device bridge1 entered promiscuous mode 8021q: adding VLAN 0 to HW filter on device bond1 bond0: Enslaving bond1 as an active interface with an up link ============================================ WARNING: possible recursive locking detected 4.14.282-syzkaller #0 Not tainted -------------------------------------------- syz-executor.4/11736 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.4/11736: #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:4317 #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: 0 PID: 11736 Comm: syz-executor.4 Not tainted 4.14.282-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:8019 bond_get_stats+0x1da/0x440 drivers/net/bonding/bond_main.c:3463 dev_get_stats+0xa5/0x280 net/core/dev.c:8019 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:2915 rtmsg_ifinfo_event net/core/rtnetlink.c:2945 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:2936 [inline] rtnetlink_event+0xee/0x1a0 net/core/rtnetlink.c:4366 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:7457 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:7457 bond_compute_features+0x444/0x860 drivers/net/bonding/bond_main.c:1122 bond_enslave+0x37fb/0x4cf0 drivers/net/bonding/bond_main.c:1757 do_set_master+0x19e/0x200 net/core/rtnetlink.c:1961 rtnl_newlink+0x1356/0x1830 net/core/rtnetlink.c:2759 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4322 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2454 netlink_unicast_kernel net/netlink/af_netlink.c:1296 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1322 netlink_sendmsg+0x648/0xbc0 net/netlink/af_netlink.c:1893 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: 0033:0x7f0af6626109 RSP: 002b:00007f0af4f38168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f0af67391d0 RCX: 00007f0af6626109 RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000005 RBP: 00007f0af66800ad R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffffdaebaf R14: 00007f0af4f38300 R15: 0000000000022000 bond1: making interface vlan2 the new active one bond1: Enslaving vlan2 as an active interface with an up link syz-executor.4 (11736) used greatest stack depth: 23792 bytes left device bridge2 entered promiscuous mode 8021q: adding VLAN 0 to HW filter on device bond2 bond0: Enslaving bond2 as an active interface with an up link bond2: making interface vlan3 the new active one bond2: Enslaving vlan3 as an active interface with an up link device bridge3 entered promiscuous mode 8021q: adding VLAN 0 to HW filter on device bond3 bond0: Enslaving bond3 as an active interface with an up link bond3: making interface vlan4 the new active one bond3: Enslaving vlan4 as an active interface with an up link device bridge4 entered promiscuous mode 8021q: adding VLAN 0 to HW filter on device bond4 bond0: Enslaving bond4 as an active interface with an up link bond4: making interface vlan5 the new active one bond4: Enslaving vlan5 as an active interface with an up link syz-executor.4 uses obsolete (PF_INET,SOCK_PACKET) input: syz1 as /devices/virtual/input/input12 input: failed to attach handler leds to device input12, error: -6 mmap: syz-executor.3 (12272) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt. input: syz1 as /devices/virtual/input/input13 input: failed to attach handler leds to device input13, error: -6 input: syz1 as /devices/virtual/input/input14 input: failed to attach handler leds to device input14, error: -6 input: syz1 as /devices/virtual/input/input15 input: failed to attach handler leds to device input15, error: -6 input: syz1 as /devices/virtual/input/input16 input: syz1 as /devices/virtual/input/input17 input: failed to attach handler leds to device input16, error: -6 EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue input: failed to attach handler leds to device input17, error: -6 autofs4:pid:12472:autofs4_fill_super: called with bogus options input: syz1 as /devices/virtual/input/input18 input: failed to attach handler leds to device input18, error: -6 input: syz1 as /devices/virtual/input/input19 input: failed to attach handler leds to device input19, error: -6 autofs4:pid:12491:autofs4_fill_super: called with bogus options autofs4:pid:12500:autofs4_fill_super: called with bogus options input: syz1 as /devices/virtual/input/input20 input: failed to attach handler leds to device input20, error: -6 input: syz1 as /devices/virtual/input/input21 autofs4:pid:12524:autofs4_fill_super: called with bogus options input: failed to attach handler leds to device input21, error: -6 EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue IPVS: sync thread started: state = MASTER, mcast_ifn = veth0_macvtap, syncid = 1, id = 0 EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue IPVS: sync thread started: state = MASTER, mcast_ifn = veth0_macvtap, syncid = 1, id = 0 EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue IPVS: sync thread started: state = MASTER, mcast_ifn = veth0_macvtap, syncid = 1, id = 0 EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue IPVS: sync thread started: state = MASTER, mcast_ifn = veth0_macvtap, syncid = 1, id = 0 IPVS: sync thread started: state = MASTER, mcast_ifn = veth0_macvtap, syncid = 1, id = 0