IPVS: sync thread started: state = MASTER, mcast_ifn = gre0, syncid = 0, id = 0 IPVS: stopping master sync thread 6567 ... kernel msg: ebtables bug: please report to author: bad policy ====================================================== WARNING: possible circular locking dependency detected 4.17.0-rc2+ #24 Not tainted ------------------------------------------------------ syz-executor1/6576 is trying to acquire lock: (ptrval) (&mm->mmap_sem){++++}, at: __might_fault+0xfb/0x1e0 mm/memory.c:4554 but task is already holding lock: (ptrval) (sk_lock-AF_INET6){+.+.}, at: lock_sock include/net/sock.h:1469 [inline] (ptrval) (sk_lock-AF_INET6){+.+.}, at: sctp_setsockopt+0x33e/0x6b00 net/sctp/socket.c:4211 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (sk_lock-AF_INET6){+.+.}: lock_sock_nested+0xd0/0x120 net/core/sock.c:2844 lock_sock include/net/sock.h:1469 [inline] tcp_mmap+0x1c7/0x14f0 net/ipv4/tcp.c:1759 sock_mmap+0x8e/0xc0 net/socket.c:1144 call_mmap include/linux/fs.h:1789 [inline] mmap_region+0xd13/0x1820 mm/mmap.c:1723 kernel msg: ebtables bug: please report to author: bad policy do_mmap+0xc79/0x11d0 mm/mmap.c:1494 do_mmap_pgoff include/linux/mm.h:2237 [inline] vm_mmap_pgoff+0x1fb/0x2a0 mm/util.c:357 ksys_mmap_pgoff+0x4c9/0x640 mm/mmap.c:1544 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline] __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe kernel msg: ebtables bug: please report to author: entries_size too small -> #0 (&mm->mmap_sem){++++}: lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 __might_fault+0x155/0x1e0 mm/memory.c:4555 kernel msg: ebtables bug: please report to author: entries_size too small _copy_from_user+0x30/0x150 lib/usercopy.c:10 copy_from_user include/linux/uaccess.h:147 [inline] sctp_setsockopt_default_send_param net/sctp/socket.c:2896 [inline] sctp_setsockopt+0xb14/0x6b00 net/sctp/socket.c:4267 sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:3042 __sys_setsockopt+0x1bd/0x390 net/socket.c:1903 __do_sys_setsockopt net/socket.c:1914 [inline] __se_sys_setsockopt net/socket.c:1911 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1911 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sk_lock-AF_INET6); lock(&mm->mmap_sem); lock(sk_lock-AF_INET6); lock(&mm->mmap_sem); *** DEADLOCK *** 1 lock held by syz-executor1/6576: #0: (ptrval) (sk_lock-AF_INET6){+.+.}, at: lock_sock include/net/sock.h:1469 [inline] #0: (ptrval) (sk_lock-AF_INET6){+.+.}, at: sctp_setsockopt+0x33e/0x6b00 net/sctp/socket.c:4211 stack backtrace: CPU: 0 PID: 6576 Comm: syz-executor1 Not tainted 4.17.0-rc2+ #24 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 print_circular_bug.isra.36.cold.54+0x1bd/0x27d kernel/locking/lockdep.c:1223 check_prev_add kernel/locking/lockdep.c:1863 [inline] check_prevs_add kernel/locking/lockdep.c:1976 [inline] validate_chain kernel/locking/lockdep.c:2417 [inline] __lock_acquire+0x343e/0x5140 kernel/locking/lockdep.c:3431 lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 __might_fault+0x155/0x1e0 mm/memory.c:4555 _copy_from_user+0x30/0x150 lib/usercopy.c:10 copy_from_user include/linux/uaccess.h:147 [inline] sctp_setsockopt_default_send_param net/sctp/socket.c:2896 [inline] sctp_setsockopt+0xb14/0x6b00 net/sctp/socket.c:4267 sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:3042 __sys_setsockopt+0x1bd/0x390 net/socket.c:1903 __do_sys_setsockopt net/socket.c:1914 [inline] __se_sys_setsockopt net/socket.c:1911 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1911 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455979 RSP: 002b:00007f6eecc8ec68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f6eecc8f6d4 RCX: 0000000000455979 RDX: 000000000000000a RSI: 0000000000000084 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000020 R09: 0000000000000000 R10: 0000000020000200 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000005d2 R14: 00000000006fcc50 R15: 0000000000000000 IPv4: Oversized IP packet from 127.0.0.1 IPv4: Oversized IP packet from 127.0.0.1 xt_helper: cannot load conntrack support for proto=7 netlink: 192 bytes leftover after parsing attributes in process `syz-executor2'. xt_helper: cannot load conntrack support for proto=7 netlink: 192 bytes leftover after parsing attributes in process `syz-executor2'. IPVS: set_ctl: invalid protocol: 59 224.0.0.2:20000 lc IPVS: set_ctl: invalid protocol: 59 224.0.0.2:20000 lc netlink: 'syz-executor4': attribute type 1 has an invalid length. netlink: 'syz-executor4': attribute type 1 has an invalid length. device bridge0 entered promiscuous mode syz-executor6 (6757) used greatest stack depth: 14504 bytes left device bridge0 left promiscuous mode device bridge0 entered promiscuous mode netlink: 'syz-executor2': attribute type 1 has an invalid length. device bridge0 left promiscuous mode netlink: 'syz-executor2': attribute type 1 has an invalid length. netlink: 'syz-executor2': attribute type 1 has an invalid length. netlink: 'syz-executor2': attribute type 1 has an invalid length. netlink: 'syz-executor2': attribute type 1 has an invalid length. netlink: 'syz-executor2': attribute type 1 has an invalid length. xt_ipvs: protocol family 7 not supported kernel msg: ebtables bug: please report to author: bad policy xt_ipvs: protocol family 7 not supported IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 bond0: Releasing backup interface bond_slave_1 netlink: 'syz-executor2': attribute type 1 has an invalid length. netlink: 4 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 'syz-executor2': attribute type 1 has an invalid length. netlink: 4 bytes leftover after parsing attributes in process `syz-executor5'. device bridge0 entered promiscuous mode device bridge0 left promiscuous mode device bridge0 entered promiscuous mode device bridge0 left promiscuous mode netlink: 192 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 192 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 192 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor7'.