Kernel BUG after stress test on MTU 80

[EvgeniiMekhanik]

Start test: t_frang.test_concurrent_connections.ConcurrentConnections.test_three_clients_same_ip
[ 662.095529] [tdb] Start Tempesta DB
[ 662.110691] [tempesta fw] Initializing Tempesta FW kernel module...
[ 662.178538] [tempesta fw] Configuration processing is completed.
[ 662.201323] [tdb] Opened table /opt/tempesta/db/filter0.tdb: size=16777216 rec_size=20 base=000000004962a372
[ 662.290063] [tdb] Opened table /opt/tempesta/db/cache0.tdb: size=268435456 rec_size=0 base=00000000a651c430
[ 662.296314] [tdb] Opened table /opt/tempesta/db/sessions0.tdb: size=16777216 rec_size=312 base=000000004d101e40
[ 662.302256] [tdb] Opened table /opt/tempesta/db/client0.tdb: size=16777216 rec_size=624 base=00000000814aecfe
[ 662.326859] [tempesta fw] Open listen socket on: 0.0.0.0
[ 662.342734] [tempesta fw] Tempesta FW is ready
[ 662.428997] [tempesta fw] Warning: frang: connections max num. exceeded for 127.0.0.1: 3 (lim=2)
[ 662.429628] BUG: kernel NULL pointer dereference, address: 0000000000000000
[ 662.430093] #PF: supervisor instruction fetch in kernel mode
[ 662.430472] #PF: error_code(0x0010) - not-present page
[ 662.430827] PGD 0 P4D 0
[ 662.431052] Oops: 0010 [#1] SMP NOPTI
[ 662.431301] CPU: 0 PID: 22160 Comm: python3 Tainted: G OE 5.10.35+ #270
[ 662.431818] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014
[ 662.432353] RIP: 0010:0x0
[ 662.432534] Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
[ 662.432989] RSP: 0018:ffffc17ac0003a50 EFLAGS: 00010282
[ 662.433336] RAX: 0000000000000000 RBX: ffffffff8b1d6d40 RCX: 000000000000008a
[ 662.433796] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff9b799e97d580
[ 662.434256] RBP: ffffc17ac0003a58 R08: 0000000000000000 R09: 0000000000000000
[ 662.434715] R10: ffffc17ac0003b20 R11: 00000000fc1741a3 R12: ffff9b799e97d580
[ 662.435181] R13: 0000000000000000 R14: ffff9b7850bb4000 R15: ffff9b799e97d580
[ 662.435641] FS: 00007f6060403000(0000) GS:ffff9b79bbc00000(0000) knlGS:0000000000000000
[ 662.436162] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 662.436534] CR2: ffffffffffffffd6 CR3: 000000014faca000 CR4: 0000000000750ef0
[ 662.436996] PKRU: 55555554
[ 662.437176] Call Trace:
[ 662.437340]
[ 662.437479] tempesta_sk_free+0x28/0x30
[ 662.437732] security_sk_free+0x27/0x40
[ 662.437991] __sk_destruct+0x13d/0x1f0
[ 662.438236] __sk_free+0x71/0x120

[EvgeniiMekhanik]

Was reproduced on current master d754b17

[EvgeniiMekhanik]

I catch this panic on invalid kernel