======================================================
WARNING: possible circular locking dependency detected
6.15.0-rc1-syzkaller-00173-g0c7cae12f67c #0 Not tainted
------------------------------------------------------
syz.0.1196/10835 is trying to acquire lock:
ffff8881462ae0d8 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1651 [inline]
ffff8881462ae0d8 (sk_lock-AF_INET){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1148 [inline]
ffff8881462ae0d8 (sk_lock-AF_INET){+.+.}-{0:0}, at: sockopt_lock_sock+0x54/0x70 net/core/sock.c:1139

but task is already holding lock:
ffffffff9012dae8 (rtnl_mutex){+.+.}-{4:4}, at: do_ip_getsockopt+0x1843/0x2220 net/ipv4/ip_sockglue.c:1702

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (rtnl_mutex){+.+.}-{4:4}:
       __mutex_lock_common kernel/locking/mutex.c:601 [inline]
       __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746
       smc_vlan_by_tcpsk+0x251/0x620 net/smc/smc_core.c:1908
       __smc_connect+0x44b/0x4880 net/smc/af_smc.c:1520
       smc_connect+0x2fc/0x760 net/smc/af_smc.c:1696
       __sys_connect_file+0x13e/0x1a0 net/socket.c:2038
       __sys_connect+0x14d/0x170 net/socket.c:2057
       __do_sys_connect net/socket.c:2063 [inline]
       __se_sys_connect net/socket.c:2060 [inline]
       __x64_sys_connect+0x72/0xb0 net/socket.c:2060
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (sk_lock-AF_INET){+.+.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3166 [inline]
       check_prevs_add kernel/locking/lockdep.c:3285 [inline]
       validate_chain kernel/locking/lockdep.c:3909 [inline]
       __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235
       lock_acquire kernel/locking/lockdep.c:5866 [inline]
       lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
       lock_sock_nested+0x41/0xf0 net/core/sock.c:3702
       lock_sock include/net/sock.h:1651 [inline]
       sockopt_lock_sock net/core/sock.c:1148 [inline]
       sockopt_lock_sock+0x54/0x70 net/core/sock.c:1139
       do_ip_getsockopt+0x13e4/0x2220 net/ipv4/ip_sockglue.c:1703
       ip_getsockopt+0x9b/0x1e0 net/ipv4/ip_sockglue.c:1765
       raw_getsockopt+0x4d/0x1f0 net/ipv4/raw.c:865
       do_sock_getsockopt+0x3fc/0x800 net/socket.c:2357
       __sys_getsockopt+0x12f/0x260 net/socket.c:2386
       __do_sys_getsockopt net/socket.c:2393 [inline]
       __se_sys_getsockopt net/socket.c:2390 [inline]
       __x64_sys_getsockopt+0xbd/0x160 net/socket.c:2390
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(rtnl_mutex);
                               lock(sk_lock-AF_INET);
                               lock(rtnl_mutex);
  lock(sk_lock-AF_INET);

 *** DEADLOCK ***

1 lock held by syz.0.1196/10835:
 #0: ffffffff9012dae8 (rtnl_mutex){+.+.}-{4:4}, at: do_ip_getsockopt+0x1843/0x2220 net/ipv4/ip_sockglue.c:1702

stack backtrace:
CPU: 0 UID: 0 PID: 10835 Comm: syz.0.1196 Not tainted 6.15.0-rc1-syzkaller-00173-g0c7cae12f67c #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2079
 check_noncircular+0x14c/0x170 kernel/locking/lockdep.c:2211
 check_prev_add kernel/locking/lockdep.c:3166 [inline]
 check_prevs_add kernel/locking/lockdep.c:3285 [inline]
 validate_chain kernel/locking/lockdep.c:3909 [inline]
 __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235
 lock_acquire kernel/locking/lockdep.c:5866 [inline]
 lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
 lock_sock_nested+0x41/0xf0 net/core/sock.c:3702
 lock_sock include/net/sock.h:1651 [inline]
 sockopt_lock_sock net/core/sock.c:1148 [inline]
 sockopt_lock_sock+0x54/0x70 net/core/sock.c:1139
 do_ip_getsockopt+0x13e4/0x2220 net/ipv4/ip_sockglue.c:1703
 ip_getsockopt+0x9b/0x1e0 net/ipv4/ip_sockglue.c:1765
 raw_getsockopt+0x4d/0x1f0 net/ipv4/raw.c:865
 do_sock_getsockopt+0x3fc/0x800 net/socket.c:2357
 __sys_getsockopt+0x12f/0x260 net/socket.c:2386
 __do_sys_getsockopt net/socket.c:2393 [inline]
 __se_sys_getsockopt net/socket.c:2390 [inline]
 __x64_sys_getsockopt+0xbd/0x160 net/socket.c:2390
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3e4a78d169
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:00007f3e485f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007f3e4a9a5fa0 RCX: 00007f3e4a78d169
RDX: 0000000000000029 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f3e4a80e990 R08: 0000200000000040 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3e4a9a5fa0 R15: 00007ffe7660ab08
 </TASK>