SELinux:  policydb magic number 0x0 does not match expected magic number 0xf97cff8c
SELinux: failed to load policy
can0: slcan on ttyS3.
==================================================================
BUG: KCSAN: data-race in data_alloc / prb_reserve

write to 0xffffffff86869e58 of 8 bytes by task 31044 on cpu 0:
 data_alloc+0x27d/0x2b0 kernel/printk/printk_ringbuffer.c:1096
 prb_reserve+0x808/0xaf0 kernel/printk/printk_ringbuffer.c:1669
 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2326
 vprintk_emit+0x178/0x650 kernel/printk/printk.c:2426
 dev_vprintk_emit+0x242/0x2a0 drivers/base/core.c:4917
 dev_printk_emit+0x84/0xb0 drivers/base/core.c:4928
 __netdev_printk+0x35c/0x3e0 net/core/dev.c:12508
 netdev_info+0x9b/0xd0 net/core/dev.c:12563
 nsim_udp_tunnel_set_port+0x171/0x190 drivers/net/netdevsim/udp_tunnels.c:34
 udp_tunnel_nic_device_sync_one net/ipv4/udp_tunnel_nic.c:-1 [inline]
 udp_tunnel_nic_device_sync_by_port net/ipv4/udp_tunnel_nic.c:246 [inline]
 __udp_tunnel_nic_device_sync+0x564/0x9c0 net/ipv4/udp_tunnel_nic.c:289
 udp_tunnel_nic_device_sync net/ipv4/udp_tunnel_nic.c:312 [inline]
 __udp_tunnel_nic_add_port+0x6a9/0x720 net/ipv4/udp_tunnel_nic.c:531
 udp_tunnel_nic_add_port include/net/udp_tunnel.h:365 [inline]
 udp_tunnel_notify_add_rx_port+0x12b/0x190 net/ipv4/udp_tunnel_core.c:143
 geneve_socket_create drivers/net/geneve.c:612 [inline]
 geneve_sock_add+0x3c2/0x5b0 drivers/net/geneve.c:687
 geneve_open+0x66/0xf0 drivers/net/geneve.c:723
 __dev_open+0x2d2/0x530 net/core/dev.c:1683
 __dev_change_flags+0x163/0x400 net/core/dev.c:9458
 rtnl_configure_link net/core/rtnetlink.c:3577 [inline]
 rtnl_newlink_create+0x36b/0x620 net/core/rtnetlink.c:3833
 __rtnl_newlink net/core/rtnetlink.c:3940 [inline]
 rtnl_newlink+0xf29/0x12d0 net/core/rtnetlink.c:4055
 rtnetlink_rcv_msg+0x5fe/0x6d0 net/core/rtnetlink.c:6944
 netlink_rcv_skb+0x123/0x220 net/netlink/af_netlink.c:2534
 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:6971
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x5a1/0x670 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x58b/0x6b0 net/netlink/af_netlink.c:1883
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg+0x142/0x180 net/socket.c:727
 ____sys_sendmsg+0x31e/0x4e0 net/socket.c:2566
 ___sys_sendmsg+0x17b/0x1d0 net/socket.c:2620
 __sys_sendmsg net/socket.c:2652 [inline]
 __do_sys_sendmsg net/socket.c:2657 [inline]
 __se_sys_sendmsg net/socket.c:2655 [inline]
 __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2655
 x64_sys_call+0x2999/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff86869e58 of 8 bytes by task 31033 on cpu 1:
 desc_read kernel/printk/printk_ringbuffer.c:482 [inline]
 desc_push_tail kernel/printk/printk_ringbuffer.c:778 [inline]
 desc_reserve kernel/printk/printk_ringbuffer.c:924 [inline]
 prb_reserve+0x221/0xaf0 kernel/printk/printk_ringbuffer.c:1619
 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2326
 vprintk_emit+0x178/0x650 kernel/printk/printk.c:2426
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2475
 __netdev_printk+0x321/0x3e0 net/core/dev.c:12516
 netdev_info+0x9b/0xd0 net/core/dev.c:12563
 slcan_close+0xb8/0xe0 drivers/net/can/slcan/slcan-core.c:894
 tty_ldisc_close+0x74/0xa0 drivers/tty/tty_ldisc.c:455
 tty_set_ldisc+0x1b9/0x380 drivers/tty/tty_ldisc.c:557
 tiocsetd+0x51/0x60 drivers/tty/tty_io.c:2439
 tty_ioctl+0xa7f/0xb80 drivers/tty/tty_io.c:2738
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:893
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:893
 x64_sys_call+0x19a8/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x000000000010b6d0 -> 0x00000000001a4600

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 31033 Comm: syz.6.10052 Not tainted 6.15.0-syzkaller-11173-g546b1c9e93c2 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
==================================================================
can0 (unregistered): slcan off ttyS3.