netdevsim netdevsim5 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 ================================================================== BUG: KCSAN: data-race in desc_read_finalized_seq / prb_reserve write to 0xffffffff868fb7f0 of 8 bytes by task 15918 on cpu 1: prb_reserve+0x750/0xb80 kernel/printk/printk_ringbuffer.c:-1 vprintk_store+0x552/0x860 kernel/printk/printk.c:2326 vprintk_emit+0x1a0/0x6c0 kernel/printk/printk.c:2426 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x7f/0xb0 kernel/printk/printk.c:2475 __ext4_msg+0x198/0x1b0 fs/ext4/super.c:985 ext4_orphan_cleanup+0x2fe/0x9f0 fs/ext4/orphan.c:423 __ext4_fill_super fs/ext4/super.c:5607 [inline] ext4_fill_super+0x3215/0x3580 fs/ext4/super.c:5726 get_tree_bdev_flags+0x2b4/0x330 fs/super.c:1636 get_tree_bdev+0x1f/0x30 fs/super.c:1659 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5758 vfs_get_tree+0x56/0x1e0 fs/super.c:1759 do_new_mount+0x246/0x6b0 fs/namespace.c:3881 path_mount+0x49b/0xb30 fs/namespace.c:4208 do_mount fs/namespace.c:4221 [inline] __do_sys_mount fs/namespace.c:4432 [inline] __se_sys_mount+0x28f/0x2e0 fs/namespace.c:4409 __x64_sys_mount+0x67/0x80 fs/namespace.c:4409 x64_sys_call+0xd11/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0x1a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff868fb7f0 of 8 bytes by task 15908 on cpu 0: desc_read kernel/printk/printk_ringbuffer.c:486 [inline] desc_read_finalized_seq+0x163/0x280 kernel/printk/printk_ringbuffer.c:1874 prb_read kernel/printk/printk_ringbuffer.c:1922 [inline] _prb_read_valid+0x142/0x710 kernel/printk/printk_ringbuffer.c:2113 prb_read_valid+0x42/0x70 kernel/printk/printk_ringbuffer.c:2185 printk_get_next_message+0xdc/0x530 kernel/printk/printk.c:3005 console_emit_next_record kernel/printk/printk.c:3092 [inline] console_flush_all+0x2a9/0x7a0 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xf4/0x350 kernel/printk/printk.c:3325 vprintk_emit+0x470/0x6c0 kernel/printk/printk.c:2450 dev_vprintk_emit+0x24a/0x2a0 drivers/base/core.c:4891 dev_printk_emit+0x84/0xb0 drivers/base/core.c:4902 __netdev_printk+0x352/0x3e0 net/core/dev.c:12403 netdev_info+0x9e/0xd0 net/core/dev.c:12458 nsim_udp_tunnel_unset_port+0x1c8/0x1f0 drivers/net/netdevsim/udp_tunnels.c:64 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+0x594/0xa00 net/ipv4/udp_tunnel_nic.c:289 udp_tunnel_nic_flush+0x234/0x320 net/ipv4/udp_tunnel_nic.c:670 udp_tunnel_nic_unregister net/ipv4/udp_tunnel_nic.c:864 [inline] udp_tunnel_nic_netdevice_event+0x7ba/0xc80 net/ipv4/udp_tunnel_nic.c:904 notifier_call_chain kernel/notifier.c:85 [inline] raw_notifier_call_chain+0x6f/0x1d0 kernel/notifier.c:453 call_netdevice_notifiers_info+0xae/0x100 net/core/dev.c:2176 call_netdevice_notifiers_extack net/core/dev.c:2214 [inline] call_netdevice_notifiers net/core/dev.c:2228 [inline] unregister_netdevice_many_notify+0xdb1/0x16a0 net/core/dev.c:11982 unregister_netdevice_many net/core/dev.c:12046 [inline] unregister_netdevice_queue+0x1fd/0x230 net/core/dev.c:11889 unregister_netdevice include/linux/netdevice.h:3374 [inline] nsim_destroy+0x100/0x380 drivers/net/netdevsim/netdev.c:1064 __nsim_dev_port_del+0xcd/0x100 drivers/net/netdevsim/dev.c:1428 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1440 [inline] nsim_dev_reload_destroy+0x1a6/0x2d0 drivers/net/netdevsim/dev.c:1661 nsim_dev_reload_down+0x77/0xa0 drivers/net/netdevsim/dev.c:968 devlink_reload+0xad/0x5b0 net/devlink/dev.c:461 devlink_nl_reload_doit+0x7b7/0x930 net/devlink/dev.c:584 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x69b/0x6f0 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x12f/0x230 net/netlink/af_netlink.c:2534 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x605/0x6c0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x609/0x720 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x140/0x180 net/socket.c:727 ____sys_sendmsg+0x350/0x4e0 net/socket.c:2566 ___sys_sendmsg net/socket.c:2620 [inline] __sys_sendmsg+0x1a0/0x240 net/socket.c:2652 __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x46/0x50 net/socket.c:2655 x64_sys_call+0x26f3/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0x1a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000001228 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 15908 Comm: gtp Not tainted 6.15.0-rc3-syzkaller-00008-ga33b5a08cbbd #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 ================================================================== netdevsim netdevsim5 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim5 eth0: set [1, 0] type 2 family 0 port 6081 - 0 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