====================================================== WARNING: possible circular locking dependency detected 6.14.0-rc5-syzkaller-00268-g1110ce6a1e34 #0 Not tainted ------------------------------------------------------ syz.3.280/6955 is trying to acquire lock: ffff8880238b0fd8 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1624 [inline] ffff8880238b0fd8 (sk_lock-AF_INET){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1133 [inline] ffff8880238b0fd8 (sk_lock-AF_INET){+.+.}-{0:0}, at: sockopt_lock_sock+0x54/0x70 net/core/sock.c:1124 but task is already holding lock: ffffffff8fef7ea8 (rtnl_mutex){+.+.}-{4:4}, at: do_ip_setsockopt+0xf9/0x3680 net/ipv4/ip_sockglue.c:1077 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (rtnl_mutex){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xb10 kernel/locking/mutex.c:730 start_sync_thread+0x134/0x28e0 net/netfilter/ipvs/ip_vs_sync.c:1761 do_ip_vs_set_ctl+0x452/0x11c0 net/netfilter/ipvs/ip_vs_ctl.c:2732 nf_setsockopt+0x8a/0xf0 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0xcb/0xf0 net/ipv4/ip_sockglue.c:1424 tcp_setsockopt+0xa4/0x100 net/ipv4/tcp.c:4043 smc_setsockopt+0x1b4/0xa00 net/smc/af_smc.c:3081 do_sock_setsockopt+0x222/0x480 net/socket.c:2303 __sys_setsockopt+0x1a0/0x230 net/socket.c:2328 __do_sys_setsockopt net/socket.c:2334 [inline] __se_sys_setsockopt net/socket.c:2331 [inline] __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2331 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 (&smc->clcsock_release_lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xb10 kernel/locking/mutex.c:730 smc_switch_to_fallback+0x2d/0xa00 net/smc/af_smc.c:903 smc_sendmsg+0x13d/0x520 net/smc/af_smc.c:2781 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:733 [inline] __sys_sendto+0x488/0x4f0 net/socket.c:2187 __do_sys_sendto net/socket.c:2194 [inline] __se_sys_sendto net/socket.c:2190 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2190 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 (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 kernel/locking/lockdep.c:3906 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5228 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851 lock_sock_nested+0x3a/0xf0 net/core/sock.c:3662 lock_sock include/net/sock.h:1624 [inline] sockopt_lock_sock net/core/sock.c:1133 [inline] sockopt_lock_sock+0x54/0x70 net/core/sock.c:1124 do_ip_setsockopt+0x101/0x3680 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:2303 __sys_setsockopt+0x1a0/0x230 net/socket.c:2328 __do_sys_setsockopt net/socket.c:2334 [inline] __se_sys_setsockopt net/socket.c:2331 [inline] __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2331 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: sk_lock-AF_INET --> &smc->clcsock_release_lock --> rtnl_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(rtnl_mutex); lock(&smc->clcsock_release_lock); lock(rtnl_mutex); lock(sk_lock-AF_INET); *** DEADLOCK *** 1 lock held by syz.3.280/6955: #0: ffffffff8fef7ea8 (rtnl_mutex){+.+.}-{4:4}, at: do_ip_setsockopt+0xf9/0x3680 net/ipv4/ip_sockglue.c:1077 stack backtrace: CPU: 1 UID: 0 PID: 6955 Comm: syz.3.280 Not tainted 6.14.0-rc5-syzkaller-00268-g1110ce6a1e34 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x490/0x760 kernel/locking/lockdep.c:2076 check_noncircular+0x31a/0x400 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 kernel/locking/lockdep.c:3906 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5228 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851 lock_sock_nested+0x3a/0xf0 net/core/sock.c:3662 lock_sock include/net/sock.h:1624 [inline] sockopt_lock_sock net/core/sock.c:1133 [inline] sockopt_lock_sock+0x54/0x70 net/core/sock.c:1124 do_ip_setsockopt+0x101/0x3680 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:2303 __sys_setsockopt+0x1a0/0x230 net/socket.c:2328 __do_sys_setsockopt net/socket.c:2334 [inline] __se_sys_setsockopt net/socket.c:2331 [inline] __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2331 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: 0033:0x7f1d93f8d169 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:00007f1d94e42038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f1d941a6080 RCX: 00007f1d93f8d169 RDX: 0000000000000023 RSI: 0000000000000000 RDI: 0000000000000007 RBP: 00007f1d9400e2a0 R08: 0000000000000008 R09: 0000000000000000 R10: 0000400000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f1d941a6080 R15: 00007ffdf1fd9068