System crashed due to long blocked D state in function `vx_bc_biowait`

Issue

• System was not responding with the below messages.

...
[656896.971685] INFO: task python2:27596 blocked for more than 240 seconds.
[656896.972519] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[656896.973167] python2         D ffff9ac09eba2100     0 27596  27505 0x00000080
[656896.973821] Call Trace:
[656896.974435]  [<ffffffff8fd8c3f9>] schedule+0x29/0x70
[656896.975047]  [<ffffffff8fd8a0c1>] schedule_timeout+0x221/0x2d0
[656896.975708]  [<ffffffffc0b46f70>] ? vx_snap_strategy+0x2e0/0x320 [vxfs]
[656896.976321]  [<ffffffffc0900493>] ? vx_bread_bp+0xc3/0x290 [vxfs]
[656896.976907]  [<ffffffff8fd8c7ad>] wait_for_completion+0xfd/0x140
[656896.977481]  [<ffffffff8f6daf20>] ? wake_up_state+0x20/0x20
[656896.978079]  [<ffffffffc0ad9fc9>] vx_bc_biowait+0x19/0x40 [vxfs]
[656896.978666]  [<ffffffffc09009d2>] vx_biowait+0x12/0x30 [vxfs]
[656896.979257]  [<ffffffffc0a5a8e1>] vx_iread+0x271/0x520 [vxfs]
[656896.979836]  [<ffffffffc0a5f0f2>] vx_local_iread+0xe2/0x1a0 [vxfs]
[656896.980412]  [<ffffffffc0a694dc>] vx_iget+0xafc/0x1540 [vxfs]
[656896.980981]  [<ffffffffc09b82c9>] vx_dirlook+0x1b9/0x780 [vxfs]
[656896.981552]  [<ffffffffc0ae6c6b>] vx_int_lookup+0x43b/0x5e0 [vxfs]
[656896.982113]  [<ffffffffc0ae7041>] vx_do_lookup2+0x231/0x280 [vxfs]
[656896.982680]  [<ffffffffc0ae70e7>] vx_do_lookup+0x57/0x110 [vxfs]
[656896.983216]  [<ffffffffc0ae72c5>] vx_lookup+0x125/0x4b0 [vxfs]
[656896.983748]  [<ffffffff8f869f98>] ? d_alloc+0x58/0x70
[656896.984267]  [<ffffffff8f859043>] lookup_real+0x23/0x60
[656896.984798]  [<ffffffff8f859a62>] __lookup_hash+0x42/0x60
[656896.985303]  [<ffffffff8fd83175>] lookup_slow+0x42/0xa7
[656896.985879]  [<ffffffff8f85d64e>] path_lookupat+0x89e/0x8d0
[656896.986386]  [<ffffffff8f858fc7>] ? path_get+0x27/0x30
[656896.986898]  [<ffffffff8f85d6ab>] filename_lookup+0x2b/0xc0
[656896.987382]  [<ffffffff8f8613b7>] user_path_at_empty+0x67/0xc0
[656896.987894]  [<ffffffff8f8541c5>] ? cp_new_stat+0x165/0x1a0
[656896.988391]  [<ffffffff8f861421>] user_path_at+0x11/0x20
[656896.988901]  [<ffffffff8f853e73>] vfs_fstatat+0x63/0xc0
[656896.989405]  [<ffffffff8f854291>] SYSC_newlstat+0x31/0x60
[656896.989927]  [<ffffffff8f73cc72>] ? unroll_tree_refs+0xb2/0x120
[656896.990420]  [<ffffffff8f8546fe>] SyS_newlstat+0xe/0x10
[656896.990927]  [<ffffffff8fd99f92>] system_call_fastpath+0x25/0x2a
...