EXT4-fs warning (device sda1): verify_group_input:136: Cannot add at group 4294967295 (only 16 groups)
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
4.14.281-syzkaller #0 Not tainted
--------------------------------------------
syz-executor.0/10425 is trying to acquire lock:
 (&(&bond->stats_lock)->rlock#3/3){+.+.}, at: [<ffffffff83caf4b7>] 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: [<ffffffff83caf4b7>] 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.0/10425:
 #0:  (rtnl_mutex){+.+.}, at: [<ffffffff85c8859d>] rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0:  (rtnl_mutex){+.+.}, at: [<ffffffff85c8859d>] rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4317
 #1:  (&(&bond->stats_lock)->rlock#3/3){+.+.}, at: [<ffffffff83caf4b7>] bond_get_stats+0xb7/0x440 drivers/net/bonding/bond_main.c:3457
 #2:  (rcu_read_lock){....}, at: [<ffffffff83caf49b>] bond_get_nest_level drivers/net/bonding/bond_main.c:3446 [inline]
 #2:  (rcu_read_lock){....}, at: [<ffffffff83caf49b>] bond_get_stats+0x9b/0x440 drivers/net/bonding/bond_main.c:3457

stack backtrace:
CPU: 0 PID: 10425 Comm: syz-executor.0 Not tainted 4.14.281-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: 0033:0x7f2709b4f109
RSP: 002b:00007f2708461168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f2709c621d0 RCX: 00007f2709b4f109
RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000005
RBP: 00007f2709ba908d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcf0c68eaf R14: 00007f2708461300 R15: 0000000000022000
bond1: making interface vlan2 the new active one
bond1: Enslaving vlan2 as an active interface with an up link
syz-executor.0 (10425) used greatest stack depth: 23792 bytes left
device bridge4 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 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
IPVS: ftp: loaded support on port[0] = 21
device bridge5 entered promiscuous mode
8021q: adding VLAN 0 to HW filter on device bond4
bond0: Enslaving bond4 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
bond4: making interface vlan5 the new active one
bond4: Enslaving vlan5 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
caif:caif_disconnect_client(): nothing to disconnect
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
Zero length message leads to an empty skb
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
audit: type=1804 audit(1653653223.873:8): pid=11235 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir3041154283/syzkaller.3GvFSO/59/cgroup.controllers" dev="sda1" ino=14059 res=1
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
device tunl0 entered promiscuous mode
device vlan2 entered promiscuous mode
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
NILFS (loop2): broken superblock, retrying with spare superblock (blocksize = 1024)
device tunl0 left promiscuous mode
EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue
NILFS (loop2): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
NILFS (loop2): broken superblock, retrying with spare superblock (blocksize = 1024)
EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue
NILFS (loop2): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
audit: type=1804 audit(1653653224.393:9): pid=11290 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir3041154283/syzkaller.3GvFSO/60/cgroup.controllers" dev="sda1" ino=14056 res=1
device tunl0 entered promiscuous mode
device vlan2 entered promiscuous mode
device tunl0 left promiscuous mode
NILFS (loop2): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop2): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
device tunl0 entered promiscuous mode
device vlan5 entered promiscuous mode
device tunl0 left promiscuous mode
NILFS (loop2): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop2): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
audit: type=1804 audit(1653653225.043:10): pid=11368 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir3041154283/syzkaller.3GvFSO/61/cgroup.controllers" dev="sda1" ino=14057 res=1
device tunl0 entered promiscuous mode
device vlan5 entered promiscuous mode
device tunl0 left promiscuous mode
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
device tunl0 entered promiscuous mode
device vlan2 entered promiscuous mode
device tunl0 left promiscuous mode
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
ieee80211 : Selected rate control algorithm 'minstrel_ht'
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
ieee80211 : hwaddr 02:00:00:00:02:00 registered
device tunl0 entered promiscuous mode
device vlan2 entered promiscuous mode
device tunl0 left promiscuous mode
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
device tunl0 entered promiscuous mode
device vlan5 entered promiscuous mode
audit: type=1804 audit(1653653225.743:11): pid=11428 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir3041154283/syzkaller.3GvFSO/62/cgroup.controllers" dev="sda1" ino=13995 res=1
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
device tunl0 left promiscuous mode
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
ieee80211 phy3: Selected rate control algorithm 'minstrel_ht'
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
ieee80211 phy3: hwaddr 02:00:00:00:03:00 registered
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
ieee80211 phy4: Selected rate control algorithm 'minstrel_ht'
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
ieee80211 phy4: hwaddr 02:00:00:00:04:00 registered
ieee80211 phy5: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy5: hwaddr 02:00:00:00:05:00 registered