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SubjectRe: [patch] Real-Time Preemption, -RT-2.6.9-rc4-mm1-U8
Ingo Molnar wrote:
> i have released the -U8 Real-Time Preemption patch:
>
> http://redhat.com/~mingo/realtime-preempt/realtime-preempt-2.6.9-rc4-mm1-U8
>

I'm getting these BUGs when I use netconsole with Real-Time Preemption
(but netconsole works):

kjournald starting. Commit interval 5 seconds
BUG: sleeping function called from invalid context kjournald(775) at
kernel/mutex.c:25
in_atomic():0 [00000000], irqs_disabled():1
[<c0105fbe>] dump_stack+0x1e/0x20 (20)
[<c01194d8>] __might_sleep+0xb8/0xd0 (36)
[<c0130bc0>] _mutex_lock+0x20/0x40 (20)
[<c02675f7>] netpoll_send_skb+0x37/0xc0 (28)
[<c0231081>] write_msg+0x41/0x60 (36)
[<c011c208>] __call_console_drivers+0x58/0x60 (32)
[<c011c326>] call_console_drivers+0x96/0x140 (40)
[<c011c6e1>] release_console_sem+0x71/0x100 (36)
[<c011c5b6>] vprintk+0x116/0x180 (36)
[<c011c498>] printk+0x18/0x20 (16)
[<c01a31af>] kjournald+0x8f/0x250 (140)
[<c01032d1>] kernel_thread_helper+0x5/0x14 (141484052)
preempt count: 00000001
. 1-level deep critical section nesting:
.. entry 1: print_traces+0x18/0x50 / (dump_stack+0x1e/0x20)

EXT3 FS on hda8, <3>BUG: sleeping function called from invalid context
mount(786) at kernel/mutex.c:25
in_atomic():0 [00000000], irqs_disabled():1
[<c0105fbe>] dump_stack+0x1e/0x20 (20)
[<c01194d8>] __might_sleep+0xb8/0xd0 (36)
[<c0130bc0>] _mutex_lock+0x20/0x40 (20)
[<c02675f7>] netpoll_send_skb+0x37/0xc0 (28)
[<c0231081>] write_msg+0x41/0x60 (36)
[<c011c208>] __call_console_drivers+0x58/0x60 (32)
[<c011c302>] call_console_drivers+0x72/0x140 (40)
[<c011c6e1>] release_console_sem+0x71/0x100 (36)
[<c011c5b6>] vprintk+0x116/0x180 (36)
[<c011c498>] printk+0x18/0x20 (16)
[<c01989f2>] ext3_setup_super+0xd2/0x1c0 (80)
[<c019a5ed>] ext3_remount+0x12d/0x190 (48)
[<c015d9b0>] do_remount_sb+0xa0/0xf0 (32)
[<c0173c6d>] do_remount+0x6d/0xc0 (36)
[<c01745fb>] do_mount+0x19b/0x1b0 (116)
[<c01749e7>] sys_mount+0x97/0xe0 (48)
[<c010518f>] syscall_call+0x7/0xb (-8124)
preempt count: 00000001
. 1-level deep critical section nesting:
.. entry 1: print_traces+0x18/0x50 / (dump_stack+0x1e/0x20)

internal journal


I have hacked the sk98lin driver to support netpoll (I sent the patch to
netdev), so maybe I did something wrong and these BUGs are my own fault.

Does anybody else use netconsole with Real-Time Preemption?

Michal
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