Hi,

Upgraded kernel to 4.15.3, still it crashes after while (several hours, cannot do bisect, as it is production server).


dev ppp # gdb ppp_generic.o
GNU gdb (Gentoo 7.12.1 vanilla) 7.12.1
<<skipped>>
Reading symbols from ppp_generic.o...done.
(gdb) list *ppp_push+0x73
0x681 is in ppp_push (drivers/net/ppp/ppp_generic.c:1663).
1658                    list = list->next;
1659                    pch = list_entry(list, struct channel, clist);
1660
1661                    spin_lock(&pch->downl);
1662                    if (pch->chan) {
1663                            if (pch->chan->ops->start_xmit(pch->chan, skb))
1664                                    ppp->xmit_pending = NULL;
1665                    } else {
1666                            /* channel got unregistered */
1667                            kfree_skb(skb);



Feb 14 08:32:00 <srv> [17937.863304] general protection fault: 0000 [#1] SMP Feb 14 08:32:00 <srv> [17937.863638] Modules linked in: pppoe pppox ppp_generic slhc netconsole configfs coretemp nf_nat_pptp nf_nat_proto_gre nf_conntrack_pptp nf_conntrack_proto_gre tun xt_TEE nf_dup_ipv4 x t_REDIRECT nf_nat_redirect xt_nat xt_TCPMSS ipt_REJECT nf_reject_ipv4 xt_set xt_string xt_connmark xt_DSCP xt_mark xt_tcpudp ip_set_hash_net ip_set_hash_ip ip_set nfnetlink iptable_mangle iptable_filter iptable_na t nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack ip_tables x_tables 8021q garp mrp stp llc ixgbe dca Feb 14 08:32:00 <srv> [17937.865619] CPU: 6 PID: 12543 Comm: accel-pppd Not tainted 4.15.3-build-0134 #4 Feb 14 08:32:00 <srv> [17937.866211] Hardware name: HP ProLiant DL320e Gen8 v2, BIOS P80 04/02/2015 Feb 14 08:32:00 <srv> [17937.866542] RIP: 0010:ppp_push+0x73/0x4ec [ppp_generic] Feb 14 08:32:00 <srv> [17937.866865] RSP: 0018:ffffc90001fa7d50 EFLAGS: 00010282 Feb 14 08:32:00 <srv> [17937.867191] RAX: 0fd54d16ec030000 RBX: ffff8803eeb207b8 RCX: 0000000000000101 Feb 14 08:32:00 <srv> [17937.867517] RDX: 0000000000000000 RSI: ffff8803f9fb5000 RDI: ffff8803eed1e443 Feb 14 08:32:00 <srv> [17937.867844] RBP: ffff8803f9fb5000 R08: 0000000000000001 R09: 00000000ffffffff Feb 14 08:32:00 <srv> [17937.868171] R10: 00007f0a75fba758 R11: 0000000000000293 R12: 0000000000008021 Feb 14 08:32:00 <srv> [17937.868499] R13: ffff8804144c7880 R14: 0000000000008021 R15: ffff8804144c7800 Feb 14 08:32:00 <srv> [17937.868824] FS: 00007f0a7ecd8700(0000) GS:ffff880434180000(0000) knlGS:0000000000000000 Feb 14 08:32:00 <srv> [17937.869408] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Feb 14 08:32:00 <srv> [17937.869729] CR2: 00007fa87a187978 CR3: 000000042a6cd005 CR4: 00000000001606e0
Feb 14 08:32:00 <srv> [17937.870053] Call Trace:
Feb 14 08:32:00 <srv> [17937.870375] ? __kmalloc_node_track_caller+0xb5/0xd6 Feb 14 08:32:00 <srv> [17937.870700] __ppp_xmit_process+0x35/0x4c6 [ppp_generic] Feb 14 08:32:00 <srv> [17937.871025] ppp_xmit_process+0x35/0x88 [ppp_generic]
Feb 14 08:32:00 <srv> [17937.871350]  ppp_write+0xb1/0xbb [ppp_generic]
Feb 14 08:32:00 <srv> [17937.871678]  __vfs_write+0x1c/0x118
Feb 14 08:32:00 <srv> [17937.872003]  ? SyS_epoll_ctl+0x399/0x871
Feb 14 08:32:00 <srv> [17937.872328]  vfs_write+0xc6/0x169
Feb 14 08:32:00 <srv> [17937.872654]  SyS_write+0x48/0x81
Feb 14 08:32:00 <srv> [17937.872980]  do_syscall_64+0x5f/0xea
Feb 14 08:32:00 <srv> [17937.873310] entry_SYSCALL_64_after_hwframe+0x21/0x86
Feb 14 08:32:00 <srv> [17937.873638] RIP: 0033:0x7f0a7e4bfb2d
Feb 14 08:32:00 <srv> [17937.873963] RSP: 002b:00007f0a7ecd7b00 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 Feb 14 08:32:00 <srv> [17937.874554] RAX: ffffffffffffffda RBX: 00007f0a7d00b1e3 RCX: 00007f0a7e4bfb2d Feb 14 08:32:00 <srv> [17937.874881] RDX: 000000000000000c RSI: 00007f0a74175c80 RDI: 0000000000003ef8 Feb 14 08:32:00 <srv> [17937.875207] RBP: 00007f0a7ecd7b30 R08: 0000000000000000 R09: 000055776e7a5e40 Feb 14 08:32:00 <srv> [17937.875536] R10: 00007f0a75fba758 R11: 0000000000000293 R12: 00007f0a7550dd18 Feb 14 08:32:00 <srv> [17937.875863] R13: 00007ffd4c941eaf R14: 0000000000000000 R15: 00007f0a7ecd8700 Feb 14 08:32:00 <srv> [17937.876190] Code: 94 00 00 00 49 89 ff 0f ba e0 0a 72 43 48 8b 5f 68 48 8d 7b e8 e8 88 4f 84 e1 48 8b 7b b8 48 85 ff 74 10 48 8b 47 08 48 8b 34 24 <ff> 10 85 c0 75 0b eb 14 48 8b 3c 2
4 e8 d8 6c 76 e1 49 c7 87 c8
Feb 14 08:32:00 <srv> [17937.877071] RIP: ppp_push+0x73/0x4ec [ppp_generic] RSP: ffffc90001fa7d50 Feb 14 08:32:00 <srv> [17937.877435] ---[ end trace 30a3cc6a49109783 ]--- Feb 14 08:32:00 <srv> [17937.878370] Kernel panic - not syncing: Fatal exception in interrupt
Feb 14 08:32:00 <srv> [17937.878715] Kernel Offset: disabled
Feb 14 08:32:00 <srv> [17937.879771] Rebooting in 5 seconds..

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