====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc2-syzkaller-00037-g834a4a689699 #0 Not tainted ------------------------------------------------------ syz.4.5508/18132 is trying to acquire lock: ffff8880275066f0 (&xs->mutex){+.+.}-{4:4}, at: xsk_diag_fill net/xdp/xsk_diag.c:113 [inline] ffff8880275066f0 (&xs->mutex){+.+.}-{4:4}, at: xsk_diag_dump+0x61d/0x1660 net/xdp/xsk_diag.c:166 but task is already holding lock: ffff888012e75c58 (&net->xdp.lock){+.+.}-{4:4}, at: xsk_diag_dump+0x162/0x1660 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}: __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746 xsk_notifier+0xa4/0x280 net/xdp/xsk.c:1644 notifier_call_chain+0xb9/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2174 call_netdevice_notifiers_extack net/core/dev.c:2212 [inline] call_netdevice_notifiers net/core/dev.c:2226 [inline] unregister_netdevice_many_notify+0xe84/0x25a0 net/core/dev.c:11971 unregister_netdevice_many net/core/dev.c:12035 [inline] unregister_netdevice_queue+0x305/0x3f0 net/core/dev.c:11887 unregister_netdevice include/linux/netdevice.h:3374 [inline] _cfg80211_unregister_wdev+0x64b/0x830 net/wireless/core.c:1256 ieee80211_remove_interfaces+0x34e/0x720 net/mac80211/iface.c:2316 ieee80211_unregister_hw+0x55/0x3a0 net/mac80211/main.c:1681 mac80211_hwsim_del_radio drivers/net/wireless/virtual/mac80211_hwsim.c:5665 [inline] hwsim_exit_net+0x3ac/0x7d0 drivers/net/wireless/virtual/mac80211_hwsim.c:6545 ops_exit_list+0xb0/0x180 net/core/net_namespace.c:172 cleanup_net+0x5c1/0xb30 net/core/net_namespace.c:654 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400 kthread+0x3c2/0x780 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #2 (&rdev->wiphy.mtx){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746 class_wiphy_constructor include/net/cfg80211.h:6092 [inline] cfg80211_netdev_notifier_call+0x2bd/0x10f0 net/wireless/core.c:1547 notifier_call_chain+0xb9/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2174 call_netdevice_notifiers_extack net/core/dev.c:2212 [inline] call_netdevice_notifiers net/core/dev.c:2226 [inline] __dev_close_many+0xff/0x770 net/core/dev.c:1671 dev_close_many+0x233/0x630 net/core/dev.c:1725 unregister_netdevice_many_notify+0x384/0x25a0 net/core/dev.c:11940 unregister_netdevice_many net/core/dev.c:12035 [inline] default_device_exit_batch+0x853/0xaf0 net/core/dev.c:12527 ops_exit_list+0x128/0x180 net/core/net_namespace.c:177 cleanup_net+0x5c1/0xb30 net/core/net_namespace.c:654 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400 kthread+0x3c2/0x780 kernel/kthread.c:464 ret_from_fork+0x45/0x80 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}: __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x199/0xb90 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+0x37c/0x15d0 net/xdp/xsk.c:1188 __sys_bind_socket net/socket.c:1810 [inline] __sys_bind_socket net/socket.c:1802 [inline] __sys_bind+0x211/0x260 net/socket.c:1841 __do_sys_bind net/socket.c:1846 [inline] __se_sys_bind net/socket.c:1844 [inline] __x64_sys_bind+0x72/0xb0 net/socket.c:1844 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 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 kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746 xsk_diag_fill net/xdp/xsk_diag.c:113 [inline] xsk_diag_dump+0x61d/0x1660 net/xdp/xsk_diag.c:166 netlink_dump+0x53b/0xd00 net/netlink/af_netlink.c:2309 __netlink_dump_start+0x6d6/0x990 net/netlink/af_netlink.c:2424 netlink_dump_start include/linux/netlink.h:340 [inline] xsk_diag_handler_dump+0x1aa/0x240 net/xdp/xsk_diag.c:193 __sock_diag_cmd net/core/sock_diag.c:249 [inline] sock_diag_rcv_msg+0x437/0x790 net/core/sock_diag.c:287 netlink_rcv_skb+0x16a/0x440 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] sock_write_iter+0x4fc/0x5b0 net/socket.c:1131 do_iter_readv_writev+0x654/0x950 fs/read_write.c:825 vfs_writev+0x353/0xdc0 fs/read_write.c:1055 do_writev+0x295/0x330 fs/read_write.c:1101 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 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.4.5508/18132: #0: ffff8880299256d0 (nlk_cb_mutex-SOCK_DIAG){+.+.}-{4:4}, at: __netlink_dump_start+0x150/0x990 net/netlink/af_netlink.c:2388 #1: ffff888012e75c58 (&net->xdp.lock){+.+.}-{4:4}, at: xsk_diag_dump+0x162/0x1660 net/xdp/xsk_diag.c:158 stack backtrace: CPU: 0 UID: 0 PID: 18132 Comm: syz.4.5508 Not tainted 6.15.0-rc2-syzkaller-00037-g834a4a689699 #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+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2079 check_noncircular+0x14c/0x170 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 kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746 xsk_diag_fill net/xdp/xsk_diag.c:113 [inline] xsk_diag_dump+0x61d/0x1660 net/xdp/xsk_diag.c:166 netlink_dump+0x53b/0xd00 net/netlink/af_netlink.c:2309 __netlink_dump_start+0x6d6/0x990 net/netlink/af_netlink.c:2424 netlink_dump_start include/linux/netlink.h:340 [inline] xsk_diag_handler_dump+0x1aa/0x240 net/xdp/xsk_diag.c:193 __sock_diag_cmd net/core/sock_diag.c:249 [inline] sock_diag_rcv_msg+0x437/0x790 net/core/sock_diag.c:287 netlink_rcv_skb+0x16a/0x440 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] sock_write_iter+0x4fc/0x5b0 net/socket.c:1131 do_iter_readv_writev+0x654/0x950 fs/read_write.c:825 vfs_writev+0x353/0xdc0 fs/read_write.c:1055 do_writev+0x295/0x330 fs/read_write.c:1101 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe25cb8d169 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:00007fe25d916038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007fe25cda5fa0 RCX: 00007fe25cb8d169 RDX: 0000000000000001 RSI: 0000200000019440 RDI: 0000000000000004 RBP: 00007fe25cc0e990 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fe25cda5fa0 R15: 00007ffdc0b97708