======================================================
WARNING: possible circular locking dependency detected
5.15.175-syzkaller #0 Not tainted
------------------------------------------------------
syz.3.302/5386 is trying to acquire lock:
ffff88802b4b8120 (sk_lock-AF_INET6){+.+.}-{0:0}, at: inet_sk_diag_fill+0xf6a/0x1cb0 net/ipv4/inet_diag.c:342
but task is already holding lock:
ffffc900018bf588 (&h->lhash2[i].lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:363 [inline]
ffffc900018bf588 (&h->lhash2[i].lock){+.+.}-{2:2}, at: mptcp_diag_dump_listeners net/mptcp/mptcp_diag.c:95 [inline]
ffffc900018bf588 (&h->lhash2[i].lock){+.+.}-{2:2}, at: mptcp_diag_dump+0x869/0x1330 net/mptcp/mptcp_diag.c:194
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&h->lhash2[i].lock){+.+.}-{2:2}:
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:363 [inline]
__inet_hash+0xe4/0x8e0 net/ipv4/inet_hashtables.c:613
inet_csk_listen_start+0x231/0x310 net/ipv4/inet_connection_sock.c:1115
inet_listen+0x2c9/0x7c0 net/ipv4/af_inet.c:231
__sys_listen+0x1a7/0x220 net/socket.c:1754
__do_sys_listen net/socket.c:1763 [inline]
__se_sys_listen net/socket.c:1761 [inline]
__x64_sys_listen+0x56/0x60 net/socket.c:1761
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
-> #0 (sk_lock-AF_INET6){+.+.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3053 [inline]
check_prevs_add kernel/locking/lockdep.c:3172 [inline]
validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788
__lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
lock_sock_fast include/net/sock.h:1710 [inline]
mptcp_diag_get_info+0x276/0xa10 net/mptcp/mptcp_diag.c:224
inet_sk_diag_fill+0xf6a/0x1cb0 net/ipv4/inet_diag.c:342
sk_diag_dump net/mptcp/mptcp_diag.c:24 [inline]
mptcp_diag_dump_listeners net/mptcp/mptcp_diag.c:122 [inline]
mptcp_diag_dump+0xd1d/0x1330 net/mptcp/mptcp_diag.c:194
__inet_diag_dump+0x20e/0x3a0 net/ipv4/inet_diag.c:1179
netlink_dump+0x5a4/0xca0 net/netlink/af_netlink.c:2265
__netlink_dump_start+0x50f/0x6d0 net/netlink/af_netlink.c:2368
netlink_dump_start include/linux/netlink.h:258 [inline]
inet_diag_handler_cmd+0x1d7/0x2a0 net/ipv4/inet_diag.c:1344
sock_diag_rcv_msg+0xd5/0x400
netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2489
sock_diag_rcv+0x26/0x40 net/core/sock_diag.c:276
netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
netlink_unicast+0x7b6/0x980 net/netlink/af_netlink.c:1337
netlink_sendmsg+0xa30/0xd60 net/netlink/af_netlink.c:1905
sock_sendmsg_nosec net/socket.c:704 [inline]
__sock_sendmsg net/socket.c:716 [inline]
sock_write_iter+0x39b/0x530 net/socket.c:1079
do_iter_readv_writev+0x594/0x7a0
do_iter_write+0x1e6/0x760 fs/read_write.c:855
vfs_writev fs/read_write.c:928 [inline]
do_writev+0x281/0x470 fs/read_write.c:971
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&h->lhash2[i].lock);
lock(sk_lock-AF_INET6);
lock(&h->lhash2[i].lock);
lock(sk_lock-AF_INET6);
*** DEADLOCK ***
6 locks held by syz.3.302/5386:
#0: ffffffff8dc4b748 (sock_diag_mutex){+.+.}-{3:3}, at: sock_diag_rcv+0x17/0x40 net/core/sock_diag.c:275
#1: ffffffff8dc4b5a8 (sock_diag_table_mutex){+.+.}-{3:3}, at: __sock_diag_cmd net/core/sock_diag.c:229 [inline]
#1: ffffffff8dc4b5a8 (sock_diag_table_mutex){+.+.}-{3:3}, at: sock_diag_rcv_msg+0x206/0x400 net/core/sock_diag.c:265
#2: ffff888078f73690 (nlk_cb_mutex-SOCK_DIAG){+.+.}-{3:3}, at: __netlink_dump_start+0x12e/0x6d0 net/netlink/af_netlink.c:2334
#3: ffffffff8dd27f28 (inet_diag_table_mutex){+.+.}-{3:3}, at: inet_diag_lock_handler net/ipv4/inet_diag.c:63 [inline]
#3: ffffffff8dd27f28 (inet_diag_table_mutex){+.+.}-{3:3}, at: __inet_diag_dump+0x191/0x3a0 net/ipv4/inet_diag.c:1177
#4: ffffffff8cb1fd20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311
#5: ffffc900018bf588 (&h->lhash2[i].lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:363 [inline]
#5: ffffc900018bf588 (&h->lhash2[i].lock){+.+.}-{2:2}, at: mptcp_diag_dump_listeners net/mptcp/mptcp_diag.c:95 [inline]
#5: ffffc900018bf588 (&h->lhash2[i].lock){+.+.}-{2:2}, at: mptcp_diag_dump+0x869/0x1330 net/mptcp/mptcp_diag.c:194
stack backtrace:
CPU: 0 PID: 5386 Comm: syz.3.302 Not tainted 5.15.175-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133
check_prev_add kernel/locking/lockdep.c:3053 [inline]
check_prevs_add kernel/locking/lockdep.c:3172 [inline]
validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788
__lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
lock_sock_fast include/net/sock.h:1710 [inline]
mptcp_diag_get_info+0x276/0xa10 net/mptcp/mptcp_diag.c:224
inet_sk_diag_fill+0xf6a/0x1cb0 net/ipv4/inet_diag.c:342
sk_diag_dump net/mptcp/mptcp_diag.c:24 [inline]
mptcp_diag_dump_listeners net/mptcp/mptcp_diag.c:122 [inline]
mptcp_diag_dump+0xd1d/0x1330 net/mptcp/mptcp_diag.c:194
__inet_diag_dump+0x20e/0x3a0 net/ipv4/inet_diag.c:1179
netlink_dump+0x5a4/0xca0 net/netlink/af_netlink.c:2265
__netlink_dump_start+0x50f/0x6d0 net/netlink/af_netlink.c:2368
netlink_dump_start include/linux/netlink.h:258 [inline]
inet_diag_handler_cmd+0x1d7/0x2a0 net/ipv4/inet_diag.c:1344
sock_diag_rcv_msg+0xd5/0x400
netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2489
sock_diag_rcv+0x26/0x40 net/core/sock_diag.c:276
netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
netlink_unicast+0x7b6/0x980 net/netlink/af_netlink.c:1337
netlink_sendmsg+0xa30/0xd60 net/netlink/af_netlink.c:1905
sock_sendmsg_nosec net/socket.c:704 [inline]
__sock_sendmsg net/socket.c:716 [inline]
sock_write_iter+0x39b/0x530 net/socket.c:1079
do_iter_readv_writev+0x594/0x7a0
do_iter_write+0x1e6/0x760 fs/read_write.c:855
vfs_writev fs/read_write.c:928 [inline]
do_writev+0x281/0x470 fs/read_write.c:971
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f22c2ef8d29
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f22c0d69038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f22c30e8fa0 RCX: 00007f22c2ef8d29
RDX: 0000000000000001 RSI: 0000000020000280 RDI: 0000000000000007
RBP: 00007f22c2f74aa8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f22c30e8fa0 R15: 00007ffc2e9dc398
BUG: sleeping function called from invalid context at net/core/sock.c:3282
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5386, name: syz.3.302
INFO: lockdep is turned off.
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 0 PID: 5386 Comm: syz.3.302 Not tainted 5.15.175-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
___might_sleep+0x547/0x6a0 kernel/sched/core.c:9636
__lock_sock_fast+0x2f/0xe0 net/core/sock.c:3282
lock_sock_fast include/net/sock.h:1712 [inline]
mptcp_diag_get_info+0x282/0xa10 net/mptcp/mptcp_diag.c:224
inet_sk_diag_fill+0xf6a/0x1cb0 net/ipv4/inet_diag.c:342
sk_diag_dump net/mptcp/mptcp_diag.c:24 [inline]
mptcp_diag_dump_listeners net/mptcp/mptcp_diag.c:122 [inline]
mptcp_diag_dump+0xd1d/0x1330 net/mptcp/mptcp_diag.c:194
__inet_diag_dump+0x20e/0x3a0 net/ipv4/inet_diag.c:1179
netlink_dump+0x5a4/0xca0 net/netlink/af_netlink.c:2265
__netlink_dump_start+0x50f/0x6d0 net/netlink/af_netlink.c:2368
netlink_dump_start include/linux/netlink.h:258 [inline]
inet_diag_handler_cmd+0x1d7/0x2a0 net/ipv4/inet_diag.c:1344
sock_diag_rcv_msg+0xd5/0x400
netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2489
sock_diag_rcv+0x26/0x40 net/core/sock_diag.c:276
netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
netlink_unicast+0x7b6/0x980 net/netlink/af_netlink.c:1337
netlink_sendmsg+0xa30/0xd60 net/netlink/af_netlink.c:1905
sock_sendmsg_nosec net/socket.c:704 [inline]
__sock_sendmsg net/socket.c:716 [inline]
sock_write_iter+0x39b/0x530 net/socket.c:1079
do_iter_readv_writev+0x594/0x7a0
do_iter_write+0x1e6/0x760 fs/read_write.c:855
vfs_writev fs/read_write.c:928 [inline]
do_writev+0x281/0x470 fs/read_write.c:971
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f22c2ef8d29
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f22c0d69038 EFLAGS: 00000246
ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f22c30e8fa0 RCX: 00007f22c2ef8d29
RDX: 0000000000000001 RSI: 0000000020000280 RDI: 0000000000000007
RBP: 00007f22c2f74aa8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f22c30e8fa0 R15: 00007ffc2e9dc398