====================================================== WARNING: possible circular locking dependency detected 6.12.0-syzkaller-01892-g8f7c8b88bda4 #0 Not tainted ------------------------------------------------------ syz.1.632/8575 is trying to acquire lock: ffffffff8face8a8 (rtnl_mutex){+.+.}-{4:4}, at: do_ip_setsockopt+0xf9/0x38c0 net/ipv4/ip_sockglue.c:1077 but task is already holding lock: ffff888034d52d28 (&smc->clcsock_release_lock){+.+.}-{4:4}, at: smc_setsockopt+0x101/0xc00 net/smc/af_smc.c:3056 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&smc->clcsock_release_lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735 smc_switch_to_fallback+0x2d/0xa00 net/smc/af_smc.c:902 smc_sendmsg+0x13d/0x520 net/smc/af_smc.c:2771 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg net/socket.c:726 [inline] ____sys_sendmsg+0x9ae/0xb40 net/socket.c:2581 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2635 __sys_sendmsg+0x16e/0x220 net/socket.c:2667 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 -> #1 (sk_lock-AF_INET6){+.+.}-{0:0}: lock_sock_nested+0x3a/0xf0 net/core/sock.c:3617 lock_sock include/net/sock.h:1611 [inline] sockopt_lock_sock net/core/sock.c:1131 [inline] sockopt_lock_sock+0x54/0x70 net/core/sock.c:1122 do_ipv6_setsockopt+0x1f55/0x4800 net/ipv6/ipv6_sockglue.c:567 ipv6_setsockopt+0xcb/0x170 net/ipv6/ipv6_sockglue.c:993 udpv6_setsockopt+0x7d/0xd0 net/ipv6/udp.c:1704 do_sock_setsockopt+0x222/0x480 net/socket.c:2311 __sys_setsockopt+0x1a0/0x230 net/socket.c:2336 __do_sys_setsockopt net/socket.c:2342 [inline] __se_sys_setsockopt net/socket.c:2339 [inline] __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2339 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 -> #0 (rtnl_mutex){+.+.}-{4:4}: 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 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735 do_ip_setsockopt+0xf9/0x38c0 net/ipv4/ip_sockglue.c:1077 ip_setsockopt+0x59/0xf0 net/ipv4/ip_sockglue.c:1417 tcp_setsockopt+0xa4/0x100 net/ipv4/tcp.c:4029 smc_setsockopt+0x1b4/0xc00 net/smc/af_smc.c:3064 do_sock_setsockopt+0x222/0x480 net/socket.c:2311 __sys_setsockopt+0x1a0/0x230 net/socket.c:2336 __do_sys_setsockopt net/socket.c:2342 [inline] __se_sys_setsockopt net/socket.c:2339 [inline] __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2339 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: Chain exists of: rtnl_mutex --> sk_lock-AF_INET6 --> &smc->clcsock_release_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&smc->clcsock_release_lock); lock(sk_lock-AF_INET6); lock(&smc->clcsock_release_lock); lock(rtnl_mutex); *** DEADLOCK *** 1 lock held by syz.1.632/8575: #0: ffff888034d52d28 (&smc->clcsock_release_lock){+.+.}-{4:4}, at: smc_setsockopt+0x101/0xc00 net/smc/af_smc.c:3056 stack backtrace: CPU: 1 UID: 0 PID: 8575 Comm: syz.1.632 Not tainted 6.12.0-syzkaller-01892-g8f7c8b88bda4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: __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 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735 do_ip_setsockopt+0xf9/0x38c0 net/ipv4/ip_sockglue.c:1077 ip_setsockopt+0x59/0xf0 net/ipv4/ip_sockglue.c:1417 tcp_setsockopt+0xa4/0x100 net/ipv4/tcp.c:4029 smc_setsockopt+0x1b4/0xc00 net/smc/af_smc.c:3064 do_sock_setsockopt+0x222/0x480 net/socket.c:2311 __sys_setsockopt+0x1a0/0x230 net/socket.c:2336 __do_sys_setsockopt net/socket.c:2342 [inline] __se_sys_setsockopt net/socket.c:2339 [inline] __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2339 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: 0033:0x7fd7c337e819 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:00007fd7c4174038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fd7c3535fa0 RCX: 00007fd7c337e819 RDX: 0000000000000024 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007fd7c33f175e R08: 0000000000000028 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fd7c3535fa0 R15: 00007ffdf16269d8