syzbot

netlink: 'syz-executor010': attribute type 1 has an invalid length.
bond1: (slave gretap1): making interface the new active one
======================================================
WARNING: possible circular locking dependency detected
5.6.0-rc5-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor010/10258 is trying to acquire lock:
ffffffff8a1d3b00 (lock#3){+.+.}, at: cma_netdev_callback+0xc5/0x380 drivers/infiniband/core/cma.c:4612

but task is already holding lock:
ffffffff8a34eb80 (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
ffffffff8a34eb80 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5433

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (rtnl_mutex){+.+.}:
       __mutex_lock_common kernel/locking/mutex.c:956 [inline]
       __mutex_lock+0x156/0x13c0 kernel/locking/mutex.c:1103
       siw_create_listen+0x329/0xed0 drivers/infiniband/sw/siw/siw_cm.c:1951
       iw_cm_listen+0x166/0x1e0 drivers/infiniband/core/iwcm.c:584
       cma_iw_listen drivers/infiniband/core/cma.c:2450 [inline]
       rdma_listen+0x5e2/0x910 drivers/infiniband/core/cma.c:3621
       cma_listen_on_dev+0x512/0x650 drivers/infiniband/core/cma.c:2501
       cma_add_one+0x6aa/0xb60 drivers/infiniband/core/cma.c:4673
       add_client_context+0x3b4/0x520 drivers/infiniband/core/device.c:681
       enable_device_and_get+0x1cd/0x3b0 drivers/infiniband/core/device.c:1316
       ib_register_device drivers/infiniband/core/device.c:1382 [inline]
       ib_register_device+0xa12/0xda0 drivers/infiniband/core/device.c:1343
       siw_device_register drivers/infiniband/sw/siw/siw_main.c:70 [inline]
       siw_newlink drivers/infiniband/sw/siw/siw_main.c:565 [inline]
       siw_newlink+0xdef/0x1310 drivers/infiniband/sw/siw/siw_main.c:542
       nldev_newlink+0x27f/0x400 drivers/infiniband/core/nldev.c:1538
       rdma_nl_rcv_msg drivers/infiniband/core/netlink.c:195 [inline]
       rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]
       rdma_nl_rcv+0x586/0x900 drivers/infiniband/core/netlink.c:259
       netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
       netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329
       netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918
       sock_sendmsg_nosec net/socket.c:652 [inline]
       sock_sendmsg+0xcf/0x120 net/socket.c:672
       ____sys_sendmsg+0x6b9/0x7d0 net/socket.c:2343
       ___sys_sendmsg+0x100/0x170 net/socket.c:2397
       __sys_sendmsg+0xec/0x1b0 net/socket.c:2430
       do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:294
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #0 (lock#3){+.+.}:
       check_prev_add kernel/locking/lockdep.c:2475 [inline]
       check_prevs_add kernel/locking/lockdep.c:2580 [inline]
       validate_chain kernel/locking/lockdep.c:2970 [inline]
       __lock_acquire+0x201b/0x3ca0 kernel/locking/lockdep.c:3954
       lock_acquire+0x197/0x420 kernel/locking/lockdep.c:4484
       __mutex_lock_common kernel/locking/mutex.c:956 [inline]
       __mutex_lock+0x156/0x13c0 kernel/locking/mutex.c:1103
       cma_netdev_callback+0xc5/0x380 drivers/infiniband/core/cma.c:4612
       notifier_call_chain+0xc0/0x230 kernel/notifier.c:83
       call_netdevice_notifiers_info net/core/dev.c:1948 [inline]
       call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1933
       call_netdevice_notifiers_extack net/core/dev.c:1960 [inline]
       call_netdevice_notifiers+0x79/0xa0 net/core/dev.c:1974
       bond_change_active_slave+0x80e/0x1d90 drivers/net/bonding/bond_main.c:944
       bond_select_active_slave+0x250/0xa60 drivers/net/bonding/bond_main.c:986
       bond_enslave+0x4281/0x4800 drivers/net/bonding/bond_main.c:1823
       do_set_master net/core/rtnetlink.c:2468 [inline]
       do_set_master+0x1d7/0x230 net/core/rtnetlink.c:2441
       __rtnl_newlink+0x11d4/0x1590 net/core/rtnetlink.c:3346
       rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3377
       rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5436
       netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2478
       netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
       netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329
       netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918
       sock_sendmsg_nosec net/socket.c:652 [inline]
       sock_sendmsg+0xcf/0x120 net/socket.c:672
       ____sys_sendmsg+0x6b9/0x7d0 net/socket.c:2343
       ___sys_sendmsg+0x100/0x170 net/socket.c:2397
       __sys_sendmsg+0xec/0x1b0 net/socket.c:2430
       do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:294
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(rtnl_mutex);
                               lock(lock#3);
                               lock(rtnl_mutex);
  lock(lock#3);

 *** DEADLOCK ***

1 lock held by syz-executor010/10258:
 #0: ffffffff8a34eb80 (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8a34eb80 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5433

stack backtrace:
CPU: 1 PID: 10258 Comm: syz-executor010 Not tainted 5.6.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x188/0x20d lib/dump_stack.c:118
 check_noncircular+0x32e/0x3e0 kernel/locking/lockdep.c:1808
 check_prev_add kernel/locking/lockdep.c:2475 [inline]
 check_prevs_add kernel/locking/lockdep.c:2580 [inline]
 validate_chain kernel/locking/lockdep.c:2970 [inline]
 __lock_acquire+0x201b/0x3ca0 kernel/locking/lockdep.c:3954
 lock_acquire+0x197/0x420 kernel/locking/lockdep.c:4484
 __mutex_lock_common kernel/locking/mutex.c:956 [inline]
 __mutex_lock+0x156/0x13c0 kernel/locking/mutex.c:1103
 cma_netdev_callback+0xc5/0x380 drivers/infiniband/core/cma.c:4612
 notifier_call_chain+0xc0/0x230 kernel/notifier.c:83
 call_netdevice_notifiers_info net/core/dev.c:1948 [inline]
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1933
 call_netdevice_notifiers_extack net/core/dev.c:1960 [inline]
 call_netdevice_notifiers+0x79/0xa0 net/core/dev.c:1974
 bond_change_active_slave+0x80e/0x1d90 drivers/net/bonding/bond_main.c:944
 bond_select_active_slave+0x250/0xa60 drivers/net/bonding/bond_main.c:986
 bond_enslave+0x4281/0x4800 drivers/net/bonding/bond_main.c:1823
 do_set_master net/core/rtnetlink.c:2468 [inline]
 do_set_master+0x1d7/0x230 net/core/rtnetlink.c:2441
 __rtnl_newlink+0x11d4/0x1590 net/core/rtnetlink.c:3346
 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3377
 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5436
 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2478
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6b9/0x7d0 net/socket.c:2343
 ___sys_sendmsg+0x100/0x170 net/socket.c:2397
 __sys_sendmsg+0xec/0x1b0 net/socket.c:2430
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440529
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffcca488538 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440529
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000004
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: