======================================================
WARNING: possible circular locking dependency detected
4.14.263-syzkaller #0 Not tainted
------------------------------------------------------
kworker/u4:4/3080 is trying to acquire lock:
(&table[i].mutex){+.+.}, at: [<ffffffff85f039bd>] nf_tables_netdev_event+0x10d/0x4d0 net/netfilter/nf_tables_netdev.c:122
but task is already holding lock:
(rtnl_mutex){+.+.}, at: [<ffffffff864b36a0>] ip6gre_exit_net+0x70/0x570 net/ipv6/ip6_gre.c:1207
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:685
__do_replace+0x38d/0x580 net/ipv6/netfilter/ip6_tables.c:1106
do_replace net/ipv6/netfilter/ip6_tables.c:1162 [inline]
do_ip6t_set_ctl+0x256/0x3b0 net/ipv6/netfilter/ip6_tables.c:1688
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
target_revfn+0x43/0x210 net/netfilter/x_tables.c:354
xt_find_revision+0x15e/0x1d0 net/netfilter/x_tables.c:378
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:2446
nfnetlink_rcv+0x1ab/0x1da0 net/netfilter/nfnetlink.c:515
netlink_unicast_kernel net/netlink/af_netlink.c:1294 [inline]
netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1320
netlink_sendmsg+0x648/0xbc0 net/netlink/af_netlink.c:1891
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:7211
unregister_netdevice_many.part.0+0x18/0x2e0 net/core/dev.c:8293
unregister_netdevice_many+0x36/0x50 net/core/dev.c:8292
ip6gre_exit_net+0x41e/0x570 net/ipv6/ip6_gre.c:1209
ops_exit_list+0xad/0x160 net/core/net_namespace.c:142
cleanup_net+0x3b3/0x840 net/core/net_namespace.c:487
process_one_work+0x793/0x14a0 kernel/workqueue.c:2117
worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
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 ***
4 locks held by kworker/u4:4/3080:
#0: ("%s""netns"){+.+.}, at: [<ffffffff81364b80>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088
#1: (net_cleanup_work){+.+.}, at: [<ffffffff81364bb6>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092
#2: (net_mutex){+.+.}, at: [<ffffffff85c1dd80>] cleanup_net+0x110/0x840 net/core/net_namespace.c:453
#3: (rtnl_mutex){+.+.}, at: [<ffffffff864b36a0>] ip6gre_exit_net+0x70/0x570 net/ipv6/ip6_gre.c:1207
stack backtrace:
CPU: 1 PID: 3080 Comm: kworker/u4:4 Not tainted 4.14.263-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x281 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:7211
unregister_netdevice_many.part.0+0x18/0x2e0 net/core/dev.c:8293
unregister_netdevice_many+0x36/0x50 net/core/dev.c:8292
ip6gre_exit_net+0x41e/0x570 net/ipv6/ip6_gre.c:1209
ops_exit_list+0xad/0x160 net/core/net_namespace.c:142
cleanup_net+0x3b3/0x840 net/core/net_namespace.c:487
process_one_work+0x793/0x14a0 kernel/workqueue.c:2117
worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
netlink: 88 bytes leftover after parsing attributes in process `syz-executor.0'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.0'.
sit0: Invalid MTU 536871168 requested, hw max 65555
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.2'.
device team0 entered promiscuous mode
device team_slave_0 entered promiscuous mode
device team_slave_1 entered promiscuous mode
device team0 left promiscuous mode
device team_slave_0 left promiscuous mode
device team_slave_1 left promiscuous mode
could not allocate digest TFM handle hmac(hmac(sha1-ce))
UDF-fs: warning (device loop0): udf_load_vrs: No VRS found
UDF-fs: Scanning with blocksize 512 failed
EXT4-fs (loop5): unable to read superblock
UDF-fs: warning (device loop0): udf_load_vrs: No VRS found
UDF-fs: Scanning with blocksize 1024 failed
UDF-fs: warning (device loop0): udf_load_vrs: No VRS found
UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: warning (device loop0): udf_load_vrs: No VRS found
UDF-fs: Scanning with blocksize 4096 failed
XFS (loop4): Invalid device [./file0], error=-15
kauditd_printk_skb: 15 callbacks suppressed
audit: type=1400 audit(1643448480.194:5): apparmor="DENIED" operation="change_onexec" info="label not found" error=-2 profile="unconfined" name="&&s" pid=12655 comm="syz-executor.0"
EXT4-fs (loop5): unable to read superblock
print_req_error: I/O error, dev loop5, sector 0
Buffer I/O error on dev loop5, logical block 0, async page read
print_req_error: I/O error, dev loop5, sector 2
Buffer I/O error on dev loop5, logical block 1, async page read
EXT4-fs (loop5): unable to read superblock
print_req_error: I/O error, dev loop5, sector 0
Buffer I/O error on dev loop5, logical block 0, async page read
print_req_error: I/O error, dev loop5, sector 2
Buffer I/O error on dev loop5, logical block 1, async page read
EXT4-fs (loop5): unable to read superblock
QAT: Invalid ioctl
XFS (loop5): unknown mount option [biosize=00000000000000000009].
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.1'.
audit: type=1400 audit(1643448481.024:6): apparmor="DENIED" operation="change_onexec" info="label not found" error=-2 profile="unconfined" name=78667303 pid=12909 comm="syz-executor.2"
overlayfs: unrecognized mount option "xino=auto" or missing value
base_sock_release(ffff888042d9da80) sk=ffff88808de20d40
base_sock_release(ffff888041f1c4c0) sk=ffff8880a1dfacc0
overlayfs: fs on 'file0' does not support file handles, falling back to index=off.
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.1'.
bridge_slave_0: FDB only supports static addresses