lowlatency-2.2.14-B1 crashes during disk I/O, Oopses

Benno Senoner (sbenno@gardena.net)
Tue, 8 Feb 2000 20:57:00 +0100

Hi,
I tested the lowlatency-2.2.14-B1 patch,
but unfortunately it crashes on both of my testboxes here:
The test was a latencytest session and both boxes crashed (Oops) during the
disk I/O tests:

here the output of my Celeron box: (UP kernel) EIDE IBM harddisk
soundcard Soundblaster Live!

--
Feb  8 17:40:15 smp kernel: Unable to handle kernel NULL pointer dereference
  at virtual address 0000026c Feb  8 17:40:15 smp kernel: current->tss.cr3 =
  00101000, %cr3 = 00101000 Feb  8 17:40:15 smp kernel: *pde = 00000000
Feb  8 17:40:15 smp kernel: Oops: 0000
Feb  8 17:40:15 smp kernel: CPU:    0

---




here the output of my P133 with EIDE IBM HD, soundcard TB Tropez+

---
Feb  8 19:31:12 goblin kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000025 
Feb  8 19:31:12 goblin kernel: current->tss.cr3 = 00101000, %cr3 = 00101000 
Feb  8 19:31:12 goblin kernel: *pde = 00000000 
Feb  8 19:31:12 goblin kernel: Oops: 0000 
Feb  8 19:31:12 goblin kernel: CPU:    0 
Feb  8 19:31:12 goblin kernel: EIP:    0010:[vmalloc+18/92] 
Feb  8 19:31:12 goblin kernel: EFLAGS: 00010206 
Feb  8 19:31:12 goblin kernel: eax: 00000011   ebx: c0316020   ecx: 00000c18   edx: 00008000 
Feb  8 19:31:12 goblin kernel: esi: 00000011   edi: 00000011   ebp: c0316020   esp: c3efffa8 
Feb  8 19:31:12 goblin kernel: ds: 0018   es: 0018   ss: 0018 
Feb  8 19:31:12 goblin kernel: Process kswapd (pid: 5, process nr: 5, stackpage=c3eff000) 
Feb  8 19:31:12 goblin kernel: Stack: 000000cf 00000e00 c011cb8a c0316020 0000000b 00000006 00000030 c012196e  
Feb  8 19:31:13 goblin kernel:        00000006 00000030 c3efe000 c01d198e c3efe1c1 c0121a27 00000030 00000f00  
Feb  8 19:31:13 goblin kernel:        c3ff9fc0 c0106000 c0107c4b 00000000 00000f00 c0213fd8  
Feb  8 19:31:13 goblin kernel: Call Trace: [sys_wait4+602/984] [copy_page_range+354/484] [rs_interrupt+406/1200] [zap_page_range+55/452] [get_options+0/116] [sys_sigaction+103/1044]  
Feb  8 19:31:13 goblin kernel: Code: 8b 76 14 83 78 20 00 75 06 f6 40 18 46 74 0f 6a 00 e8 6c 01  
Feb  8 19:31:36 goblin kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000000 
Feb  8 19:31:36 goblin kernel: current->tss.cr3 = 006b7000, %cr3 = 006b7000 
Feb  8 19:31:36 goblin kernel: *pde = 00000000 
Feb  8 19:31:36 goblin kernel: Oops: 0000 
Feb  8 19:31:36 goblin kernel: CPU:    0 
Feb  8 19:31:36 goblin kernel: EIP:    0010:[do_acct_process+531/712] 
-----




any thoughts ?


PS: 2.2.14 feels much faster during the disk I/O tests of latencytest.
In fact when you access to the KDE menu bars there is much less "swap-in" of
the executable pages than in 2.2.10.
New buffer cache algorithm ? (my disk I/O accesses are all sequential)
 


Benno.


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