device bridge1 entered promiscuous mode device bridge1 left promiscuous mode ============================================ WARNING: possible recursive locking detected 4.14.226-syzkaller #0 Not tainted -------------------------------------------- syz-executor.0/23450 is trying to acquire lock: (&(&bond->stats_lock)->rlock#3/3){+.+.}, at: [] bond_get_stats+0xb7/0x440 drivers/net/bonding/bond_main.c:3457 but task is already holding lock: (&(&bond->stats_lock)->rlock#3/3){+.+.}, at: [] bond_get_stats+0xb7/0x440 drivers/net/bonding/bond_main.c:3457 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&(&bond->stats_lock)->rlock#3/3); lock(&(&bond->stats_lock)->rlock#3/3); *** DEADLOCK *** May be due to missing lock nesting notation 3 locks held by syz-executor.0/23450: #0: (rtnl_mutex){+.+.}, at: [] rtnl_lock net/core/rtnetlink.c:72 [inline] #0: (rtnl_mutex){+.+.}, at: [] rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4311 #1: (&(&bond->stats_lock)->rlock#3/3){+.+.}, at: [] bond_get_stats+0xb7/0x440 drivers/net/bonding/bond_main.c:3457 #2: (rcu_read_lock){....}, at: [] bond_get_nest_level drivers/net/bonding/bond_main.c:3446 [inline] #2: (rcu_read_lock){....}, at: [] bond_get_stats+0x9b/0x440 drivers/net/bonding/bond_main.c:3457 stack backtrace: CPU: 1 PID: 23450 Comm: syz-executor.0 Not tainted 4.14.226-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_deadlock_bug kernel/locking/lockdep.c:1800 [inline] check_deadlock kernel/locking/lockdep.c:1847 [inline] validate_chain kernel/locking/lockdep.c:2448 [inline] __lock_acquire.cold+0x180/0x97c kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 _raw_spin_lock_nested+0x30/0x40 kernel/locking/spinlock.c:362 bond_get_stats+0xb7/0x440 drivers/net/bonding/bond_main.c:3457 dev_get_stats+0xa5/0x280 net/core/dev.c:8011 bond_get_stats+0x1da/0x440 drivers/net/bonding/bond_main.c:3463 dev_get_stats+0xa5/0x280 net/core/dev.c:8011 rtnl_fill_stats+0x48/0xa90 net/core/rtnetlink.c:1079 rtnl_fill_ifinfo+0xe16/0x3050 net/core/rtnetlink.c:1385 rtmsg_ifinfo_build_skb+0x8e/0x130 net/core/rtnetlink.c:2913 rtmsg_ifinfo_event net/core/rtnetlink.c:2943 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:2934 [inline] rtnetlink_event+0xee/0x1a0 net/core/rtnetlink.c:4360 notifier_call_chain+0x108/0x1a0 kernel/notifier.c:93 call_netdevice_notifiers_info net/core/dev.c:1667 [inline] call_netdevice_notifiers net/core/dev.c:1683 [inline] netdev_features_change net/core/dev.c:1296 [inline] netdev_change_features+0x7e/0xa0 net/core/dev.c:7449 bond_compute_features+0x444/0x860 drivers/net/bonding/bond_main.c:1122 bond_slave_netdev_event drivers/net/bonding/bond_main.c:3191 [inline] bond_netdev_event+0x664/0xbd0 drivers/net/bonding/bond_main.c:3232 notifier_call_chain+0x108/0x1a0 kernel/notifier.c:93 call_netdevice_notifiers_info net/core/dev.c:1667 [inline] call_netdevice_notifiers net/core/dev.c:1683 [inline] netdev_features_change net/core/dev.c:1296 [inline] netdev_change_features+0x7e/0xa0 net/core/dev.c:7449 bond_compute_features+0x444/0x860 drivers/net/bonding/bond_main.c:1122 bond_enslave+0x37e2/0x4cc0 drivers/net/bonding/bond_main.c:1757 do_set_master+0x19e/0x200 net/core/rtnetlink.c:1961 rtnl_newlink+0x134c/0x1830 net/core/rtnetlink.c:2757 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4316 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2433 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1313 netlink_sendmsg+0x62e/0xb80 net/netlink/af_netlink.c:1878 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x466459 RSP: 002b:00007f32ab894188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000005 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffdd7c03caf R14: 00007f32ab894300 R15: 0000000000022000 input: syz0 as /devices/virtual/input/input14 bond1: making interface vlan2 the new active one device bridge1 entered promiscuous mode input: syz0 as /devices/virtual/input/input15 bond1: Enslaving vlan2 as an active interface with an up link bond1: option mode: unable to set because the bond device has slaves syz-executor.0 (23450) used greatest stack depth: 23792 bytes left input: syz0 as /devices/virtual/input/input16 8021q: adding VLAN 0 to HW filter on device bond2 bond0: Enslaving bond2 as an active interface with an up link 8021q: adding VLAN 0 to HW filter on device bond1 bond0: Enslaving bond1 as an active interface with an up link 8021q: adding VLAN 0 to HW filter on device bond1 bond0: Enslaving bond1 as an active interface with an up link device bridge3 entered promiscuous mode device bridge3 left promiscuous mode bond2: making interface vlan3 the new active one device bridge3 entered promiscuous mode bond2: Enslaving vlan3 as an active interface with an up link 8021q: adding VLAN 0 to HW filter on device bond2 bond0: Enslaving bond2 as an active interface with an up link device bridge1 entered promiscuous mode device bridge1 left promiscuous mode bond2: making interface vlan2 the new active one device bridge1 entered promiscuous mode bond2: Enslaving vlan2 as an active interface with an up link device bridge1 entered promiscuous mode device bridge1 left promiscuous mode bond1: making interface vlan2 the new active one device bridge1 entered promiscuous mode bond1: Enslaving vlan2 as an active interface with an up link device bridge1 entered promiscuous mode device bridge1 left promiscuous mode bond1: making interface vlan2 the new active one device bridge1 entered promiscuous mode bond1: Enslaving vlan2 as an active interface with an up link 8021q: adding VLAN 0 to HW filter on device bond3 bond0: Enslaving bond3 as an active interface with an up link device bridge4 entered promiscuous mode device bridge4 left promiscuous mode bond3: making interface vlan4 the new active one device bridge4 entered promiscuous mode bond3: Enslaving vlan4 as an active interface with an up link 8021q: adding VLAN 0 to HW filter on device bond3 bond0: Enslaving bond3 as an active interface with an up link 8021q: adding VLAN 0 to HW filter on device bond2 bond0: Enslaving bond2 as an active interface with an up link device bridge2 entered promiscuous mode device bridge2 left promiscuous mode bond3: making interface vlan3 the new active one device bridge2 entered promiscuous mode input: syz0 as /devices/virtual/input/input17 bond3: Enslaving vlan3 as an active interface with an up link device bridge2 entered promiscuous mode input: syz0 as /devices/virtual/input/input18 device bridge2 left promiscuous mode bond2: making interface vlan3 the new active one device bridge2 entered promiscuous mode bond2: Enslaving vlan3 as an active interface with an up link input: syz0 as /devices/virtual/input/input19 8021q: adding VLAN 0 to HW filter on device bond2 bond0: Enslaving bond2 as an active interface with an up link device bridge2 entered promiscuous mode device bridge2 left promiscuous mode bond2: making interface vlan3 the new active one input: syz0 as /devices/virtual/input/input20 device bridge2 entered promiscuous mode input: syz0 as /devices/virtual/input/input21 bond2: Enslaving vlan3 as an active interface with an up link input: syz0 as /devices/virtual/input/input22 input: syz0 as /devices/virtual/input/input23 8021q: adding VLAN 0 to HW filter on device bond4 bond0: Enslaving bond4 as an active interface with an up link device bridge5 entered promiscuous mode device bridge5 left promiscuous mode bond4: making interface vlan5 the new active one device bridge5 entered promiscuous mode bond4: Enslaving vlan5 as an active interface with an up link input: syz0 as /devices/virtual/input/input24 8021q: adding VLAN 0 to HW filter on device bond4 bond0: Enslaving bond4 as an active interface with an up link input: syz0 as /devices/virtual/input/input25 input: syz0 as /devices/virtual/input/input26 input: syz0 as /devices/virtual/input/input27 device bridge3 entered promiscuous mode device bridge3 left promiscuous mode bond4: making interface vlan4 the new active one device bridge3 entered promiscuous mode bond4: Enslaving vlan4 as an active interface with an up link 8021q: adding VLAN 0 to HW filter on device bond3 input: syz0 as /devices/virtual/input/input28 bond0: Enslaving bond3 as an active interface with an up link input: syz0 as /devices/virtual/input/input29 device bridge3 entered promiscuous mode device bridge3 left promiscuous mode bond3: making interface vlan4 the new active one device bridge3 entered promiscuous mode bond3: Enslaving vlan4 as an active interface with an up link 8021q: adding VLAN 0 to HW filter on device bond3 bond0: Enslaving bond3 as an active interface with an up link device bridge3 entered promiscuous mode input: syz0 as /devices/virtual/input/input30 device bridge3 left promiscuous mode input: syz0 as /devices/virtual/input/input31 bond3: making interface vlan4 the new active one device bridge3 entered promiscuous mode bond3: Enslaving vlan4 as an active interface with an up link input: syz0 as /devices/virtual/input/input32 input: syz0 as /devices/virtual/input/input33 input: syz0 as /devices/virtual/input/input34