======================================================
WARNING: possible circular locking dependency detected
6.13.0-rc3-syzkaller #0 Not tainted
------------------------------------------------------
syz.1.2052/14161 is trying to acquire lock:
ffff888145ae5a18 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1617 [inline]
ffff888145ae5a18 (sk_lock-AF_INET){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1126 [inline]
ffff888145ae5a18 (sk_lock-AF_INET){+.+.}-{0:0}, at: sockopt_lock_sock+0x54/0x70 net/core/sock.c:1117

but task is already holding lock:
ffffffff8fabf288 (rtnl_mutex){+.+.}-{4:4}, at: do_ip_setsockopt+0xf9/0x38c0 net/ipv4/ip_sockglue.c:1077

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:585 [inline]
       __mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735
       smc_vlan_by_tcpsk+0x251/0x620 net/smc/smc_core.c:1898
       __smc_connect+0x466/0x4890 net/smc/af_smc.c:1517
       smc_connect_work+0x54f/0xae0 net/smc/af_smc.c:1610
       process_one_work+0x958/0x1b30 kernel/workqueue.c:3229
       process_scheduled_works kernel/workqueue.c:3310 [inline]
       worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
       kthread+0x2c1/0x3a0 kernel/kthread.c:389
       ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

-> #0 (sk_lock-AF_INET){+.+.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3161 [inline]
       check_prevs_add kernel/locking/lockdep.c:3280 [inline]
       validate_chain kernel/locking/lockdep.c:3904 [inline]
       __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226
       lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
       lock_sock_nested+0x3a/0xf0 net/core/sock.c:3622
       lock_sock include/net/sock.h:1617 [inline]
       sockopt_lock_sock net/core/sock.c:1126 [inline]
       sockopt_lock_sock+0x54/0x70 net/core/sock.c:1117
       do_ip_setsockopt+0x101/0x38c0 net/ipv4/ip_sockglue.c:1078
       ip_setsockopt+0x59/0xf0 net/ipv4/ip_sockglue.c:1417
       raw_setsockopt+0xb8/0x290 net/ipv4/raw.c:845
       do_sock_setsockopt+0x222/0x480 net/socket.c:2313
       __sys_setsockopt+0x1a0/0x230 net/socket.c:2338
       __do_sys_setsockopt net/socket.c:2344 [inline]
       __se_sys_setsockopt net/socket.c:2341 [inline]
       __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2341
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
       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.1.2052/14161:
 #0: ffffffff8fabf288 (rtnl_mutex){+.+.}-{4:4}, at: do_ip_setsockopt+0xf9/0x38c0 net/ipv4/ip_sockglue.c:1077

stack backtrace:
CPU: 0 UID: 0 PID: 14161 Comm: syz.1.2052 Not tainted 6.13.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_circular_bug+0x41c/0x610 kernel/locking/lockdep.c:2074
 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2206
 check_prev_add kernel/locking/lockdep.c:3161 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain kernel/locking/lockdep.c:3904 [inline]
 __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226
 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
 lock_sock_nested+0x3a/0xf0 net/core/sock.c:3622
 lock_sock include/net/sock.h:1617 [inline]
 sockopt_lock_sock net/core/sock.c:1126 [inline]
 sockopt_lock_sock+0x54/0x70 net/core/sock.c:1117
 do_ip_setsockopt+0x101/0x38c0 net/ipv4/ip_sockglue.c:1078
 ip_setsockopt+0x59/0xf0 net/ipv4/ip_sockglue.c:1417
 raw_setsockopt+0xb8/0x290 net/ipv4/raw.c:845
 do_sock_setsockopt+0x222/0x480 net/socket.c:2313
 __sys_setsockopt+0x1a0/0x230 net/socket.c:2338
 __do_sys_setsockopt net/socket.c:2344 [inline]
 __se_sys_setsockopt net/socket.c:2341 [inline]
 __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2341
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8cc8585d19
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:00007f8cc63f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f8cc8775fa0 RCX: 00007f8cc8585d19
RDX: 0000000000000028 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f8cc8601a20 R08: 0000000000000070 R09: 0000000000000000
R10: ffffffffff600000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f8cc8775fa0 R15: 00007fffb7740858
 </TASK>