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Date: Thu, 04 Apr 2013 21:23:27 +0200
From: Eric Valette <eric.valette@free.fr>
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To: linux-kernel@vger.kernel.org
Subject: Strange trace in dmesg on kernel 3.8.5
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Hi,

When booting a brand new machine freshly installed I notice in the dmesg 
output always the same worrying trace:

PS copy me I'm not subscribed.


ata2.00: ATA-9: Samsung SSD 840 Series, DXT07B0Q, max UDMA/133
ata2.00: 234441648 sectors, multi 16: LBA48 NCQ (depth 31/32), AA
   ------------[ cut here ]------------
WARNING: at /usr/src/linux-3.8.5/lib/dma-debug.c:947 
check_for_stack+0x92/0xc7()
Hardware name: System Product Name
ahci 0000:00:1f.2: DMA-API: device driver maps memory fromstack 
[addr=ffff88040df2da50]
Modules linked in:
Pid: 1419, comm: scsi_eh_1 Not tainted 3.8.5 #3
Call Trace:
  [<ffffffff8121915c>] ? check_for_stack+0x92/0xc7
  [<ffffffff8102bd25>] warn_slowpath_common+0x7c/0x94
  [<ffffffff8102bd84>] warn_slowpath_fmt+0x47/0x49
  [<ffffffff8121915c>] check_for_stack+0x92/0xc7
  [<ffffffff8121927e>] debug_dma_map_sg+0xed/0x150
  [<ffffffff8133fd72>] ata_qc_issue+0x22c/0x2e1
  [<ffffffff81340061>] ata_exec_internal_sg+0x23a/0x42c
  [<ffffffff813402d1>] ata_exec_internal+0x7e/0x8b
  [<ffffffff813482cb>] ata_read_log_page+0x78/0x7f
  [<ffffffff813414ea>] ata_dev_configure+0xcc1/0x112b
  [<ffffffff81035b0d>] ? del_timer_sync+0x2b/0x49
  [<ffffffff815341c1>] ? schedule_timeout+0x145/0x165
  [<ffffffff8104c913>] ? wake_up_process+0x32/0x32
  [<ffffffff815362ae>] ? _raw_spin_lock_irqsave+0x18/0x39
  [<ffffffff8153642d>] ? _raw_spin_unlock_irqrestore+0x13/0x2e
  [<ffffffff81340228>] ? ata_exec_internal_sg+0x401/0x42c
  [<ffffffff813402d1>] ? ata_exec_internal+0x7e/0x8b
  [<ffffffff8134260a>] ? ata_std_postreset+0x9e/0xc4
  [<ffffffff81340300>] ? ata_do_dev_read_id+0x22/0x24
  [<ffffffff81340499>] ? ata_dev_read_id+0xd4/0x3f3
  [<ffffffff8134ea61>] ? ahci_error_handler+0x3b/0x3b
  [<ffffffff81347a63>] ? ata_ering_map+0x3a/0x5a
  [<ffffffff8134a4f3>] ata_eh_recover+0x6b0/0xee2
  [<ffffffff8134ea61>] ? ahci_error_handler+0x3b/0x3b
  [<ffffffff8134ee52>] ? ahci_dev_classify+0x4d/0x4d
  [<ffffffff8134f9e1>] ? ahci_do_softreset+0x177/0x177
  [<ffffffff813426b0>] ? ata_phys_link_offline+0x27/0x27
  [<ffffffff8134b417>] ata_do_eh+0x46/0x93
  [<ffffffff813426b0>] ? ata_phys_link_offline+0x27/0x27
  [<ffffffff8134f9e1>] ? ahci_do_softreset+0x177/0x177
  [<ffffffff8134ee52>] ? ahci_dev_classify+0x4d/0x4d
  [<ffffffff8134ea61>] ? ahci_error_handler+0x3b/0x3b
  [<ffffffff8134ee52>] ? ahci_dev_classify+0x4d/0x4d
  [<ffffffff8134b4b9>] ata_std_error_handler+0x55/0x5c
  [<ffffffff8134ea49>] ahci_error_handler+0x23/0x3b
  [<ffffffff8134affe>] ata_scsi_port_error_handler+0x236/0x554
  [<ffffffff8134b3a8>] ata_scsi_error+0x8c/0xb5
  [<ffffffff81329f8d>] scsi_error_handler+0xa3/0x40a
  [<ffffffff8104c920>] ? default_wake_function+0xd/0xf
  [<ffffffff81329eea>] ? scsi_eh_get_sense+0xa2/0xa2
  [<ffffffff81042662>] kthread+0xb5/0xbd
  [<ffffffff810425ad>] ? kthread_stop+0x53/0x53
  [<ffffffff815370ac>] ret_from_fork+0x7c/0xb0
  [<ffffffff810425ad>] ? kthread_stop+0x53/0x53
   ---[ end trace b53ccdbc387522c5 ]---

--eric
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