RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 0000000000000004 R08: 0000000000000002 R09: 0000000000003231 R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff R13: 0000000000000006 R14: 0000000000000000 R15: 0000000000000000 ============================================ WARNING: possible recursive locking detected 4.14.171-syzkaller #0 Not tainted -------------------------------------------- syz-executor498/7375 is trying to acquire lock: (rtnl_mutex){+.+.}, at: [] hsr_dev_destroy+0x1b/0xb0 net/hsr/hsr_device.c:373 but task is already holding lock: (rtnl_mutex){+.+.}, at: [] rtnl_lock net/core/rtnetlink.c:72 [inline] (rtnl_mutex){+.+.}, at: [] rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4310 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(rtnl_mutex); lock(rtnl_mutex); *** DEADLOCK *** May be due to missing lock nesting notation 1 lock held by syz-executor498/7375: #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:4310 stack backtrace: CPU: 1 PID: 7375 Comm: syz-executor498 Not tainted 4.14.171-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+0x13e/0x194 lib/dump_stack.c:58 print_deadlock_bug kernel/locking/lockdep.c:1796 [inline] check_deadlock kernel/locking/lockdep.c:1843 [inline] validate_chain kernel/locking/lockdep.c:2444 [inline] __lock_acquire.cold+0x2bf/0x8dc kernel/locking/lockdep.c:3487 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3994 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893 hsr_dev_destroy+0x1b/0xb0 net/hsr/hsr_device.c:373 register_netdevice+0x793/0xc70 net/core/dev.c:7714 hsr_dev_finalize+0x57b/0x7fe net/hsr/hsr_device.c:492 hsr_newlink+0x248/0x330 net/hsr/hsr_netlink.c:72 rtnl_newlink+0xecb/0x1720 net/core/rtnetlink.c:2728 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4315 netlink_rcv_skb+0x127/0x370 net/netlink/af_netlink.c:2432 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline] netlink_unicast+0x437/0x620 net/netlink/af_netlink.c:1312 netlink_sendmsg+0x733/0xbe0 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xc5/0x100 net/socket.c:656 ___sys_sendmsg+0x70a/0x840 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+0x42/0xb7 RIP: 0033:0x4446a9 RSP: 002b:00007ffd8c71b7b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004446a9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 0000000000000004 R08: 0000000000000002 R09: 0000000000003231 R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff R13: 0000000000000006 R14: 0000000000000000 R15: 0000000000000000