====================================================== [ INFO: possible circular locking dependency detected ] 4.9.109-ga4230be #48 Not tainted ------------------------------------------------------- syz-executor7/10742 is trying to acquire lock: (sk_lock-AF_INET){+.+.+.}, at: [] lock_sock include/net/sock.h:1404 [inline] (sk_lock-AF_INET){+.+.+.}, at: [] inet_bind+0x2a6/0x8b0 net/ipv4/af_inet.c:502 but task is already holding lock: (rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 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 __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 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 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+0x90f/0xbb0 net/netfilter/ipvs/ip_vs_ctl.c:2396 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 ipv6_setsockopt+0x10a/0x130 net/ipv6/ipv6_sockglue.c:901 tcp_setsockopt+0x88/0xe0 net/ipv4/tcp.c:2758 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 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(rtnl_mutex); lock(sk_lock-AF_INET); lock(rtnl_mutex); lock(sk_lock-AF_INET); *** DEADLOCK *** 2 locks held by syz-executor7/10742: #0: (rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 #1: (ipvs->sync_mutex){+.+.+.}, at: [] start_sync_thread+0x118/0x1e80 net/netfilter/ipvs/ip_vs_sync.c:1779 stack backtrace: CPU: 0 PID: 10742 Comm: syz-executor7 Not tainted 4.9.109-ga4230be #48 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801da3374f8 ffffffff81eb3e29 ffffffff855e7ec0 ffffffff8559d0a0 ffffffff855e7ec0 ffff8801ca7d08e8 ffff8801ca7d0000 ffff8801da337540 ffffffff814262d4 0000000000000001 00000000ca7d0000 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 [] 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+0x90f/0xbb0 net/netfilter/ipvs/ip_vs_ctl.c:2396 [] 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 [] ipv6_setsockopt+0x10a/0x130 net/ipv6/ipv6_sockglue.c:901 [] tcp_setsockopt+0x88/0xe0 net/ipv4/tcp.c:2758 [] 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 IPVS: sync thread started: state = BACKUP, mcast_ifn = veth1_to_bond, syncid = 0, id = 0 IPVS: stopping backup sync thread 10750 ... IPVS: Creating netns size=2536 id=20 IPVS: sync thread started: state = BACKUP, mcast_ifn = veth1_to_bond, syncid = 0, id = 0 IPVS: Creating netns size=2536 id=21 IPVS: stopping backup sync thread 10758 ... IPVS: stopping backup sync thread 10801 ... IPVS: sync thread started: state = BACKUP, mcast_ifn = veth1_to_bond, syncid = 0, id = 0 EXT4-fs (loop6): Unrecognized mount option "Gr" or missing value EXT4-fs (loop6): Unrecognized mount option "Gr" or missing value IPVS: Creating netns size=2536 id=22 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 blk_update_request: I/O error, dev loop0, sector 0 buffer_io_error: 746 callbacks suppressed Buffer I/O error on dev loop0, logical block 0, lost async page write blk_update_request: I/O error, dev loop0, sector 8 Buffer I/O error on dev loop0, logical block 1, lost async page write blk_update_request: I/O error, dev loop0, sector 16 Buffer I/O error on dev loop0, logical block 2, lost async page write blk_update_request: I/O error, dev loop0, sector 24 Buffer I/O error on dev loop0, logical block 3, lost async page write blk_update_request: I/O error, dev loop0, sector 32 Buffer I/O error on dev loop0, logical block 4, lost async page write blk_update_request: I/O error, dev loop0, sector 40 Buffer I/O error on dev loop0, logical block 5, lost async page write blk_update_request: I/O error, dev loop0, sector 48 Buffer I/O error on dev loop0, logical block 6, lost async page write blk_update_request: I/O error, dev loop0, sector 56 Buffer I/O error on dev loop0, logical block 7, lost async page write blk_update_request: I/O error, dev loop0, sector 64 Buffer I/O error on dev loop0, logical block 8, lost async page write Buffer I/O error on dev loop0, logical block 9, lost async page write IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready IPVS: Creating netns size=2536 id=23 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_UP): bridge_slave_0: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready IPVS: Creating netns size=2536 id=24 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 blk_update_request: 121 callbacks suppressed blk_update_request: I/O error, dev loop0, sector 0 blk_update_request: I/O error, dev loop0, sector 8 blk_update_request: I/O error, dev loop0, sector 16 blk_update_request: I/O error, dev loop0, sector 24 blk_update_request: I/O error, dev loop0, sector 32 blk_update_request: I/O error, dev loop0, sector 40 blk_update_request: I/O error, dev loop0, sector 48 blk_update_request: I/O error, dev loop0, sector 56 blk_update_request: I/O error, dev loop0, sector 64 blk_update_request: I/O error, dev loop0, sector 72 FAT-fs (loop6): Unrecognized mount option "E-l SEPa'zm2!EoɅZw[VWN- Tj;OI"laӢOi&o^-edN<'=" or missing value netlink: 44 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 44 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 17 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 17 bytes leftover after parsing attributes in process `syz-executor1'. FAT-fs (loop6): Unrecognized mount option "dosRxfloppy" or missing value netlink: 17 bytes leftover after parsing attributes in process `syz-executor1'. FAT-fs (loop6): bogus number of reserved sectors FAT-fs (loop6): Can't find a valid FAT filesystem netlink: 17 bytes leftover after parsing attributes in process `syz-executor1'. FAT-fs (loop6): Unrecognized mount option "dosRxfloppy" or missing value FAT-fs (loop6): Unrecognized mount option "" or missing value