2.5.75, 8250 Oops

Hi!

pppd was trying to open /dev/ttyS0 (persist & maxfail 0, etc.), but I had not created alias for it....

Jul 12 01:29:19 finwe pppd[643]: Failed to open /dev/ttyS0: No such device

...so I manually loaded 8250 and:

Serial: 8250/16550 driver $Revision: 1.90 $ IRQ sharing disabled ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A

 Unable to handle kernel NULL pointer dereference at virtual address 00000014
  printing eip:
 d08c6b21
 *pde = 00000000
 Oops: 0000 [#1]
 CPU:    0
 EIP:    0060:[_end+274047177/1070142888]    Not tainted
 EFLAGS: 00010282
 EIP is at uart_close+0x11/0x200 [core]
 eax: d08c6b10   ebx: cbdfe000   ecx: 00000000   edx: cee66000
 esi: cbbe6600   edi: 00000000   ebp: cbdfe000   esp: cec79e58
 ds: 007b   es: 007b   ss: 0068
 Process pppd (pid: 643, threadinfo=cec78000 task=c139f980)
 Stack: 00000000 c01bb9d5 ffffffff cbbe6600 00000000 cbdfe000 cbbe6600 00000001 
        00000000 c01bb4c1 cbdfe000 cbbe6600 00000000 d08c9bc0 c010822c d08c9bc0 
        00000000 00000004 d08c84a6 d08b7b8e 00000001 00000000 00000004 00000000 
 Call Trace:
  [tty_fasync+133/320] tty_fasync+0x85/0x140
  [release_dev+1777/1840] release_dev+0x6f1/0x730
  [__down_failed+8/12] __down_failed+0x8/0xc
  [_end+274053710/1070142888] .text.lock.core+0xcd/0x1a5 [core]
  [_end+274049152/1070142888] uart_open+0x58/0x160 [core]
  [tty_open+300/880] tty_open+0x12c/0x370
  [chrdev_open+242/544] chrdev_open+0xf2/0x220
  [dentry_open+336/528] dentry_open+0x150/0x210
  [filp_open+104/112] filp_open+0x68/0x70
  [sys_open+91/144] sys_open+0x5b/0x90
  [syscall_call+7/11] syscall_call+0x7/0xb
 
 Code: 8b 47 14 89 44 24 10 b8 00 e0 ff ff 21 e0 8b 00 8b 40 14 85 

ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A

Linux finwe 2.5.75 #1 Fri Jul 11 01:02:39 CEST 2003 i686 GNU/Linux

processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 11
model name : Intel(R) Celeron(TM) CPU 1300MHz
stepping : 1
cpu MHz : 1305.846
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse
bogomips : 2580.48

Gnu C                  3.3.1
Gnu make               3.80
util-linux             2.11z
mount                  2.11z
e2fsprogs              1.34-WIP
jfsutils               1.1.1
xfsprogs               2.4.12
PPP                    2.4.1
Linux C Library        2.3.1
Dynamic linker (ldd)   2.3.1
Procps                 3.1.9
Net-tools              1.60
Console-tools          0.2.3
Sh-utils               5.0

config: http://zeus.polsl.gliwice.pl/~jfk/kernel/2.5.75/config1

jk :)

Jacek Kawa