===================================== WARNING: bad unlock balance detected! 6.15.0-rc1-syzkaller-00065-g3b07108ada81 #0 Not tainted ------------------------------------- syz.0.193/6669 is trying to release lock (&dev_instance_lock_key) at: [] netdev_unlock include/linux/netdevice.h:2756 [inline] [] netdev_unlock_ops include/net/netdev_lock.h:48 [inline] [] do_setlink.constprop.0+0x860/0x44f0 net/core/rtnetlink.c:3406 but there are no more locks to release! other info that might help us debug this: 1 lock held by syz.0.193/6669: #0: ffffffff9012bda8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #0: ffffffff9012bda8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #0: ffffffff9012bda8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4064 stack backtrace: CPU: 3 UID: 0 PID: 6669 Comm: syz.0.193 Not tainted 6.15.0-rc1-syzkaller-00065-g3b07108ada81 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_unlock_imbalance_bug kernel/locking/lockdep.c:5296 [inline] print_unlock_imbalance_bug+0x11b/0x130 kernel/locking/lockdep.c:5270 __lock_release kernel/locking/lockdep.c:5535 [inline] lock_release+0x242/0x2f0 kernel/locking/lockdep.c:5887 __mutex_unlock_slowpath+0xa2/0x6a0 kernel/locking/mutex.c:907 netdev_unlock include/linux/netdevice.h:2756 [inline] netdev_unlock_ops include/net/netdev_lock.h:48 [inline] do_setlink.constprop.0+0x860/0x44f0 net/core/rtnetlink.c:3406 rtnl_changelink net/core/rtnetlink.c:3769 [inline] __rtnl_newlink net/core/rtnetlink.c:3928 [inline] rtnl_newlink+0x1446/0x2000 net/core/rtnetlink.c:4065 rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6955 netlink_rcv_skb+0x16a/0x440 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] ____sys_sendmsg+0xa95/0xc70 net/socket.c:2566 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620 __sys_sendmsg+0x16d/0x220 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb582f8d169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb580df6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb5831a5fa0 RCX: 00007fb582f8d169 RDX: 0000000020008880 RSI: 0000200000000300 RDI: 0000000000000009 RBP: 00007fb58300e730 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb5831a5fa0 R15: 00007ffef6c5bdd8