Hello, syzbot found the following crash on: HEAD commit: 68e2c376 Merge branch 'hsr-several-code-cleanup-for-hsr-mo.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=10c92e91e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7e519c35f474a428 dashboard link: https://syzkaller.appspot.com/bug?extid=3fbea977bd382a4e6140 compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+3fbea977bd382a4e6140@xxxxxxxxxxxxxxxxxxxxxxxxx iwpm_register_pid: Unable to send a nlmsg (client = 2) ====================================================== WARNING: possible circular locking dependency detected 5.6.0-rc3-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.5/2139 is trying to acquire lock: ffffffff8a34e5c0 (rtnl_mutex){+.+.}, at: siw_create_listen+0x329/0xed0 drivers/infiniband/sw/siw/siw_cm.c:1951 but task is already holding lock: ffffffff8a1d3600 (lock#3){+.+.}, at: cma_add_one+0x5dc/0xb60 drivers/infiniband/core/cma.c:4663 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (lock#3){+.+.}: __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:4605 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:5440 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+0xf6/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (rtnl_mutex){+.+.}: 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 siw_create_listen+0x329/0xed0 drivers/infiniband/sw/siw/siw_cm.c:1951 iw_cm_listen+0x166/0x1e0 drivers/infiniband/core/iwcm.c:582 cma_iw_listen drivers/infiniband/core/cma.c:2450 [inline] rdma_listen+0x5e2/0x910 drivers/infiniband/core/cma.c:3614 cma_listen_on_dev+0x512/0x650 drivers/infiniband/core/cma.c:2501 cma_add_one+0x6aa/0xb60 drivers/infiniband/core/cma.c:4666 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+0xf6/0x790 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(lock#3); lock(rtnl_mutex); lock(lock#3); lock(rtnl_mutex); *** DEADLOCK *** 6 locks held by syz-executor.5/2139: #0: ffffffff8cf316c0 (&rdma_nl_types[idx].sem){.+.+}, at: rdma_nl_rcv_msg drivers/infiniband/core/netlink.c:164 [inline] #0: ffffffff8cf316c0 (&rdma_nl_types[idx].sem){.+.+}, at: rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline] #0: ffffffff8cf316c0 (&rdma_nl_types[idx].sem){.+.+}, at: rdma_nl_rcv+0x3ba/0x900 drivers/infiniband/core/netlink.c:259 #1: ffffffff8a1c8fc8 (link_ops_rwsem){++++}, at: nldev_newlink+0x23b/0x400 drivers/infiniband/core/nldev.c:1528 #2: ffffffff8a1bcae8 (devices_rwsem){++++}, at: enable_device_and_get+0xfc/0x3b0 drivers/infiniband/core/device.c:1306 #3: ffffffff8a1bc9a8 (clients_rwsem){++++}, at: enable_device_and_get+0x15b/0x3b0 drivers/infiniband/core/device.c:1314 #4: ffff8880550d8538 (&device->client_data_rwsem){++++}, at: add_client_context+0x382/0x520 drivers/infiniband/core/device.c:679 #5: ffffffff8a1d3600 (lock#3){+.+.}, at: cma_add_one+0x5dc/0xb60 drivers/infiniband/core/cma.c:4663 stack backtrace: CPU: 0 PID: 2139 Comm: syz-executor.5 Not tainted 5.6.0-rc3-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 siw_create_listen+0x329/0xed0 drivers/infiniband/sw/siw/siw_cm.c:1951 iw_cm_listen+0x166/0x1e0 drivers/infiniband/core/iwcm.c:582 cma_iw_listen drivers/infiniband/core/cma.c:2450 [inline] rdma_listen+0x5e2/0x910 drivers/infiniband/core/cma.c:3614 cma_listen_on_dev+0x512/0x650 drivers/infiniband/core/cma.c:2501 cma_add_one+0x6aa/0xb60 drivers/infiniband/core/cma.c:4666 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+0xf6/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c4a9 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f9634c65c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f9634c666d4 RCX: 000000000045c4a9 RDX: 0000000000000000 RSI: 00000000200031c0 RDI: 0000000000000003 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000009a3 R14: 00000000004d5798 R15: 000000000076bf2c infiniband syz1: RDMA CMA: cma_listen_on_dev, error -22 infiniband syz1: RDMA CMA: cma_listen_on_dev, error -98 --- This bug is generated by a bot. 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