====================================================== WARNING: possible circular locking dependency detected 6.10.0-rc6-next-20240703-syzkaller #0 Not tainted ------------------------------------------------------ syz.4.2164/18168 is trying to acquire lock: ffffffff8f5ff788 (rtnl_mutex){+.+.}-{3:3}, at: do_ip_getsockopt+0x10f5/0x2940 net/ipv4/ip_sockglue.c:1702 but task is already holding lock: ffff88807ce84c50 (&smc->clcsock_release_lock){+.+.}-{3:3}, at: smc_getsockopt+0x144/0x3e0 net/smc/af_smc.c:3144 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&smc->clcsock_release_lock){+.+.}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5816 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 smc_switch_to_fallback+0x35/0xd00 net/smc/af_smc.c:902 smc_sendmsg+0x11f/0x530 net/smc/af_smc.c:2779 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2204 __do_sys_sendto net/socket.c:2216 [inline] __se_sys_sendto net/socket.c:2212 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2212 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 -> #1 (sk_lock-AF_INET){+.+.}-{0:0}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5816 lock_sock_nested+0x48/0x100 net/core/sock.c:3543 do_ip_setsockopt+0x1a2d/0x3cd0 net/ipv4/ip_sockglue.c:1078 ip_setsockopt+0x63/0x100 net/ipv4/ip_sockglue.c:1417 do_sock_setsockopt+0x3af/0x720 net/socket.c:2324 __sys_setsockopt+0x1ae/0x250 net/socket.c:2347 __do_sys_setsockopt net/socket.c:2356 [inline] __se_sys_setsockopt net/socket.c:2353 [inline] __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2353 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 (rtnl_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3158 [inline] check_prevs_add kernel/locking/lockdep.c:3277 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3901 __lock_acquire+0x1359/0x2000 kernel/locking/lockdep.c:5193 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5816 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 do_ip_getsockopt+0x10f5/0x2940 net/ipv4/ip_sockglue.c:1702 ip_getsockopt+0xed/0x2e0 net/ipv4/ip_sockglue.c:1765 tcp_getsockopt+0x163/0x1c0 net/ipv4/tcp.c:4409 smc_getsockopt+0x1d9/0x3e0 net/smc/af_smc.c:3154 do_sock_getsockopt+0x373/0x850 net/socket.c:2386 __sys_getsockopt+0x271/0x330 net/socket.c:2415 __do_sys_getsockopt net/socket.c:2425 [inline] __se_sys_getsockopt net/socket.c:2422 [inline] __x64_sys_getsockopt+0xb5/0xd0 net/socket.c:2422 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: Chain exists of: rtnl_mutex --> sk_lock-AF_INET --> &smc->clcsock_release_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&smc->clcsock_release_lock); lock(sk_lock-AF_INET); lock(&smc->clcsock_release_lock); lock(rtnl_mutex); *** DEADLOCK *** 1 lock held by syz.4.2164/18168: #0: ffff88807ce84c50 (&smc->clcsock_release_lock){+.+.}-{3:3}, at: smc_getsockopt+0x144/0x3e0 net/smc/af_smc.c:3144 stack backtrace: CPU: 0 UID: 0 PID: 18168 Comm: syz.4.2164 Not tainted 6.10.0-rc6-next-20240703-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __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:2074 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2203 check_prev_add kernel/locking/lockdep.c:3158 [inline] check_prevs_add kernel/locking/lockdep.c:3277 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3901 __lock_acquire+0x1359/0x2000 kernel/locking/lockdep.c:5193 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5816 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 do_ip_getsockopt+0x10f5/0x2940 net/ipv4/ip_sockglue.c:1702 ip_getsockopt+0xed/0x2e0 net/ipv4/ip_sockglue.c:1765 tcp_getsockopt+0x163/0x1c0 net/ipv4/tcp.c:4409 smc_getsockopt+0x1d9/0x3e0 net/smc/af_smc.c:3154 do_sock_getsockopt+0x373/0x850 net/socket.c:2386 __sys_getsockopt+0x271/0x330 net/socket.c:2415 __do_sys_getsockopt net/socket.c:2425 [inline] __se_sys_getsockopt net/socket.c:2422 [inline] __x64_sys_getsockopt+0xb5/0xd0 net/socket.c:2422 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: 0033:0x7fa7f3175bd9 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:00007fa7f2bff048 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 00007fa7f3303f60 RCX: 00007fa7f3175bd9 RDX: 0000000000000029 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007fa7f31e4aa1 R08: 00000000200000c0 R09: 0000000000000000 R10: 0000000020000080 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fa7f3303f60 R15: 00007fffb5a9a058