Hi,
linux-next 20150112
[ 934.572323] ata2: exception Emask 0x50 SAct 0x0 SErr 0x4090800 action 0xe frozen
[ 934.572329] ata2: irq_stat 0x00400040, connection status changed
[ 934.572332] ata2: SError: { HostInt PHYRdyChg 10B8B DevExch }
[ 934.572341] BUG: unable to handle kernel NULL pointer dereference at 0000000000000460
[ 934.572346] IP: [<ffffffff812c722c>] ata_eh_report+0x3ad/0x74d
[ 934.572354] PGD 0
[ 934.572357] Oops: 0000 [#1] PREEMPT SMP
[ 934.572360] Modules linked in: ipv6 rndis_host cdc_ether usbnet broadcom mii crc32c_intel tg3 microcode psmouse evdev ac i2c_i801 lpc_ich wmi battery processor ehci_pci ehci_hcd usbcore sd_mod ahci
[ 934.572382] CPU: 3 PID: 81 Comm: scsi_eh_1 Not tainted 3.19.0-rc4-next-20150112-dbg-dirty #441
[ 934.572384] Hardware name: Acer Aspire 5741G /Aspire 5741G , BIOS V1.20 02/08/2011
[ 934.572387] task: ffff880151a1a0c0 ti: ffff88009ad8c000 task.ti: ffff88009ad8c000
[ 934.572388] RIP: 0010:[<ffffffff812c722c>] [<ffffffff812c722c>] ata_eh_report+0x3ad/0x74d
[ 934.572392] RSP: 0018:ffff88009ad8fba8 EFLAGS: 00010246
[ 934.572394] RAX: 0000000000000000 RBX: ffff88009ade4000 RCX: 0000000000000000
[ 934.572396] RDX: 0000000000000000 RSI: ffffffff81580e6d RDI: ffff88009ad8fc0a
[ 934.572398] RBP: ffff88009ad8fc78 R08: 0000000000000001 R09: 0000000000000000
[ 934.572400] R10: 0000000080582700 R11: ffffffff82613e00 R12: ffff88009ade5e98
[ 934.572402] R13: ffffffff81580e6d R14: 0000000000000020 R15: ffff88009ad8fc02
[ 934.572404] FS: 0000000000000000(0000) GS:ffff880157d80000(0000) knlGS:0000000000000000
[ 934.572406] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 934.572408] CR2: 0000000000000460 CR3: 000000000180b000 CR4: 00000000000007e0
[ 934.572409] Stack:
[ 934.572410] ffff88009ad8fc48 ffffffff81580e6d ffffffff81580e6d ffffffff81580e6d
[ 934.572414] ffffffff81580e6d ffffffff81580e6d ffffffff81580e6d ffff88009ade4000
[ 934.572418] 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[ 934.572421] Call Trace:
[ 934.572426] [<ffffffff812c96e5>] ata_do_eh+0x2b/0x93
[ 934.572429] [<ffffffff812c05c0>] ? ata_phys_link_offline+0x29/0x29
[ 934.572434] [<ffffffff812d0bab>] ? ahci_do_softreset+0x192/0x192
[ 934.572437] [<ffffffff812cfb7e>] ? ahci_dev_classify+0x4d/0x4d
[ 934.572440] [<ffffffff812cf943>] ? ahci_pmp_attach+0x11d/0x11d
[ 934.572442] [<ffffffff812cfb7e>] ? ahci_dev_classify+0x4d/0x4d
[ 934.572445] [<ffffffff812c97a3>] ata_std_error_handler+0x56/0x5e
[ 934.572448] [<ffffffff812cfe8f>] ahci_error_handler+0x33/0x54
[ 934.572451] [<ffffffff812c9297>] ata_scsi_port_error_handler+0x21c/0x582
[ 934.572454] [<ffffffff812c968f>] ata_scsi_error+0x92/0xbd
[ 934.572460] [<ffffffff812b1b23>] scsi_error_handler+0x1ae/0x802
[ 934.572465] [<ffffffff810683c2>] ? trace_hardirqs_on_caller+0x180/0x19c
[ 934.572468] [<ffffffff810683eb>] ? trace_hardirqs_on+0xd/0xf
[ 934.572473] [<ffffffff813c0d5d>] ? _raw_spin_unlock_irqrestore+0x46/0x5b
[ 934.572476] [<ffffffff812b1975>] ? scsi_eh_get_sense+0x19e/0x19e
[ 934.572480] [<ffffffff81051a1c>] kthread+0x10e/0x116
[ 934.572484] [<ffffffff8105bee3>] ? arch_vtime_task_switch+0x106/0x113
[ 934.572488] [<ffffffff8105190e>] ? kthread_create_on_node+0x1b6/0x1b6
[ 934.572491] [<ffffffff813c162c>] ret_from_fork+0x7c/0xb0
[ 934.572494] [<ffffffff8105190e>] ? kthread_create_on_node+0x1b6/0x1b6
[ 934.572495] Code: 03 00 00 00 48 8b 93 88 01 00 00 48 c7 85 76 ff ff ff 00 00 00 00 48 8d bd 7e ff ff ff 48 c7 45 8a 00 00 00 00 f3 ab 48 8d 7d 92 <44> 8b aa 60 04 00 00 b1 3e f3 aa f6 83 d2 01 00 00 01 0f 84 55
[ 934.572532] RIP [<ffffffff812c722c>] ata_eh_report+0x3ad/0x74d
[ 934.572535] RSP <ffff88009ad8fba8>
[ 934.572537] CR2: 0000000000000460
[ 934.572540] ---[ end trace 62160753352ee227 ]---
-ss
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