netlink: 12 bytes leftover after parsing attributes in process `syz.8.1692'.
======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc2-syzkaller-00228-g04f41cbf03ec #0 Not tainted
------------------------------------------------------
syz.8.1692/13078 is trying to acquire lock:
ffffffff8fef7d68 (rtnl_mutex){+.+.}-{4:4}, at: ip_mroute_setsockopt+0x121/0x1440 net/ipv4/ipmr.c:1396
but task is already holding lock:
ffff88806a3a1628 (&smc->clcsock_release_lock){+.+.}-{4:4}, at: smc_setsockopt+0x101/0xa00 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}:
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19b/0xb10 kernel/locking/mutex.c:730
smc_switch_to_fallback+0x2d/0xa00 net/smc/af_smc.c:903
smc_sendmsg+0x13d/0x520 net/smc/af_smc.c:2781
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:733 [inline]
__sys_sendto+0x48b/0x4f0 net/socket.c:2187
__do_sys_sendto net/socket.c:2194 [inline]
__se_sys_sendto net/socket.c:2190 [inline]
__x64_sys_sendto+0xe0/0x1c0 net/socket.c:2190
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (sk_lock-AF_INET){+.+.}-{0:0}:
lock_sock_nested+0x3a/0xf0 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+0x54/0x70 net/core/sock.c:1124
do_ip_setsockopt+0x101/0x3680 net/ipv4/ip_sockglue.c:1078
ip_setsockopt+0x59/0xf0 net/ipv4/ip_sockglue.c:1417
raw_setsockopt+0xb8/0x290 net/ipv4/raw.c:845
do_sock_setsockopt+0x225/0x480 net/socket.c:2303
__sys_setsockopt+0x1a0/0x230 net/socket.c:2328
__do_sys_setsockopt net/socket.c:2334 [inline]
__se_sys_setsockopt net/socket.c:2331 [inline]
__x64_sys_setsockopt+0xbd/0x160 net/socket.c:2331
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (rtnl_mutex){+.+.}-{4:4}:
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+0x249e/0x3c40 kernel/locking/lockdep.c:5228
lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19b/0xb10 kernel/locking/mutex.c:730
ip_mroute_setsockopt+0x121/0x1440 net/ipv4/ipmr.c:1396
do_ip_setsockopt+0x2e8/0x3680 net/ipv4/ip_sockglue.c:948
ip_setsockopt+0x59/0xf0 net/ipv4/ip_sockglue.c:1417
tcp_setsockopt+0xa7/0x100 net/ipv4/tcp.c:4030
smc_setsockopt+0x1b7/0xa00 net/smc/af_smc.c:3081
do_sock_setsockopt+0x225/0x480 net/socket.c:2303
__sys_setsockopt+0x1a0/0x230 net/socket.c:2328
__do_sys_setsockopt net/socket.c:2334 [inline]
__se_sys_setsockopt net/socket.c:2331 [inline]
__x64_sys_setsockopt+0xbd/0x160 net/socket.c:2331
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
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.8.1692/13078:
#0: ffff88806a3a1628 (&smc->clcsock_release_lock){+.+.}-{4:4}, at: smc_setsockopt+0x101/0xa00 net/smc/af_smc.c:3073
stack backtrace:
CPU: 1 UID: 0 PID: 13078 Comm: syz.8.1692 Not tainted 6.14.0-rc2-syzkaller-00228-g04f41cbf03ec #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_circular_bug+0x490/0x760 kernel/locking/lockdep.c:2076
check_noncircular+0x31a/0x400 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+0x249e/0x3c40 kernel/locking/lockdep.c:5228
lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0x19b/0xb10 kernel/locking/mutex.c:730
ip_mroute_setsockopt+0x121/0x1440 net/ipv4/ipmr.c:1396
do_ip_setsockopt+0x2e8/0x3680 net/ipv4/ip_sockglue.c:948
ip_setsockopt+0x59/0xf0 net/ipv4/ip_sockglue.c:1417
tcp_setsockopt+0xa7/0x100 net/ipv4/tcp.c:4030
smc_setsockopt+0x1b7/0xa00 net/smc/af_smc.c:3081
do_sock_setsockopt+0x225/0x480 net/socket.c:2303
__sys_setsockopt+0x1a0/0x230 net/socket.c:2328
__do_sys_setsockopt net/socket.c:2334 [inline]
__se_sys_setsockopt net/socket.c:2331 [inline]
__x64_sys_setsockopt+0xbd/0x160 net/socket.c:2331
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f676f38cde9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f676d1f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f676f5a5fa0 RCX: 00007f676f38cde9
RDX: 00000000000000cc RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f676f40e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f676f5a5fa0 R15: 00007fffbb40ba18
tipc: Started in network mode
tipc: Node identity aaaaaaaaaa1a, cluster identity 4711
tipc: Enabled bearer , priority 0
futex_wake_op: syz.8.1692 tries to shift op by -1; fix this program