======================================================
WARNING: possible circular locking dependency detected
5.12.0-rc4-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.3/11839 is trying to acquire lock:
ffffffff8d6704e8 (rtnl_mutex){+.+.}-{3:3}, at: ipv6_sock_mc_close+0xd7/0x120 net/ipv6/mcast.c:357
but task is already holding lock:
ffff8880626e1920 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1603 [inline]
ffff8880626e1920 (sk_lock-AF_INET6){+.+.}-{0:0}, at: mptcp6_release+0x57/0x130 net/mptcp/protocol.c:3540
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (sk_lock-AF_INET6){+.+.}-{0:0}:
lock_sock_nested+0xca/0x120 net/core/sock.c:3071
lock_sock include/net/sock.h:1603 [inline]
sock_set_reuseaddr+0x13/0x60 net/core/sock.c:716
siw_create_listen+0x1a3/0x1050 drivers/infiniband/sw/siw/siw_cm.c:1775
iw_cm_listen+0x167/0x1f0 drivers/infiniband/core/iwcm.c:584
cma_iw_listen drivers/infiniband/core/cma.c:2482 [inline]
rdma_listen+0x6df/0xe00 drivers/infiniband/core/cma.c:3743
cma_listen_on_dev+0x4b7/0x770 drivers/infiniband/core/cma.c:2538
cma_add_one+0x670/0xcf0 drivers/infiniband/core/cma.c:4917
add_client_context+0x405/0x5e0 drivers/infiniband/core/device.c:717
enable_device_and_get+0x1cd/0x3b0 drivers/infiniband/core/device.c:1331
ib_register_device drivers/infiniband/core/device.c:1413 [inline]
ib_register_device+0x7c7/0xa50 drivers/infiniband/core/device.c:1365
siw_device_register drivers/infiniband/sw/siw/siw_main.c:72 [inline]
siw_newlink drivers/infiniband/sw/siw/siw_main.c:521 [inline]
siw_newlink+0xc0c/0x1120 drivers/infiniband/sw/siw/siw_main.c:498
nldev_newlink+0x30e/0x560 drivers/infiniband/core/nldev.c:1555
rdma_nl_rcv_msg+0x36d/0x690 drivers/infiniband/core/netlink.c:195
rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]
rdma_nl_rcv+0x2ee/0x430 drivers/infiniband/core/netlink.c:259
netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927
sock_sendmsg_nosec net/socket.c:654 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:674
____sys_sendmsg+0x6e8/0x810 net/socket.c:2350
___sys_sendmsg+0xf3/0x170 net/socket.c:2404
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2433
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #1 (lock#6){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:949 [inline]
__mutex_lock+0x139/0x1120 kernel/locking/mutex.c:1096
cma_init+0x20/0x128 drivers/infiniband/core/cma.c:4998
do_one_initcall+0x103/0x650 init/main.c:1226
do_initcall_level init/main.c:1299 [inline]
do_initcalls init/main.c:1315 [inline]
do_basic_setup init/main.c:1335 [inline]
kernel_init_freeable+0x63e/0x6c2 init/main.c:1537
kernel_init+0xd/0x1b8 init/main.c:1424
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
-> #0 (rtnl_mutex){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:2936 [inline]
check_prevs_add kernel/locking/lockdep.c:3059 [inline]
validate_chain kernel/locking/lockdep.c:3674 [inline]
__lock_acquire+0x2b14/0x54c0 kernel/locking/lockdep.c:4900
lock_acquire kernel/locking/lockdep.c:5510 [inline]
lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5475
__mutex_lock_common kernel/locking/mutex.c:949 [inline]
__mutex_lock+0x139/0x1120 kernel/locking/mutex.c:1096
ipv6_sock_mc_close+0xd7/0x120 net/ipv6/mcast.c:357
mptcp6_release+0xb9/0x130 net/mptcp/protocol.c:3548
__sock_release+0xcd/0x280 net/socket.c:599
sock_close+0x18/0x20 net/socket.c:1258
__fput+0x288/0x920 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:140
get_signal+0x1c89/0x2100 kernel/signal.c:2558
arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789
handle_signal_work kernel/entry/common.c:147 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x44/0xae
other info that might help us debug this:
Chain exists of:
rtnl_mutex --> lock#6 --> sk_lock-AF_INET6
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(sk_lock-AF_INET6);
lock(lock#6);
lock(sk_lock-AF_INET6);
lock(rtnl_mutex);
*** DEADLOCK ***
2 locks held by syz-executor.3/11839:
#0: ffff88823bd0ed50 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline]
#0: ffff88823bd0ed50 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: __sock_release+0x86/0x280 net/socket.c:598
#1: ffff8880626e1920 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1603 [inline]
#1: ffff8880626e1920 (sk_lock-AF_INET6){+.+.}-{0:0}, at: mptcp6_release+0x57/0x130 net/mptcp/protocol.c:3540
stack backtrace:
CPU: 1 PID: 11839 Comm: syz-executor.3 Not tainted 5.12.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x141/0x1d7 lib/dump_stack.c:120
check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2127
check_prev_add kernel/locking/lockdep.c:2936 [inline]
check_prevs_add kernel/locking/lockdep.c:3059 [inline]
validate_chain kernel/locking/lockdep.c:3674 [inline]
__lock_acquire+0x2b14/0x54c0 kernel/locking/lockdep.c:4900
lock_acquire kernel/locking/lockdep.c:5510 [inline]
lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5475
__mutex_lock_common kernel/locking/mutex.c:949 [inline]
__mutex_lock+0x139/0x1120 kernel/locking/mutex.c:1096
ipv6_sock_mc_close+0xd7/0x120 net/ipv6/mcast.c:357
mptcp6_release+0xb9/0x130 net/mptcp/protocol.c:3548
__sock_release+0xcd/0x280 net/socket.c:599
sock_close+0x18/0x20 net/socket.c:1258
__fput+0x288/0x920 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:140
get_signal+0x1c89/0x2100 kernel/signal.c:2558
arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789
handle_signal_work kernel/entry/common.c:147 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x466459
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3822ea9188 EFLAGS: 00000246 ORIG_RAX: 000000000000002d
RAX: 0000000000001fb3 RBX: 000000000056bf60 RCX: 0000000000466459
RDX: ffffffffffffff21 RSI: 0000000020000480 RDI: 0000000000000003
RBP: 00000000004bf9fb R08: 0000000000000000 R09: fffffffffffffe8c
R10: 0000000000000734 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffdb4deaa8f R14: 00007f3822ea9300 R15: 0000000000022000