======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc1-syzkaller-g245aece3750d #0 Not tainted
------------------------------------------------------
syz.5.1525/10369 is trying to acquire lock:
ffffffff898011c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x22/0x2a net/core/rtnetlink.c:79
but task is already holding lock:
ffffaf802fdf9628 (&smc->clcsock_release_lock){+.+.}-{4:4}, at: smc_setsockopt+0x112/0xd4e net/smc/af_smc.c:3073
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&smc->clcsock_release_lock){+.+.}-{4:4}:
lock_acquire kernel/locking/lockdep.c:5851 [inline]
lock_acquire+0x36a/0xb7c kernel/locking/lockdep.c:5816
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x166/0x1230 kernel/locking/mutex.c:730
mutex_lock_nested+0x14/0x1c kernel/locking/mutex.c:782
smc_switch_to_fallback+0x3e/0xa96 net/smc/af_smc.c:903
smc_sendmsg+0x14c/0xd12 net/smc/af_smc.c:2781
sock_sendmsg_nosec net/socket.c:713 [inline]
__sock_sendmsg+0xcc/0x160 net/socket.c:728
__sys_sendto+0x27a/0x34c net/socket.c:2182
__do_sys_sendto net/socket.c:2189 [inline]
__se_sys_sendto net/socket.c:2185 [inline]
__riscv_sys_sendto+0xc0/0x158 net/socket.c:2185
syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:90
do_trap_ecall_u+0x1aa/0x216 arch/riscv/kernel/traps.c:331
handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197
-> #1 (sk_lock-AF_INET){+.+.}-{0:0}:
lock_acquire kernel/locking/lockdep.c:5851 [inline]
lock_acquire+0x36a/0xb7c kernel/locking/lockdep.c:5816
lock_sock_nested+0x38/0xf6 net/core/sock.c:3645
lock_sock include/net/sock.h:1624 [inline]
sockopt_lock_sock net/core/sock.c:1133 [inline]
sockopt_lock_sock+0x62/0x82 net/core/sock.c:1124
do_ip_setsockopt+0x11c/0x32ee net/ipv4/ip_sockglue.c:1078
ip_setsockopt+0x52/0xe6 net/ipv4/ip_sockglue.c:1417
raw_setsockopt+0xc8/0x286 net/ipv4/raw.c:845
sock_common_setsockopt+0x90/0xc0 net/core/sock.c:3837
do_sock_setsockopt+0x20a/0x402 net/socket.c:2298
__sys_setsockopt+0x140/0x1cc net/socket.c:2323
__do_sys_setsockopt net/socket.c:2329 [inline]
__se_sys_setsockopt net/socket.c:2326 [inline]
__riscv_sys_setsockopt+0xa6/0x114 net/socket.c:2326
syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:90
do_trap_ecall_u+0x1aa/0x216 arch/riscv/kernel/traps.c:331
handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197
-> #0 (rtnl_mutex){+.+.}-{4:4}:
check_noncircular+0x2ba/0x354 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+0x2e4e/0x8594 kernel/locking/lockdep.c:5228
lock_acquire kernel/locking/lockdep.c:5851 [inline]
lock_acquire+0x36a/0xb7c kernel/locking/lockdep.c:5816
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x166/0x1230 kernel/locking/mutex.c:730
mutex_lock_nested+0x14/0x1c kernel/locking/mutex.c:782
rtnl_lock+0x22/0x2a net/core/rtnetlink.c:79
ip_mroute_setsockopt+0x110/0x1276 net/ipv4/ipmr.c:1396
do_ip_setsockopt+0x24a/0x32ee net/ipv4/ip_sockglue.c:948
ip_setsockopt+0x52/0xe6 net/ipv4/ip_sockglue.c:1417
tcp_setsockopt+0x8e/0xe0 net/ipv4/tcp.c:4030
sock_common_setsockopt+0x90/0xc0 net/core/sock.c:3837
smc_setsockopt+0x196/0xd4e net/smc/af_smc.c:3081
do_sock_setsockopt+0x20a/0x402 net/socket.c:2298
__sys_setsockopt+0x140/0x1cc net/socket.c:2323
__do_sys_setsockopt net/socket.c:2329 [inline]
__se_sys_setsockopt net/socket.c:2326 [inline]
__riscv_sys_setsockopt+0xa6/0x114 net/socket.c:2326
syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:90
do_trap_ecall_u+0x1aa/0x216 arch/riscv/kernel/traps.c:331
handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197
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.5.1525/10369:
#0: ffffaf802fdf9628 (&smc->clcsock_release_lock){+.+.}-{4:4}, at: smc_setsockopt+0x112/0xd4e net/smc/af_smc.c:3073
stack backtrace:
CPU: 1 UID: 0 PID: 10369 Comm: syz.5.1525 Not tainted 6.14.0-rc1-syzkaller-g245aece3750d #0
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff80074518>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:132
[<ffffffff80003206>] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:138
[<ffffffff8005fa4c>] __dump_stack lib/dump_stack.c:94 [inline]
[<ffffffff8005fa4c>] dump_stack_lvl+0x12e/0x1a6 lib/dump_stack.c:120
[<ffffffff8005fae0>] dump_stack+0x1c/0x24 lib/dump_stack.c:129
[<ffffffff802bbf48>] print_circular_bug+0x3a2/0x42c kernel/locking/lockdep.c:2076
[<ffffffff802bc28c>] check_noncircular+0x2ba/0x354 kernel/locking/lockdep.c:2208
[<ffffffff802c3fc0>] check_prev_add kernel/locking/lockdep.c:3163 [inline]
[<ffffffff802c3fc0>] check_prevs_add kernel/locking/lockdep.c:3282 [inline]
[<ffffffff802c3fc0>] validate_chain kernel/locking/lockdep.c:3906 [inline]
[<ffffffff802c3fc0>] __lock_acquire+0x2e4e/0x8594 kernel/locking/lockdep.c:5228
[<ffffffff802cbb4e>] lock_acquire kernel/locking/lockdep.c:5851 [inline]
[<ffffffff802cbb4e>] lock_acquire+0x36a/0xb7c kernel/locking/lockdep.c:5816
[<ffffffff86253dc4>] __mutex_lock_common kernel/locking/mutex.c:585 [inline]
[<ffffffff86253dc4>] __mutex_lock+0x166/0x1230 kernel/locking/mutex.c:730
[<ffffffff86254ea2>] mutex_lock_nested+0x14/0x1c kernel/locking/mutex.c:782
[<ffffffff84fd97e0>] rtnl_lock+0x22/0x2a net/core/rtnetlink.c:79
[<ffffffff85804566>] ip_mroute_setsockopt+0x110/0x1276 net/ipv4/ipmr.c:1396
[<ffffffff855e5e38>] do_ip_setsockopt+0x24a/0x32ee net/ipv4/ip_sockglue.c:948
[<ffffffff855e8f2e>] ip_setsockopt+0x52/0xe6 net/ipv4/ip_sockglue.c:1417
[<ffffffff8562cb6a>] tcp_setsockopt+0x8e/0xe0 net/ipv4/tcp.c:4030
[<ffffffff84edf7d4>] sock_common_setsockopt+0x90/0xc0 net/core/sock.c:3837
[<ffffffff85ef0e20>] smc_setsockopt+0x196/0xd4e net/smc/af_smc.c:3081
[<ffffffff84ed0db2>] do_sock_setsockopt+0x20a/0x402 net/socket.c:2298
[<ffffffff84edc1b4>] __sys_setsockopt+0x140/0x1cc net/socket.c:2323
[<ffffffff84edc2e6>] __do_sys_setsockopt net/socket.c:2329 [inline]
[<ffffffff84edc2e6>] __se_sys_setsockopt net/socket.c:2326 [inline]
[<ffffffff84edc2e6>] __riscv_sys_setsockopt+0xa6/0x114 net/socket.c:2326
[<ffffffff80072b1e>] syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:90
[<ffffffff86242a5a>] do_trap_ecall_u+0x1aa/0x216 arch/riscv/kernel/traps.c:331
[<ffffffff86268776>] handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197