84 of "../sysdeps/unix/sysv/linux/getdents.c"
   starts at address 0x100f5c8e <__getdents+62>
   and ends at 0x100f5cc1 <__getdents+113>.
(gdb)


-- 
David Coulson                                  http://davidcoulson.net/
da...@so...                  http://journal.davidcoulson.net/