Hello
since next-20211018 I got the following crash:
56.084594] BUG: kernel NULL pointer dereference, address: 0000000000000290
[ 56.092367] #PF: supervisor read access in kernel mode
[ 56.097495] #PF: error_code(0x0000) - not-present page
[ 56.102628] PGD 11ceb3067 P4D 11ceb3067 PUD 11ce68067 PMD 0
[ 56.108288] Oops: 0000 [#1] PREEMPT SMP NOPTI
[ 56.112646] CPU: 0 PID: 171 Comm: dhcpcd Tainted: G C 5.15.0-rc6-next-20211019+ #114
[ 56.121684] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./K10N78, BIOS P2.00 07/01/2010
[ 56.130978] RIP: 0010:selinux_ip_postroute_compat+0x4f/0x110
[ 56.136645] Code: 7e 18 00 48 89 d7 f3 48 ab 0f 84 9b 00 00 00 48 8b 43 18 48 85 c0 74 0d 0f b6 48 12 80 f9 0c 0f 84 ad 00 00 00 48 89 54 24 10 <48> 8b a8 90 02 00 00 31 c9 31 d2 48 8b 46 10 4c 8d 44 24 07 48 89
[ 56.155391] RSP: 0018:ffff9a5f4036f8f0 EFLAGS: 00010246
[ 56.160615] RAX: 0000000000000000 RBX: ffff895d9cee8200 RCX: 0000000000000000
[ 56.167740] RDX: ffff9a5f4036f918 RSI: ffff9a5f4036fa88 RDI: ffff9a5f4036f950
[ 56.174865] RBP: ffff895d9cee8200 R08: ffff9a5f4036f9b8 R09: ffffffffb3a2d140
[ 56.181987] R10: ffff895d9d2eb180 R11: ffff895d9cee8200 R12: ffff9a5f4036fa88
[ 56.189113] R13: ffff895d9cee8200 R14: ffff9a5f4036fa88 R15: ffff895d80175218
[ 56.196236] FS: 00007fe0b206a740(0000) GS:ffff895d9fc00000(0000) knlGS:0000000000000000
[ 56.204314] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 56.210050] CR2: 0000000000000290 CR3: 000000011ceec000 CR4: 00000000000006f0
[ 56.217175] Call Trace:
[ 56.219622] <TASK>
[ 56.221728] selinux_ip_postroute+0x177/0x440
[ 56.226084] ? selinux_ip_postroute+0x177/0x440
[ 56.230616] ? __ip6_append_data.isra.0+0xc38/0xff0
[ 56.235496] nf_hook_slow+0x3a/0xa0
[ 56.238988] ip6_finish_output2+0x56c/0x5f0
[ 56.243167] ? ip6_fragment+0x3d4/0x710
[ 56.247005] ? netif_rx_ni+0x100/0x100
[ 56.250758] ip6_send_skb+0x19/0x60
[ 56.254243] rawv6_sendmsg+0xc99/0xf90
[ 56.257996] ? __wake_up_common+0x74/0x140
[ 56.262095] ? sock_sendmsg+0x52/0x60
[ 56.265761] sock_sendmsg+0x52/0x60
[ 56.269245] ____sys_sendmsg+0x20c/0x260
[ 56.273162] ? sendmsg_copy_msghdr+0x74/0x90
[ 56.277434] ___sys_sendmsg+0x7c/0xc0
[ 56.281094] ? sock_read_iter+0x8d/0xf0
[ 56.284932] ? new_sync_read+0x185/0x1a0
[ 56.288858] __sys_sendmsg+0x54/0xa0
[ 56.292436] ? fpregs_assert_state_consistent+0x18/0x40
[ 56.297663] do_syscall_64+0x3b/0x90
[ 56.301241] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 56.306295] RIP: 0033:0x7fe0b2162163
[ 56.309873] Code: 64 89 02 48 c7 c0 ff ff ff ff eb b7 66 2e 0f 1f 84 00 00 00 00 00 90 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 55 c3 0f 1f 40 00 48 83 ec 28 89 54 24 1c 48
[ 56.328610] RSP: 002b:00007fffa63fa0e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[ 56.336168] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fe0b2162163
[ 56.343291] RDX: 0000000000000000 RSI: 00007fffa640a248 RDI: 0000000000000006
[ 56.350415] RBP: 00007fffa641a430 R08: 00007fffa640a280 R09: 00007fffa640a248
[ 56.357540] R10: 0000000000000010 R11: 0000000000000246 R12: 0000000000000000
[ 56.364663] R13: 00007fffa640a304 R14: 0000000000000020 R15: 0000000000000002
[ 56.371789] </TASK>
[ 56.373973] Modules linked in: fc0013 it913x tea5767 tda8290 mxl5005s tda18218 mxl5007t tda18212 xc4000 tuner_xc2028 max2165 tea5761 m88rs6000t mt2060 e4000 mc44s803 qt1010 tuner_simple si2157 tuner_types fc0011 regmap_i2c iscsi_target_mod target_core_file target_core_mod configfs crct10dif_generic crc_t10dif crct10dif_common iptable_nat xt_addrtype nf_log_syslog xt_nat xt_LOG xt_mark xt_MASQUERADE adv7175 saa7110 zr36067(C) videobuf2_dma_contig
[ 56.413371] CR2: 0000000000000290
[ 56.416756] ---[ end trace ffe54c3f1e62823e ]---
[ 56.422726] RIP: 0010:selinux_ip_postroute_compat+0x4f/0x110
[ 56.429765] Code: 7e 18 00 48 89 d7 f3 48 ab 0f 84 9b 00 00 00 48 8b 43 18 48 85 c0 74 0d 0f b6 48 12 80 f9 0c 0f 84 ad 00 00 00 48 89 54 24 10 <48> 8b a8 90 02 00 00 31 c9 31 d2 48 8b 46 10 4c 8d 44 24 07 48 89
[ 56.449899] RSP: 0018:ffff9a5f4036f8f0 EFLAGS: 00010246
[ 56.456506] RAX: 0000000000000000 RBX: ffff895d9cee8200 RCX: 0000000000000000
[ 56.465020] RDX: ffff9a5f4036f918 RSI: ffff9a5f4036fa88 RDI: ffff9a5f4036f950
[ 56.473510] RBP: ffff895d9cee8200 R08: ffff9a5f4036f9b8 R09: ffffffffb3a2d140
[ 56.482042] R10: ffff895d9d2eb180 R11: ffff895d9cee8200 R12: ffff9a5f4036fa88
[ 56.489762] R13: ffff895d9cee8200 R14: ffff9a5f4036fa88 R15: ffff895d80175218
[ 56.496896] FS: 00007fe0b206a740(0000) GS:ffff895d9fc00000(0000) knlGS:0000000000000000
[ 56.504980] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 56.510728] CR2: 0000000000000290 CR3: 000000011ceec000 CR4: 00000000000006f0
Reverting 1d1e1ded1356 ("selinux: make better use of the nf_hook_state passed to the NF hooks") seems to remove this crash.
This is tested on a x86_64 board with x86_64_defconfig
Regards