======================================================
WARNING: possible circular locking dependency detected
6.15.0-rc2-syzkaller-gc72692105976 #0 Not tainted
------------------------------------------------------
syz.1.678/8740 is trying to acquire lock:
ffff0000f47e8aa8 (&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:
ffff0000f47e8258 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1651 [inline]
ffff0000f47e8258 (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
start_sync_thread+0xe0/0x24bc net/netfilter/ipvs/ip_vs_sync.c:1761
do_ip_vs_set_ctl+0x558/0xd84 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: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.1.678/8740:
#0: ffff0000f47e8258 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1651 [inline]
#0: ffff0000f47e8258 (sk_lock-AF_INET){+.+.}-{0:0}, at: smc_sendmsg+0x60/0x9f8 net/smc/af_smc.c:2775
stack backtrace:
CPU: 1 UID: 0 PID: 8740 Comm: syz.1.678 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/0x1028 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