netdevsim netdevsim1 eth2 (unregistering): unset [0, 0] type 1 family 0 port 8472 - 0 ================================================================== BUG: KCSAN: data-race in data_alloc / prb_reserve write to 0xffffffff8688c530 of 8 bytes by task 21716 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 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 __ext4_error_inode+0x2ca/0x3f0 fs/ext4/super.c:844 ext4_do_update_inode fs/ext4/inode.c:5568 [inline] ext4_mark_iloc_dirty+0x35e/0xda0 fs/ext4/inode.c:6224 __ext4_mark_inode_dirty+0x2e2/0x3f0 fs/ext4/inode.c:6430 __ext4_ext_dirty+0xdb/0x1f0 fs/ext4/extents.c:206 ext4_ext_insert_extent+0x13db/0x29b0 fs/ext4/extents.c:2192 ext4_ext_map_blocks+0x10b8/0x38a0 fs/ext4/extents.c:4404 ext4_map_create_blocks fs/ext4/inode.c:609 [inline] ext4_map_blocks+0x61c/0xd70 fs/ext4/inode.c:813 ext4_getblk+0x114/0x510 fs/ext4/inode.c:960 ext4_bread+0x28/0x110 fs/ext4/inode.c:1023 ext4_quota_write+0x167/0x360 fs/ext4/super.c:7297 write_blk fs/quota/quota_tree.c:70 [inline] get_free_dqblk+0x208/0x340 fs/quota/quota_tree.c:136 do_insert_tree+0x19a/0x9b0 fs/quota/quota_tree.c:347 do_insert_tree+0x753/0x9b0 fs/quota/quota_tree.c:402 do_insert_tree+0x731/0x9b0 fs/quota/quota_tree.c:402 dq_insert_tree fs/quota/quota_tree.c:432 [inline] qtree_write_dquot+0x2cb/0x300 fs/quota/quota_tree.c:451 v2_write_dquot+0xda/0x140 fs/quota/quota_v2.c:372 dquot_acquire+0x1c0/0x2b0 fs/quota/dquot.c:470 ext4_acquire_dquot+0x15f/0x200 fs/ext4/super.c:6929 dqget+0x532/0x8d0 fs/quota/dquot.c:977 __dquot_initialize+0x20c/0x7c0 fs/quota/dquot.c:1505 dquot_initialize+0x1a/0x30 fs/quota/dquot.c:1567 ext4_setattr+0x1c0/0xfd0 fs/ext4/inode.c:5794 notify_change+0x806/0x890 fs/attr.c:552 chown_common+0x2be/0x3f0 fs/open.c:790 do_fchownat+0x110/0x210 fs/open.c:821 __do_sys_fchownat fs/open.c:836 [inline] __se_sys_fchownat fs/open.c:833 [inline] __x64_sys_fchownat+0x64/0x80 fs/open.c:833 x64_sys_call+0x2b9e/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:261 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 0xffffffff8688c530 of 8 bytes by task 11893 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 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_unset_port+0x1bd/0x1e0 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+0x567/0x9c0 net/ipv4/udp_tunnel_nic.c:289 udp_tunnel_nic_flush+0x21b/0x300 net/ipv4/udp_tunnel_nic.c:670 udp_tunnel_nic_unregister net/ipv4/udp_tunnel_nic.c:864 [inline] udp_tunnel_nic_netdevice_event+0x791/0xc90 net/ipv4/udp_tunnel_nic.c:904 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] unregister_netdevice_many_notify+0xd9d/0x1690 net/core/dev.c:12077 unregister_netdevice_many net/core/dev.c:12140 [inline] unregister_netdevice_queue+0x1f5/0x220 net/core/dev.c:11984 unregister_netdevice include/linux/netdevice.h:3379 [inline] nsim_destroy+0xf4/0x360 drivers/net/netdevsim/netdev.c:1069 __nsim_dev_port_del+0xcf/0x110 drivers/net/netdevsim/dev.c:1428 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1440 [inline] nsim_dev_reload_destroy+0x1a3/0x2c0 drivers/net/netdevsim/dev.c:1661 nsim_dev_reload_down+0x67/0x80 drivers/net/netdevsim/dev.c:968 devlink_reload+0xad/0x580 net/devlink/dev.c:461 devlink_pernet_pre_exit+0xdb/0x230 net/devlink/core.c:509 ops_pre_exit_list net/core/net_namespace.c:162 [inline] ops_undo_list+0xb2/0x410 net/core/net_namespace.c:235 cleanup_net+0x2de/0x4d0 net/core/net_namespace.c:686 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3321 worker_thread+0x582/0x770 kernel/workqueue.c:3402 kthread+0x489/0x510 kernel/kthread.c:464 ret_from_fork+0xda/0x150 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 value changed: 0x0000000000035f60 -> 0x00000000000def20 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 11893 Comm: kworker/u8:43 Not tainted 6.16.0-rc7-syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: netns cleanup_net ================================================================== netdevsim netdevsim1 eth2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim1 eth1 (unregistering): unset [0, 0] type 1 family 0 port 8472 - 0 netdevsim netdevsim1 eth1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim1 eth0 (unregistering): unset [0, 0] type 1 family 0 port 8472 - 0 netdevsim netdevsim1 eth0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 bridge_slave_1: left allmulticast mode bridge_slave_1: left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state bridge_slave_0: left allmulticast mode bridge_slave_0: left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state bond0 (unregistering): (slave bond_slave_0): Releasing backup interface bond0 (unregistering): (slave bond_slave_1): Releasing backup interface bond0 (unregistering): Released all slaves hsr_slave_0: left promiscuous mode hsr_slave_1: left promiscuous mode veth1_macvtap: left promiscuous mode veth0_macvtap: left promiscuous mode team0 (unregistering): Port device team_slave_1 removed team0 (unregistering): Port device team_slave_0 removed bridge_slave_1: left allmulticast mode bridge_slave_1: left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state bridge_slave_0: left allmulticast mode bridge_slave_0: left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state $Hÿ (unregistering): (slave bond_slave_0): Releasing backup interface $Hÿ (unregistering): (slave bond_slave_1): Releasing backup interface $Hÿ (unregistering): (slave dummy0): Releasing backup interface $Hÿ (unregistering): Released all slaves hsr_slave_0: left promiscuous mode hsr_slave_1: left promiscuous mode batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_1 team0 (unregistering): Port device team_slave_1 removed team0 (unregistering): Port device team_slave_0 removed