====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc1-syzkaller-00165-ge861041e976b #0 Not tainted ------------------------------------------------------ syz.0.2625/15616 is trying to acquire lock: ffff8880542646f0 (&xs->mutex){+.+.}-{4:4}, at: xsk_diag_fill net/xdp/xsk_diag.c:113 [inline] ffff8880542646f0 (&xs->mutex){+.+.}-{4:4}, at: xsk_diag_dump+0x5be/0x19d0 net/xdp/xsk_diag.c:166 but task is already holding lock: ffff888035b35c58 (&net->xdp.lock){+.+.}-{4:4}, at: xsk_diag_dump+0x18e/0x19d0 net/xdp/xsk_diag.c:158 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&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:2212 [inline] call_netdevice_notifiers net/core/dev.c:2226 [inline] unregister_netdevice_many_notify+0x1572/0x2510 net/core/dev.c:11971 unregister_netdevice_many net/core/dev.c:12035 [inline] unregister_netdevice_queue+0x383/0x400 net/core/dev.c:11887 unregister_netdevice include/linux/netdevice.h:3374 [inline] _cfg80211_unregister_wdev+0x163/0x590 net/wireless/core.c:1256 ieee80211_if_remove+0x25d/0x320 net/mac80211/iface.c:2259 ieee80211_del_iface+0x19/0x30 net/mac80211/cfg.c:224 rdev_del_virtual_intf net/wireless/rdev-ops.h:62 [inline] cfg80211_remove_virtual_intf+0x23f/0x410 net/wireless/util.c:2871 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0xb38/0xf00 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x208/0x480 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+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+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (&rdev->wiphy.mtx){+.+.}-{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 class_wiphy_constructor include/net/cfg80211.h:6092 [inline] cfg80211_netdev_notifier_call+0x1b3/0x1430 net/wireless/core.c:1547 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2212 [inline] call_netdevice_notifiers net/core/dev.c:2226 [inline] __dev_close_many+0x15d/0x760 net/core/dev.c:1671 dev_close_many+0x250/0x4c0 net/core/dev.c:1725 unregister_netdevice_many_notify+0x628/0x2510 net/core/dev.c:11940 unregister_netdevice_many net/core/dev.c:12035 [inline] default_device_exit_batch+0x7ff/0x880 net/core/dev.c:12527 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x8af/0xd60 net/core/net_namespace.c:654 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319 worker_thread+0x870/0xd50 kernel/workqueue.c:3400 kthread+0x7b7/0x940 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #1 (&dev_instance_lock_key#3){+.+.}-{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 netdev_lock include/linux/netdevice.h:2751 [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+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&xs->mutex){+.+.}-{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 xsk_diag_fill net/xdp/xsk_diag.c:113 [inline] xsk_diag_dump+0x5be/0x19d0 net/xdp/xsk_diag.c:166 netlink_dump+0x678/0xeb0 net/netlink/af_netlink.c:2309 __netlink_dump_start+0x5a2/0x790 net/netlink/af_netlink.c:2424 netlink_dump_start include/linux/netlink.h:340 [inline] xsk_diag_handler_dump+0x1de/0x270 net/xdp/xsk_diag.c:193 sock_diag_rcv_msg+0x3dc/0x5f0 net/core/sock_diag.c:-1 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 sock_write_iter+0x2d9/0x3f0 net/socket.c:1131 do_iter_readv_writev+0x71f/0x9d0 fs/read_write.c:-1 vfs_writev+0x38d/0xbc0 fs/read_write.c:1055 do_writev+0x1b8/0x360 fs/read_write.c:1101 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 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: &xs->mutex --> &rdev->wiphy.mtx --> &net->xdp.lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&net->xdp.lock); lock(&rdev->wiphy.mtx); lock(&net->xdp.lock); lock(&xs->mutex); *** DEADLOCK *** 2 locks held by syz.0.2625/15616: #0: ffff888011d776d0 (nlk_cb_mutex-SOCK_DIAG){+.+.}-{4:4}, at: __netlink_dump_start+0x119/0x790 net/netlink/af_netlink.c:2388 #1: ffff888035b35c58 (&net->xdp.lock){+.+.}-{4:4}, at: xsk_diag_dump+0x18e/0x19d0 net/xdp/xsk_diag.c:158 stack backtrace: CPU: 1 UID: 0 PID: 15616 Comm: syz.0.2625 Not tainted 6.15.0-rc1-syzkaller-00165-ge861041e976b #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 xsk_diag_fill net/xdp/xsk_diag.c:113 [inline] xsk_diag_dump+0x5be/0x19d0 net/xdp/xsk_diag.c:166 netlink_dump+0x678/0xeb0 net/netlink/af_netlink.c:2309 __netlink_dump_start+0x5a2/0x790 net/netlink/af_netlink.c:2424 netlink_dump_start include/linux/netlink.h:340 [inline] xsk_diag_handler_dump+0x1de/0x270 net/xdp/xsk_diag.c:193 sock_diag_rcv_msg+0x3dc/0x5f0 net/core/sock_diag.c:-1 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 sock_write_iter+0x2d9/0x3f0 net/socket.c:1131 do_iter_readv_writev+0x71f/0x9d0 fs/read_write.c:-1 vfs_writev+0x38d/0xbc0 fs/read_write.c:1055 do_writev+0x1b8/0x360 fs/read_write.c:1101 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1f2058d169 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:00007f1f21379038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f1f207a6080 RCX: 00007f1f2058d169 RDX: 0000000000000001 RSI: 0000200000019440 RDI: 0000000000000005 RBP: 00007f1f2060e990 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f1f207a6080 R15: 00007fff90063ed8 netlink: 56 bytes leftover after parsing attributes in process `syz.0.2625'.