======================================================
WARNING: possible circular locking dependency detected
4.14.215-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.3/10147 is trying to acquire lock:
(&table[i].mutex){+.+.}, at: [<ffffffff860b603d>] nf_tables_netdev_event+0x10d/0x4d0 net/netfilter/nf_tables_netdev.c:122
but task is already holding lock:
(rtnl_mutex){+.+.}, at: [<ffffffff83e162c4>] tun_detach drivers/net/tun.c:585 [inline]
(rtnl_mutex){+.+.}, at: [<ffffffff83e162c4>] tun_chr_close+0x34/0x60 drivers/net/tun.c:2679
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (rtnl_mutex){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
unregister_netdevice_notifier+0x5e/0x2b0 net/core/dev.c:1630
tee_tg_destroy+0x5c/0xb0 net/netfilter/xt_TEE.c:123
cleanup_entry+0x232/0x310 net/ipv6/netfilter/ip6_tables.c:684
__do_replace+0x38d/0x580 net/ipv6/netfilter/ip6_tables.c:1105
do_replace net/ipv6/netfilter/ip6_tables.c:1161 [inline]
do_ip6t_set_ctl+0x256/0x3a4 net/ipv6/netfilter/ip6_tables.c:1685
nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
nf_setsockopt+0x5f/0xb0 net/netfilter/nf_sockopt.c:115
ipv6_setsockopt+0xc0/0x120 net/ipv6/ipv6_sockglue.c:937
tcp_setsockopt+0x7b/0xc0 net/ipv4/tcp.c:2828
SYSC_setsockopt net/socket.c:1865 [inline]
SyS_setsockopt+0x110/0x1e0 net/socket.c:1844
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
-> #1 (&xt[i].mutex){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
xt_find_revision+0x88/0x200 net/netfilter/x_tables.c:373
nfnl_compat_get+0x1f7/0x870 net/netfilter/nft_compat.c:678
nfnetlink_rcv_msg+0x9bb/0xc00 net/netfilter/nfnetlink.c:214
netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2433
nfnetlink_rcv+0x1ab/0x1da0 net/netfilter/nfnetlink.c:515
netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline]
netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1313
netlink_sendmsg+0x62e/0xb80 net/netlink/af_netlink.c:1878
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xb5/0x100 net/socket.c:656
___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
__sys_sendmsg+0xa3/0x120 net/socket.c:2096
SYSC_sendmsg net/socket.c:2107 [inline]
SyS_sendmsg+0x27/0x40 net/socket.c:2103
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
-> #0 (&table[i].mutex){+.+.}:
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
nf_tables_netdev_event+0x10d/0x4d0 net/netfilter/nf_tables_netdev.c:122
notifier_call_chain+0x108/0x1a0 kernel/notifier.c:93
call_netdevice_notifiers_info net/core/dev.c:1667 [inline]
call_netdevice_notifiers net/core/dev.c:1683 [inline]
rollback_registered_many+0x765/0xba0 net/core/dev.c:7203
rollback_registered+0xca/0x170 net/core/dev.c:7245
audit: type=1804 audit(1610883396.401:3): pid=10179 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir571206824/syzkaller.ScdtKv/22/cgroup.controllers" dev="sda1" ino=15872 res=1
unregister_netdevice_queue+0x1b4/0x360 net/core/dev.c:8266
unregister_netdevice include/linux/netdevice.h:2442 [inline]
__tun_detach+0xca2/0xf60 drivers/net/tun.c:576
tun_detach drivers/net/tun.c:586 [inline]
tun_chr_close+0x41/0x60 drivers/net/tun.c:2679
__fput+0x25f/0x7a0 fs/file_table.c:210
task_work_run+0x11f/0x190 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:191 [inline]
exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x46/0xbb
other info that might help us debug this:
Chain exists of:
&table[i].mutex --> &xt[i].mutex --> rtnl_mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(rtnl_mutex);
lock(&xt[i].mutex);
lock(rtnl_mutex);
lock(&table[i].mutex);
*** DEADLOCK ***
1 lock held by syz-executor.3/10147:
#0: (rtnl_mutex){+.+.}, at: [<ffffffff83e162c4>] tun_detach drivers/net/tun.c:585 [inline]
#0: (rtnl_mutex){+.+.}, at: [<ffffffff83e162c4>] tun_chr_close+0x34/0x60 drivers/net/tun.c:2679
stack backtrace:
CPU: 0 PID: 10147 Comm: syz-executor.3 Not tainted 4.14.215-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x283 lib/dump_stack.c:58
print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258
check_prev_add kernel/locking/lockdep.c:1905 [inline]
check_prevs_add kernel/locking/lockdep.c:2022 [inline]
validate_chain kernel/locking/lockdep.c:2464 [inline]
__lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
nf_tables_netdev_event+0x10d/0x4d0 net/netfilter/nf_tables_netdev.c:122
notifier_call_chain+0x108/0x1a0 kernel/notifier.c:93
call_netdevice_notifiers_info net/core/dev.c:1667 [inline]
call_netdevice_notifiers net/core/dev.c:1683 [inline]
rollback_registered_many+0x765/0xba0 net/core/dev.c:7203
rollback_registered+0xca/0x170 net/core/dev.c:7245
unregister_netdevice_queue+0x1b4/0x360 net/core/dev.c:8266
unregister_netdevice include/linux/netdevice.h:2442 [inline]
__tun_detach+0xca2/0xf60 drivers/net/tun.c:576
tun_detach drivers/net/tun.c:586 [inline]
tun_chr_close+0x41/0x60 drivers/net/tun.c:2679
__fput+0x25f/0x7a0 fs/file_table.c:210
task_work_run+0x11f/0x190 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:191 [inline]
exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x417b71
RSP: 002b:00007ffe79d78430 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000417b71
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000004
RBP: 0000000000000001 R08: 00000000000010ef R09: 000000000fd7f0f3
R10: 00007ffe79d78510 R11: 0000000000000293 R12: 000000000119ca00
R13: 000000000119ca00 R14: 00000000000003e8 R15: 000000000119bf8c
XFS (loop4): Invalid superblock magic number
audit: type=1804 audit(1610883397.301:4): pid=10241 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir571206824/syzkaller.ScdtKv/23/cgroup.controllers" dev="sda1" ino=15893 res=1
XFS (loop4): Invalid superblock magic number
XFS (loop5): Invalid superblock magic number
audit: type=1804 audit(1610883397.721:5): pid=10312 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir571206824/syzkaller.ScdtKv/24/cgroup.controllers" dev="sda1" ino=15879 res=1
device vxlan0 entered promiscuous mode
XFS (loop5): Invalid superblock magic number
XFS (loop4): Invalid superblock magic number
XFS (loop5): Invalid superblock magic number
XFS (loop4): Invalid superblock magic number
FAT-fs (loop2): Directory bread(block 6) failed
FAT-fs (loop2): error, corrupted directory (invalid entries)
FAT-fs (loop2): Filesystem has been set read-only
md: could not open unknown-block(0,96).
md: md_import_device returned -6
FAT-fs (loop2): Directory bread(block 6) failed
FAT-fs (loop2): error, corrupted directory (invalid entries)
FAT-fs (loop2): Filesystem has been set read-only
md: could not open unknown-block(0,96).
md: md_import_device returned -6
FAT-fs (loop2): Directory bread(block 6) failed
FAT-fs (loop2): error, corrupted directory (invalid entries)
FAT-fs (loop2): Filesystem has been set read-only
audit: type=1804 audit(1610883401.771:6): pid=10657 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir465939943/syzkaller.fb1yVu/37/file1/bus" dev="loop3" ino=13 res=1
FAT-fs (loop2): Directory bread(block 6) failed
audit: type=1800 audit(1610883401.771:7): pid=10657 uid=0 auid=0 ses=4 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="bus" dev="loop3" ino=13 res=0
audit: type=1804 audit(1610883402.421:8): pid=10692 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir465939943/syzkaller.fb1yVu/37/file1/bus" dev="loop3" ino=13 res=1
audit: type=1800 audit(1610883402.431:9): pid=10692 uid=0 auid=0 ses=4 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="bus" dev="loop3" ino=13 res=0
audit: type=1804 audit(1610883402.761:10): pid=10706 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir953134893/syzkaller.oc2B4r/48/file1/bus" dev="loop5" ino=15 res=1
audit: type=1800 audit(1610883402.761:11): pid=10706 uid=0 auid=0 ses=4 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="bus" dev="loop5" ino=15 res=0
audit: type=1804 audit(1610883402.761:12): pid=10707 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir465939943/syzkaller.fb1yVu/38/file1/bus" dev="loop3" ino=14 res=1
audit: type=1800 audit(1610883402.761:13): pid=10707 uid=0 auid=0 ses=4 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="bus" dev="loop3" ino=14 res=0
audit: type=1804 audit(1610883403.641:14): pid=10757 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir683083802/syzkaller.oFhMOx/49/file1/bus" dev="loop4" ino=16 res=1
audit: type=1800 audit(1610883403.641:15): pid=10757 uid=0 auid=0 ses=4 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="loop4" ino=16 res=0
cannot load conntrack support for proto=2
cannot load conntrack support for proto=2
cannot load conntrack support for proto=2
cannot load conntrack support for proto=2
netlink: 36 bytes leftover after parsing attributes in process `syz-executor.1'.