====================================================== WARNING: possible circular locking dependency detected 6.12.0-syzkaller-g7b1d1d4cfac0 #0 Not tainted ------------------------------------------------------ syz.4.516/9851 is trying to acquire lock: ffff8000927f3628 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 but task is already holding lock: ffff0000dbb78aa8 (&smc->clcsock_release_lock){+.+.}-{3:3}, at: smc_getsockopt+0x158/0x54c 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+0x190/0x21a0 kernel/locking/mutex.c:608 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 smc_switch_to_fallback+0x48/0xa80 net/smc/af_smc.c:902 smc_sendmsg+0xfc/0x9f8 net/smc/af_smc.c:2771 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg net/socket.c:744 [inline] __sys_sendto+0x374/0x4f4 net/socket.c:2214 __do_sys_sendto net/socket.c:2226 [inline] __se_sys_sendto net/socket.c:2222 [inline] __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2222 __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 (sk_lock-AF_INET){+.+.}-{0:0}: lock_sock_nested net/core/sock.c:3617 [inline] lock_sock include/net/sock.h:1611 [inline] sockopt_lock_sock+0x88/0x148 net/core/sock.c:1131 do_ip_setsockopt+0x145c/0x3484 net/ipv4/ip_sockglue.c:1078 ip_setsockopt+0x80/0x128 net/ipv4/ip_sockglue.c:1417 udp_setsockopt+0xb8/0xd0 net/ipv4/udp.c:2809 sock_common_setsockopt+0xb0/0xcc net/core/sock.c:3809 do_sock_setsockopt+0x2a0/0x4e0 net/socket.c:2334 __sys_setsockopt+0x128/0x1a8 net/socket.c:2357 __do_sys_setsockopt net/socket.c:2366 [inline] __se_sys_setsockopt net/socket.c:2363 [inline] __arm64_sys_setsockopt+0xb8/0xd4 net/socket.c:2363 __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 (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+0x33f8/0x77c8 kernel/locking/lockdep.c:5202 lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5825 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:608 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 do_ip_getsockopt+0xcec/0x1d68 net/ipv4/ip_sockglue.c:1702 ip_getsockopt+0xac/0x380 net/ipv4/ip_sockglue.c:1765 tcp_getsockopt+0xcc/0xe8 net/ipv4/tcp.c:4670 sock_common_getsockopt+0xa8/0xc4 net/core/sock.c:3782 smc_getsockopt+0x1d4/0x54c net/smc/af_smc.c:3146 do_sock_getsockopt+0x398/0x5d8 net/socket.c:2396 __sys_getsockopt+0x120/0x19c net/socket.c:2425 __do_sys_getsockopt net/socket.c:2435 [inline] __se_sys_getsockopt net/socket.c:2432 [inline] __arm64_sys_getsockopt+0xb8/0xd4 net/socket.c:2432 __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: 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.4.516/9851: #0: ffff0000dbb78aa8 (&smc->clcsock_release_lock){+.+.}-{3:3}, at: smc_getsockopt+0x158/0x54c net/smc/af_smc.c:3136 stack backtrace: CPU: 0 UID: 0 PID: 9851 Comm: syz.4.516 Not tainted 6.12.0-syzkaller-g7b1d1d4cfac0 #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+0x33f8/0x77c8 kernel/locking/lockdep.c:5202 lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5825 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:608 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 do_ip_getsockopt+0xcec/0x1d68 net/ipv4/ip_sockglue.c:1702 ip_getsockopt+0xac/0x380 net/ipv4/ip_sockglue.c:1765 tcp_getsockopt+0xcc/0xe8 net/ipv4/tcp.c:4670 sock_common_getsockopt+0xa8/0xc4 net/core/sock.c:3782 smc_getsockopt+0x1d4/0x54c net/smc/af_smc.c:3146 do_sock_getsockopt+0x398/0x5d8 net/socket.c:2396 __sys_getsockopt+0x120/0x19c net/socket.c:2425 __do_sys_getsockopt net/socket.c:2435 [inline] __se_sys_getsockopt net/socket.c:2432 [inline] __arm64_sys_getsockopt+0xb8/0xd4 net/socket.c:2432 __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