Warning: Permanently added '10.128.0.159' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 83.785725][ T9311] [ 83.788134][ T9311] ===================================== [ 83.793653][ T9311] WARNING: bad unlock balance detected! [ 83.799169][ T9311] 5.5.0-rc5-syzkaller #0 Not tainted [ 83.804427][ T9311] ------------------------------------- [ 83.809964][ T9311] syz-executor496/9311 is trying to release lock (sk_lock-AF_INET6) at: [ 83.818289][ T9311] [] gtp_encap_enable_socket+0x146/0x400 [ 83.825462][ T9311] but there are no more locks to release! [ 83.831525][ T9311] [ 83.831525][ T9311] other info that might help us debug this: [ 83.839663][ T9311] 2 locks held by syz-executor496/9311: [ 83.845178][ T9311] #0: ffffffff8a4d8840 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x405/0xaf0 [ 83.854030][ T9311] #1: ffff88809a3420e0 (slock-AF_INET6){+...}, at: release_sock+0x20/0x1c0 [ 83.862697][ T9311] [ 83.862697][ T9311] stack backtrace: [ 83.868565][ T9311] CPU: 0 PID: 9311 Comm: syz-executor496 Not tainted 5.5.0-rc5-syzkaller #0 [ 83.877232][ T9311] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 83.887270][ T9311] Call Trace: [ 83.890539][ T9311] dump_stack+0x197/0x210 [ 83.894849][ T9311] ? gtp_encap_enable_socket+0x146/0x400 [ 83.902459][ T9311] print_unlock_imbalance_bug.cold+0x114/0x123 [ 83.908589][ T9311] ? gtp_encap_enable_socket+0x146/0x400 [ 83.914291][ T9311] lock_release+0x5f2/0x960 [ 83.918798][ T9311] ? __kasan_check_write+0x14/0x20 [ 83.923895][ T9311] ? lock_downgrade+0x920/0x920 [ 83.928732][ T9311] ? lock_acquire+0x190/0x410 [ 83.933408][ T9311] ? release_sock+0x20/0x1c0 [ 83.937988][ T9311] release_sock+0x17c/0x1c0 [ 83.942477][ T9311] gtp_encap_enable_socket+0x146/0x400 [ 83.947915][ T9311] ? gtp_find_pdp_by_link+0x480/0x480 [ 83.953269][ T9311] ? memset+0x32/0x40 [ 83.957267][ T9311] ? alloc_netdev_mqs+0xa22/0xde0 [ 83.962286][ T9311] gtp_newlink+0x9fc/0xc60 [ 83.966726][ T9311] ? rtnl_create_link+0x192/0xab0 [ 83.971726][ T9311] ? netlink_ns_capable+0x26/0x30 [ 83.976750][ T9311] ? gtp_genl_get_pdp+0x5c0/0x5c0 [ 83.981750][ T9311] __rtnl_newlink+0x109e/0x1790 [ 83.986584][ T9311] ? rtnl_link_unregister+0x250/0x250 [ 83.991943][ T9311] ? stack_depot_save+0x25a/0x450 [ 83.996953][ T9311] ? mark_held_locks+0xa4/0xf0 [ 84.001711][ T9311] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 84.007498][ T9311] ? stack_depot_save+0x25a/0x450 [ 84.012502][ T9311] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 84.018302][ T9311] ? lockdep_hardirqs_on+0x421/0x5e0 [ 84.023564][ T9311] ? trace_hardirqs_on+0x67/0x240 [ 84.028568][ T9311] ? _raw_spin_unlock_irqrestore+0x9f/0xe0 [ 84.034353][ T9311] ? stack_depot_save+0x25a/0x450 [ 84.039370][ T9311] ? save_stack+0x5c/0x90 [ 84.043675][ T9311] ? save_stack+0x23/0x90 [ 84.047993][ T9311] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 84.053876][ T9311] ? kasan_kmalloc+0x9/0x10 [ 84.058367][ T9311] ? kmem_cache_alloc_trace+0x158/0x790 [ 84.063915][ T9311] ? rtnl_newlink+0x4b/0xa0 [ 84.068413][ T9311] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 84.073969][ T9311] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 84.079940][ T9311] rtnl_newlink+0x69/0xa0 [ 84.084263][ T9311] ? __rtnl_newlink+0x1790/0x1790 [ 84.089800][ T9311] rtnetlink_rcv_msg+0x45e/0xaf0 [ 84.094718][ T9311] ? rtnl_bridge_getlink+0x910/0x910 [ 84.099981][ T9311] ? lock_downgrade+0x920/0x920 [ 84.104816][ T9311] ? netlink_deliver_tap+0x228/0xbe0 [ 84.110086][ T9311] ? find_held_lock+0x35/0x130 [ 84.114831][ T9311] netlink_rcv_skb+0x177/0x450 [ 84.119606][ T9311] ? rtnl_bridge_getlink+0x910/0x910 [ 84.124869][ T9311] ? netlink_ack+0xb50/0xb50 [ 84.129436][ T9311] ? __kasan_check_read+0x11/0x20 [ 84.134436][ T9311] ? netlink_deliver_tap+0x24a/0xbe0 [ 84.139714][ T9311] rtnetlink_rcv+0x1d/0x30 [ 84.144105][ T9311] netlink_unicast+0x58c/0x7d0 [ 84.148847][ T9311] ? netlink_attachskb+0x870/0x870 [ 84.153932][ T9311] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 84.159630][ T9311] ? __check_object_size+0x3d/0x437 [ 84.164814][ T9311] netlink_sendmsg+0x91c/0xea0 [ 84.169570][ T9311] ? netlink_unicast+0x7d0/0x7d0 [ 84.174497][ T9311] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 84.180035][ T9311] ? apparmor_socket_sendmsg+0x2a/0x30 [ 84.185474][ T9311] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 84.191691][ T9311] ? security_socket_sendmsg+0x8d/0xc0 [ 84.197123][ T9311] ? netlink_unicast+0x7d0/0x7d0 [ 84.202039][ T9311] sock_sendmsg+0xd7/0x130 [ 84.206430][ T9311] ____sys_sendmsg+0x753/0x880 [ 84.211180][ T9311] ? kernel_sendmsg+0x50/0x50 [ 84.215834][ T9311] ? find_held_lock+0x35/0x130 [ 84.220586][ T9311] ___sys_sendmsg+0x100/0x170 [ 84.225240][ T9311] ? sendmsg_copy_msghdr+0x70/0x70 [ 84.230329][ T9311] ? __kasan_check_read+0x11/0x20 [ 84.235327][ T9311] ? __fget+0x37f/0x550 [ 84.239461][ T9311] ? ksys_dup3+0x3e0/0x3e0 [ 84.243848][ T9311] ? __kasan_check_read+0x11/0x20 [ 84.248846][ T9311] ? mark_lock+0xc2/0x1220 [ 84.253238][ T9311] ? __fget_light+0x1a9/0x230 [ 84.257886][ T9311] ? __fdget+0x1b/0x20 [ 84.261939][ T9311] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 84.268167][ T9311] __sys_sendmsg+0x105/0x1d0 [ 84.274729][ T9311] ? __sys_sendmsg_sock+0xc0/0xc0 [ 84.279732][ T9311] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 84.285257][ T9311] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 84.290705][ T9311] ? do_fast_syscall_32+0xd1/0xe16 [ 84.295795][ T9311] ? entry_SYSENTER_compat+0x70/0x7f [ 84.301067][ T9311] ? do_fast_syscall_32+0xd1/0xe16 [ 84.306158][ T9311] __ia32_compat_sys_sendmsg+0x7a/0xb0 [ 84.311591][ T9311] do_fast_syscall_32+0x27b/0xe16 [ 84.316612][ T9311] entry_SYSENTER_compat+0x70/0x7f [ 84.321713][ T9311] RIP: 0023:0xf7f77a39 [ 84.325771][ T9311] Code: 00 00 00 89 d3 5b 5e 5f 5d c3 b8 80 96 98 00 eb c4 8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 84.345367][ T9311] RSP: 002b:00000000f7f521fc EFLAGS: 00000246 ORIG_RAX: 0000000000000172 [ 84.353759][ T9311] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000180 [ 84.361704][ T9311] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 84.369652][ T9311] RBP: 00000000003d0f00 R08: 0000000000000000 R09: 0000000000000000 [ 84.377602][ T9311] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 84.385548][ T9311] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000