Re: 4.6.3, pppoe + shaper workload, skb_panic / skb_push / ppp_start_xmit

On Thu, Jul 28, 2016 at 02:28:23PM +0300, Denys Fedoryshchenko wrote:

<server19> [ 5449.904989] CPU: 1 PID: 6359 Comm: ip Not tainted
4.7.0-build-0109 #2
<server19> [ 5449.905255] Hardware name: Supermicro
X10SLM+-LN4F/X10SLM+-LN4F, BIOS 3.0 04/24/2015
<server19> [ 5449.905712] task: ffff8803eef40000 ti: ffff8803fd754000
task.ti: ffff8803fd754000
<server19> [ 5449.906168] RIP: 0010:[<ffffffff818a994d>]
<server19> [<ffffffff818a994d>] inet_fill_ifaddr+0x5a/0x264
<server19> [ 5449.906710] RSP: 0018:ffff8803fd757b98  EFLAGS: 00010286
<server19> [ 5449.906976] RAX: ffff8803ef65cb90 RBX: ffff8803f7d2cd00 RCX:
0000000000000000
<server19> [ 5449.907248] RDX: 0000000800000002 RSI: ffff8803ef65cb90 RDI:
ffff8803ef65cba8
<server19> [ 5449.907519] RBP: ffff8803fd757be0 R08: 0000000000000008 R09:
0000000000000002
<server19> [ 5449.907792] R10: ffa005040269f480 R11: ffffffff820a1c00 R12:
ffa005040269f480
<server19> [ 5449.908067] R13: ffff8803ef65cb90 R14: 0000000000000000 R15:
ffff8803f7d2cd00
<server19> [ 5449.908339] FS:  00007f660674d700(0000)
GS:ffff88041fc40000(0000) knlGS:0000000000000000
<server19> [ 5449.908796] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<server19> [ 5449.909067] CR2: 00000000008b9018 CR3: 00000003f2a11000 CR4:
00000000001406e0
<server19> [ 5449.909339] Stack:
<server19> [ 5449.909598]  0163a8c0869711ac
<server19> 0000008000000000
<server19> ffffffffffffffff
<server19> 0003e1d50003e1d5
<server19>
<server19> [ 5449.910329]  ffff8800d54c0ac8
<server19> ffff8803f0d90000
<server19> 0000000000000005
<server19> 0000000000000000
<server19>
<server19> [ 5449.911066]  ffff8803f7d2cd00
<server19> ffff8803fd757c40
<server19> ffffffff818a9f73
<server19> ffffffff820a1c00
<server19>
<server19> [ 5449.911803] Call Trace:
<server19> [ 5449.912061]  [<ffffffff818a9f73>] inet_dump_ifaddr+0xfb/0x185
<server19> [ 5449.912332]  [<ffffffff8185de4b>] rtnl_dump_all+0xa9/0xc2
<server19> [ 5449.912601]  [<ffffffff818756d8>] netlink_dump+0xf0/0x25c
<server19> [ 5449.912873]  [<ffffffff818759ed>] netlink_recvmsg+0x1a9/0x2d3
<server19> [ 5449.913142]  [<ffffffff81838412>] sock_recvmsg+0x14/0x16
<server19> [ 5449.913407]  [<ffffffff8183a743>] ___sys_recvmsg+0xea/0x1a1
<server19> [ 5449.913675]  [<ffffffff811658e6>] ?
alloc_pages_vma+0x167/0x1a0
<server19> [ 5449.913945]  [<ffffffff81159a8b>] ?
page_add_new_anon_rmap+0xb4/0xbd
<server19> [ 5449.914212]  [<ffffffff8113b0d0>] ?
lru_cache_add_active_or_unevictable+0x31/0x9d
<server19> [ 5449.914664]  [<ffffffff81151762>] ?
handle_mm_fault+0x632/0x112d
<server19> [ 5449.914940]  [<ffffffff811550fe>] ? vma_merge+0x27e/0x2b1
<server19> [ 5449.915208]  [<ffffffff8183b4db>] __sys_recvmsg+0x3d/0x5e
<server19> [ 5449.915478]  [<ffffffff8183b4db>] ? __sys_recvmsg+0x3d/0x5e
<server19> [ 5449.915747]  [<ffffffff8183b509>] SyS_recvmsg+0xd/0x17
<server19> [ 5449.916017]  [<ffffffff818cb85f>]
entry_SYSCALL_64_fastpath+0x17/0x93

Do you still have the vmlinux file with debug symbols that generated
this panic?