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From: DaveC (freevsd_at_comm.it)
Date: Sat 22 Feb 2003 - 09:39:35 GMT

> It shouldn't do; spinlocks are placed around every access to the new
> structures I have set up.

I am receiving a consistent crash with both smp and non smp kernels.
Attached is a log from a crash with an UP kernel.
The kernel is a 2.4.20 + ac2 + ctx16 + your patch.
The patches were applied in this order. ctx16 had the normal rejects
expected because of the O(1) scheduler.

To crash, I start 1 vserver and enter the context. A few commands later
(ps ax/df etc) the kernel crashes consistently.

Here's the log filtered trough ksymoops:

Unable to handle kernel paging request at virtual address f8cb7000
*pde = 034f9067
Oops: 0000
CPU: 0
EIP: 0010:[<c0123c30>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246
eax: c0255800 ebx: c0255800 ecx: f8cb7000 edx: 00000000
esi: 0000063a edi: f5e38000 ebp: 00005410 esp: f578ff3c
ds: 0018 es: 0018 ss: 0018
Process bash (pid: 1542, stackpage=f578f000)
Stack: f5c92000 c011a9a8 f8cb7000 0000063a f578e000 c016f1f6 0000063a
       bffff7c4 f5e38000 c016f5e8 f5e38000 f5e38000 bffff7c4 00000000
       00000000 00000000 00005410 ffffffe7 bffff7c4 c34905e0 c0147217
Call Trace: [<c011a9a8>] [<c016f1f6>] [<c016f5e8>] [<c0147217>]
Code: 8b 01 48 85 c0 89 01 75 07 51 e8 b1 af 00 00 58 89 d8 ba ff

>>EIP; c0123c30 <sys_release_ip_info+20/50> <=====
Trace; c011a9a8 <session_of_pgrp+48/70>
Trace; c016f1f6 <tiocspgrp+66/90>
Trace; c016f5e8 <tty_ioctl+258/370>
Trace; c0147217 <sys_ioctl+217/230>
Trace; c010883b <system_call+33/38>
Code; c0123c30 <sys_release_ip_info+20/50>
00000000 <_EIP>:
Code; c0123c30 <sys_release_ip_info+20/50> <=====
   0: 8b 01 mov (%ecx),%eax <=====
Code; c0123c32 <sys_release_ip_info+22/50>
   2: 48 dec %eax
Code; c0123c33 <sys_release_ip_info+23/50>
   3: 85 c0 test %eax,%eax
Code; c0123c35 <sys_release_ip_info+25/50>
   5: 89 01 mov %eax,(%ecx)
Code; c0123c37 <sys_release_ip_info+27/50>
   7: 75 07 jne 10 <_EIP+0x10> c0123c40
Code; c0123c39 <sys_release_ip_info+29/50>
   9: 51 push %ecx
Code; c0123c3a <sys_release_ip_info+2a/50>
   a: e8 b1 af 00 00 call afc0 <_EIP+0xafc0> c012ebf0
Code; c0123c3f <sys_release_ip_info+2f/50>
   f: 58 pop %eax
Code; c0123c40 <sys_release_ip_info+30/50>
  10: 89 d8 mov %ebx,%eax
Code; c0123c42 <sys_release_ip_info+32/50>
  12: ba ff 00 00 00 mov $0xff,%edx


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