On 2018-02-14 18:07, Guillaume Nault wrote:
On Wed, Feb 14, 2018 at 03:17:23PM +0200, Denys Fedoryshchenko wrote:

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
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);
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);

I expect a memory corruption. Do you have the possibility to run with
KASAN by any chance?
I will try to enable it tonight. For now i reverted "drivers, net, ppp: convert ppp_file.refcnt from atomic_t to refcount_t" for test.

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