Re: Low latency for recent kernels

rwhron
2002-01-23T14:13:40Z

> http://www.zip.com.au/~akpm/linux/2.4.18-pre6-low-latency.patch.gz

2.4.18-pre3 with 2.4.17-low-latency.patch worked fine on this system
2.4.18-pre6 with 2.4.18-pre6-low-latency.patch panics at boot time.
2.4.18-pre6 is fine also.

System has reiserfs root filesystem. No modules.
/usr/src/linux/System.map was the System.map for 2.4.18pre6ll for
the ksymoops below.

No modules in ksyms, skipping objects
No ksyms, skipping lsmod
Kernel panic: can't allocate root vfsmount
<1>Unable to handle kernel NULL pointer dereference at virtual address 0000002c
c01234d3
*pde = 00000000
Oops: 0000
CPU: 0
EIP: 0010:[<c01234d3>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010046
eax: 00000000 ebx: 00000008 ecx: 00000000 edx: 00000073
esi: 00000000 edi: 00000018 ebp: 00000020 esp: c0215e78
ds: 0018 es: 0018 ss: 0018
Process . (pid: -1072541344, stackpage=c0215000)
Stack: 00000018 00000001 00000018 c0214568 c0117e6c 00000000 00000020 c0214000
00000018 00000018 00000000 c0117f4c 00000018 00000001 c0214568 00000086
00000018 c0214000 c0117ff4 00000018 00000001 c0214000 01ebb409 c0214000
Call Trace: [<c0117e6c>] [<c0117f4c>] [<c0117ff4>] [<c0118253>] [<c0117208>]
[<c0117291>] [<c011759f>] [<c010a889>] [<c0107d1c>] [<c0107e82>] [<c0105000>]
[<c0109c18>] [<c0105000>] [<c0112020>]
Code: f6 46 2c 01 74 02 0f 0b 9c 5f fa 8b 4e 08 39 d9 75 22 8b 4e

>>EIP; c01234d2 <kmem_cache_alloc+2a/b8> <=====
Trace; c0117e6c <send_signal+2c/f0>
Trace; c0117f4c <deliver_signal+1c/50>
Trace; c0117ff4 <send_sig_info+74/88>
Trace; c0118252 <send_sig+1a/20>
Trace; c0117208 <update_one_process+68/d4>
Trace; c0117290 <update_process_times+1c/88>
Trace; c011759e <do_timer+22/70>
Trace; c010a888 <timer_interrupt+60/10c>
Trace; c0107d1c <handle_IRQ_event+30/5c>
Trace; c0107e82 <do_IRQ+6a/a8>
Trace; c0105000 <_stext+0/0>
Trace; c0109c18 <call_do_IRQ+6/e>
Trace; c0105000 <_stext+0/0>
Trace; c0112020 <panic+c0/d0>
Code; c01234d2 <kmem_cache_alloc+2a/b8>
00000000 <_EIP>:
Code; c01234d2 <kmem_cache_alloc+2a/b8> <=====
0: f6 46 2c 01 testb $0x1,0x2c(%esi) <=====
Code; c01234d6 <kmem_cache_alloc+2e/b8>
4: 74 02 je 8 <_EIP+0x8> c01234da <kmem_cache_alloc+32/b8>
Code; c01234d8 <kmem_cache_alloc+30/b8>
6: 0f 0b ud2a
Code; c01234da <kmem_cache_alloc+32/b8>
8: 9c pushf
Code; c01234da <kmem_cache_alloc+32/b8>
9: 5f pop %edi
Code; c01234dc <kmem_cache_alloc+34/b8>
a: fa cli
Code; c01234dc <kmem_cache_alloc+34/b8>
b: 8b 4e 08 mov 0x8(%esi),%ecx
Code; c01234e0 <kmem_cache_alloc+38/b8>
e: 39 d9 cmp %ebx,%ecx
Code; c01234e2 <kmem_cache_alloc+3a/b8>
10: 75 22 jne 34 <_EIP+0x34> c0123506 <kmem_cache_alloc+5e/b8>
Code; c01234e4 <kmem_cache_alloc+3c/b8>
12: 8b 4e 00 mov 0x0(%esi),%ecx

<0>Kernel panic: Aiee, killing interrupt handler!

--
Randy Hron