======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc7-syzkaller-00196-g88d324e69ea9 #0 Not tainted
------------------------------------------------------
syz-executor192/5832 is trying to acquire lock:
ffff888067c60258 (sk_lock-AF_INET){+.+.}-{0:0}, at: do_ip_setsockopt+0x1966/0x3ae0 net/ipv4/ip_sockglue.c:1078
but task is already holding lock:
ffffffff8fed5f48 (rtnl_mutex){+.+.}-{4:4}, at: do_ip_setsockopt+0x11ef/0x3ae0 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}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730
smc_vlan_by_tcpsk+0x399/0x4e0 net/smc/smc_core.c:1908
__smc_connect+0x296/0x1910 net/smc/af_smc.c:1520
smc_connect+0x868/0xde0 net/smc/af_smc.c:1696
__sys_connect_file net/socket.c:2045 [inline]
__sys_connect+0x288/0x2d0 net/socket.c:2064
__do_sys_connect net/socket.c:2070 [inline]
__se_sys_connect net/socket.c:2067 [inline]
__x64_sys_connect+0x7a/0x90 net/socket.c:2067
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (sk_lock-AF_INET){+.+.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
lock_sock_nested+0x48/0x100 net/core/sock.c:3662
do_ip_setsockopt+0x1966/0x3ae0 net/ipv4/ip_sockglue.c:1078
ip_setsockopt+0x63/0x100 net/ipv4/ip_sockglue.c:1417
do_sock_setsockopt+0x3af/0x720 net/socket.c:2303
__sys_setsockopt net/socket.c:2328 [inline]
__do_sys_setsockopt net/socket.c:2334 [inline]
__se_sys_setsockopt net/socket.c:2331 [inline]
__x64_sys_setsockopt+0x1ee/0x280 net/socket.c:2331
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 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-executor192/5832:
#0: ffffffff8fed5f48 (rtnl_mutex){+.+.}-{4:4}, at: do_ip_setsockopt+0x11ef/0x3ae0 net/ipv4/ip_sockglue.c:1077
stack backtrace:
CPU: 0 UID: 0 PID: 5832 Comm: syz-executor192 Not tainted 6.14.0-rc7-syzkaller-00196-g88d324e69ea9 #0
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+0x241/0x360 lib/dump_stack.c:120
print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2076
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
lock_sock_nested+0x48/0x100 net/core/sock.c:3662
do_ip_setsockopt+0x1966/0x3ae0 net/ipv4/ip_sockglue.c:1078
ip_setsockopt+0x63/0x100 net/ipv4/ip_sockglue.c:1417
do_sock_setsockopt+0x3af/0x720 net/socket.c:2303
__sys_setsockopt net/socket.c:2328 [inline]
__do_sys_setsockopt net/socket.c:2334 [inline]
__se_sys_setsockopt net/socket.c:2331 [inline]
__x64_sys_setsockopt+0x1ee/0x280 net/socket.c:2331
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc0a2a2dab9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffecfcd3088 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc0a2a2dab9
RDX: 0000000000000023 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fc0a2aa05f0 R08: 0000000000000000 R09: 0000000000000006
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001
</TASK>