====================================================== WARNING: possible circular locking dependency detected 6.13.0-rc2-syzkaller-g2e7aff49b5da #0 Not tainted ------------------------------------------------------ syz.1.187/7665 is trying to acquire lock: ffff0000f6138258 (sk_lock-AF_INET6){+.+.}-{0:0}, at: do_ipv6_setsockopt+0xab0/0x310c net/ipv6/ipv6_sockglue.c:567 but task is already holding lock: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (rtnl_mutex){+.+.}-{4:4}: __mutex_lock_common+0x218/0x28f4 kernel/locking/mutex.c:585 __mutex_lock kernel/locking/mutex.c:735 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:787 rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 start_sync_thread+0xe0/0x252c net/netfilter/ipvs/ip_vs_sync.c:1761 do_ip_vs_set_ctl+0x49c/0x10ac net/netfilter/ipvs/ip_vs_ctl.c:2732 nf_setsockopt+0x270/0x290 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0x118/0x128 net/ipv4/ip_sockglue.c:1424 tcp_setsockopt+0xcc/0xe8 net/ipv4/tcp.c:4030 sock_common_setsockopt+0xb0/0xcc net/core/sock.c:3814 smc_setsockopt+0x204/0x1104 net/smc/af_smc.c:3064 do_sock_setsockopt+0x2a0/0x4e0 net/socket.c:2313 __sys_setsockopt net/socket.c:2338 [inline] __do_sys_setsockopt net/socket.c:2344 [inline] __se_sys_setsockopt net/socket.c:2341 [inline] __arm64_sys_setsockopt+0x170/0x1e0 net/socket.c:2341 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #1 (&smc->clcsock_release_lock){+.+.}-{4:4}: __mutex_lock_common+0x218/0x28f4 kernel/locking/mutex.c:585 __mutex_lock kernel/locking/mutex.c:735 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:787 smc_switch_to_fallback+0x48/0xa7c net/smc/af_smc.c:903 smc_sendmsg+0xfc/0x9f8 net/smc/af_smc.c:2771 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg net/socket.c:726 [inline] __sys_sendto+0x360/0x4d8 net/socket.c:2197 __do_sys_sendto net/socket.c:2204 [inline] __se_sys_sendto net/socket.c:2200 [inline] __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2200 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #0 (sk_lock-AF_INET6){+.+.}-{0:0}: 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+0x34f0/0x7904 kernel/locking/lockdep.c:5226 lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5849 lock_sock_nested net/core/sock.c:3622 [inline] lock_sock include/net/sock.h:1617 [inline] sockopt_lock_sock+0x88/0x148 net/core/sock.c:1126 do_ipv6_setsockopt+0xab0/0x310c net/ipv6/ipv6_sockglue.c:567 ipv6_setsockopt+0x68/0x174 net/ipv6/ipv6_sockglue.c:993 sock_common_setsockopt+0xb0/0xcc net/core/sock.c:3814 do_sock_setsockopt+0x2a0/0x4e0 net/socket.c:2313 __sys_setsockopt net/socket.c:2338 [inline] __do_sys_setsockopt net/socket.c:2344 [inline] __se_sys_setsockopt net/socket.c:2341 [inline] __arm64_sys_setsockopt+0x170/0x1e0 net/socket.c:2341 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 other info that might help us debug this: Chain exists of: sk_lock-AF_INET6 --> &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_INET6); *** DEADLOCK *** 1 lock held by syz.1.187/7665: #0: ffff800092891c68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 stack backtrace: CPU: 1 UID: 0 PID: 7665 Comm: syz.1.187 Not tainted 6.13.0-rc2-syzkaller-g2e7aff49b5da #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:484 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x154/0x1c0 kernel/locking/lockdep.c:2074 check_noncircular+0x310/0x404 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+0x34f0/0x7904 kernel/locking/lockdep.c:5226 lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5849 lock_sock_nested net/core/sock.c:3622 [inline] lock_sock include/net/sock.h:1617 [inline] sockopt_lock_sock+0x88/0x148 net/core/sock.c:1126 do_ipv6_setsockopt+0xab0/0x310c net/ipv6/ipv6_sockglue.c:567 ipv6_setsockopt+0x68/0x174 net/ipv6/ipv6_sockglue.c:993 sock_common_setsockopt+0xb0/0xcc net/core/sock.c:3814 do_sock_setsockopt+0x2a0/0x4e0 net/socket.c:2313 __sys_setsockopt net/socket.c:2338 [inline] __do_sys_setsockopt net/socket.c:2344 [inline] __se_sys_setsockopt net/socket.c:2341 [inline] __arm64_sys_setsockopt+0x170/0x1e0 net/socket.c:2341 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600