====================================================== [ INFO: possible circular locking dependency detected ] 4.9.111-g03c70fe #6 Not tainted ------------------------------------------------------- syz-executor6/8017 is trying to acquire lock: (rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 but task is already holding lock: (sk_lock-AF_INET){+.+.+.}, at: [] lock_sock include/net/sock.h:1404 [inline] (sk_lock-AF_INET){+.+.+.}, at: [] do_ip_setsockopt.isra.13+0x269/0x2b10 net/ipv4/ip_sockglue.c:636 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756 lock_sock_nested+0xc6/0x120 net/core/sock.c:2511 lock_sock include/net/sock.h:1404 [inline] inet_bind+0x2a6/0x8b0 net/ipv4/af_inet.c:502 make_receive_sock net/netfilter/ipvs/ip_vs_sync.c:1555 [inline] start_sync_thread+0x1356/0x1e80 net/netfilter/ipvs/ip_vs_sync.c:1887 do_ip_vs_set_ctl+0x7c8/0xc00 net/netfilter/ipvs/ip_vs_ctl.c:2398 nf_sockopt net/netfilter/nf_sockopt.c:105 [inline] nf_setsockopt+0x6d/0xc0 net/netfilter/nf_sockopt.c:114 ip_setsockopt+0x9a/0xb0 net/ipv4/ip_sockglue.c:1247 udp_setsockopt+0x4a/0x90 net/ipv4/udp.c:2091 IPVS: length: 212 != 8 sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:2706 IPVS: length: 212 != 8 SYSC_setsockopt net/socket.c:1772 [inline] SyS_setsockopt+0x166/0x260 net/socket.c:1751 do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 entry_SYSCALL_64_after_swapgs+0x5d/0xdb check_prev_add kernel/locking/lockdep.c:1828 [inline] check_prevs_add kernel/locking/lockdep.c:1938 [inline] validate_chain kernel/locking/lockdep.c:2265 [inline] __lock_acquire+0x3019/0x4070 kernel/locking/lockdep.c:3345 lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756 __mutex_lock_common kernel/locking/mutex.c:521 [inline] mutex_lock_nested+0xc0/0x870 kernel/locking/mutex.c:621 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 mrtsock_destruct+0x3b/0x1e0 net/ipv4/ipmr.c:1231 netlink: 76 bytes leftover after parsing attributes in process `syz-executor0'. ip_ra_control+0x2c2/0x420 net/ipv4/ip_sockglue.c:360 netlink: 76 bytes leftover after parsing attributes in process `syz-executor0'. do_ip_setsockopt.isra.13+0x15ff/0x2b10 net/ipv4/ip_sockglue.c:1137 ip_setsockopt+0x3a/0xb0 net/ipv4/ip_sockglue.c:1240 raw_setsockopt+0xb7/0xd0 net/ipv4/raw.c:833 sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:2706 SYSC_setsockopt net/socket.c:1772 [inline] SyS_setsockopt+0x166/0x260 net/socket.c:1751 netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'. do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 entry_SYSCALL_64_after_swapgs+0x5d/0xdb other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'. ---- ---- netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'. lock(sk_lock-AF_INET[ 158.171003] netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'. ); lock(rtnl_mutex); lock(sk_lock-AF_INET); lock(rtnl_mutex); *** DEADLOCK *** 1 lock held by syz-executor6/8017: #0: (sk_lock-AF_INET){+.+.+.}, at: [] lock_sock include/net/sock.h:1404 [inline] #0: (sk_lock-AF_INET){+.+.+.}, at: [] do_ip_setsockopt.isra.13+0x269/0x2b10 net/ipv4/ip_sockglue.c:636 stack backtrace: CPU: 0 PID: 8017 Comm: syz-executor6 Not tainted 4.9.111-g03c70fe #6 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff88019b5f75f8 ffffffff81eb2729 ffffffff8559cef0 ffffffff855e7800 ffffffff8559cef0 ffff8801b64868e8 ffff8801b6486000 ffff88019b5f7640 ffffffff814263a4 0000000000000001 00000000b6486000 0000000000000001 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_circular_bug.cold.51+0x1bd/0x27d kernel/locking/lockdep.c:1202 [] check_prev_add kernel/locking/lockdep.c:1828 [inline] [] check_prevs_add kernel/locking/lockdep.c:1938 [inline] [] validate_chain kernel/locking/lockdep.c:2265 [inline] [] __lock_acquire+0x3019/0x4070 kernel/locking/lockdep.c:3345 [] lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756 [] __mutex_lock_common kernel/locking/mutex.c:521 [inline] [] mutex_lock_nested+0xc0/0x870 kernel/locking/mutex.c:621 [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 [] mrtsock_destruct+0x3b/0x1e0 net/ipv4/ipmr.c:1231 [] ip_ra_control+0x2c2/0x420 net/ipv4/ip_sockglue.c:360 [] do_ip_setsockopt.isra.13+0x15ff/0x2b10 net/ipv4/ip_sockglue.c:1137 [] ip_setsockopt+0x3a/0xb0 net/ipv4/ip_sockglue.c:1240 [] raw_setsockopt+0xb7/0xd0 net/ipv4/raw.c:833 [] sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:2706 [] SYSC_setsockopt net/socket.c:1772 [inline] [] SyS_setsockopt+0x166/0x260 net/socket.c:1751 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor3'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=1025 sclass=netlink_route_socket pig=8117 comm=syz-executor0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=1025 sclass=netlink_route_socket pig=8120 comm=syz-executor0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=1025 sclass=netlink_route_socket pig=8134 comm=syz-executor0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=1025 sclass=netlink_route_socket pig=8194 comm=syz-executor3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=1025 sclass=netlink_route_socket pig=8213 comm=syz-executor3 IPVS: Creating netns size=2536 id=10 IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready SELinux: unrecognized netlink message: protocol=0 nlmsg_type=1025 sclass=netlink_route_socket pig=8631 comm=syz-executor3