======================================================
WARNING: possible circular locking dependency detected
6.15.0-rc1-syzkaller-00065-g3b07108ada81 #0 Tainted: G U
------------------------------------------------------
syz.1.2250/14639 is trying to acquire lock:
ffff8880318d36d8 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1615 [inline]
ffff8880318d36d8 (sk_lock-AF_INET){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1148 [inline]
ffff8880318d36d8 (sk_lock-AF_INET){+.+.}-{0:0}, at: sockopt_lock_sock+0x54/0x70 net/core/sock.c:1139
but task is already holding lock:
ffffffff9012d9e8 (rtnl_mutex){+.+.}-{4:4}, at: do_ip_setsockopt+0xf6/0x3240 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: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_work+0x54c/0xae0 net/smc/af_smc.c:1613
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #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:3697
lock_sock include/net/sock.h:1615 [inline]
sockopt_lock_sock net/core/sock.c:1148 [inline]
sockopt_lock_sock+0x54/0x70 net/core/sock.c:1139
do_ip_setsockopt+0xfe/0x3240 net/ipv4/ip_sockglue.c:1078
ip_setsockopt+0x59/0xf0 net/ipv4/ip_sockglue.c:1417
dccp_setsockopt+0xfa/0x970 net/dccp/proto.c:579
do_sock_setsockopt+0x221/0x470 net/socket.c:2296
__sys_setsockopt+0x1a0/0x230 net/socket.c:2321
__do_sys_setsockopt net/socket.c:2327 [inline]
__se_sys_setsockopt net/socket.c:2324 [inline]
__x64_sys_setsockopt+0xbd/0x160 net/socket.c:2324
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.1.2250/14639:
#0: ffffffff9012d9e8 (rtnl_mutex){+.+.}-{4:4}, at: do_ip_setsockopt+0xf6/0x3240 net/ipv4/ip_sockglue.c:1077
stack backtrace:
CPU: 0 UID: 0 PID: 14639 Comm: syz.1.2250 Tainted: G U 6.15.0-rc1-syzkaller-00065-g3b07108ada81 #0 PREEMPT(full)
Tainted: [U]=USER
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:3697
lock_sock include/net/sock.h:1615 [inline]
sockopt_lock_sock net/core/sock.c:1148 [inline]
sockopt_lock_sock+0x54/0x70 net/core/sock.c:1139
do_ip_setsockopt+0xfe/0x3240 net/ipv4/ip_sockglue.c:1078
ip_setsockopt+0x59/0xf0 net/ipv4/ip_sockglue.c:1417
dccp_setsockopt+0xfa/0x970 net/dccp/proto.c:579
do_sock_setsockopt+0x221/0x470 net/socket.c:2296
__sys_setsockopt+0x1a0/0x230 net/socket.c:2321
__do_sys_setsockopt net/socket.c:2327 [inline]
__se_sys_setsockopt net/socket.c:2324 [inline]
__x64_sys_setsockopt+0xbd/0x160 net/socket.c:2324
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: 0033:0x7fe0c938d169
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:00007fe0ca11c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fe0c95a5fa0 RCX: 00007fe0c938d169
RDX: 0000000000000024 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 00007fe0c940e730 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe0c95a5fa0 R15: 00007ffc579f3488
</TASK>