We saw this soon after bootup. Doesn't seem to be reproducible. Our
proprietary driver
was loaded, and it deals with network pkts so this could be all our fault.
I'm posting just in case someone else has seen similar.
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffffa030c2b4>] e1000_put_txbuf+0xc/0x73 [e1000e]
PGD 772d4067 PUD 64478067 PMD 0
Oops: 0000 [#1] PREEMPT SMP
last sysfs file:
/sys/devices/pci0000:00/0000:00:02.0/0000:01:00.0/0000:02:02.0/0000:04:00.1/nets
CPU 2
Modules linked in: macvlan wanlink(P) ip6table_filter ip6_tables pktgen fuse
ebtable_nat iscsi_t]
Pid: 2681, comm: kworker/2:2 Tainted: P W 2.6.38.6+ #2 Supermicro
X7DBU/X7DBU
RIP: 0010:[<ffffffffa030c2b4>] [<ffffffffa030c2b4>] e1000_put_txbuf+0xc/0x73
[e1000e]
RSP: 0018:ffff88007735dd00 EFLAGS: 00010286
e1000e 0000:0e:00.0: irq 82 for MSI/MSI-X
RAX: 0000000000080380 RBX: 0000000000000000 RCX: 0000000000000100
RDX: ffffc90004280000 RSI: 0000000000000000 RDI: ffff880079ba0780
RBP: ffff88007735dd10 R08: ffffffff8105018a R09: 0000000000000000
R10: ffff88007735dc40 R11: 0000000000000286 R12: ffff880079ba0780
R13: 0000000000000001 R14: ffff880079ba0000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88007fc80000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 000000007906d000 CR4: 00000000000006e0
e1000e 0000:0e:00.0: eth10: MSI interrupt test failed, using legacy interrupt.
ADDRCONF(NETDEV_UP): eth10: link is not ready
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process kworker/2:2 (pid: 2681, threadinfo ffff88007735c000, task
ffff880078e72490)
Stack:
ffff880079ba08d8 ffff880037b02d80 ffff88007735dd40 ffffffffa030c8d6
ffff88007735dd40 ffff880079ba0780 ffff880079ba0000 ffff880079ba08d8
ffff88007735dd70 ffffffffa030ca67 ffffffffa031313b ffff880079ba0780
Call Trace:
[<ffffffffa030c8d6>] e1000_clean_tx_ring+0x32/0x88 [e1000e]
[<ffffffffa030ca67>] e1000e_down+0x13b/0x14c [e1000e]
[<ffffffffa030e30a>] e1000e_reinit_locked+0x45/0x5a [e1000e]
[<ffffffffa030e9b8>] e1000_reset_task+0x699/0x6a8 [e1000e]
[<ffffffff81058b90>] ? schedule_work+0x13/0x15
[<ffffffff8103fde4>] ? get_parent_ip+0x11/0x42
[<ffffffffa030e31f>] ? e1000_reset_task+0x0/0x6a8 [e1000e]
[<ffffffff81057175>] process_one_work+0x1ac/0x28a
[<ffffffff8105914f>] worker_thread+0x136/0x255
[<ffffffff81059019>] ? worker_thread+0x0/0x255
[<ffffffff8105c36b>] kthread+0x7d/0x85
[<ffffffff8100b8e4>] kernel_thread_helper+0x4/0x10
[<ffffffff8105c2ee>] ? kthread+0x0/0x85
e1000e 0000:0c:00.1: irq 79 for MSI/MSI-X
[<ffffffff8100b8e0>] ? kernel_thread_helper+0x0/0x10
Code: 00 00 00 8b 45 b8 48 01 82 c0 00 00 00 48 83 c4 78 44 88 e8 5b 41 5c 41
5d 41 5e 41 5f c9
e1000e 0000:0c:00.1: irq 79 for MSI/MSI-X
ADDRCONF(NETDEV_UP): eth7: link is not ready
(gdb) l *(e1000_put_txbuf+0xc)
0x102d8 is in e1000_put_txbuf
(/home/greearb/git/linux-2.6.dev.38.y/drivers/net/e1000e/netdev.c:911).
906 }
907
908 static void e1000_put_txbuf(struct e1000_adapter *adapter,
909 struct e1000_buffer *buffer_info)
910 {
911 if (buffer_info->dma) {
912 if (buffer_info->mapped_as_page)
913 dma_unmap_page(&adapter->pdev->dev,
buffer_info->dma,
914 buffer_info->length,
DMA_TO_DEVICE);
915 else
(gdb) l *(e1000_clean_tx_ring+0x32)
0x108fa is in e1000_clean_tx_ring
(/home/greearb/git/linux-2.6.dev.38.y/drivers/net/e1000e/netdev.c:2158).
2153 struct e1000_ring *tx_ring = adapter->tx_ring;
2154 struct e1000_buffer *buffer_info;
2155 unsigned long size;
2156 unsigned int i;
2157
2158 for (i = 0; i < tx_ring->count; i++) {
2159 buffer_info = &tx_ring->buffer_info[i];
2160 e1000_put_txbuf(adapter, buffer_info);
2161 }
2162
(gdb)
Thanks,
Ben
--
Ben Greear <[email protected]>
Candela Technologies Inc http://www.candelatech.com
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