[ INFO: possible circular locking dependency detected ] 4.9.110-g00a0bcb #4 Not tainted ------------------------------------------------------- syz-executor2/11250 is trying to acquire lock: (sk_lock-AF_INET){+.+.+.}, at: [] lock_sock include/net/sock.h:1404 [inline] (sk_lock-AF_INET){+.+.+.}, at: [] set_mcast_if net/netfilter/ipvs/ip_vs_sync.c:1370 [inline] (sk_lock-AF_INET){+.+.+.}, at: [] make_send_sock net/netfilter/ipvs/ip_vs_sync.c:1490 [inline] (sk_lock-AF_INET){+.+.+.}, at: [] start_sync_thread+0x88b/0x1e80 net/netfilter/ipvs/ip_vs_sync.c:1885 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: -> #1 (rtnl_mutex){+.+.+.}: 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 -> #0 (sk_lock-AF_INET){+.+.+.}: 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] set_mcast_if net/netfilter/ipvs/ip_vs_sync.c:1370 [inline] make_send_sock net/netfilter/ipvs/ip_vs_sync.c:1490 [inline] start_sync_thread+0x88b/0x1e80 net/netfilter/ipvs/ip_vs_sync.c:1885 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 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-executor2/11250: #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: 11250 Comm: syz-executor2 Not tainted 4.9.110-g00a0bcb #4 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801d41975a8 ffffffff81eb2329 ffffffff855e7b60 ffffffff8559d0a0 ffffffff855e7b60 ffff8801c777b8e8 ffff8801c777b000 ffff8801d41975f0 ffffffff814262d4 0000000000000001 00000000c777b000 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] [] set_mcast_if net/netfilter/ipvs/ip_vs_sync.c:1370 [inline] [] make_send_sock net/netfilter/ipvs/ip_vs_sync.c:1490 [inline] [] start_sync_thread+0x88b/0x1e80 net/netfilter/ipvs/ip_vs_sync.c:1885 [] 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 [] 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 = MASTER, mcast_ifn = syz_tun, syncid = 0, id = 0 IPVS: stopping master sync thread 11251 ... IPVS: sync thread started: state = MASTER, mcast_ifn = syz_tun, syncid = 0, id = 0 IPVS: stopping master sync thread 11253 ... 9pnet_virtio: no channels available for device ./file0 netlink: 4 bytes leftover after parsing attributes in process `syz-executor1'. IPVS: stopping master sync thread 11286 ... IPVS: sync thread started: state = MASTER, mcast_ifn = syz_tun, syncid = 0, id = 0 netlink: 4 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor1'. 9pnet_virtio: no channels available for device ./file0 9pnet_virtio: no channels available for device ./file0 9pnet_virtio: no channels available for device ./file0 IPVS: stopping master sync thread 11303 ... IPVS: stopping master sync thread 11316 ... IPVS: sync thread started: state = MASTER, mcast_ifn = syz_tun, syncid = 0, id = 0 9pnet_virtio: no channels available for device ./file0 9pnet_virtio: no channels available for device ./file0 IPVS: stopping master sync thread 11349 ... IPVS: sync thread started: state = MASTER, mcast_ifn = syz_tun, syncid = 0, id = 0 9pnet_virtio: no channels available for device ./file0 9pnet_virtio: no channels available for device ./file0 9pnet_virtio: no channels available for device ./file0 IPVS: stopping master sync thread 11393 ... 9pnet_virtio: no channels available for device ./file0 Dev loop2: unable to read RDB block 1 loop2: unable to read partition table loop2: partition table beyond EOD, truncated loop_reread_partitions: partition scan of loop2 () failed (rc=-5) Dev loop2: unable to read RDB block 1 loop2: unable to read partition table loop2: partition table beyond EOD, truncated loop_reread_partitions: partition scan of loop2 () failed (rc=-5) Dev loop2: unable to read RDB block 1 loop2: unable to read partition table loop2: partition table beyond EOD, truncated loop_reread_partitions: partition scan of loop2 () failed (rc=-5) Dev loop2: unable to read RDB block 1 loop2: unable to read partition table loop2: partition table beyond EOD, truncated loop_reread_partitions: partition scan of loop2 () failed (rc=-5) Dev loop2: unable to read RDB block 1 loop2: unable to read partition table loop2: partition table beyond EOD, truncated loop_reread_partitions: partition scan of loop2 () failed (rc=-5) BTRFS: device label d+Q§±'ç ñ¿¨S EXT2-fs (loop6): error: #blocks per group too big: 59392 devid 2530879793048935964 transid 756082810144684242 /dev/loop4 BTRFS error (device loop4): unsupported checksum algorithm 3786 BTRFS error (device loop4): superblock checksum mismatch BTRFS error (device loop4): open_ctree failed BTRFS error (device loop4): unsupported checksum algorithm 3786 BTRFS error (device loop4): superblock checksum mismatch EXT2-fs (loop6): error: #blocks per group too big: 59392 BTRFS error (device loop4): open_ctree failed EXT2-fs (loop6): error: #blocks per group too big: 59392 BTRFS error (device loop4): unsupported checksum algorithm 3786 BTRFS error (device loop4): superblock checksum mismatch BTRFS error (device loop4): open_ctree failed BTRFS error (device loop4): unsupported checksum algorithm 3786 BTRFS error (device loop4): superblock checksum mismatch BTRFS error (device loop4): open_ctree failed BTRFS error (device loop4): unsupported checksum algorithm 3786 BTRFS error (device loop4): superblock checksum mismatch BTRFS error (device loop4): open_ctree failed PM: Marking nosave pages: [mem 0x00000000-0x00000fff] PM: Marking nosave pages: [mem 0x0009f000-0x000fffff] PM: Marking nosave pages: [mem 0xbfff3000-0xffffffff] PM: Basic memory bitmaps created