Hi,
on Saturday our network switch lost power due to scheduled
Power outage, and unfortunately one of systems connected to the switch
(mine :-( ) did not survive it. When I came to the system's console today,
I found (written by hand, made a bit shorter...) on screen:
e100: eth0 NIC Link is Up 100Mbps Full Duplex
kernel/sched.c:1802: spin_is_locked on uninitialized spinlock d6e74e18
Unable to handle NULL kernel pointer dereference at virtual address 00000000
...
EIP: C0120AF1 <__wake_up_common + 0x17/0x57>
...
EAX: D6E74E30 EBX: D6E74E18 ECX: 00000001 EDX: 00000000
ESI: 00000001 EDI: 00000001 EBP: C9F3DEDC ESP: C9F3DEC0
...
Call Trace:
__wake_up + 0x7B/0x139
sock_def_write_space + 0x8C/0x94
sock_wfree + 0x4B/0x4D
__kfree_skb + 0x5C/0xD9
net_tx_action + 0x3E/0x210
do_softirq + 0x92/0x94
do_IRQ + 0x207/0x360
common_interrupt + 0x18/0x20
It looks to me like that we've got skb on completion_queue which was connected
to a bit unhappy socket - one which had sk->sk_sleep uninitialized. Only
problem
is that only af_unix sets skb->destructor to sock_wfree, so I somehow miss how
this could be triggered by e100 link change.
Kernel is approx 2.6.2-bk2, UP, APIC, IOAPIC, no-preempt, all DEBUG options
except
CONFIG_FRAME_POINTER enabled.
System is 1.6GHz P4/512MB RAM.
Best regards,
Petr Vandrovec
vandrove@xxxxxxxxxx
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