Re: kernel panic on smb activity

Kris Kennaway wrote:

> What backtrace, or which source code line is it faulting at (use
> addr2line)?
> 
> P.S. Please try to be proactive with this kind of information

Just recompiled my kernel with debug symbols and DDB, these are the 
relevant info:

Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0xc
fault code              = supervisor write, page not present
instruction pointer     = 0x8:0xc05b4805
stack pointer           = 0x10:0xd3655a40
frame pointer           = 0x10:0xd3655a8c
code segment            = base 0x0, limit 0xfffff, type 0x1b
                         = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 672 (cp)
kernel: type 12 trap, code=0
Stopped at      m_getm+0xa5:    movl    $0,0xc(%ecx)
db> trace
m_getm(c180fe00,508,2,1,c180fe6f) at m_getm+0xa5
mb_put_mem(c1bba718,28163090,508,1,1) at mb_put_mem+0xb9
mb_put_uio(c1bba718,d3655c80,598,0,4000) at mb_put_mem+0xb9
smb_write(c1bba800,4000,d3655c80,d3655b80,c05cce88) at smb_write+0x414
smbfs_writevnode(c1c15208,d3655c80,c1bf7b80,20001,0) at 
smbfs_writevnode+0x1a1
smbfs_write(d3655be4,20002,c1840dc0,c1626588,1) at smbfs_write+0x41
vn_write(c1845bb0,d3655c80,c1bf7b80,0,c1840dc0) at vn_write+0x1bb
dofilewrite(c1840dc0,c1845bb0,4,28163000,598) at dofilewrite+0xec
write(c1840dc0,d3655d14,c,4,3) at write+0x7d
syscall(2f,2f,2f,28163000,598) at syscall+0x1e0
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (4, FreeBSD ELF32, write), eip = 0x280cde8f, esp = 
0xbfbfea8c, ebp = 0xbfbfead8 ---

(kgdb) l *m_getm+0xa5
0xc05b4805 is in m_getm (/usr/src/sys/kern/uipc_mbuf.c:128).
123             if (num > 0) {
124                     if ((top = cur = m_getcl(how, type, 0)) == NULL)
125                             goto failed;
126             }
127             num--;
128             top->m_len = 0;
129
130             for (i = 0; i < num; i++) {
131                     mb = m_getcl(how, type, 0);
132                     if (mb == NULL)

--
Alex Dupre