netdevsim netdevsim5 eth1: set [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim5 eth2: set [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim5 eth3: set [1, 0] type 2 family 0 port 6081 - 0 ================================================================== BUG: KCSAN: data-race in console_flush_all / console_flush_all write to 0xffffffff86a213c8 of 8 bytes by task 4509 on cpu 0: console_emit_next_record kernel/printk/printk.c:3099 [inline] console_flush_all+0x35a/0x730 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xa1/0x330 kernel/printk/printk.c:3325 vprintk_emit+0x388/0x650 kernel/printk/printk.c:2450 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 caif_disconnect_client+0x13d/0x150 net/caif/cfcnfg.c:194 caif_release+0xec/0x230 net/caif/caif_socket.c:918 __sock_release net/socket.c:647 [inline] sock_close+0x6b/0x150 net/socket.c:1391 __fput+0x29b/0x650 fs/file_table.c:465 ____fput+0x1c/0x30 fs/file_table.c:493 task_work_run+0x131/0x1a0 kernel/task_work.c:227 get_signal+0xe13/0xf70 kernel/signal.c:2807 arch_do_signal_or_restart+0x96/0x480 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x7a/0x100 kernel/entry/common.c:111 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x1d6/0x200 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff86a213c8 of 8 bytes by task 4510 on cpu 1: console_flush_all+0x563/0x730 kernel/printk/printk.c:3227 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xa1/0x330 kernel/printk/printk.c:3325 vprintk_emit+0x388/0x650 kernel/printk/printk.c:2450 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:12509 netdev_info+0x9b/0xd0 net/core/dev.c:12564 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+0x567/0x9c0 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_push_rx_port+0xe9/0x120 net/ipv4/udp_tunnel_core.c:111 geneve_offload_rx_ports drivers/net/geneve.c:1185 [inline] geneve_netdevice_event+0x173/0x1b0 drivers/net/geneve.c:1929 notifier_call_chain kernel/notifier.c:85 [inline] raw_notifier_call_chain+0x6c/0x1b0 kernel/notifier.c:453 call_netdevice_notifiers_info+0xae/0x100 net/core/dev.c:2230 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline] call_netdevice_notifiers+0x48/0x70 net/core/dev.c:2282 udp_tunnel_get_rx_info include/net/udp_tunnel.h:138 [inline] udp_tunnel_nic_register net/ipv4/udp_tunnel_nic.c:825 [inline] udp_tunnel_nic_netdevice_event+0xa54/0xc90 net/ipv4/udp_tunnel_nic.c:893 notifier_call_chain kernel/notifier.c:85 [inline] raw_notifier_call_chain+0x6c/0x1b0 kernel/notifier.c:453 call_netdevice_notifiers_info+0xae/0x100 net/core/dev.c:2230 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline] call_netdevice_notifiers net/core/dev.c:2282 [inline] register_netdevice+0xd48/0xf00 net/core/dev.c:11143 nsim_init_netdevsim drivers/net/netdevsim/netdev.c:965 [inline] nsim_create+0x5b7/0x780 drivers/net/netdevsim/netdev.c:1033 __nsim_dev_port_add+0x477/0x640 drivers/net/netdevsim/dev.c:1393 nsim_dev_port_add_all+0x31/0xc0 drivers/net/netdevsim/dev.c:1449 nsim_dev_reload_create drivers/net/netdevsim/dev.c:1501 [inline] nsim_dev_reload_up+0x30c/0x480 drivers/net/netdevsim/dev.c:988 devlink_reload+0x318/0x580 net/devlink/dev.c:474 devlink_nl_reload_doit+0x503/0x8f0 net/devlink/dev.c:584 genl_family_rcv_msg_doit+0x143/0x1b0 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x422/0x460 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x120/0x220 net/netlink/af_netlink.c:2552 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x5a8/0x680 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x58b/0x6b0 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x145/0x180 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 value changed: 0x000000000000087b -> 0x000000000000087c Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 4510 Comm: syz.5.181 Not tainted 6.16.0-rc7-syzkaller-00093-g94ce1ac2c9b4 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ================================================================== syz.5.181 (4510) used greatest stack depth: 8608 bytes left