Re: Latest net-next from GIT panic
From: Eric Dumazet <hidden>
Date: 2017-09-20 13:37:40
Possibly related (same subject, not in this thread)
- 2017-09-21 · Re: Latest net-next from GIT panic · Eric Dumazet <hidden>
- 2017-09-21 · Re: Latest net-next from GIT panic · Paweł Staszewski <hidden>
- 2017-09-21 · Re: Latest net-next from GIT panic · Paweł Staszewski <hidden>
- 2017-09-21 · Re: Latest net-next from GIT panic · Paweł Staszewski <hidden>
- 2017-09-21 · Re: Latest net-next from GIT panic · Paweł Staszewski <hidden>
On Wed, 2017-09-20 at 06:34 -0700, Eric Dumazet wrote:
quoted hunk ↗ jump to hunk
Could you try this debug patch ?diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index f535779d9dc1dfe36934c2abba4e43d053ac5d6f..1eaa3553a724dc8c048f67b556337072d5addc82 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h@@ -3331,7 +3331,14 @@ void netdev_run_todo(void); */ static inline void dev_put(struct net_device *dev) { - this_cpu_dec(*dev->pcpu_refcnt); + int __percpu *pref = READ_ONCE(dev->pcpu_refcnt); + + if (!pref) { + pr_err("no pcpu_refcnt on dev %p(%s) state %d dismantle %d\n", + dev, dev->name, dev->reg_state, dev->dismantle); + BUG(); + } + this_cpu_dec(*pref); } /**
And since the console will be filled by stack trace, maybe instead of BUG() use some infinite loop ? for (;;) cpu_relax();