====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc2-syzkaller-gc72692105976 #0 Not tainted ------------------------------------------------------ syz.4.1680/11837 is trying to acquire lock: ffff0000f04e0aa8 (&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: ffff0000f04e0258 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1651 [inline] ffff0000f04e0258 (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: -> #2 (sk_lock-AF_INET){+.+.}-{0:0}: lock_sock_nested net/core/sock.c:3702 [inline] lock_sock include/net/sock.h:1651 [inline] sockopt_lock_sock+0x88/0x148 net/core/sock.c:1148 do_ip_setsockopt+0x138c/0x32c0 net/ipv4/ip_sockglue.c:1078 ip_setsockopt+0x80/0x128 net/ipv4/ip_sockglue.c:1417 raw_setsockopt+0x104/0x2a4 net/ipv4/raw.c:845 sock_common_setsockopt+0xb0/0xcc net/core/sock.c:3894 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 -> #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 --> rtnl_mutex --> sk_lock-AF_INET Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sk_lock-AF_INET); lock(rtnl_mutex); lock(sk_lock-AF_INET); lock(&smc->clcsock_release_lock); *** DEADLOCK *** 1 lock held by syz.4.1680/11837: #0: ffff0000f04e0258 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1651 [inline] #0: ffff0000f04e0258 (sk_lock-AF_INET){+.+.}-{0:0}, at: smc_sendmsg+0x60/0x9f8 net/smc/af_smc.c:2775 stack backtrace: CPU: 1 UID: 0 PID: 11837 Comm: syz.4.1680 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