TCP: TCP_TX_DELAY enabled ====================================================== WARNING: possible circular locking dependency detected 6.12.0-rc5-syzkaller-00308-g3e5e6c9900c3 #0 Not tainted ------------------------------------------------------ syz.4.488/7935 is trying to acquire lock: ffffffff8fac53e8 (rtnl_mutex){+.+.}-{3:3}, at: do_ip_getsockopt+0x1e06/0x2bf0 net/ipv4/ip_sockglue.c:1702 but task is already holding lock: ffff88802898fda8 (&smc->clcsock_release_lock){+.+.}-{3:3}, at: smc_getsockopt+0xbd/0x360 net/smc/af_smc.c:3136 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&smc->clcsock_release_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752 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:729 [inline] __sock_sendmsg net/socket.c:744 [inline] ____sys_sendmsg+0x9ae/0xb40 net/socket.c:2607 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2661 __sys_sendmsg+0x117/0x1f0 net/socket.c:2690 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_INET){+.+.}-{0:0}: lock_sock_nested+0x3a/0xf0 net/core/sock.c:3611 lock_sock include/net/sock.h:1611 [inline] sockopt_lock_sock net/core/sock.c:1125 [inline] sockopt_lock_sock+0x54/0x70 net/core/sock.c:1116 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:2334 __sys_setsockopt+0x1a4/0x270 net/socket.c:2357 __do_sys_setsockopt net/socket.c:2366 [inline] __se_sys_setsockopt net/socket.c:2363 [inline] __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2363 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){+.+.}-{3:3}: 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+0x250b/0x3ce0 kernel/locking/lockdep.c:5202 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752 do_ip_getsockopt+0x1e06/0x2bf0 net/ipv4/ip_sockglue.c:1702 ip_getsockopt+0x9c/0x1e0 net/ipv4/ip_sockglue.c:1765 ipv6_getsockopt+0x230/0x280 net/ipv6/ipv6_sockglue.c:1478 tcp_getsockopt+0x9e/0x100 net/ipv4/tcp.c:4670 smc_getsockopt+0x163/0x360 net/smc/af_smc.c:3146 do_sock_getsockopt+0x3fe/0x870 net/socket.c:2396 __sys_getsockopt+0x1a1/0x270 net/socket.c:2425 __do_sys_getsockopt net/socket.c:2435 [inline] __se_sys_getsockopt net/socket.c:2432 [inline] __x64_sys_getsockopt+0xbd/0x160 net/socket.c:2432 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_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.4.488/7935: #0: ffff88802898fda8 (&smc->clcsock_release_lock){+.+.}-{3:3}, at: smc_getsockopt+0xbd/0x360 net/smc/af_smc.c:3136 stack backtrace: CPU: 0 UID: 0 PID: 7935 Comm: syz.4.488 Not tainted 6.12.0-rc5-syzkaller-00308-g3e5e6c9900c3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x419/0x5d0 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+0x250b/0x3ce0 kernel/locking/lockdep.c:5202 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752 do_ip_getsockopt+0x1e06/0x2bf0 net/ipv4/ip_sockglue.c:1702 ip_getsockopt+0x9c/0x1e0 net/ipv4/ip_sockglue.c:1765 ipv6_getsockopt+0x230/0x280 net/ipv6/ipv6_sockglue.c:1478 tcp_getsockopt+0x9e/0x100 net/ipv4/tcp.c:4670 smc_getsockopt+0x163/0x360 net/smc/af_smc.c:3146 do_sock_getsockopt+0x3fe/0x870 net/socket.c:2396 __sys_getsockopt+0x1a1/0x270 net/socket.c:2425 __do_sys_getsockopt net/socket.c:2435 [inline] __se_sys_getsockopt net/socket.c:2432 [inline] __x64_sys_getsockopt+0xbd/0x160 net/socket.c:2432 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: 0033:0x7f9db617e719 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:00007f9db6fba038 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 00007f9db6335f80 RCX: 00007f9db617e719 RDX: 0000000000000029 RSI: 0000000000000000 RDI: 0000000100000006 RBP: 00007f9db61f132e R08: 0000000000000000 R09: 0000000000000000 R10: 9999999999999999 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f9db6335f80 R15: 00007fffc64e71b8