netdev - Re: [PATCH net-next 00/14] ipmr, ip6mr: Allow MC-routing locally-generated MC packets

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Message-ID: <20250611132320.53c5bebc@kernel.org>
Date: Wed, 11 Jun 2025 13:23:20 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Petr Machata <petrm@...dia.com>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, "David Ahern"
 <dsahern@...il.com>, <netdev@...r.kernel.org>, Simon Horman
 <horms@...nel.org>, Nikolay Aleksandrov <razor@...ckwall.org>, Ido Schimmel
 <idosch@...dia.com>, <mlxsw@...dia.com>, Kuniyuki Iwashima
 <kuniyu@...gle.com>
Subject: Re: [PATCH net-next 00/14] ipmr, ip6mr: Allow MC-routing
 locally-generated MC packets

On Wed, 11 Jun 2025 17:30:15 +0200 Petr Machata wrote:
> Could it actually have been caused by another test? The howto page
> mentions that the CI is running the tests one at a time, so I don't
> suppose that's a possibility.
> 
> I'll try to run a more fuller suite tomorrow and star at the code a bit
> to see if I might be missing an error branch or something.

We also hit a crash in ipv6 fcnal.sh, too. Looks like this is either a
kmemleak false positive or possibly related to the rtnl changes in ipv6.
Either way I it's not related to you changes, sorry about that! :(

[ 2900.792890] BUG: kernel NULL pointer dereference, address: 0000000000000108
[ 2900.792961] #PF: supervisor read access in kernel mode
[ 2900.793017] #PF: error_code(0x0000) - not-present page
[ 2900.793053] PGD 8fd6067 P4D 8fd6067 PUD 6402067 PMD 0 
[ 2900.793097] Oops: Oops: 0000 [#1] SMP NOPTI
[ 2900.793127] CPU: 0 UID: 0 PID: 15652 Comm: nettest Not tainted 6.15.0-virtme #1 PREEMPT(voluntary) 
[ 2900.793200] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 2900.793245] RIP: 0010:ip6_pol_route+0x286/0x4a0
[ 2900.793290] Code: 0c 24 0f 85 fb 01 00 00 09 ca 0f 88 2f 01 00 00 e8 cf 11 43 ff 83 cb 08 48 8d 7c 24 18 e8 32 7b ff ff 0f b7 cb ba ff ff ff ff <4c> 8b 80 08 01 00 00 48 89 c6 49 89 c7 49 8d b8 80 06 00 00 4c 89
[ 2900.793422] RSP: 0018:ffffc08a0932f480 EFLAGS: 00010246
[ 2900.793460] RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000008
[ 2900.793521] RDX: 00000000ffffffff RSI: ffffc08a0932f740 RDI: ffff9adac8c8f1a8
[ 2900.793580] RBP: ffff9adac87458c0 R08: 0000000000000000 R09: 0000000000000000
[ 2900.793635] R10: 0000000000000000 R11: 0000000000000040 R12: ffff9adac82e362c
[ 2900.793692] R13: ffff9adac82e3600 R14: 0000000000000080 R15: 0000000000000000
[ 2900.793752] FS:  00007f3418913740(0000) GS:ffff9adb7373a000(0000) knlGS:0000000000000000
[ 2900.793816] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2900.793864] CR2: 0000000000000108 CR3: 0000000008007004 CR4: 0000000000772ef0
[ 2900.793920] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2900.793977] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 2900.794031] PKRU: 55555554
[ 2900.794050] Call Trace:
[ 2900.794070]  <TASK>
[ 2900.794090]  ? __pfx_ip6_pol_route_output+0x10/0x10
[ 2900.794131]  fib6_rule_action+0xe3/0x310
[ 2900.794166]  fib_rules_lookup+0x1b2/0x2b0
[ 2900.794200]  ? __pfx_ip6_pol_route_output+0x10/0x10
[ 2900.794241]  fib6_rule_lookup+0xa9/0x270
[ 2900.794271]  ? __pfx_ip6_pol_route_output+0x10/0x10
[ 2900.794310]  ip6_route_output_flags+0xab/0x180
[ 2900.794353]  ip6_dst_lookup_tail.constprop.0+0x282/0x340
[ 2900.794394]  ip6_dst_lookup_flow+0x46/0xc0
[ 2900.794422]  vrf_xmit+0x100/0x4a0
[ 2900.794459]  dev_hard_start_xmit+0x8d/0x1c0

https://netdev-3.bots.linux.dev/vmksft-net/results/160541/vm-crash-thr0-0