====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc2-syzkaller-gc72692105976 #0 Not tainted ------------------------------------------------------ syz.1.203/7720 is trying to acquire lock: ffff0000c4c70aa8 (&smc->clcsock_release_lock){+.+.}-{4:4}, at: smc_switch_to_fallback+0x48/0xa7c net/smc/af_smc.c:903 but task is already holding lock: ffff0000c4c70258 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1651 [inline] ffff0000c4c70258 (sk_lock-AF_INET){+.+.}-{0:0}, at: smc_sendmsg+0x60/0x9f8 net/smc/af_smc.c:2775 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (sk_lock-AF_INET){+.+.}-{0:0}: lock_sock_nested net/core/sock.c:3702 [inline] lock_sock include/net/sock.h:1651 [inline] sock_set_reuseaddr+0x58/0x154 net/core/sock.c:788 siw_create_listen+0x164/0xe50 drivers/infiniband/sw/siw/siw_cm.c:1777 iw_cm_listen+0x14c/0x204 drivers/infiniband/core/iwcm.c:587 cma_iw_listen drivers/infiniband/core/cma.c:2698 [inline] rdma_listen+0x8d0/0xb64 drivers/infiniband/core/cma.c:3983 cma_listen_on_dev+0x31c/0x648 drivers/infiniband/core/cma.c:2757 cma_add_one+0x5ec/0xab4 drivers/infiniband/core/cma.c:5387 add_client_context+0x45c/0x7d0 drivers/infiniband/core/device.c:720 enable_device_and_get+0x1a8/0x3e8 drivers/infiniband/core/device.c:1331 ib_register_device+0xe84/0x110c drivers/infiniband/core/device.c:1447 siw_device_register drivers/infiniband/sw/siw/siw_main.c:71 [inline] siw_newlink+0x77c/0xb84 drivers/infiniband/sw/siw/siw_main.c:430 nldev_newlink+0x484/0x558 drivers/infiniband/core/nldev.c:1796 rdma_nl_rcv_msg drivers/infiniband/core/netlink.c:-1 [inline] rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline] rdma_nl_rcv+0x5c4/0x858 drivers/infiniband/core/netlink.c:259 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x668/0x8a4 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x708/0xaa4 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] ____sys_sendmsg+0x578/0x890 net/socket.c:2566 ___sys_sendmsg net/socket.c:2620 [inline] __sys_sendmsg+0x238/0x304 net/socket.c:2652 __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2655 __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 -> #2 (lock#7){+.+.}-{4:4}: __mutex_lock_common+0x1f0/0x2604 kernel/locking/mutex.c:601 __mutex_lock kernel/locking/mutex.c:746 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:798 cma_init+0x2c/0x158 drivers/infiniband/core/cma.c:5468 do_one_initcall+0x254/0xaa4 init/main.c:1257 do_initcall_level+0x154/0x214 init/main.c:1319 do_initcalls+0x84/0xf4 init/main.c:1335 do_basic_setup+0x8c/0xa0 init/main.c:1354 kernel_init_freeable+0x320/0x474 init/main.c:1567 kernel_init+0x24/0x2a0 init/main.c:1457 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 -> #1 (rtnl_mutex){+.+.}-{4:4}: __mutex_lock_common+0x1f0/0x2604 kernel/locking/mutex.c:601 __mutex_lock kernel/locking/mutex.c:746 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:798 rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 do_ip_setsockopt+0xd5c/0x32c0 net/ipv4/ip_sockglue.c:1077 ip_setsockopt+0x80/0x128 net/ipv4/ip_sockglue.c:1417 tcp_setsockopt+0xcc/0xe8 net/ipv4/tcp.c:4077 sock_common_setsockopt+0xb0/0xcc net/core/sock.c:3894 smc_setsockopt+0x1f8/0xd0c net/smc/af_smc.c:3081 do_sock_setsockopt+0x2a0/0x4e0 net/socket.c:2296 __sys_setsockopt net/socket.c:2321 [inline] __do_sys_setsockopt net/socket.c:2327 [inline] __se_sys_setsockopt net/socket.c:2324 [inline] __arm64_sys_setsockopt+0x170/0x1e0 net/socket.c:2324 __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 (&smc->clcsock_release_lock){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x17b8/0x32c4 kernel/locking/lockdep.c:5235 lock_acquire+0x150/0x2e8 kernel/locking/lockdep.c:5866 __mutex_lock_common+0x1f0/0x2604 kernel/locking/mutex.c:601 __mutex_lock kernel/locking/mutex.c:746 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:798 smc_switch_to_fallback+0x48/0xa7c net/smc/af_smc.c:903 smc_sendmsg+0xfc/0x9f8 net/smc/af_smc.c:2781 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] __sys_sendto+0x360/0x4d8 net/socket.c:2180 __do_sys_sendto net/socket.c:2187 [inline] __se_sys_sendto net/socket.c:2183 [inline] __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2183 __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: &smc->clcsock_release_lock --> lock#7 --> sk_lock-AF_INET Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sk_lock-AF_INET); lock(lock#7); lock(sk_lock-AF_INET); lock(&smc->clcsock_release_lock); *** DEADLOCK *** 1 lock held by syz.1.203/7720: #0: ffff0000c4c70258 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1651 [inline] #0: ffff0000c4c70258 (sk_lock-AF_INET){+.+.}-{0:0}, at: smc_sendmsg+0x60/0x9f8 net/smc/af_smc.c:2775 stack backtrace: CPU: 0 UID: 0 PID: 7720 Comm: syz.1.203 Not tainted 6.15.0-rc2-syzkaller-gc72692105976 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (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+0x32c/0x334 kernel/locking/lockdep.c:2079 check_noncircular+0x15c/0x178 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x17b8/0x32c4 kernel/locking/lockdep.c:5235 lock_acquire+0x150/0x2e8 kernel/locking/lockdep.c:5866 __mutex_lock_common+0x1f0/0x2604 kernel/locking/mutex.c:601 __mutex_lock kernel/locking/mutex.c:746 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:798 smc_switch_to_fallback+0x48/0xa7c net/smc/af_smc.c:903 smc_sendmsg+0xfc/0x9f8 net/smc/af_smc.c:2781 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] __sys_sendto+0x360/0x4d8 net/socket.c:2180 __do_sys_sendto net/socket.c:2187 [inline] __se_sys_sendto net/socket.c:2183 [inline] __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2183 __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