====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc2-syzkaller-00577-g8066e388be48 #0 Not tainted ------------------------------------------------------ syz.3.1099/10564 is trying to acquire lock: ffff88805d8c8d30 (&dev_instance_lock_key#20){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2750 [inline] ffff88805d8c8d30 (&dev_instance_lock_key#20){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:42 [inline] ffff88805d8c8d30 (&dev_instance_lock_key#20){+.+.}-{4:4}, at: xsk_bind+0x2fd/0xfb0 net/xdp/xsk.c:1188 but task is already holding lock: ffff88807c5046f0 (&xs->mutex){+.+.}-{4:4}, at: xsk_bind+0x166/0xfb0 net/xdp/xsk.c:1176 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&xs->mutex){+.+.}-{4:4}: lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866 __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x1a5/0x10c0 kernel/locking/mutex.c:746 xsk_notifier+0xcf/0x230 net/xdp/xsk.c:1648 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2266 [inline] call_netdevice_notifiers net/core/dev.c:2280 [inline] unregister_netdevice_many_notify+0x16b7/0x2640 net/core/dev.c:12036 rtnl_newlink_create+0x90b/0xc30 net/core/rtnetlink.c:3862 __rtnl_newlink net/core/rtnetlink.c:3951 [inline] rtnl_newlink+0x18b0/0x1fe0 net/core/rtnetlink.c:4066 rtnetlink_rcv_msg+0x80f/0xd70 net/core/rtnetlink.c:6956 netlink_rcv_skb+0x208/0x480 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x7f8/0x9a0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8c3/0xcd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:727 ____sys_sendmsg+0x523/0x860 net/socket.c:2566 ___sys_sendmsg net/socket.c:2620 [inline] __sys_sendmsg+0x271/0x360 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&net->xdp.lock){+.+.}-{4:4}: lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866 __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x1a5/0x10c0 kernel/locking/mutex.c:746 xsk_notifier+0x8b/0x230 net/xdp/xsk.c:1644 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2266 [inline] call_netdevice_notifiers net/core/dev.c:2280 [inline] unregister_netdevice_many_notify+0x16b7/0x2640 net/core/dev.c:12036 unregister_netdevice_many net/core/dev.c:12099 [inline] unregister_netdevice_queue+0x383/0x400 net/core/dev.c:11943 register_netdevice+0x1733/0x1b80 net/core/dev.c:11108 bpq_new_device drivers/net/hamradio/bpqether.c:481 [inline] bpq_device_event+0x4a9/0x620 drivers/net/hamradio/bpqether.c:523 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 __dev_notify_flags+0x209/0x410 net/core/dev.c:-1 netif_change_flags+0xf0/0x1a0 net/core/dev.c:9489 dev_change_flags+0x146/0x270 net/core/dev_api.c:68 devinet_ioctl+0xea4/0x1d80 net/ipv4/devinet.c:1200 inet_ioctl+0x3d9/0x4f0 net/ipv4/af_inet.c:1001 sock_do_ioctl+0x152/0x400 net/socket.c:1190 sock_ioctl+0x644/0x900 net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&dev_instance_lock_key#20){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xa69/0x24e0 kernel/locking/lockdep.c:3909 __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235 lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866 __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x1a5/0x10c0 kernel/locking/mutex.c:746 netdev_lock include/linux/netdevice.h:2750 [inline] netdev_lock_ops include/net/netdev_lock.h:42 [inline] xsk_bind+0x2fd/0xfb0 net/xdp/xsk.c:1188 __sys_bind_socket net/socket.c:1810 [inline] __sys_bind+0x1de/0x290 net/socket.c:1841 __do_sys_bind net/socket.c:1846 [inline] __se_sys_bind net/socket.c:1844 [inline] __x64_sys_bind+0x7a/0x90 net/socket.c:1844 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &dev_instance_lock_key#20 --> &net->xdp.lock --> &xs->mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&xs->mutex); lock(&net->xdp.lock); lock(&xs->mutex); lock(&dev_instance_lock_key#20); *** DEADLOCK *** 2 locks held by syz.3.1099/10564: #0: ffffffff900fe908 (rtnl_mutex){+.+.}-{4:4}, at: xsk_bind+0x153/0xfb0 net/xdp/xsk.c:1175 #1: ffff88807c5046f0 (&xs->mutex){+.+.}-{4:4}, at: xsk_bind+0x166/0xfb0 net/xdp/xsk.c:1176 stack backtrace: CPU: 0 UID: 0 PID: 10564 Comm: syz.3.1099 Not tainted 6.15.0-rc2-syzkaller-00577-g8066e388be48 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2079 check_noncircular+0x142/0x160 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xa69/0x24e0 kernel/locking/lockdep.c:3909 __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235 lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866 __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x1a5/0x10c0 kernel/locking/mutex.c:746 netdev_lock include/linux/netdevice.h:2750 [inline] netdev_lock_ops include/net/netdev_lock.h:42 [inline] xsk_bind+0x2fd/0xfb0 net/xdp/xsk.c:1188 __sys_bind_socket net/socket.c:1810 [inline] __sys_bind+0x1de/0x290 net/socket.c:1841 __do_sys_bind net/socket.c:1846 [inline] __se_sys_bind net/socket.c:1844 [inline] __x64_sys_bind+0x7a/0x90 net/socket.c:1844 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f131bf8e169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1319df6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007f131c1b5fa0 RCX: 00007f131bf8e169 RDX: 000000000000002a RSI: 00002000000001c0 RDI: 0000000000000009 RBP: 00007f131c010a68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f131c1b5fa0 R15: 00007fff22e54c28