BUG: sleeping function called from invalid context at net/core/sock.c:3291
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 6580, name: syz.1.681
7 locks held by syz.1.681/6580:
 #0: ffffffff8d446128 (sock_diag_mutex){+.+.}-{3:3}, at: sock_diag_rcv+0x17/0x40 net/core/sock_diag.c:275
 #1: ffffffff8d445fe8 (sock_diag_table_mutex){+.+.}-{3:3}, at: sock_diag_rcv_msg+0x14a/0x3e0 net/core/sock_diag.c:255
 #2: ffff8880744b2698 (nlk_cb_mutex-SOCK_DIAG){+.+.}-{3:3}, at: __netlink_dump_start+0x11f/0x700 net/netlink/af_netlink.c:2352
 #3: ffffffff8d51ff88 (inet_diag_table_mutex){+.+.}-{3:3}, at: inet_diag_lock_handler net/ipv4/inet_diag.c:63 [inline]
 #3: ffffffff8d51ff88 (inet_diag_table_mutex){+.+.}-{3:3}, at: __inet_diag_dump+0x181/0x380 net/ipv4/inet_diag.c:1177
 #4: ffffffff8c31eaa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312
 #5: ffffc900018605a0 (&h->lhash2[i].lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:364 [inline]
 #5: ffffc900018605a0 (&h->lhash2[i].lock){+.+.}-{2:2}, at: mptcp_diag_dump_listeners net/mptcp/mptcp_diag.c:95 [inline]
 #5: ffffc900018605a0 (&h->lhash2[i].lock){+.+.}-{2:2}, at: mptcp_diag_dump+0x917/0x12b0 net/mptcp/mptcp_diag.c:194
 #6: ffff88807a608ca0 (msk_lock-AF_INET){+.+.}-{0:0}, at: inet_sk_diag_fill+0xf5e/0x1ca0 net/ipv4/inet_diag.c:342
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 1 PID: 6580 Comm: syz.1.681 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 ___might_sleep+0x493/0x610 kernel/sched/core.c:9658
 __lock_sock_fast+0x2f/0xe0 net/core/sock.c:3291
 lock_sock_fast include/net/sock.h:1778 [inline]
 mptcp_diag_get_info+0x1fe/0x9e0 net/mptcp/mptcp_diag.c:224
 inet_sk_diag_fill+0xf5e/0x1ca0 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+0xce6/0x12b0 net/mptcp/mptcp_diag.c:194
 __inet_diag_dump+0x1f6/0x380 net/ipv4/inet_diag.c:1179
 inet_diag_dump_compat+0x17e/0x220 net/ipv4/inet_diag.c:1288
 netlink_dump+0x694/0xcf0 net/netlink/af_netlink.c:2283
 __netlink_dump_start+0x523/0x700 net/netlink/af_netlink.c:2386
 netlink_dump_start include/linux/netlink.h:258 [inline]
 inet_diag_rcv_msg_compat+0x207/0x420 net/ipv4/inet_diag.c:1323
 sock_diag_rcv_msg+0x164/0x3e0 net/core/sock_diag.c:-1
 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2507
 sock_diag_rcv+0x26/0x40 net/core/sock_diag.c:276
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:706 [inline]
 __sock_sendmsg net/socket.c:718 [inline]
 ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2445
 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2499
 __sys_sendmsg net/socket.c:2528 [inline]
 __do_sys_sendmsg net/socket.c:2537 [inline]
 __se_sys_sendmsg+0x1af/0x290 net/socket.c:2535
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fccf78ebeb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fccf5b05028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fccf7b67180 RCX: 00007fccf78ebeb9
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000009
RBP: 00007fccf7959c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fccf7b67218 R14: 00007fccf7b67180 R15: 00007ffd9e6856f8
 </TASK>