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SubjectRe: Oops after removing PCMCIA modem with low latency patch
On Fri, Aug 30, 2002 at 03:53:06PM -0700, Andrew Morton wrote:
> Diego Biurrun wrote:
> >
> > I just tried your 2.4.19-low-latency patch on a stock 2.4.19 kernel and
> > my box oopses when I manually remove my PCMCIA modem.
>
> Yup. The pcmcia drivers like to call sleeping devfs functions
> from within a timer handler. The kernel tries to perform a
> context switch in interrupt context and bugs out. This can happen
> without the low-latency patch, but doesn't.
>
> The fix for that is to change the (strange) deferred deregister thing
> in several of the CardServices drivers to punt the activity up to
> process context via schedule_task(), but nobody has done that yet.
>
> Probably, you can add
>
> if (in_interrupt())
> return;
>
> to schedule() to make the BUGs go away. Not using devfs makes
> them go away too - but it is not a devfs bug.

Thanks for the ultraquick reply. I managed to get another oops trace
from within (shudder) Windows Hyperterminal, I am sending this along
just in case it may help you. Adding the two lines you mention to
sched.c also fixed the problem.
Thank you!

Diego Biurrun
ksymoops 2.4.5 on i586 2.4.19. Options used
-V (default)
-k ksyms (specified)
-l modules (specified)
-o /lib/modules/2.4.19/ (default)
-m /boot/System.map-2.4.19 (default)

kernel BUG at sched.c:577!
invalid operand: 0000
CPU: 0
EIP: 0010:[<c0112de9>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010082
eax: 00000018 ebx: c024a000 ecx: c3446000 edx: 00000001
esi: 00000000 edi: c27fda00 ebp: c024be18 esp: c024bdf4
ds: 0018 es: 0018 ss: 0018
Process swapper (pid: 0, stackpage=c024b000)
Stack: c01ed4de c024a000 00000000 c27fda00 c11f2ba0 00000001 00000000 c024a000
c0164127 c024be20 c0113d15 c364653c c013272f c27fda00 00000000 c0215860
c364653c c0142647 c27fda00 c27fda00 c0143046 c27fda00 c35d5620 c278b3a0
Call Trace: [<c0164127>] [<c0113d15>] [<c013272f>] [<c0142647>] [<c0143046>]
[<c0165bad>] [<c0140cc3>] [<c01643b0>] [<c01649ba>] [<c0164a0f>] [<c016e1ef>]
[<c0115aa3>] [<c01159e7>] [<c0181136>] [<c725cd4a>] [<c725cd1c>] [<c011c94f>]
[<c0119482>] [<c01193b6>] [<c01191ca>] [<c0109b9d>] [<c0106d10>] [<c010bd28>]
[<c0106d10>] [<c0106d33>] [<c0106d97>] [<c0105000>] [<c0105027>]
Code: 0f 0b 41 02 d6 d4 1e c0 83 c4 04 8b 4d f4 c1 e1 05 81 c1 40


>>EIP; c0112de9 <schedule+4d/2f4> <=====

>>ebx; c024a000 <init_task_union+0/2000>
>>ecx; c3446000 <_end+31b73ac/6f9f3ac>
>>edi; c27fda00 <_end+256edac/6f9f3ac>
>>ebp; c024be18 <init_task_union+1e18/2000>
>>esp; c024bdf4 <init_task_union+1df4/2000>

Trace; c0164127 <_devfs_walk_path+5f/d4>
Trace; c0113d15 <set_running_and_schedule+1d/24>
Trace; c013272f <invalidate_inode_buffers+1b/88>
Trace; c0142647 <clear_inode+b/b0>
Trace; c0143046 <iput+d6/1ac>
Trace; c0165bad <devfs_d_iput+59/68>
Trace; c0140cc3 <dput+c3/124>
Trace; c01643b0 <free_dentry+3c/44>
Trace; c01649ba <_devfs_unregister+36/74>
Trace; c0164a0f <devfs_unregister+17/24>
Trace; c016e1ef <tty_unregister_devfs+43/50>
Trace; c0115aa3 <release_console_sem+73/78>
Trace; c01159e7 <printk+ff/114>
Trace; c0181136 <unregister_serial+5e/7c>
Trace; c725cd4a <[serial_cs]serial_release+2e/80>
Trace; c725cd1c <[serial_cs]serial_release+0/80>
Trace; c011c94f <timer_bh+26b/384>
Trace; c0119482 <bh_action+1a/40>
Trace; c01193b6 <tasklet_hi_action+4a/70>
Trace; c01191ca <do_softirq+5a/ac>
Trace; c0109b9d <do_IRQ+a1/b4>
Trace; c0106d10 <default_idle+0/28>
Trace; c010bd28 <call_do_IRQ+5/d>
Trace; c0106d10 <default_idle+0/28>
Trace; c0106d33 <default_idle+23/28>
Trace; c0106d97 <cpu_idle+3f/54>
Trace; c0105000 <_stext+0/0>
Trace; c0105027 <rest_init+27/28>

Code; c0112de9 <schedule+4d/2f4>
00000000 <_EIP>:
Code; c0112de9 <schedule+4d/2f4> <=====
0: 0f 0b ud2a <=====
Code; c0112deb <schedule+4f/2f4>
2: 41 inc %ecx
Code; c0112dec <schedule+50/2f4>
3: 02 d6 add %dh,%dl
Code; c0112dee <schedule+52/2f4>
5: d4 1e aam $0x1e
Code; c0112df0 <schedule+54/2f4>
7: c0 83 c4 04 8b 4d f4 rolb $0xf4,0x4d8b04c4(%ebx)
Code; c0112df7 <schedule+5b/2f4>
e: c1 e1 05 shl $0x5,%ecx
Code; c0112dfa <schedule+5e/2f4>
11: 81 c1 40 00 00 00 add $0x40,%ecx

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