============================================ WARNING: possible recursive locking detected 4.14.275-syzkaller #0 Not tainted -------------------------------------------- syz-executor.2/10849 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.2/10849: #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: 10849 Comm: syz-executor.2 Not tainted 4.14.275-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:2446 netlink_unicast_kernel net/netlink/af_netlink.c:1294 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1320 netlink_sendmsg+0x648/0xbc0 net/netlink/af_netlink.c:1891 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: 0033:0x7fda3f25b0e9 RSP: 002b:00007fda3dbd0168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fda3f36df60 RCX: 00007fda3f25b0e9 RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000005 RBP: 00007fda3f2b508d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffcf63647f R14: 00007fda3dbd0300 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.2 (10849) used greatest stack depth: 23792 bytes left audit: type=1804 audit(1650068151.312:28): pid=10948 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir2496986327/syzkaller.Ri2E1E/26/bus" dev="sda1" ino=14020 res=1 8021q: adding VLAN 0 to HW filter on device batadv1 EXT4-fs warning (device sda1): ext4_group_extend:1807: will only finish group (524288 blocks, 256 new) bond0: Enslaving batadv1 as an active interface with an up link EXT4-fs warning (device sda1): ext4_group_extend:1813: can't read last block, resize aborted audit: type=1804 audit(1650068151.342:29): pid=10948 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir2496986327/syzkaller.Ri2E1E/26/bus" dev="sda1" ino=14020 res=1 audit: type=1804 audit(1650068151.432:30): pid=10966 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir2496986327/syzkaller.Ri2E1E/27/bus" dev="sda1" ino=14023 res=1 audit: type=1804 audit(1650068151.432:31): pid=10966 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir2496986327/syzkaller.Ri2E1E/27/bus" dev="sda1" ino=14023 res=1 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. audit: type=1804 audit(1650068151.542:32): pid=11022 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir2496986327/syzkaller.Ri2E1E/28/bus" dev="sda1" ino=14019 res=1 8021q: adding VLAN 0 to HW filter on device bond2 audit: type=1804 audit(1650068151.542:33): pid=11015 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir2496986327/syzkaller.Ri2E1E/28/bus" dev="sda1" ino=14019 res=1 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 8021q: adding VLAN 0 to HW filter on device batadv3 bond0: Enslaving batadv3 as an active interface with an up link 8021q: adding VLAN 0 to HW filter on device batadv1 bond0: Enslaving batadv1 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 batadv5 bond0: Enslaving batadv5 as an active interface with an up link audit: type=1804 audit(1650068152.052:34): pid=11192 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir1924936537/syzkaller.r65ZOV/24/bus" dev="sda1" ino=14033 res=1 audit: type=1804 audit(1650068152.052:35): pid=11192 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir1924936537/syzkaller.r65ZOV/24/bus" dev="sda1" ino=14033 res=1 8021q: adding VLAN 0 to HW filter on device batadv1 bond0: Enslaving batadv1 as an active interface with an up link netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'. 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 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 batadv3 bond0: Enslaving batadv3 as an active interface with an up link ufs: ufs was compiled with read-only support, can't be mounted as read-write ufs: ufs was compiled with read-only support, can't be mounted as read-write ufs: ufs was compiled with read-only support, can't be mounted as read-write ufs: ufs was compiled with read-only support, can't be mounted as read-write ntfs: (device loop1): parse_options(): Option utf8 is no longer supported, using option nls=utf8. Please use option nls=utf8 in the future and make sure utf8 is compiled either as a module or into the kernel. ntfs: (device loop1): parse_options(): NLS character set macr#žeŔWHƒyŔŽ6—oman not found. Using previous one utf8. ntfs: (device loop1): parse_options(): Unrecognized mount option case_sensitive´yes. ntfs: (device loop1): parse_options(): The uid option requires an argument.