[ 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: [<ffffffff832f48fb>] lock_sock include/net/sock.h:1404 [inline]
(sk_lock-AF_INET){+.+.+.}, at: [<ffffffff832f48fb>] set_mcast_if net/netfilter/ipvs/ip_vs_sync.c:1370 [inline]
(sk_lock-AF_INET){+.+.+.}, at: [<ffffffff832f48fb>] make_send_sock net/netfilter/ipvs/ip_vs_sync.c:1490 [inline]
(sk_lock-AF_INET){+.+.+.}, at: [<ffffffff832f48fb>] start_sync_thread+0x88b/0x1e80 net/netfilter/ipvs/ip_vs_sync.c:1885
but task is already holding lock:
(rtnl_mutex){+.+.+.}, at: [<ffffffff830b3937>] 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: [<ffffffff830b3937>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
#1: (ipvs->sync_mutex){+.+.+.}, at: [<ffffffff832f4188>] 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:
[<ffffffff81eb2329>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81eb2329>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
[<ffffffff814262d4>] print_circular_bug.cold.51+0x1bd/0x27d kernel/locking/lockdep.c:1202
[<ffffffff81239179>] check_prev_add kernel/locking/lockdep.c:1828 [inline]
[<ffffffff81239179>] check_prevs_add kernel/locking/lockdep.c:1938 [inline]
[<ffffffff81239179>] validate_chain kernel/locking/lockdep.c:2265 [inline]
[<ffffffff81239179>] __lock_acquire+0x3019/0x4070 kernel/locking/lockdep.c:3345
[<ffffffff8123ac40>] lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
[<ffffffff830226a6>] lock_sock_nested+0xc6/0x120 net/core/sock.c:2511
[<ffffffff832f48fb>] lock_sock include/net/sock.h:1404 [inline]
[<ffffffff832f48fb>] set_mcast_if net/netfilter/ipvs/ip_vs_sync.c:1370 [inline]
[<ffffffff832f48fb>] make_send_sock net/netfilter/ipvs/ip_vs_sync.c:1490 [inline]
[<ffffffff832f48fb>] start_sync_thread+0x88b/0x1e80 net/netfilter/ipvs/ip_vs_sync.c:1885
[<ffffffff832e1d48>] do_ip_vs_set_ctl+0x7c8/0xc00 net/netfilter/ipvs/ip_vs_ctl.c:2398
[<ffffffff831dcf3d>] nf_sockopt net/netfilter/nf_sockopt.c:105 [inline]
[<ffffffff831dcf3d>] nf_setsockopt+0x6d/0xc0 net/netfilter/nf_sockopt.c:114
[<ffffffff8334717a>] ip_setsockopt+0x9a/0xb0 net/ipv4/ip_sockglue.c:1247
[<ffffffff833f5d0a>] udp_setsockopt+0x4a/0x90 net/ipv4/udp.c:2091
[<ffffffff8301b75a>] sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:2706
[<ffffffff83018516>] SYSC_setsockopt net/socket.c:1772 [inline]
[<ffffffff83018516>] SyS_setsockopt+0x166/0x260 net/socket.c:1751
[<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
[<ffffffff839f7cd3>] 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��'���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