> Ok I have tried 4.14.14 and got following after 1 hour or so. It was > not fatal, system kept going.
[ 2833.840452] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 [ 2833.840549] IP: xfrm_output_resume+0x20a/0x460 [ 2833.840618] PGD 0 P4D 0 [ 2833.840682] Oops: 0000 [#1] SMP NOPTI [ 2833.840752] CPU: 81 PID: 121868 Comm: spamd child Not tainted 4.14.14-gentoo #2 [ 2833.840831] Hardware name: Supermicro AS -1123US-TR4/H11DSU-iN, BIOS 1.0a 09/25/2017 [ 2833.840911] task: ffff891d1d5b8600 task.stack: ffff980cde96c000 [ 2833.840987] RIP: 0010:xfrm_output_resume+0x20a/0x460 [ 2833.841058] RSP: 0018:ffff980cde96fb70 EFLAGS: 00010246 [ 2833.841129] RAX: 0000000000000000 RBX: ffff891b1e0a48e0 RCX: 0000000000000000 [ 2833.841207] RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000000 [ 2833.841285] RBP: ffffffffb1f11300 R08: ffff980cde96fa20 R09: ffff891b199ba450 [ 2833.841363] R10: ffff891b1d5b30c4 R11: 0000000000000000 R12: ffff891b1e0f7400 [ 2833.841441] R13: ffff891b1e0f743c R14: 0000000000000020 R15: 000000000001f000 [ 2833.841519] FS: 00007fe90028e700(0000) GS:ffff891b1fc40000(0000) knlGS:0000000000000000 [ 2833.841601] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2833.841673] CR2: 0000000000000018 CR3: 0000800dcc944000 CR4: 00000000001406e0 [ 2833.841908] Call Trace: [ 2833.842141] ? skb_checksum_help+0x83/0x1b0 [ 2833.842382] ? xfrm_output+0x1c9/0x210 [ 2833.842626] xfrm6_output+0x91/0x110 [ 2833.842904] ? xfrm6_local_rxpmtu+0x80/0x80 [ 2833.843200] tcp_transmit_skb+0x541/0x990 [ 2833.843488] tcp_write_xmit+0x1bc/0xf90 [ 2833.843743] ? _copy_from_iter_full+0x93/0x230 [ 2833.843955] __tcp_push_pending_frames+0x28/0x90 [ 2833.844115] tcp_sendmsg_locked+0x65c/0xe40 [ 2833.844351] tcp_sendmsg+0x2e/0x50 [ 2833.844565] sock_sendmsg+0x3e/0x50 [ 2833.844784] sock_write_iter+0x82/0xf0 [ 2833.845011] __vfs_write+0x129/0x190 [ 2833.845233] vfs_write+0xc3/0x1c0 [ 2833.845500] SyS_write+0x5f/0xd0 [ 2833.845709] entry_SYSCALL_64_fastpath+0x19/0x72 [ 2833.845932] RIP: 0033:0x7fe8ff9b9b80 [ 2833.846148] RSP: 002b:00007ffd441632c8 EFLAGS: 00000246 [ 2833.846148] Code: b0 fe ff ff 31 f6 85 d2 0f 8f a6 fe ff ff 0f 1f 00 e9 af fe ff ff 85 f6 89 f0 0f 85 cc fe ff ff 48 8b 7b 58 48 89 f8 48 83 e0 fe <4c> 8b 68 18 4d 85 ed 0f 84 ad 01 00 00 41 8b 85 80 00 00 00 85 [ 2833.846987] RIP: xfrm_output_resume+0x20a/0x460 RSP: ffff980cde96fb70 [ 2833.847280] CR2: 0000000000000018 [ 2833.847532] ---[ end trace 504f6c380fc3f734 ]---
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