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SubjectNULL pointer dereferences with 4.14.27
I've put 4.14.27 this morning in this machine and in about 2h it started
showing null dereferences identical to the following one. There were several of
them, with about 1/2h of interval. Strangely it continued to work and I saw no
other anomalies. I've just reverted to 4.14.26.

It only happened in this machine, which has a net traffic of several Gb/s and
thousands of simultaneous connections.

Mar 17 13:29:21 sagres kernel: : BUG: unable to handle kernel NULL pointer dereference at 0000000000000038
Mar 17 13:29:21 sagres kernel: : IP: tcp_push+0x4e/0xe7
Mar 17 13:29:21 sagres kernel: : PGD 0 P4D 0
Mar 17 13:29:21 sagres kernel: : Oops: 0002 [#1] SMP PTI
Mar 17 13:29:21 sagres kernel: : CPU: 55 PID: 2658 Comm: apache2 Not tainted 4.14.27 #4
Mar 17 13:29:21 sagres kernel: : task: ffff89791cf7e600 task.stack: ffffabdd91db8000
Mar 17 13:29:21 sagres kernel: : RIP: 0010:tcp_push+0x4e/0xe7
Mar 17 13:29:21 sagres kernel: : RSP: 0018:ffffabdd91dbbc10 EFLAGS: 00010246
Mar 17 13:29:21 sagres kernel: : RAX: 0000000000000000 RBX: 00000000000004c4 RCX: 0000000000000001
Mar 17 13:29:21 sagres kernel: : RDX: 0000000000000001 RSI: 0000000000000040 RDI: ffff89968330a100
Mar 17 13:29:21 sagres kernel: : RBP: ffff89968330a250 R08: 0000000000007be8 R09: ffffe77cbfc4ab00
Mar 17 13:29:21 sagres kernel: : R10: ffff89968330a250 R11: 0000000000000000 R12: ffff8987aab3bb80
Mar 17 13:29:21 sagres kernel: : R13: ffff89968330a100 R14: ffff89791cf7e930 R15: 00000000ffffffe0
Mar 17 13:29:21 sagres kernel: : FS: 00007f0bd67d4700(0000) GS:ffff89993f4c0000(0000) knlGS:0000000000000000
Mar 17 13:29:21 sagres kernel: : CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Mar 17 13:29:21 sagres kernel: : CR2: 0000000000000038 CR3: 0000003ff4842006 CR4: 00000000003606e0
Mar 17 13:29:21 sagres kernel: : DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Mar 17 13:29:21 sagres kernel: : DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Mar 17 13:29:21 sagres kernel: : Call Trace:
Mar 17 13:29:21 sagres kernel: : tcp_sendmsg_locked+0xac6/0xc1e
Mar 17 13:29:21 sagres kernel: : tcp_sendmsg+0x23/0x35
Mar 17 13:29:21 sagres kernel: : sock_sendmsg+0x11/0x1b
Mar 17 13:29:21 sagres kernel: : sock_write_iter+0x71/0x87
Mar 17 13:29:21 sagres kernel: : do_iter_readv_writev+0xf0/0x111
Mar 17 13:29:21 sagres kernel: : do_iter_write+0x84/0xf0
Mar 17 13:29:21 sagres kernel: : vfs_writev+0xad/0xfb
Mar 17 13:29:21 sagres kernel: : ? do_writev+0x56/0x92
Mar 17 13:29:21 sagres kernel: : do_writev+0x56/0x92
Mar 17 13:29:21 sagres kernel: : do_syscall_64+0x181/0x210
Mar 17 13:29:21 sagres kernel: : entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Mar 17 13:29:21 sagres kernel: : RIP: 0033:0x7f13f1264017
Mar 17 13:29:21 sagres kernel: : RSP: 002b:00007f0bd67d2810 EFLAGS: 00000293 ORIG_RAX: 0000000000000014
Mar 17 13:29:21 sagres kernel: : RAX: ffffffffffffffda RBX: 0000000000000079 RCX: 00007f13f1264017
Mar 17 13:29:21 sagres kernel: : RDX: 000000000000000a RSI: 00007f0bd67d2970 RDI: 0000000000000079
Mar 17 13:29:21 sagres kernel: : RBP: 00007f0bd67d2970 R08: 0000000000000000 R09: 00007f13680762c8
Mar 17 13:29:21 sagres kernel: : R10: 0000556029c85dd4 R11: 0000000000000293 R12: 000000000000000a
Mar 17 13:29:21 sagres kernel: : R13: 00007f0bd67d2970 R14: 00007f0bd67d28d0 R15: 0000556029ea1440
Mar 17 13:29:21 sagres kernel: : Code: d0 75 02 31 c0 41 89 f3 41 81 e3 00 80 00 00 74 1a 44 8b 8f 58 05 00 00 41 d1 e9 44 2b 8f 5c 06 00 00 44 03 8f 64 06 00 00 79 10 <80> 48 38 08 8b 8f 5c 06 00 00 89 8f 64 06 00 00 40 80 e6 01 74
Mar 17 13:29:21 sagres kernel: : RIP: tcp_push+0x4e/0xe7 RSP: ffffabdd91dbbc10
Mar 17 13:29:21 sagres kernel: : CR2: 0000000000000038
Mar 17 13:29:21 sagres kernel: : ---[ end trace f9a8f71d250d2782 ]---

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