====================================================== WARNING: possible circular locking dependency detected 6.13.0-syzkaller-04046-g0ad9617c78ac #0 Not tainted ------------------------------------------------------ syz.1.471/7627 is trying to acquire lock: ffff88807bb68218 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff88807bb68218 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{3:3}, at: __dev_xmit_skb net/core/dev.c:4008 [inline] ffff88807bb68218 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{3:3}, at: __dev_queue_xmit+0x23f9/0x3f50 net/core/dev.c:4550 but task is already holding lock: ffff88807ea51108 (&local->handle_wake_tx_queue_lock){+.-.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff88807ea51108 (&local->handle_wake_tx_queue_lock){+.-.}-{3:3}, at: ieee80211_handle_wake_tx_queue+0x8a/0x2d0 net/mac80211/util.c:310 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&local->handle_wake_tx_queue_lock){+.-.}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] ieee80211_handle_wake_tx_queue+0x8a/0x2d0 net/mac80211/util.c:310 drv_wake_tx_queue net/mac80211/driver-ops.h:1366 [inline] schedule_and_wake_txq net/mac80211/driver-ops.h:1373 [inline] ieee80211_queue_skb+0x1ae9/0x24b0 net/mac80211/tx.c:1664 ieee80211_tx+0x2c4/0x470 net/mac80211/tx.c:1967 __ieee80211_subif_start_xmit+0xe93/0x1600 net/mac80211/tx.c:4339 ieee80211_subif_start_xmit+0xde/0x4d0 net/mac80211/tx.c:4533 __netdev_start_xmit include/linux/netdevice.h:5144 [inline] netdev_start_xmit include/linux/netdevice.h:5153 [inline] xmit_one net/core/dev.c:3735 [inline] dev_hard_start_xmit+0x27a/0x7d0 net/core/dev.c:3751 __dev_queue_xmit+0x1b73/0x3f50 net/core/dev.c:4584 neigh_output include/net/neighbour.h:539 [inline] ip6_finish_output2+0x12ad/0x1780 net/ipv6/ip6_output.c:141 ip6_finish_output+0x41e/0x840 net/ipv6/ip6_output.c:226 NF_HOOK+0x9e/0x430 include/linux/netfilter.h:314 mld_sendpack+0x843/0xdb0 net/ipv6/mcast.c:1862 mld_send_cr net/ipv6/mcast.c:2163 [inline] mld_ifc_work+0x7d9/0xd90 net/ipv6/mcast.c:2697 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #1 (_xmit_ETHER#2){+.-.}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] __netif_tx_lock include/linux/netdevice.h:4584 [inline] sch_direct_xmit+0x1a7/0x5d0 net/sched/sch_generic.c:341 __dev_xmit_skb net/core/dev.c:3974 [inline] __dev_queue_xmit+0x1a8f/0x3f50 net/core/dev.c:4550 lapb_data_transmit+0x91/0xb0 net/lapb/lapb_iface.c:447 lapb_transmit_buffer+0x168/0x1f0 net/lapb/lapb_out.c:149 lapb_establish_data_link+0x84/0xd0 lapb_device_event+0x4e0/0x670 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 __dev_notify_flags+0x207/0x400 dev_change_flags+0xf0/0x1a0 net/core/dev.c:9249 devinet_ioctl+0xcce/0x1ac0 net/ipv4/devinet.c:1208 inet_ioctl+0x3d7/0x4f0 net/ipv4/af_inet.c:1001 sock_do_ioctl+0x158/0x460 net/socket.c:1194 sock_ioctl+0x626/0x8e0 net/socket.c:1313 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{3:3}: check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] __dev_xmit_skb net/core/dev.c:4008 [inline] __dev_queue_xmit+0x23f9/0x3f50 net/core/dev.c:4550 dev_queue_xmit include/linux/netdevice.h:3305 [inline] __netlink_deliver_tap_skb net/netlink/af_netlink.c:307 [inline] __netlink_deliver_tap+0x56b/0x7f0 net/netlink/af_netlink.c:325 netlink_deliver_tap+0x19d/0x1b0 net/netlink/af_netlink.c:338 __netlink_sendskb net/netlink/af_netlink.c:1265 [inline] netlink_sendskb+0x68/0x140 net/netlink/af_netlink.c:1274 netlink_unicast+0x39d/0x990 net/netlink/af_netlink.c:1363 nlmsg_unicast include/net/netlink.h:1161 [inline] genlmsg_unicast include/net/genetlink.h:553 [inline] hwsim_unicast_netgroup+0x1c4/0x2a0 drivers/net/wireless/virtual/mac80211_hwsim.c:1424 mac80211_hwsim_tx_frame_nl+0xbad/0x11f0 drivers/net/wireless/virtual/mac80211_hwsim.c:1604 drv_tx net/mac80211/driver-ops.h:37 [inline] wake_tx_push_queue net/mac80211/util.c:298 [inline] ieee80211_handle_wake_tx_queue+0x1ae/0x2d0 net/mac80211/util.c:315 drv_wake_tx_queue net/mac80211/driver-ops.h:1366 [inline] schedule_and_wake_txq net/mac80211/driver-ops.h:1373 [inline] ieee80211_queue_skb+0x1ae9/0x24b0 net/mac80211/tx.c:1664 ieee80211_tx+0x2c4/0x470 net/mac80211/tx.c:1967 __ieee80211_subif_start_xmit+0xe93/0x1600 net/mac80211/tx.c:4339 ieee80211_subif_start_xmit+0xde/0x4d0 net/mac80211/tx.c:4533 __netdev_start_xmit include/linux/netdevice.h:5144 [inline] netdev_start_xmit include/linux/netdevice.h:5153 [inline] xmit_one net/core/dev.c:3735 [inline] dev_hard_start_xmit+0x27a/0x7d0 net/core/dev.c:3751 __dev_queue_xmit+0x1b73/0x3f50 net/core/dev.c:4584 dev_queue_xmit include/linux/netdevice.h:3305 [inline] __bpf_tx_skb+0x18e/0x260 net/core/filter.c:2135 ____bpf_clone_redirect net/core/filter.c:2460 [inline] bpf_clone_redirect+0x26f/0x3d0 net/core/filter.c:2430 bpf_prog_c6f54bbad6dab1ee+0x5f/0x64 bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline] __bpf_prog_run include/linux/filter.h:701 [inline] bpf_prog_run include/linux/filter.h:708 [inline] bpf_test_run+0x4f0/0xa90 net/bpf/test_run.c:434 bpf_prog_test_run_skb+0xca2/0x1820 net/bpf/test_run.c:1095 bpf_prog_test_run+0x2e4/0x360 kernel/bpf/syscall.c:4402 __sys_bpf+0x48d/0x810 kernel/bpf/syscall.c:5808 __do_sys_bpf kernel/bpf/syscall.c:5897 [inline] __se_sys_bpf kernel/bpf/syscall.c:5895 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5895 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: dev->qdisc_tx_busylock ?: &qdisc_tx_busylock --> _xmit_ETHER#2 --> &local->handle_wake_tx_queue_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&local->handle_wake_tx_queue_lock); lock(_xmit_ETHER#2); lock(&local->handle_wake_tx_queue_lock); lock(dev->qdisc_tx_busylock ?: &qdisc_tx_busylock); *** DEADLOCK *** 8 locks held by syz.1.471/7627: #0: ffffffff8e93a3e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e93a3e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e93a3e0 (rcu_read_lock){....}-{1:3}, at: bpf_test_timer_enter+0x19/0x140 net/bpf/test_run.c:40 #1: ffffffff8e93a440 (rcu_read_lock_bh){....}-{1:3}, at: local_bh_disable include/linux/bottom_half.h:20 [inline] #1: ffffffff8e93a440 (rcu_read_lock_bh){....}-{1:3}, at: rcu_read_lock_bh include/linux/rcupdate.h:901 [inline] #1: ffffffff8e93a440 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x2f4/0x3f50 net/core/dev.c:4509 #2: ffff88802a3a2118 (_xmit_ETHER#2){+.-.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] #2: ffff88802a3a2118 (_xmit_ETHER#2){+.-.}-{3:3}, at: __netif_tx_lock include/linux/netdevice.h:4584 [inline] #2: ffff88802a3a2118 (_xmit_ETHER#2){+.-.}-{3:3}, at: __dev_queue_xmit+0x1822/0x3f50 net/core/dev.c:4580 #3: ffffffff8e93a3e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #3: ffffffff8e93a3e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #3: ffffffff8e93a3e0 (rcu_read_lock){....}-{1:3}, at: __ieee80211_subif_start_xmit+0x300/0x1600 net/mac80211/tx.c:4288 #4: ffff88807ea51108 (&local->handle_wake_tx_queue_lock){+.-.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] #4: ffff88807ea51108 (&local->handle_wake_tx_queue_lock){+.-.}-{3:3}, at: ieee80211_handle_wake_tx_queue+0x8a/0x2d0 net/mac80211/util.c:310 #5: ffffffff8e93a3e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #5: ffffffff8e93a3e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #5: ffffffff8e93a3e0 (rcu_read_lock){....}-{1:3}, at: hwsim_unicast_netgroup+0x2a/0x2a0 drivers/net/wireless/virtual/mac80211_hwsim.c:1421 #6: ffffffff8e93a3e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #6: ffffffff8e93a3e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #6: ffffffff8e93a3e0 (rcu_read_lock){....}-{1:3}, at: netlink_deliver_tap+0x2e/0x1b0 net/netlink/af_netlink.c:335 #7: ffffffff8e93a440 (rcu_read_lock_bh){....}-{1:3}, at: local_bh_disable include/linux/bottom_half.h:20 [inline] #7: ffffffff8e93a440 (rcu_read_lock_bh){....}-{1:3}, at: rcu_read_lock_bh include/linux/rcupdate.h:901 [inline] #7: ffffffff8e93a440 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x2f4/0x3f50 net/core/dev.c:4509 stack backtrace: CPU: 0 UID: 0 PID: 7627 Comm: syz.1.471 Not tainted 6.13.0-syzkaller-04046-g0ad9617c78ac #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2076 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208 check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] __dev_xmit_skb net/core/dev.c:4008 [inline] __dev_queue_xmit+0x23f9/0x3f50 net/core/dev.c:4550 dev_queue_xmit include/linux/netdevice.h:3305 [inline] __netlink_deliver_tap_skb net/netlink/af_netlink.c:307 [inline] __netlink_deliver_tap+0x56b/0x7f0 net/netlink/af_netlink.c:325 netlink_deliver_tap+0x19d/0x1b0 net/netlink/af_netlink.c:338 __netlink_sendskb net/netlink/af_netlink.c:1265 [inline] netlink_sendskb+0x68/0x140 net/netlink/af_netlink.c:1274 netlink_unicast+0x39d/0x990 net/netlink/af_netlink.c:1363 nlmsg_unicast include/net/netlink.h:1161 [inline] genlmsg_unicast include/net/genetlink.h:553 [inline] hwsim_unicast_netgroup+0x1c4/0x2a0 drivers/net/wireless/virtual/mac80211_hwsim.c:1424 mac80211_hwsim_tx_frame_nl+0xbad/0x11f0 drivers/net/wireless/virtual/mac80211_hwsim.c:1604 drv_tx net/mac80211/driver-ops.h:37 [inline] wake_tx_push_queue net/mac80211/util.c:298 [inline] ieee80211_handle_wake_tx_queue+0x1ae/0x2d0 net/mac80211/util.c:315 drv_wake_tx_queue net/mac80211/driver-ops.h:1366 [inline] schedule_and_wake_txq net/mac80211/driver-ops.h:1373 [inline] ieee80211_queue_skb+0x1ae9/0x24b0 net/mac80211/tx.c:1664 ieee80211_tx+0x2c4/0x470 net/mac80211/tx.c:1967 __ieee80211_subif_start_xmit+0xe93/0x1600 net/mac80211/tx.c:4339 ieee80211_subif_start_xmit+0xde/0x4d0 net/mac80211/tx.c:4533 __netdev_start_xmit include/linux/netdevice.h:5144 [inline] netdev_start_xmit include/linux/netdevice.h:5153 [inline] xmit_one net/core/dev.c:3735 [inline] dev_hard_start_xmit+0x27a/0x7d0 net/core/dev.c:3751 __dev_queue_xmit+0x1b73/0x3f50 net/core/dev.c:4584 dev_queue_xmit include/linux/netdevice.h:3305 [inline] __bpf_tx_skb+0x18e/0x260 net/core/filter.c:2135 ____bpf_clone_redirect net/core/filter.c:2460 [inline] bpf_clone_redirect+0x26f/0x3d0 net/core/filter.c:2430 bpf_prog_c6f54bbad6dab1ee+0x5f/0x64 bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline] __bpf_prog_run include/linux/filter.h:701 [inline] bpf_prog_run include/linux/filter.h:708 [inline] bpf_test_run+0x4f0/0xa90 net/bpf/test_run.c:434 bpf_prog_test_run_skb+0xca2/0x1820 net/bpf/test_run.c:1095 bpf_prog_test_run+0x2e4/0x360 kernel/bpf/syscall.c:4402 __sys_bpf+0x48d/0x810 kernel/bpf/syscall.c:5808 __do_sys_bpf kernel/bpf/syscall.c:5897 [inline] __se_sys_bpf kernel/bpf/syscall.c:5895 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5895 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9ef1b8cda9 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:00007f9ef2a23038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f9ef1da6080 RCX: 00007f9ef1b8cda9 RDX: 0000000000000050 RSI: 0000000020000380 RDI: 000000000000000a RBP: 00007f9ef1c0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f9ef1da6080 R15: 00007ffc05ced5e8