netdev - Re: [PATCH bpf v3 0/3] sockmap fixes picked up by stress tests

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Message-ID: <20210727173713.qm24aiwli2bacrlm@kafai-mbp.dhcp.thefacebook.com>
Date:   Tue, 27 Jul 2021 10:37:13 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     John Fastabend <john.fastabend@...il.com>
CC:     <jakub@...udflare.com>, <daniel@...earbox.net>,
        <xiyou.wangcong@...il.com>, <alexei.starovoitov@...il.com>,
        <bpf@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH bpf v3 0/3] sockmap fixes picked up by stress tests

On Tue, Jul 27, 2021 at 09:04:57AM -0700, John Fastabend wrote:
> Running stress tests with recent patch to remove an extra lock in sockmap
> resulted in a couple new issues popping up. It seems only one of them
> is actually related to the patch:
> 
> 799aa7f98d53 ("skmsg: Avoid lock_sock() in sk_psock_backlog()")
> 
> The other two issues had existed long before, but I guess the timing
> with the serialization we had before was too tight to get any of
> our tests or deployments to hit it.
> 
> With attached series stress testing sockmap+TCP with workloads that
> create lots of short-lived connections no more splats like below were
> seen on upstream bpf branch.
> 
> [224913.935822] WARNING: CPU: 3 PID: 32100 at net/core/stream.c:208 sk_stream_kill_queues+0x212/0x220
> [224913.935841] Modules linked in: fuse overlay bpf_preload x86_pkg_temp_thermal intel_uncore wmi_bmof squashfs sch_fq_codel efivarfs ip_tables x_tables uas xhci_pci ixgbe mdio xfrm_algo xhci_hcd wmi
> [224913.935897] CPU: 3 PID: 32100 Comm: fgs-bench Tainted: G          I       5.14.0-rc1alu+ #181
> [224913.935908] Hardware name: Dell Inc. Precision 5820 Tower/002KVM, BIOS 1.9.2 01/24/2019
> [224913.935914] RIP: 0010:sk_stream_kill_queues+0x212/0x220
> [224913.935923] Code: 8b 83 20 02 00 00 85 c0 75 20 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 89 df e8 2b 11 fe ff eb c3 0f 0b e9 7c ff ff ff 0f 0b eb ce <0f> 0b 5b 5d 41 5c 41 5d 41 5e 41 5f c3 90 0f 1f 44 00 00 41 57 41
> [224913.935932] RSP: 0018:ffff88816271fd38 EFLAGS: 00010206
> [224913.935941] RAX: 0000000000000ae8 RBX: ffff88815acd5240 RCX: dffffc0000000000
> [224913.935948] RDX: 0000000000000003 RSI: 0000000000000ae8 RDI: ffff88815acd5460
> [224913.935954] RBP: ffff88815acd5460 R08: ffffffff955c0ae8 R09: fffffbfff2e6f543
> [224913.935961] R10: ffffffff9737aa17 R11: fffffbfff2e6f542 R12: ffff88815acd5390
> [224913.935967] R13: ffff88815acd5480 R14: ffffffff98d0c080 R15: ffffffff96267500
> [224913.935974] FS:  00007f86e6bd1700(0000) GS:ffff888451cc0000(0000) knlGS:0000000000000000
> [224913.935981] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [224913.935988] CR2: 000000c0008eb000 CR3: 00000001020e0005 CR4: 00000000003706e0
> [224913.935994] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [224913.936000] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [224913.936007] Call Trace:
> [224913.936016]  inet_csk_destroy_sock+0xba/0x1f0
> [224913.936033]  __tcp_close+0x620/0x790
> [224913.936047]  tcp_close+0x20/0x80
> [224913.936056]  inet_release+0x8f/0xf0
> [224913.936070]  __sock_release+0x72/0x120
> 
> v3: make sock_drop inline in skmsg.h
> v2: init skb to null and fix a space/tab issue. Added Jakub's acks.
Acked-by: Martin KaFai Lau <kafai@...com>