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SubjectRe: [patch] revert: [NET]: Fix races in net_rx_action vs netpoll

* Olaf Kirch <olaf.kirch@oracle.com> wrote:

> On Tuesday 17 July 2007 20:56, Ingo Molnar wrote:
> > i logged these not via netconsole but via logging on over the console
> > and using dmesg, so it should include everything. in the 100hz case the
> > following seems to show the anomaly:
> >
> > NETDEV WATCHDOG: eth0: transmit timed out
>
> So, it seems as if for some reason, dev->poll isn't called frequently
> enough.
>
> Here's a debugging patch that tries to locate the problem - can you
> give it a try, please?

it triggers here:

netconsole: device eth0 not up yet, forcing it
netconsole: timeout waiting for carrier
console [netcon0] enabled
WARNING: at kernel/softirq.c:138 local_bh_enable()
[<c0105e4a>] show_trace_log_lvl+0x19/0x2e
[<c0105f43>] show_trace+0x12/0x14
[<c0105f59>] dump_stack+0x14/0x16
[<c0130f8d>] local_bh_enable+0x95/0x15d
[<c03cf35b>] netpoll_poll+0xaf/0x361
[<c03cf248>] netpoll_send_skb+0xe8/0x14c
[<c03cf8d4>] netpoll_send_udp+0x258/0x260
[<c02f4016>] write_msg+0x53/0x8d
[<c012c87e>] __call_console_drivers+0x4e/0x5a
[<c012c8e7>] _call_console_drivers+0x5d/0x61
[<c012cf06>] release_console_sem+0x120/0x1c1
[<c012d70a>] register_console+0x22e/0x236
[<c02f3f98>] init_netconsole+0x55/0x67
[<c05e28e5>] kernel_init+0x154/0x2d9
[<c0105c5f>] kernel_thread_helper+0x7/0x10

I've uploaded the full log to:

http://redhat.com/~mingo/misc/100hz.2.log

something i noticed: netconsole output seems to trickle through though,
but very, very slowly (a packet once every 4 seconds or so). TCP/IP is
not functional.

also, i'm using netconsole via the command line (both the network driver
and netconsole is built into the bzImage), maybe that makes a
difference?

(if there's any other data you'd like to see, let me know.)

Ingo
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