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 ====================================================== [ INFO: possible circular locking dependency detected ] 4.9.109-g7cecc75 #2 Not tainted ------------------------------------------------------- syz-executor3/9952 is trying to acquire lock: (sk_lock-AF_INET){+.+.+.}, at: [] lock_sock include/net/sock.h:1404 [inline] (sk_lock-AF_INET){+.+.+.}, at: [] do_ip_setsockopt.isra.13+0x12a/0x2b10 net/ipv4/ip_sockglue.c:636 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] do_ip_setsockopt.isra.13+0x12a/0x2b10 net/ipv4/ip_sockglue.c:636 ip_setsockopt+0x3a/0xb0 net/ipv4/ip_sockglue.c:1240 udp_setsockopt+0x4a/0x90 net/ipv4/udp.c:2091 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 *** 1 lock held by syz-executor3/9952: #0: (rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70 stack backtrace: CPU: 0 PID: 9952 Comm: syz-executor3 Not tainted 4.9.109-g7cecc75 #2 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff88016d9e7758 ffffffff81eb3e29 ffffffff855e7650 ffffffff8559cef0 ffffffff855e7650 ffff88016dc9b8e8 ffff88016dc9b000 ffff88016d9e77a0 ffffffff814262d4 0000000000000001 000000006dc9b000 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] [] do_ip_setsockopt.isra.13+0x12a/0x2b10 net/ipv4/ip_sockglue.c:636 [] ip_setsockopt+0x3a/0xb0 net/ipv4/ip_sockglue.c:1240 [] udp_setsockopt+0x4a/0x90 net/ipv4/udp.c:2091 [] 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 l2tp_core: tunl 4: closing all sessions... l2tp_core: tunl 4: closing all sessions... l2tp_core: tunl 4: closing... l2tp_core: tunl 4: closing all sessions... l2tp_core: tunl 4: free... FAT-fs (loop4): error, invalid access to FAT (entry 0x00000207) FAT-fs (loop4): Filesystem has been set read-only FAT-fs (loop4): error, invalid access to FAT (entry 0x00000207) FAT-fs (loop4): error, invalid access to FAT (entry 0x00000207) FAT-fs (loop4): error, invalid access to FAT (entry 0x00000207) FAT-fs (loop4): error, invalid access to FAT (entry 0x00000207) FAT-fs (loop4): error, invalid access to FAT (entry 0x00000207) SELinux: unrecognized netlink message: protocol=0 nlmsg_type=20449 sclass=netlink_route_socket pig=10067 comm=syz-executor2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=20449 sclass=netlink_route_socket pig=10067 comm=syz-executor2 FAT-fs (loop4): error, fat_free: invalid cluster chain (i_pos 1041) FAT-fs (loop4): Filesystem has been set read-only IPVS: Creating netns size=2536 id=19 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 blk_update_request: 126 callbacks suppressed blk_update_request: I/O error, dev loop0, sector 0 buffer_io_error: 120 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 blk_update_request: I/O error, dev loop0, sector 72 Buffer I/O error on dev loop0, logical block 9, lost async page write SELinux: unrecognized netlink message: protocol=0 nlmsg_type=5773 sclass=netlink_route_socket pig=10544 comm=syz-executor7 IPVS: set_ctl: invalid protocol: 1 172.20.20.187:20004 lc IPVS: set_ctl: invalid protocol: 1 172.20.20.187:20004 lc FAT-fs (loop0): bogus number of reserved sectors FAT-fs (loop0): This doesn't look like a DOS 1.x volume; no bootstrapping code FAT-fs (loop0): Can't find a valid FAT filesystem FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop5): error, fat_get_cluster: invalid cluster chain (i_pos 1) FAT-fs (loop5): Filesystem has been set read-only FAT-fs (loop0): bogus number of reserved sectors FAT-fs (loop0): This doesn't look like a DOS 1.x volume; no bootstrapping code FAT-fs (loop0): Can't find a valid FAT filesystem device lo entered promiscuous mode device lo left promiscuous mode device lo entered promiscuous mode device lo left promiscuous mode binder: 10776:10780 BC_REQUEST_DEATH_NOTIFICATION invalid ref 0 binder: 10776:10780 BC_REQUEST_DEATH_NOTIFICATION invalid ref 15 binder: 10776:10780 transaction failed 29189/-22, size 0-0 line 3018 binder: 10776:10796 BC_REQUEST_DEATH_NOTIFICATION invalid ref 0 binder: 10776:10796 BC_REQUEST_DEATH_NOTIFICATION invalid ref 15 binder: 10776:10796 transaction failed 29189/-22, size 0-0 line 3018 binder: undelivered TRANSACTION_ERROR: 29189 binder: undelivered TRANSACTION_ERROR: 29189