Fedora rawhide kernels have been carrying a set of DMA debugging patches
from dwmw2 for a while. I just booted up a box which contains two of these..
01:00.0 Ethernet controller: Intel Corporation 82575EB Gigabit Network
Connection (rev 02)
01:00.1 Ethernet controller: Intel Corporation 82575EB Gigabit Network
Connection (rev 02)
And got the following trace in dmesg..
[ 33.553105] ------------[ cut here ]------------
[ 33.553109] WARNING: at lib/dma-debug.c:461 check_unmap+0xd4/0x3dd() (Not
tainted)
[ 33.553112] Hardware name: X8DTN
[ 33.553115] igb 0000:01:00.0: DMA-API: device driver tries to free DMA
memory it has not allocated [device address=0x00000004b6c61130] [size=342 bytes]
[ 33.553119] Modules linked in: sunrpc cpufreq_ondemand acpi_cpufreq
freq_table snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device
snd_pcm_oss igb snd_mixer_oss snd_pcm snd_timer shpchp snd iTCO_wdt soundcore
dca iTCO_vendor_support snd_page_alloc serio_raw pata_jmicron i2c_i801 irda
pcspkr crc_ccitt ata_generic pata_acpi radeon drm i2c_algo_bit i2c_core [last
unloaded: microcode]
[ 33.553159] Pid: 3435, comm: rsyslogd Not tainted
2.6.29-0.218.rc7.git2.fc11.x86_64 #1
[ 33.553162] Call Trace:
[ 33.553164] <IRQ> [<ffffffff8104baa3>] warn_slowpath+0xbc/0xf0
[ 33.553176] [<ffffffff813967f8>] ? _spin_lock_irqsave+0x7d/0x8b
[ 33.553181] [<ffffffff811a6865>] ? get_hash_bucket+0x28/0x34
[ 33.553185] [<ffffffff811a520d>] ? swiotlb_virt_to_bus+0x1f/0x23
[ 33.553190] [<ffffffff811a6f30>] check_unmap+0xd4/0x3dd
[ 33.553196] [<ffffffff8106f5d7>] ? mark_lock+0x28/0x37f
[ 33.553200] [<ffffffff811a7386>] debug_dma_unmap_page+0x50/0x52
[ 33.553211] [<ffffffffa01753d6>] pci_unmap_page+0x4e/0x57 [igb]
[ 33.553219] [<ffffffffa017540e>] igb_unmap_and_free_tx_resource+0x2f/0x58
[igb]
[ 33.553227] [<ffffffffa0175540>] igb_clean_tx_irq+0xbf/0x32b [igb]
[ 33.553231] [<ffffffff8106fbb9>] ? trace_hardirqs_on+0xd/0xf
[ 33.553238] [<ffffffff8101781b>] ? native_sched_clock+0x2d/0x5a
[ 33.553246] [<ffffffffa01757e7>] igb_msix_tx+0x3b/0x66 [igb]
[ 33.553252] [<ffffffff81098723>] handle_IRQ_event+0x27/0x63
[ 33.553256] [<ffffffff8109a051>] handle_edge_irq+0xe0/0x129
[ 33.553261] [<ffffffff81013c04>] do_IRQ+0xd9/0x151
[ 33.553265] [<ffffffff81011e93>] ret_from_intr+0x0/0x2e
[ 33.553267] <EOI> <4>---[ end trace 642821cb9679d140 ]---
[ 33.560735] dhclient[3855]: segfault at 49b82b94 ip 00000000004279a0 sp
00007fffac150b80 error 4 in dhclient[400000+7f000]
Is this a useful trace ?
>From a quick eyeball of the code, I'm not entirely sure what goes on here,
so figured I'd share it before I dive deeper.
Dave
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