INFO: task stress-ng-hdd blocked for more than 120 seconds.

I'm running 'sudo stress-ng --hdd 8' on a new skylake system and I'm getting several "INFO: task stress-ng-hdd:XXXXX blocked for more than 120 seconds." errors.
After Googling http://www.blackmoreops.com/2014/09/22/linux-kernel-panic-issue-fix-hung_task_timeout_secs-blocked-120-seconds-problem/#Explanation tells me that this can be caused by file system caching not being able to flush data out to the ssd's within two minutes. Which sounds reasonable for a hdd stress test.
But can you confirm that this is indeed the expected behaviour or is the hardware maybe failing under the load?

It's on the following config:

Ubuntu 14.04.3 server
Linux 3.19.0-25
Stress-NG 0.03.15

A /boot partition
Software raid1 with dm-crypt on top for /
Dm-crypt for 2 swap partitions

Intel Core i7 6700K
Gigabyte GA-Z170X-UD3
2 x Samsung SM951 (256GB M.2, PCI-e 3.0 x4 @ 2.150/1.200MB/s)

The dmesg output related to this is this:

[278825.706447] INFO: task stress-ng-hdd:12807 blocked for more than 120 seconds.
[278825.706969] Not tainted 3.19.0-25-generic #26~14.04.1-Ubuntu
[278825.707471] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[278825.707979] stress-ng-hdd D ffff8800819338e8 0 12807 12806 0x00000000
[278825.707981] ffff8800819338e8 ffff88045fc03110 0000000000013e80 ffff880081933fd8
[278825.707982] 0000000000013e80 ffff8804616f13a0 ffff88045fc03110 ffff88045e306068
[278825.707983] ffff88045e306048 ffff88045e30604c ffff88045fc03110 00000000ffffffff
[278825.707985] Call Trace:
[278825.707989] [<ffffffff817b27f9>] schedule_preempt_disabled+0x29/0x70
[278825.707990] [<ffffffff817b44e5>] __mutex_lock_slowpath+0x95/0x100
[278825.707992] [<ffffffff817b4573>] mutex_lock+0x23/0x37
[278825.707994] [<ffffffff812c8032>] fat_alloc_clusters+0x62/0x500
[278825.707996] [<ffffffff8117ee5f>] ? __alloc_pages_nodemask+0x47f/0xa60
[278825.707998] [<ffffffff810a4045>] ? sched_clock_cpu+0x85/0xc0
[278825.708000] [<ffffffff810ac001>] ? put_prev_entity+0x31/0x3f0
[278825.708002] [<ffffffff811cf04a>] ? kmem_cache_alloc+0x1ea/0x220
[278825.708004] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278825.708006] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278825.708007] [<ffffffff812c95f9>] fat_get_block+0x199/0x210
[278825.708008] [<ffffffff81220246>] ? create_empty_buffers+0xa6/0xe0
[278825.708009] [<ffffffff8122139a>] __block_write_begin+0x18a/0x480
[278825.708010] [<ffffffff8118440e>] ? lru_cache_add+0xe/0x10
[278825.708012] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.708013] [<ffffffff81180856>] ? wait_for_stable_page+0x16/0x50
[278825.708014] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.708015] [<ffffffff812216d6>] block_write_begin+0x46/0x90
[278825.708016] [<ffffffff812218d2>] cont_write_begin+0x1b2/0x2c0
[278825.708017] [<ffffffff812cac17>] fat_write_begin+0x47/0x80
[278825.708019] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.708020] [<ffffffff81175bf1>] generic_perform_write+0xb1/0x1a0
[278825.708022] [<ffffffff812073fa>] ? file_update_time+0x8a/0xd0
[278825.708023] [<ffffffff81177d8f>] __generic_file_write_iter+0x15f/0x350
[278825.708024] [<ffffffff810aa4a4>] ? update_curr+0xe4/0x180
[278825.708026] [<ffffffff81177fbd>] generic_file_write_iter+0x3d/0xb0
[278825.708027] [<ffffffff811ebaf1>] new_sync_write+0x81/0xb0
[278825.708029] [<ffffffff811ec297>] vfs_write+0xb7/0x1f0
[278825.708030] [<ffffffff817b1e0b>] ? __schedule+0x37b/0x830
[278825.708031] [<ffffffff811ecea6>] SyS_write+0x46/0xb0
[278825.708033] [<ffffffff817b668d>] system_call_fastpath+0x16/0x1b
[278825.708034] INFO: task stress-ng-hdd:12808 blocked for more than 120 seconds.
[278825.708543] Not tainted 3.19.0-25-generic #26~14.04.1-Ubuntu
[278825.709052] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[278825.709566] stress-ng-hdd D ffff8800819c38e8 0 12808 12806 0x00000000
[278825.709568] ffff8800819c38e8 ffff88045fc009d0 0000000000013e80 ffff8800819c3fd8
[278825.709569] 0000000000013e80 ffff8804616f09d0 ffff88045fc009d0 0000000000010200
[278825.709570] ffff88045e306048 ffff88045e30604c ffff88045fc009d0 00000000ffffffff
[278825.709571] Call Trace:
[278825.709572] [<ffffffff817b27f9>] schedule_preempt_disabled+0x29/0x70
[278825.709573] [<ffffffff817b44e5>] __mutex_lock_slowpath+0x95/0x100
[278825.709574] [<ffffffff817b4573>] mutex_lock+0x23/0x37
[278825.709576] [<ffffffff812c8032>] fat_alloc_clusters+0x62/0x500
[278825.709577] [<ffffffff8117ee5f>] ? __alloc_pages_nodemask+0x47f/0xa60
[278825.709578] [<ffffffff810a4045>] ? sched_clock_cpu+0x85/0xc0
[278825.709579] [<ffffffff810ac001>] ? put_prev_entity+0x31/0x3f0
[278825.709581] [<ffffffff811cf04a>] ? kmem_cache_alloc+0x1ea/0x220
[278825.709582] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278825.709584] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278825.709585] [<ffffffff812c95f9>] fat_get_block+0x199/0x210
[278825.709586] [<ffffffff81220246>] ? create_empty_buffers+0xa6/0xe0
[278825.709587] [<ffffffff8122139a>] __block_write_begin+0x18a/0x480
[278825.709588] [<ffffffff8118440e>] ? lru_cache_add+0xe/0x10
[278825.709589] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.709590] [<ffffffff81180856>] ? wait_for_stable_page+0x16/0x50
[278825.709591] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.709592] [<ffffffff812216d6>] block_write_begin+0x46/0x90
[278825.709593] [<ffffffff812218d2>] cont_write_begin+0x1b2/0x2c0
[278825.709595] [<ffffffff812cac17>] fat_write_begin+0x47/0x80
[278825.709596] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.709597] [<ffffffff81175bf1>] generic_perform_write+0xb1/0x1a0
[278825.709598] [<ffffffff812073fa>] ? file_update_time+0x8a/0xd0
[278825.709600] [<ffffffff81177d8f>] __generic_file_write_iter+0x15f/0x350
[278825.709601] [<ffffffff810aa4a4>] ? update_curr+0xe4/0x180
[278825.709602] [<ffffffff81177fbd>] generic_file_write_iter+0x3d/0xb0
[278825.709603] [<ffffffff811ebaf1>] new_sync_write+0x81/0xb0
[278825.709605] [<ffffffff811ec297>] vfs_write+0xb7/0x1f0
[278825.709606] [<ffffffff817b1e0b>] ? __schedule+0x37b/0x830
[278825.709607] [<ffffffff811ecea6>] SyS_write+0x46/0xb0
[278825.709608] [<ffffffff817b668d>] system_call_fastpath+0x16/0x1b
[278825.709609] INFO: task stress-ng-hdd:12809 blocked for more than 120 seconds.
[278825.710147] Not tainted 3.19.0-25-generic #26~14.04.1-Ubuntu
[278825.710688] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[278825.711207] stress-ng-hdd D ffff8800819df8e8 0 12809 12806 0x00000000
[278825.711209] ffff8800819df8e8 ffff88045fc04e80 0000000000013e80 ffff8800819dffd8
[278825.711210] 0000000000013e80 ffff8804616f09d0 ffff88045fc04e80 ffff88045e306068
[278825.711211] ffff88045e306048 ffff88045e30604c ffff88045fc04e80 00000000ffffffff
[278825.711212] Call Trace:
[278825.711213] [<ffffffff817b27f9>] schedule_preempt_disabled+0x29/0x70
[278825.711214] [<ffffffff817b44e5>] __mutex_lock_slowpath+0x95/0x100
[278825.711215] [<ffffffff817b4573>] mutex_lock+0x23/0x37
[278825.711217] [<ffffffff812c8032>] fat_alloc_clusters+0x62/0x500
[278825.711218] [<ffffffff8117ee5f>] ? __alloc_pages_nodemask+0x47f/0xa60
[278825.711219] [<ffffffff810a4045>] ? sched_clock_cpu+0x85/0xc0
[278825.711220] [<ffffffff810ac001>] ? put_prev_entity+0x31/0x3f0
[278825.711222] [<ffffffff811cf04a>] ? kmem_cache_alloc+0x1ea/0x220
[278825.711223] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278825.711224] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278825.711226] [<ffffffff812c95f9>] fat_get_block+0x199/0x210
[278825.711227] [<ffffffff81220246>] ? create_empty_buffers+0xa6/0xe0
[278825.711228] [<ffffffff8122139a>] __block_write_begin+0x18a/0x480
[278825.711229] [<ffffffff8118440e>] ? lru_cache_add+0xe/0x10
[278825.711230] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.711231] [<ffffffff81180856>] ? wait_for_stable_page+0x16/0x50
[278825.711232] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.711233] [<ffffffff812216d6>] block_write_begin+0x46/0x90
[278825.711234] [<ffffffff812218d2>] cont_write_begin+0x1b2/0x2c0
[278825.711236] [<ffffffff812cac17>] fat_write_begin+0x47/0x80
[278825.711237] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.711238] [<ffffffff81175bf1>] generic_perform_write+0xb1/0x1a0
[278825.711239] [<ffffffff812073fa>] ? file_update_time+0x8a/0xd0
[278825.711240] [<ffffffff81177d8f>] __generic_file_write_iter+0x15f/0x350
[278825.711242] [<ffffffff810aa4a4>] ? update_curr+0xe4/0x180
[278825.711243] [<ffffffff81177fbd>] generic_file_write_iter+0x3d/0xb0
[278825.711244] [<ffffffff811ebaf1>] new_sync_write+0x81/0xb0
[278825.711245] [<ffffffff811ec297>] vfs_write+0xb7/0x1f0
[278825.711246] [<ffffffff817b1e0b>] ? __schedule+0x37b/0x830
[278825.711248] [<ffffffff811ecea6>] SyS_write+0x46/0xb0
[278825.711249] [<ffffffff817b668d>] system_call_fastpath+0x16/0x1b
[278825.711250] INFO: task stress-ng-hdd:12810 blocked for more than 120 seconds.
[278825.711771] Not tainted 3.19.0-25-generic #26~14.04.1-Ubuntu
[278825.712291] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[278825.712819] stress-ng-hdd D ffff88008202b8e8 0 12810 12806 0x00000000
[278825.712820] ffff88008202b8e8 ffff88045fc05850 0000000000013e80 ffff88008202bfd8
[278825.712821] 0000000000013e80 ffff88045fc01d70 ffff88045fc05850 000000000000001f
[278825.712822] ffff88045e306048 ffff88045e30604c ffff88045fc05850 00000000ffffffff
[278825.712823] Call Trace:
[278825.712824] [<ffffffff817b27f9>] schedule_preempt_disabled+0x29/0x70
[278825.712825] [<ffffffff817b44e5>] __mutex_lock_slowpath+0x95/0x100
[278825.712826] [<ffffffff817b4573>] mutex_lock+0x23/0x37
[278825.712827] [<ffffffff812c8032>] fat_alloc_clusters+0x62/0x500
[278825.712829] [<ffffffff8117ee5f>] ? __alloc_pages_nodemask+0x47f/0xa60
[278825.712830] [<ffffffff810a4045>] ? sched_clock_cpu+0x85/0xc0
[278825.712831] [<ffffffff810ac001>] ? put_prev_entity+0x31/0x3f0
[278825.712832] [<ffffffff811cf04a>] ? kmem_cache_alloc+0x1ea/0x220
[278825.712834] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278825.712835] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278825.712836] [<ffffffff812c95f9>] fat_get_block+0x199/0x210
[278825.712837] [<ffffffff81220246>] ? create_empty_buffers+0xa6/0xe0
[278825.712838] [<ffffffff8122139a>] __block_write_begin+0x18a/0x480
[278825.712839] [<ffffffff8118440e>] ? lru_cache_add+0xe/0x10
[278825.712841] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.712842] [<ffffffff81180856>] ? wait_for_stable_page+0x16/0x50
[278825.712843] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.712844] [<ffffffff812216d6>] block_write_begin+0x46/0x90
[278825.712845] [<ffffffff812218d2>] cont_write_begin+0x1b2/0x2c0
[278825.712846] [<ffffffff812cac17>] fat_write_begin+0x47/0x80
[278825.712847] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.712849] [<ffffffff81175bf1>] generic_perform_write+0xb1/0x1a0
[278825.712850] [<ffffffff812073fa>] ? file_update_time+0x8a/0xd0
[278825.712851] [<ffffffff81177d8f>] __generic_file_write_iter+0x15f/0x350
[278825.712852] [<ffffffff810aa4a4>] ? update_curr+0xe4/0x180
[278825.712853] [<ffffffff81177fbd>] generic_file_write_iter+0x3d/0xb0
[278825.712855] [<ffffffff811ebaf1>] new_sync_write+0x81/0xb0
[278825.712856] [<ffffffff811ec297>] vfs_write+0xb7/0x1f0
[278825.712857] [<ffffffff817b1e0b>] ? __schedule+0x37b/0x830
[278825.712858] [<ffffffff811ecea6>] SyS_write+0x46/0xb0
[278825.712859] [<ffffffff817b668d>] system_call_fastpath+0x16/0x1b
[278825.712860] INFO: task stress-ng-hdd:12811 blocked for more than 120 seconds.
[278825.713390] Not tainted 3.19.0-25-generic #26~14.04.1-Ubuntu
[278825.713920] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[278825.714489] stress-ng-hdd D ffff880081b978e8 0 12811 12806 0x00000000
[278825.714490] ffff880081b978e8 ffff88045fc01d70 0000000000013e80 ffff880081b97fd8
[278825.714491] 0000000000013e80 ffff88045fc009d0 ffff88045fc01d70 0000000000010200
[278825.714506] ffff88045e306048 ffff88045e30604c ffff88045fc01d70 00000000ffffffff
[278825.714507] Call Trace:
[278825.714509] [<ffffffff817b27f9>] schedule_preempt_disabled+0x29/0x70
[278825.714514] [<ffffffff817b44e5>] __mutex_lock_slowpath+0x95/0x100
[278825.714518] [<ffffffff817b4573>] mutex_lock+0x23/0x37
[278825.714523] [<ffffffff812c8032>] fat_alloc_clusters+0x62/0x500
[278825.714528] [<ffffffff8117ee5f>] ? __alloc_pages_nodemask+0x47f/0xa60
[278825.714532] [<ffffffff810a4045>] ? sched_clock_cpu+0x85/0xc0
[278825.714537] [<ffffffff810ac001>] ? put_prev_entity+0x31/0x3f0
[278825.714542] [<ffffffff811cf04a>] ? kmem_cache_alloc+0x1ea/0x220
[278825.714547] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278825.714551] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278825.714556] [<ffffffff812c95f9>] fat_get_block+0x199/0x210
[278825.714559] [<ffffffff81220246>] ? create_empty_buffers+0xa6/0xe0
[278825.714560] [<ffffffff8122139a>] __block_write_begin+0x18a/0x480
[278825.714561] [<ffffffff8118440e>] ? lru_cache_add+0xe/0x10
[278825.714562] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.714563] [<ffffffff81180856>] ? wait_for_stable_page+0x16/0x50
[278825.714564] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.714565] [<ffffffff812216d6>] block_write_begin+0x46/0x90
[278825.714566] [<ffffffff812218d2>] cont_write_begin+0x1b2/0x2c0
[278825.714568] [<ffffffff812cac17>] fat_write_begin+0x47/0x80
[278825.714569] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.714570] [<ffffffff81175bf1>] generic_perform_write+0xb1/0x1a0
[278825.714572] [<ffffffff812073fa>] ? file_update_time+0x8a/0xd0
[278825.714573] [<ffffffff81177d8f>] __generic_file_write_iter+0x15f/0x350
[278825.714574] [<ffffffff810aa4a4>] ? update_curr+0xe4/0x180
[278825.714575] [<ffffffff81177fbd>] generic_file_write_iter+0x3d/0xb0
[278825.714577] [<ffffffff811ebaf1>] new_sync_write+0x81/0xb0
[278825.714578] [<ffffffff811ec297>] vfs_write+0xb7/0x1f0
[278825.714579] [<ffffffff817b1e0b>] ? __schedule+0x37b/0x830
[278825.714580] [<ffffffff811ecea6>] SyS_write+0x46/0xb0
[278825.714582] [<ffffffff817b668d>] system_call_fastpath+0x16/0x1b
[278825.714583] INFO: task stress-ng-hdd:12812 blocked for more than 120 seconds.
[278825.715143] Not tainted 3.19.0-25-generic #26~14.04.1-Ubuntu
[278825.715680] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[278825.716224] stress-ng-hdd D ffff88008199b8e8 0 12812 12806 0x00000000
[278825.716225] ffff88008199b8e8 ffff88045fc02740 0000000000013e80 ffff88008199bfd8
[278825.716226] 0000000000013e80 ffff88045fc013a0 ffff88045fc02740 ffff88045e306068
[278825.716227] ffff88045e306048 ffff88045e30604c ffff88045fc02740 00000000ffffffff
[278825.716228] Call Trace:
[278825.716229] [<ffffffff817b27f9>] schedule_preempt_disabled+0x29/0x70
[278825.716230] [<ffffffff817b44e5>] __mutex_lock_slowpath+0x95/0x100
[278825.716231] [<ffffffff817b4573>] mutex_lock+0x23/0x37
[278825.716232] [<ffffffff812c8032>] fat_alloc_clusters+0x62/0x500
[278825.716234] [<ffffffff810ab2ae>] ? dequeue_task_fair+0x44e/0x660
[278825.716235] [<ffffffff811cf04a>] ? kmem_cache_alloc+0x1ea/0x220
[278825.716237] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278825.716238] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278825.716239] [<ffffffff812c95f9>] fat_get_block+0x199/0x210
[278825.716240] [<ffffffff81220246>] ? create_empty_buffers+0xa6/0xe0
[278825.716241] [<ffffffff8122139a>] __block_write_begin+0x18a/0x480
[278825.716242] [<ffffffff8118440e>] ? lru_cache_add+0xe/0x10
[278825.716243] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.716244] [<ffffffff81180856>] ? wait_for_stable_page+0x16/0x50
[278825.716245] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.716246] [<ffffffff812216d6>] block_write_begin+0x46/0x90
[278825.716247] [<ffffffff812218d2>] cont_write_begin+0x1b2/0x2c0
[278825.716249] [<ffffffff812cac17>] fat_write_begin+0x47/0x80
[278825.716250] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.716251] [<ffffffff81175bf1>] generic_perform_write+0xb1/0x1a0
[278825.716252] [<ffffffff812073fa>] ? file_update_time+0x8a/0xd0
[278825.716253] [<ffffffff81177d8f>] __generic_file_write_iter+0x15f/0x350
[278825.716255] [<ffffffff810aa4a4>] ? update_curr+0xe4/0x180
[278825.716256] [<ffffffff81177fbd>] generic_file_write_iter+0x3d/0xb0
[278825.716257] [<ffffffff811ebaf1>] new_sync_write+0x81/0xb0
[278825.716258] [<ffffffff811ec297>] vfs_write+0xb7/0x1f0
[278825.716259] [<ffffffff817b1e0b>] ? __schedule+0x37b/0x830
[278825.716260] [<ffffffff811ecea6>] SyS_write+0x46/0xb0
[278825.716262] [<ffffffff817b668d>] system_call_fastpath+0x16/0x1b
[278825.716263] INFO: task stress-ng-hdd:12814 blocked for more than 120 seconds.
[278825.716808] Not tainted 3.19.0-25-generic #26~14.04.1-Ubuntu
[278825.717356] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[278825.717908] stress-ng-hdd D ffff88045b9838e8 0 12814 12806 0x00000000
[278825.717909] ffff88045b9838e8 ffff88045fc013a0 0000000000013e80 ffff88045b983fd8
[278825.717910] 0000000000013e80 ffff8804616975c0 ffff88045fc013a0 0000000000010200
[278825.717911] ffff88045e306048 ffff88045e30604c ffff88045fc013a0 00000000ffffffff
[278825.717912] Call Trace:
[278825.717913] [<ffffffff817b27f9>] schedule_preempt_disabled+0x29/0x70
[278825.717914] [<ffffffff817b44e5>] __mutex_lock_slowpath+0x95/0x100
[278825.717915] [<ffffffff817b4573>] mutex_lock+0x23/0x37
[278825.717917] [<ffffffff812c8032>] fat_alloc_clusters+0x62/0x500
[278825.717918] [<ffffffff8117ee5f>] ? __alloc_pages_nodemask+0x47f/0xa60
[278825.717919] [<ffffffff811cf04a>] ? kmem_cache_alloc+0x1ea/0x220
[278825.717921] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278825.717922] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278825.717923] [<ffffffff812c95f9>] fat_get_block+0x199/0x210
[278825.717924] [<ffffffff81220246>] ? create_empty_buffers+0xa6/0xe0
[278825.717925] [<ffffffff8122139a>] __block_write_begin+0x18a/0x480
[278825.717926] [<ffffffff8118440e>] ? lru_cache_add+0xe/0x10
[278825.717927] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.717928] [<ffffffff81180856>] ? wait_for_stable_page+0x16/0x50
[278825.717930] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.717930] [<ffffffff812216d6>] block_write_begin+0x46/0x90
[278825.717931] [<ffffffff812218d2>] cont_write_begin+0x1b2/0x2c0
[278825.717933] [<ffffffff812cac17>] fat_write_begin+0x47/0x80
[278825.717934] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278825.717935] [<ffffffff81175bf1>] generic_perform_write+0xb1/0x1a0
[278825.717936] [<ffffffff812073fa>] ? file_update_time+0x8a/0xd0
[278825.717938] [<ffffffff81177d8f>] __generic_file_write_iter+0x15f/0x350
[278825.717939] [<ffffffff810aa4a4>] ? update_curr+0xe4/0x180
[278825.717940] [<ffffffff81177fbd>] generic_file_write_iter+0x3d/0xb0
[278825.717941] [<ffffffff811ebaf1>] new_sync_write+0x81/0xb0
[278825.717942] [<ffffffff811ec297>] vfs_write+0xb7/0x1f0
[278825.717943] [<ffffffff817b1e0b>] ? __schedule+0x37b/0x830
[278825.717945] [<ffffffff811ecea6>] SyS_write+0x46/0xb0
[278825.717946] [<ffffffff817b668d>] system_call_fastpath+0x16/0x1b
[278945.484736] INFO: task stress-ng-hdd:12807 blocked for more than 120 seconds.
[278945.485311] Not tainted 3.19.0-25-generic #26~14.04.1-Ubuntu
[278945.485867] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[278945.486429] stress-ng-hdd D ffff8800819338e8 0 12807 12806 0x00000000
[278945.486431] ffff8800819338e8 ffff88045fc03110 0000000000013e80 ffff880081933fd8
[278945.486433] 0000000000013e80 ffff8804616f13a0 ffff88045fc03110 ffff88045e306068
[278945.486434] ffff88045e306048 ffff88045e30604c ffff88045fc03110 00000000ffffffff
[278945.486435] Call Trace:
[278945.486439] [<ffffffff817b27f9>] schedule_preempt_disabled+0x29/0x70
[278945.486441] [<ffffffff817b44e5>] __mutex_lock_slowpath+0x95/0x100
[278945.486442] [<ffffffff817b4573>] mutex_lock+0x23/0x37
[278945.486444] [<ffffffff812c8032>] fat_alloc_clusters+0x62/0x500
[278945.486447] [<ffffffff8117ee5f>] ? __alloc_pages_nodemask+0x47f/0xa60
[278945.486449] [<ffffffff810a4045>] ? sched_clock_cpu+0x85/0xc0
[278945.486450] [<ffffffff810ac001>] ? put_prev_entity+0x31/0x3f0
[278945.486452] [<ffffffff811cf04a>] ? kmem_cache_alloc+0x1ea/0x220
[278945.486454] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278945.486456] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278945.486457] [<ffffffff812c95f9>] fat_get_block+0x199/0x210
[278945.486458] [<ffffffff81220246>] ? create_empty_buffers+0xa6/0xe0
[278945.486459] [<ffffffff8122139a>] __block_write_begin+0x18a/0x480
[278945.486461] [<ffffffff8118440e>] ? lru_cache_add+0xe/0x10
[278945.486462] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278945.486463] [<ffffffff81180856>] ? wait_for_stable_page+0x16/0x50
[278945.486464] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278945.486465] [<ffffffff812216d6>] block_write_begin+0x46/0x90
[278945.486466] [<ffffffff812218d2>] cont_write_begin+0x1b2/0x2c0
[278945.486468] [<ffffffff812cac17>] fat_write_begin+0x47/0x80
[278945.486469] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278945.486470] [<ffffffff81175bf1>] generic_perform_write+0xb1/0x1a0
[278945.486472] [<ffffffff812073fa>] ? file_update_time+0x8a/0xd0
[278945.486473] [<ffffffff81177d8f>] __generic_file_write_iter+0x15f/0x350
[278945.486474] [<ffffffff810aa4a4>] ? update_curr+0xe4/0x180
[278945.486476] [<ffffffff81177fbd>] generic_file_write_iter+0x3d/0xb0
[278945.486477] [<ffffffff811ebaf1>] new_sync_write+0x81/0xb0
[278945.486479] [<ffffffff811ec297>] vfs_write+0xb7/0x1f0
[278945.486480] [<ffffffff817b1e0b>] ? __schedule+0x37b/0x830
[278945.486481] [<ffffffff811ecea6>] SyS_write+0x46/0xb0
[278945.486483] [<ffffffff817b668d>] system_call_fastpath+0x16/0x1b
[278945.486484] INFO: task stress-ng-hdd:12808 blocked for more than 120 seconds.
[278945.487047] Not tainted 3.19.0-25-generic #26~14.04.1-Ubuntu
[278945.487612] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[278945.488181] stress-ng-hdd D ffff8800819c38e8 0 12808 12806 0x00000000
[278945.488182] ffff8800819c38e8 ffff88045fc009d0 0000000000013e80 ffff8800819c3fd8
[278945.488183] 0000000000013e80 ffff8804616f09d0 ffff88045fc009d0 0000000000010200
[278945.488184] ffff88045e306048 ffff88045e30604c ffff88045fc009d0 00000000ffffffff
[278945.488185] Call Trace:
[278945.488186] [<ffffffff817b27f9>] schedule_preempt_disabled+0x29/0x70
[278945.488188] [<ffffffff817b44e5>] __mutex_lock_slowpath+0x95/0x100
[278945.488189] [<ffffffff817b4573>] mutex_lock+0x23/0x37
[278945.488190] [<ffffffff812c8032>] fat_alloc_clusters+0x62/0x500
[278945.488192] [<ffffffff8117ee5f>] ? __alloc_pages_nodemask+0x47f/0xa60
[278945.488193] [<ffffffff810a4045>] ? sched_clock_cpu+0x85/0xc0
[278945.488194] [<ffffffff810ac001>] ? put_prev_entity+0x31/0x3f0
[278945.488195] [<ffffffff811cf04a>] ? kmem_cache_alloc+0x1ea/0x220
[278945.488197] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278945.488198] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278945.488199] [<ffffffff812c95f9>] fat_get_block+0x199/0x210
[278945.488200] [<ffffffff81220246>] ? create_empty_buffers+0xa6/0xe0
[278945.488201] [<ffffffff8122139a>] __block_write_begin+0x18a/0x480
[278945.488202] [<ffffffff8118440e>] ? lru_cache_add+0xe/0x10
[278945.488203] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278945.488204] [<ffffffff81180856>] ? wait_for_stable_page+0x16/0x50
[278945.488206] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278945.488207] [<ffffffff812216d6>] block_write_begin+0x46/0x90
[278945.488208] [<ffffffff812218d2>] cont_write_begin+0x1b2/0x2c0
[278945.488209] [<ffffffff812cac17>] fat_write_begin+0x47/0x80
[278945.488210] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278945.488211] [<ffffffff81175bf1>] generic_perform_write+0xb1/0x1a0
[278945.488213] [<ffffffff812073fa>] ? file_update_time+0x8a/0xd0
[278945.488214] [<ffffffff81177d8f>] __generic_file_write_iter+0x15f/0x350
[278945.488215] [<ffffffff810aa4a4>] ? update_curr+0xe4/0x180
[278945.488216] [<ffffffff81177fbd>] generic_file_write_iter+0x3d/0xb0
[278945.488217] [<ffffffff811ebaf1>] new_sync_write+0x81/0xb0
[278945.488219] [<ffffffff811ec297>] vfs_write+0xb7/0x1f0
[278945.488220] [<ffffffff817b1e0b>] ? __schedule+0x37b/0x830
[278945.488221] [<ffffffff811ecea6>] SyS_write+0x46/0xb0
[278945.488222] [<ffffffff817b668d>] system_call_fastpath+0x16/0x1b
[278945.488223] INFO: task stress-ng-hdd:12809 blocked for more than 120 seconds.
[278945.488818] Not tainted 3.19.0-25-generic #26~14.04.1-Ubuntu
[278945.489416] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[278945.489995] stress-ng-hdd D ffff8800819df8e8 0 12809 12806 0x00000000
[278945.489996] ffff8800819df8e8 ffff88045fc04e80 0000000000013e80 ffff8800819dffd8
[278945.489997] 0000000000013e80 ffff8804616f09d0 ffff88045fc04e80 ffff88045e306068
[278945.489998] ffff88045e306048 ffff88045e30604c ffff88045fc04e80 00000000ffffffff
[278945.489999] Call Trace:
[278945.490000] [<ffffffff817b27f9>] schedule_preempt_disabled+0x29/0x70
[278945.490001] [<ffffffff817b44e5>] __mutex_lock_slowpath+0x95/0x100
[278945.490002] [<ffffffff817b4573>] mutex_lock+0x23/0x37
[278945.490004] [<ffffffff812c8032>] fat_alloc_clusters+0x62/0x500
[278945.490005] [<ffffffff8117ee5f>] ? __alloc_pages_nodemask+0x47f/0xa60
[278945.490006] [<ffffffff810a4045>] ? sched_clock_cpu+0x85/0xc0
[278945.490007] [<ffffffff810ac001>] ? put_prev_entity+0x31/0x3f0
[278945.490009] [<ffffffff811cf04a>] ? kmem_cache_alloc+0x1ea/0x220
[278945.490010] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278945.490011] [<ffffffff8121f291>] ? alloc_buffer_head+0x21/0x60
[278945.490013] [<ffffffff812c95f9>] fat_get_block+0x199/0x210
[278945.490014] [<ffffffff81220246>] ? create_empty_buffers+0xa6/0xe0
[278945.490015] [<ffffffff8122139a>] __block_write_begin+0x18a/0x480
[278945.490016] [<ffffffff8118440e>] ? lru_cache_add+0xe/0x10
[278945.490017] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278945.490018] [<ffffffff81180856>] ? wait_for_stable_page+0x16/0x50
[278945.490019] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278945.490020] [<ffffffff812216d6>] block_write_begin+0x46/0x90
[278945.490021] [<ffffffff812218d2>] cont_write_begin+0x1b2/0x2c0
[278945.490023] [<ffffffff812cac17>] fat_write_begin+0x47/0x80
[278945.490024] [<ffffffff812c9460>] ? fat_generic_compat_ioctl+0x20/0x20
[278945.490025] [<ffffffff81175bf1>] generic_perform_write+0xb1/0x1a0
[278945.490026] [<ffffffff812073fa>] ? file_update_time+0x8a/0xd0
[278945.490028] [<ffffffff81177d8f>] __generic_file_write_iter+0x15f/0x350
[278945.490029] [<ffffffff810aa4a4>] ? update_curr+0xe4/0x180
[278945.490030] [<ffffffff81177fbd>] generic_file_write_iter+0x3d/0xb0
[278945.490031] [<ffffffff811ebaf1>] new_sync_write+0x81/0xb0
[278945.490032] [<ffffffff811ec297>] vfs_write+0xb7/0x1f0
[278945.490033] [<ffffffff817b1e0b>] ? __schedule+0x37b/0x830
[278945.490035] [<ffffffff811ecea6>] SyS_write+0x46/0xb0
[278945.490036] [<ffffffff817b668d>] system_call_fastpath+0x16/0x1b