====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc1-syzkaller-00246-g900241a5cc15 #0 Not tainted ------------------------------------------------------ syz.3.3171/15285 is trying to acquire lock: ffff88807d2fc6f0 (&xs->mutex){+.+.}-{4:4}, at: xsk_notifier+0xcf/0x230 net/xdp/xsk.c:1648 but task is already holding lock: ffff88805fc3bc58 (&net->xdp.lock){+.+.}-{4:4}, at: xsk_notifier+0x8b/0x230 net/xdp/xsk.c:1644 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_remove_interfaces+0x4f1/0x700 net/mac80211/iface.c:2316 ieee80211_unregister_hw+0x5d/0x2c0 net/mac80211/main.c:1681 mac80211_hwsim_del_radio+0x2c6/0x4c0 drivers/net/wireless/virtual/mac80211_hwsim.c:5665 hwsim_exit_net+0x5c3/0x670 drivers/net/wireless/virtual/mac80211_hwsim.c:6545 ops_exit_list net/core/net_namespace.c:172 [inline] cleanup_net+0x814/0xd60 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 -> #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] __ia32_sys_bind+0x7a/0x90 net/socket.c:1844 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xb4/0x110 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:331 entry_SYSENTER_compat_after_hwframe+0x84/0x8e -> #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_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: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] ip_tunnel_ctl+0x1f6/0xc40 net/ipv4/ip_tunnel.c:998 ip_tunnel_siocdevprivate+0x107/0x1a0 net/ipv4/ip_tunnel.c:1061 dev_siocdevprivate net/core/dev_ioctl.c:521 [inline] dev_ifsioc+0xc04/0x1010 net/core/dev_ioctl.c:631 dev_ioctl+0x8c3/0x1380 net/core/dev_ioctl.c:848 sock_ioctl+0x819/0x900 net/socket.c:1236 compat_sock_ioctl_trans net/socket.c:-1 [inline] compat_sock_ioctl+0x293/0xf50 net/socket.c:3507 __do_compat_sys_ioctl fs/ioctl.c:1004 [inline] __se_compat_sys_ioctl+0x50e/0xc30 fs/ioctl.c:947 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xb4/0x110 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:331 entry_SYSENTER_compat_after_hwframe+0x84/0x8e 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.3.3171/15285: #0: ffffffff900fd3c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #0: ffffffff900fd3c8 (rtnl_mutex){+.+.}-{4:4}, at: dev_ioctl+0x8b0/0x1380 net/core/dev_ioctl.c:847 #1: ffff88805fc3bc58 (&net->xdp.lock){+.+.}-{4:4}, at: xsk_notifier+0x8b/0x230 net/xdp/xsk.c:1644 stack backtrace: CPU: 0 UID: 0 PID: 15285 Comm: syz.3.3171 Not tainted 6.15.0-rc1-syzkaller-00246-g900241a5cc15 #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_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: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] ip_tunnel_ctl+0x1f6/0xc40 net/ipv4/ip_tunnel.c:998 ip_tunnel_siocdevprivate+0x107/0x1a0 net/ipv4/ip_tunnel.c:1061 dev_siocdevprivate net/core/dev_ioctl.c:521 [inline] dev_ifsioc+0xc04/0x1010 net/core/dev_ioctl.c:631 dev_ioctl+0x8c3/0x1380 net/core/dev_ioctl.c:848 sock_ioctl+0x819/0x900 net/socket.c:1236 compat_sock_ioctl_trans net/socket.c:-1 [inline] compat_sock_ioctl+0x293/0xf50 net/socket.c:3507 __do_compat_sys_ioctl fs/ioctl.c:1004 [inline] __se_compat_sys_ioctl+0x50e/0xc30 fs/ioctl.c:947 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xb4/0x110 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:331 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf744d579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f50b555c EFLAGS: 00000206 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000000089f2 RDX: 0000000080000500 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 90 nop 33: 90 nop 34: 90 nop 35: 90 nop 36: 90 nop 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop