RHEL7: NULL pointer dereference in xfs_iflush_int+248

Issue

• System crashed with the bug line "BUG: unable to handle kernel NULL pointer dereference at 0000000000000090"

[979563.726006] BUG: unable to handle kernel NULL pointer dereference at 0000000000000090
[979563.734859] IP: [<ffffffffa03fb4d8>] xfs_iflush_int+0xf8/0x310 [xfs]
...
[979564.007097] Call Trace:
[979564.009948]  [<ffffffffa03fbeb9>] xfs_iflush_cluster+0x2d9/0x400 [xfs]
[979564.017336]  [<ffffffffa03ffb2b>] xfs_iflush+0x15b/0x260 [xfs]
[979564.023967]  [<ffffffffa0411a9e>] xfs_inode_item_push+0xee/0x150 [xfs]
[979564.031355]  [<ffffffffa0419360>] ? xfs_trans_ail_cursor_first+0x90/0x90 [xfs]
[979564.039519]  [<ffffffffa0419671>] xfsaild+0x311/0x660 [xfs]
[979564.045841]  [<ffffffffa0419360>] ? xfs_trans_ail_cursor_first+0x90/0x90 [xfs]
[979564.053998]  [<ffffffff810b064f>] kthread+0xcf/0xe0
[979564.059535]  [<ffffffff810b0580>] ? kthread_create_on_node+0x140/0x140
[979564.066916]  [<ffffffff81696618>] ret_from_fork+0x58/0x90
[979564.073034]  [<ffffffff810b0580>] ? kthread_create_on_node+0x140/0x140
[979564.080412] Code: 66 83 bb 26 01 00 00 ff 0f 84 05 01 00 00 31 c9 4c 89 e2 4c 89 ee 48 89 df e8 15 11 fe ff 80 bb 5a 01 00 00 00 0f 85 d0 00 00 00 <41> 8b 84 24 90 00 00 00 41 c7 84 24 94 00 00 00 00 00 00 00 4c 
[979564.102162] RIP  [<ffffffffa03fb4d8>] xfs_iflush_int+0xf8/0x310 [xfs]
[979564.109463]  RSP <ffff881ffef07cc8>
[979564.113448] CR2: 0000000000000090