netdev - Re: Weird traces 4.20.0-rc3+ / RIP: 0010:fib6_walk

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Date:   Mon, 3 Dec 2018 09:59:08 -0700
From:   David Ahern <dsahern@...il.com>
To:     Paweł Staszewski <pstaszewski@...are.pl>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: Weird traces 4.20.0-rc3+ / RIP: 0010:fib6_walk_continue+0x37/0xe6

On 11/30/18 8:00 AM, Paweł Staszewski wrote:
> 
> Traces attached below:
> 
> 
> 
> [310658.536190] rcu: INFO: rcu_sched self-detected stall on CPU
> [310658.536195] rcu:    15-....: (322 ticks this GP)
> idle=fca/1/0x4000000000000002 softirq=50617185/50617185 fqs=64
> [310658.536195] rcu:     (t=15049 jiffies g=84272013 q=4728)
> [310658.536200] NMI backtrace for cpu 15
> [310658.536203] CPU: 15 PID: 87 Comm: ksoftirqd/15 Tainted: G       
> W         4.20.0-rc3+ #1
...
> [310658.536258] RIP: 0010:fib6_walk_continue+0x37/0xe6
...
> [310658.536268]  ? call_fib6_entry_notifiers+0x59/0x59
> [310658.536272]  fib6_walk+0x59/0x76
> [310658.536274]  fib6_clean_tree+0x52/0x6c
> [310658.536276]  ? fib6_del+0x1da/0x1da
> [310658.536278]  ? call_fib6_entry_notifiers+0x59/0x59
> [310658.536280]  __fib6_clean_all+0x55/0x71
> [310658.536282]  fib6_run_gc+0x85/0xe6
> [310658.536285]  ip6_dst_gc+0x74/0xbf
> [310658.536288]  dst_alloc+0x70/0x84
> [310658.536290]  ip6_dst_alloc+0x1c/0x59
> [310658.536293]  icmp6_dst_alloc+0x39/0xd9
> [310658.536295]  ndisc_send_skb+0x8e/0x274
> [310658.536298]  ? __kmalloc_reserve.isra.43+0x28/0x6a
> [310658.536300]  ndisc_send_ns+0x135/0x15e
> [310658.536302]  ? ndisc_solicit+0xdd/0x106
> [310658.536304]  ndisc_solicit+0xdd/0x106
> [310658.536306]  ? lock_timer_base+0x3d/0x61
> [310658.536308]  ? neigh_table_init+0x1f9/0x1f9
> [310658.536310]  ? neigh_probe+0x44/0x55
> [310658.536312]  neigh_probe+0x44/0x55

...

> [310736.112338] Sending NMI from CPU 12 to CPUs 0:
> [310736.112438] NMI backtrace for cpu 0
> [310736.112439] CPU: 0 PID: 10 Comm: ksoftirqd/0 Tainted: G W        
> 4.20.0-rc3+ #1
> [310736.112439] RIP: 0010:fib6_age+0x4/0x29
...
> [310736.112447] Call Trace:
> [310736.112447]  fib6_clean_node+0x72/0xcf
> [310736.112448]  fib6_walk_continue+0x89/0xe6
> [310736.112448]  fib6_walk+0x59/0x76
> [310736.112449]  fib6_clean_tree+0x52/0x6c
> [310736.112449]  ? fib6_del+0x1da/0x1da
> [310736.112450]  ? call_fib6_entry_notifiers+0x59/0x59
> [310736.112450]  __fib6_clean_all+0x55/0x71
> [310736.112450]  fib6_run_gc+0x85/0xe6
> [310736.112451]  ip6_dst_gc+0x74/0xbf
> [310736.112451]  dst_alloc+0x70/0x84
> [310736.112452]  ip6_dst_alloc+0x1c/0x59
> [310736.112452]  ip6_pol_route+0x1b0/0x23b
> [310736.112453]  fib6_rule_lookup+0x19/0x4e
> [310736.112453]  ip6_dst_lookup_tail+0x100/0x18c
> [310736.112453]  ip6_dst_lookup_flow+0x40/0x7f
> [310736.112454]  inet6_sk_rebuild_header+0xd3/0x172
> [310736.112454]  ? tcp_write_timer_handler+0x1c5/0x1c5
> [310736.112455]  ? __tcp_retransmit_skb+0x94/0x4cd
> [310736.112455]  __tcp_retransmit_skb+0x94/0x4cd
> [310736.112456]  ? tcp_write_timer_handler+0x1c5/0x1c5
> [310736.112456]  tcp_retransmit_skb+0xd/0x60
> [310736.112457]  tcp_retransmit_timer+0x358/0x57c
> [310736.112457]  tcp_write_timer_handler+0x6f/0x1c5
> [310736.112458]  tcp_write_timer+0x29/0x55

gc kicked in on different cpus. fib6_gc_lock should prevent the second
one from proceeding.