[uml-devel] Re: problems with UML -- new data with memory debugging on

[Chris Friesen <cfriesen@nortelnetworks.com>]

I turned on memory debugging, and got the following.  Line 1439 in 
slab.c is

/* Either write before start, or a double free. */

Here's the backtrace:

Breakpoint 1, panic (fmt=0xa01e2d8a "kernel BUG at %s:%d!\n") at panic.c:60
60              bust_spinlocks(1);
(gdb) bt
#0  panic (fmt=0xa01e2d8a "kernel BUG at %s:%d!\n") at panic.c:60
#1  0xa002dc8a in kfree (objp=0xa032c89c) at slab.c:1439
#2  0xa0103ac8 in hostfs_read_super (sb=0xaf332400, data=0xaf036000, 
silent=0)
     at hostfs_kern.c:932
#3  0xa003cae9 in get_sb_nodev (fs_type=0xa022d62c, flags=0,
     dev_name=0xaf037000 "none", data=0xaf036000) at super.c:756
#4  0xa003cc82 in do_kern_mount (fstype=0xaf0d8000 "hostfs", flags=0,
     name=0xaf037000 "none", data=0xaf036000) at super.c:808
#5  0xa004fd62 in do_add_mount (nd=0xaefcbb94, type=0xaf0d8000 "hostfs",
     flags=0, mnt_flags=0, name=0xaf037000 "none", data=0xaf036000)
     at namespace.c:626
#6  0xa0050049 in do_mount (dev_name=0xaf037000 "none",
     dir_name=0xaff46000 "/vob/neptune", type_page=0xaf0d8000 "hostfs",
     flags=3236757504, data_page=0xaf036000) at namespace.c:740
#7  0xa0050416 in sys_mount (dev_name=0x8059e20 "none",
     dir_name=0x8059e30 "/vob/neptune", type=0x8059e48 "hostfs",
     flags=3236757504, data=0x8059eb8) at namespace.c:853
#8  0xa00da41c in execute_syscall_tt (r=0xaefc8274) at syscall_kern.c:120
#9  0xa00da4d9 in syscall_handler_tt (sig=12, regs=0xaefc8274)
     at syscall_user.c:37
#10 0xa00db5eb in sig_handler_common_tt (sig=12, sc_ptr=0xaefcbd28)
     at trap_user.c:37
#11 0xa00d7d0d in sig_handler (sig=12, sc=
---Type <return> to continue, or q <return> to quit---
       {gs = 0, __gsh = 0, fs = 0, __fsh = 0, es = 43, __esh = 0, ds = 
43, __dsh = 0, edi = 134586040, esi = 3236757504, ebp = 2684353448, esp 
= 2684353408, ebx = 134585888, edx = 134585928, ecx = 134585904, eax = 
4294967258, trapno = 14, err = 4, eip = 1074791518, cs = 35, __csh = 0, 
eflags = 582, esp_at_signal = 2684353408, ss = 43, __ssh = 0, fpstate = 
0xaefcbd80, oldmask = 134283264, cr2 = 1074791488}) at trap_user.c:101
#12 <signal handler called>
#13 0x4010045e in ?? ()
#14 0x0804a8b8 in ?? ()
#15 0x0804b4d1 in ?? ()
#16 0x0804c125 in ?? ()
#17 0x0804cf1d in ?? ()
#18 0x4002f9a7 in ?? ()


-- 
Chris Friesen                    | MailStop: 043/33/F10
Nortel Networks                  | work: (613) 765-0557
3500 Carling Avenue              | fax:  (613) 765-2986
Nepean, ON K2H 8E9 Canada        | email: cfriesen@nortelnetworks.com



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