================================ WARNING: inconsistent lock state 4.19.106-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. kworker/u4:7/9941 [HC0[0]:SC1[1]:HE1:SE0] takes: 00000000dcd24b96 (&(&local->client_conns_lock)->rlock){+.?.}, at: spin_lock include/linux/spinlock.h:329 [inline] 00000000dcd24b96 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_one_client_conn net/rxrpc/conn_client.c:949 [inline] 00000000dcd24b96 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_client_conn+0x666/0xc00 net/rxrpc/conn_client.c:1002 {SOFTIRQ-ON-W} state was registered at: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] rxrpc_get_client_conn net/rxrpc/conn_client.c:309 [inline] rxrpc_connect_call+0x301/0x4630 net/rxrpc/conn_client.c:702 rxrpc_new_client_call+0x8c6/0x1850 net/rxrpc/call_object.c:291 rxrpc_new_client_call_for_sendmsg net/rxrpc/sendmsg.c:596 [inline] rxrpc_do_sendmsg+0xf2e/0x1bc1 net/rxrpc/sendmsg.c:652 rxrpc_sendmsg+0x4a8/0x5b0 net/rxrpc/af_rxrpc.c:593 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:632 ___sys_sendmsg+0x3e2/0x920 net/socket.c:2115 __sys_sendmmsg+0x195/0x470 net/socket.c:2210 __do_sys_sendmmsg net/socket.c:2239 [inline] __se_sys_sendmmsg net/socket.c:2236 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe irq event stamp: 37293446 hardirqs last enabled at (37293446): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (37293446): [] _raw_spin_unlock_irqrestore+0x67/0xe0 kernel/locking/spinlock.c:184 hardirqs last disabled at (37293445): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (37293445): [] _raw_spin_lock_irqsave+0x66/0xbf kernel/locking/spinlock.c:152 softirqs last enabled at (37293372): [] __do_softirq+0x650/0x93c kernel/softirq.c:318 softirqs last disabled at (37293387): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (37293387): [] irq_exit+0x17b/0x1c0 kernel/softirq.c:412 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&(&local->client_conns_lock)->rlock); lock(&(&local->client_conns_lock)->rlock); *** DEADLOCK *** 4 locks held by kworker/u4:7/9941: #0: 0000000060677a62 ((wq_completion)"%s""netns"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 0000000060677a62 ((wq_completion)"%s""netns"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 0000000060677a62 ((wq_completion)"%s""netns"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 0000000060677a62 ((wq_completion)"%s""netns"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 0000000060677a62 ((wq_completion)"%s""netns"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 0000000060677a62 ((wq_completion)"%s""netns"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 0000000060677a62 ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x81a/0x1640 kernel/workqueue.c:2124 #1: 0000000097100b62 (net_cleanup_work){+.+.}, at: process_one_work+0x84e/0x1640 kernel/workqueue.c:2128 #2: 00000000ef0ad91f (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x850 net/core/net_namespace.c:520 #3: 0000000048d41b54 (rcu_callback){....}, at: __rcu_reclaim kernel/rcu/rcu.h:226 [inline] #3: 0000000048d41b54 (rcu_callback){....}, at: rcu_do_batch kernel/rcu/tree.c:2584 [inline] #3: 0000000048d41b54 (rcu_callback){....}, at: invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline] #3: 0000000048d41b54 (rcu_callback){....}, at: __rcu_process_callbacks kernel/rcu/tree.c:2864 [inline] #3: 0000000048d41b54 (rcu_callback){....}, at: rcu_process_callbacks+0xbff/0x17f0 kernel/rcu/tree.c:2881 stack backtrace: CPU: 0 PID: 9941 Comm: kworker/u4:7 Not tainted 4.19.106-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 print_usage_bug.cold+0x327/0x425 kernel/locking/lockdep.c:2540 valid_state kernel/locking/lockdep.c:2553 [inline] mark_lock_irq kernel/locking/lockdep.c:2747 [inline] mark_lock+0xc71/0x11b0 kernel/locking/lockdep.c:3127 mark_irqflags kernel/locking/lockdep.c:3005 [inline] __lock_acquire+0xc62/0x49c0 kernel/locking/lockdep.c:3368 lock_acquire+0x170/0x400 kernel/locking/lockdep.c:3903 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] rxrpc_put_one_client_conn net/rxrpc/conn_client.c:949 [inline] rxrpc_put_client_conn+0x666/0xc00 net/rxrpc/conn_client.c:1002 rxrpc_put_connection net/rxrpc/ar-internal.h:951 [inline] rxrpc_rcu_destroy_call+0xb6/0x1e0 net/rxrpc/call_object.c:657 __rcu_reclaim kernel/rcu/rcu.h:236 [inline] rcu_do_batch kernel/rcu/tree.c:2584 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2864 [inline] rcu_process_callbacks+0xb2d/0x17f0 kernel/rcu/tree.c:2881 __do_softirq+0x26c/0x93c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x17b/0x1c0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:544 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:lock_acquire+0x3e/0x400 kernel/locking/lockdep.c:3895 Code: 41 55 41 89 d5 41 54 41 89 f4 55 48 89 fd 53 65 48 8b 1c 25 40 ee 01 00 48 8d bb 7c 08 00 00 48 83 ec 20 48 89 fa 4c 89 0c 24 <48> c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 RSP: 0018:ffff88805fb37af8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffff8880a1208240 RCX: 0000000000000002 RDX: ffff8880a1208abc RSI: 0000000000000000 RDI: ffff8880a1208abc RBP: ffffffff88b92960 R08: 0000000000000000 R09: 0000000000000000 R10: ffffed1015cc4732 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000002 R15: dffffc0000000000 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:627 [inline] inet_twsk_purge+0x112/0x765 net/ipv4/inet_timewait_sock.c:267 ops_exit_list.isra.0+0xef/0x140 net/core/net_namespace.c:156 cleanup_net+0x3bf/0x850 net/core/net_namespace.c:553 process_one_work+0x91f/0x1640 kernel/workqueue.c:2153 worker_thread+0x96/0xe20 kernel/workqueue.c:2296 kthread+0x34a/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'. selinux_nlmsg_perm: 14 callbacks suppressed SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=3841 comm=syz-executor.3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=3841 comm=syz-executor.3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=3841 comm=syz-executor.3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=3841 comm=syz-executor.3 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=3841 comm=syz-executor.3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=3870 comm=syz-executor.3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=3841 comm=syz-executor.3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=3841 comm=syz-executor.3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=3841 comm=syz-executor.3 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=3870 comm=syz-executor.3 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'. XFS (loop2): Invalid superblock magic number XFS (loop2): Invalid superblock magic number XFS (loop2): Invalid superblock magic number XFS (loop2): Invalid superblock magic number vivid-000: kernel_thread() failed