8021q: adding VLAN 0 to HW filter on device bond1 bond0: Enslaving bond1 as an active interface with an up link device bridge1 entered promiscuous mode device bridge1 left promiscuous mode ============================================ WARNING: possible recursive locking detected 4.14.291-syzkaller #0 Not tainted -------------------------------------------- syz-executor.1/15342 is trying to acquire lock: (&(&bond->stats_lock)->rlock#3/3){+.+.}, at: [] bond_get_stats+0xb7/0x440 drivers/net/bonding/bond_main.c:3459 but task is already holding lock: (&(&bond->stats_lock)->rlock#3/3){+.+.}, at: [] bond_get_stats+0xb7/0x440 drivers/net/bonding/bond_main.c:3459 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.1/15342: #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:3459 #2: (rcu_read_lock){....}, at: [] bond_get_nest_level drivers/net/bonding/bond_main.c:3448 [inline] #2: (rcu_read_lock){....}, at: [] bond_get_stats+0x9b/0x440 drivers/net/bonding/bond_main.c:3459 stack backtrace: CPU: 0 PID: 15342 Comm: syz-executor.1 Not tainted 4.14.291-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 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:3459 dev_get_stats+0xa5/0x280 net/core/dev.c:8019 bond_get_stats+0x1da/0x440 drivers/net/bonding/bond_main.c:3465 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:3193 [inline] bond_netdev_event+0x664/0xbd0 drivers/net/bonding/bond_main.c:3234 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: 0033:0x7f6b4c00e279 RSP: 002b:00007f6b4a962168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f6b4c121050 RCX: 00007f6b4c00e279 RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000005 RBP: 00007f6b4c0682e9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffffe65ec3f R14: 00007f6b4a962300 R15: 0000000000022000 bond1: making interface vlan2 the new active one device bridge1 entered promiscuous mode bond1: Enslaving vlan2 as an active interface with an up link syz-executor.1 (15342) used greatest stack depth: 23792 bytes left 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 device bridge2 entered promiscuous mode bond2: Enslaving vlan3 as an active interface with an up link PM: Marking nosave pages: [mem 0x00000000-0x00000fff] PM: Marking nosave pages: [mem 0x0009f000-0x000fffff] PM: Marking nosave pages: [mem 0xbfffd000-0xffffffff] PM: Basic memory bitmaps created PM: Basic memory bitmaps freed PM: Marking nosave pages: [mem 0x00000000-0x00000fff] PM: Marking nosave pages: [mem 0x0009f000-0x000fffff] PM: Marking nosave pages: [mem 0xbfffd000-0xffffffff] PM: Basic memory bitmaps created PM: Basic memory bitmaps freed PM: Marking nosave pages: [mem 0x00000000-0x00000fff] PM: Marking nosave pages: [mem 0x0009f000-0x000fffff] 8021q: adding VLAN 0 to HW filter on device bond1 PM: Marking nosave pages: [mem 0xbfffd000-0xffffffff] bond0: Enslaving bond1 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 PM: Basic memory bitmaps created 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 PM: Basic memory bitmaps freed 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 device bridge5 entered promiscuous mode device bridge5 left promiscuous mode bond1: making interface vlan2 the new active one device bridge5 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 PM: Marking nosave pages: [mem 0x00000000-0x00000fff] bond1: Enslaving vlan2 as an active interface with an up link PM: Marking nosave pages: [mem 0x0009f000-0x000fffff] PM: Marking nosave pages: [mem 0xbfffd000-0xffffffff] PM: Basic memory bitmaps created PM: Basic memory bitmaps freed PM: Marking nosave pages: [mem 0x00000000-0x00000fff] PM: Marking nosave pages: [mem 0x0009f000-0x000fffff] PM: Marking nosave pages: [mem 0xbfffd000-0xffffffff] 8021q: adding VLAN 0 to HW filter on device bond4 PM: Basic memory bitmaps created PM: Basic memory bitmaps freed bond0: Enslaving bond4 as an active interface with an up link PM: Marking nosave pages: [mem 0x00000000-0x00000fff] PM: Marking nosave pages: [mem 0x0009f000-0x000fffff] PM: Marking nosave pages: [mem 0xbfffd000-0xffffffff] device bridge4 entered promiscuous mode PM: Basic memory bitmaps created device bridge4 left promiscuous mode bond4: making interface vlan5 the new active one PM: Basic memory bitmaps freed device bridge4 entered promiscuous mode bond4: Enslaving vlan5 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 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 device bridge2 entered promiscuous mode bond2: Enslaving vlan3 as an active interface with an up link device bridge6 entered promiscuous mode device bridge6 left promiscuous mode bond2: making interface vlan3 the new active one device bridge6 entered promiscuous mode bond2: Enslaving vlan3 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 bond3 bond0: Enslaving bond3 as an active interface with an up link device bridge7 entered promiscuous mode device bridge7 left promiscuous mode bond3: making interface vlan4 the new active one device bridge7 entered promiscuous mode bond3: Enslaving vlan4 as an active interface with an up link 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 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.3'.