================================ WARNING: inconsistent lock state 6.1.0-rc5-syzkaller-00146-g30f158740984 #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-R} usage. kworker/u4:4/56 [HC0[0]:SC1[3]:HE1:SE0] takes: ffff88807efb4bb8 (k-clock-AF_INET){+++-}-{2:2}, at: smc_fback_state_change+0x20/0xc0 net/smc/af_smc.c:799 {SOFTIRQ-ON-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 __raw_write_lock include/linux/rwlock_api_smp.h:209 [inline] _raw_write_lock+0x2e/0x40 kernel/locking/spinlock.c:300 l2tp_tunnel_register+0x126/0x1210 net/l2tp/l2tp_core.c:1477 l2tp_nl_cmd_tunnel_create+0x3d6/0x8b0 net/l2tp/l2tp_netlink.c:245 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:756 genl_family_rcv_msg net/netlink/genetlink.c:833 [inline] genl_rcv_msg+0x445/0x780 net/netlink/genetlink.c:850 netlink_rcv_skb+0x157/0x430 net/netlink/af_netlink.c:2540 genl_rcv+0x28/0x40 net/netlink/genetlink.c:861 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xd3/0x120 net/socket.c:734 ____sys_sendmsg+0x712/0x8c0 net/socket.c:2482 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2536 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2565 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd irq event stamp: 1130466 hardirqs last enabled at (1130466): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (1130466): [] _raw_spin_unlock_irqrestore+0x54/0x70 kernel/locking/spinlock.c:194 hardirqs last disabled at (1130465): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (1130465): [] _raw_spin_lock_irqsave+0x52/0x60 kernel/locking/spinlock.c:162 softirqs last enabled at (1130404): [] rcu_read_unlock_bh include/linux/rcupdate.h:804 [inline] softirqs last enabled at (1130404): [] ip_finish_output2+0x7ae/0x2180 net/ipv4/ip_output.c:229 softirqs last disabled at (1130405): [] do_softirq.part.0+0xde/0x130 kernel/softirq.c:472 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(k-clock-AF_INET); lock(k-clock-AF_INET); *** DEADLOCK *** 7 locks held by kworker/u4:4/56: #0: ffff8880285fc938 ((wq_completion)krdsd){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880285fc938 ((wq_completion)krdsd){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff8880285fc938 ((wq_completion)krdsd){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff8880285fc938 ((wq_completion)krdsd){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline] #0: ffff8880285fc938 ((wq_completion)krdsd){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline] #0: ffff8880285fc938 ((wq_completion)krdsd){+.+.}-{0:0}, at: process_one_work+0x86d/0x1710 kernel/workqueue.c:2260 #1: ffffc90001577da8 ((work_completion)(&rtn->rds_tcp_accept_w)){+.+.}-{0:0}, at: process_one_work+0x8a1/0x1710 kernel/workqueue.c:2264 #2: ffff88814ab15a70 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1721 [inline] #2: ffff88814ab15a70 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: tcp_close+0x22/0xc0 net/ipv4/tcp.c:3031 #3: ffffffff8c58fc40 (rcu_read_lock){....}-{1:2}, at: read_pnet include/net/net_namespace.h:369 [inline] #3: ffffffff8c58fc40 (rcu_read_lock){....}-{1:2}, at: sock_net include/net/sock.h:645 [inline] #3: ffffffff8c58fc40 (rcu_read_lock){....}-{1:2}, at: __ip_queue_xmit+0x41/0x1bf0 net/ipv4/ip_output.c:457 #4: ffffffff8c58fc40 (rcu_read_lock){....}-{1:2}, at: __skb_unlink include/linux/skbuff.h:2324 [inline] #4: ffffffff8c58fc40 (rcu_read_lock){....}-{1:2}, at: __skb_dequeue include/linux/skbuff.h:2339 [inline] #4: ffffffff8c58fc40 (rcu_read_lock){....}-{1:2}, at: process_backlog+0x38f/0x810 net/core/dev.c:5929 #5: ffffffff8c58fc40 (rcu_read_lock){....}-{1:2}, at: __skb_pull include/linux/skbuff.h:2609 [inline] #5: ffffffff8c58fc40 (rcu_read_lock){....}-{1:2}, at: ip_local_deliver_finish+0x20a/0x4c0 net/ipv4/ip_input.c:230 #6: ffff88807efb48b0 (k-slock-AF_INET/1){+.-.}-{2:2}, at: tcp_v4_rcv+0x3429/0x3980 net/ipv4/tcp_ipv4.c:2098 stack backtrace: CPU: 0 PID: 56 Comm: kworker/u4:4 Not tainted 6.1.0-rc5-syzkaller-00146-g30f158740984 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: krdsd rds_tcp_accept_worker Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_usage_bug kernel/locking/lockdep.c:3963 [inline] valid_state kernel/locking/lockdep.c:3975 [inline] mark_lock_irq kernel/locking/lockdep.c:4178 [inline] mark_lock.part.0.cold+0x18/0xd8 kernel/locking/lockdep.c:4634 mark_lock kernel/locking/lockdep.c:4598 [inline] mark_usage kernel/locking/lockdep.c:4521 [inline] __lock_acquire+0x14dc/0x56d0 kernel/locking/lockdep.c:5009 lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 __raw_read_lock_bh include/linux/rwlock_api_smp.h:176 [inline] _raw_read_lock_bh+0x3f/0x70 kernel/locking/spinlock.c:252 smc_fback_state_change+0x20/0xc0 net/smc/af_smc.c:799 tcp_done+0x1cc/0x340 net/ipv4/tcp.c:4650 tcp_reset+0x1a6/0x540 net/ipv4/tcp_input.c:4338 tcp_validate_incoming+0x865/0x1c80 net/ipv4/tcp_input.c:5805 tcp_rcv_established+0x63f/0x2230 net/ipv4/tcp_input.c:5990 tcp_v4_do_rcv+0x670/0x9b0 net/ipv4/tcp_ipv4.c:1681 tcp_v4_rcv+0x36ad/0x3980 net/ipv4/tcp_ipv4.c:2102 ip_protocol_deliver_rcu+0x9f/0x7c0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2ec/0x4c0 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:302 [inline] NF_HOOK include/linux/netfilter.h:296 [inline] ip_local_deliver+0x1ae/0x200 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:455 [inline] ip_rcv_finish+0x1cf/0x2f0 net/ipv4/ip_input.c:444 NF_HOOK include/linux/netfilter.h:302 [inline] NF_HOOK include/linux/netfilter.h:296 [inline] ip_rcv+0xae/0xd0 net/ipv4/ip_input.c:564 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5489 __netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5603 process_backlog+0x3e4/0x810 net/core/dev.c:5931 __napi_poll+0xb8/0x770 net/core/dev.c:6498 napi_poll net/core/dev.c:6565 [inline] net_rx_action+0xa00/0xde0 net/core/dev.c:6676 __do_softirq+0x1fb/0xadc kernel/softirq.c:571 do_softirq.part.0+0xde/0x130 kernel/softirq.c:472 do_softirq kernel/softirq.c:464 [inline] __local_bh_enable_ip+0x106/0x130 kernel/softirq.c:396 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:808 [inline] ip_finish_output2+0x7dc/0x2180 net/ipv4/ip_output.c:229 __ip_finish_output net/ipv4/ip_output.c:306 [inline] __ip_finish_output+0x396/0x650 net/ipv4/ip_output.c:288 ip_finish_output+0x31/0x280 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip_output+0x1a3/0x320 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:445 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0x8e2/0x1bf0 net/ipv4/ip_output.c:532 __tcp_transmit_skb+0x1967/0x3800 net/ipv4/tcp_output.c:1402 tcp_transmit_skb net/ipv4/tcp_output.c:1420 [inline] tcp_send_active_reset+0x44a/0x930 net/ipv4/tcp_output.c:3462 __tcp_close+0x381/0xf50 net/ipv4/tcp.c:2908 tcp_close+0x2d/0xc0 net/ipv4/tcp.c:3032 inet_release+0x132/0x270 net/ipv4/af_inet.c:428 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:488 __sock_release net/socket.c:650 [inline] sock_release+0x8b/0x1b0 net/socket.c:678 rds_tcp_accept_one+0x330/0xd10 net/rds/tcp_listen.c:229 rds_tcp_accept_worker+0x59/0x80 net/rds/tcp.c:529 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306