L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details. ================================ WARNING: inconsistent lock state 4.19.106-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. kworker/u4:0/7 [HC0[0]:SC1[1]:HE1:SE0] takes: 00000000c288f999 (&(&local->client_conns_lock)->rlock){+.?.}, at: spin_lock include/linux/spinlock.h:329 [inline] 00000000c288f999 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_one_client_conn net/rxrpc/conn_client.c:949 [inline] 00000000c288f999 (&(&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: 2298528 hardirqs last enabled at (2298528): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (2298528): [] _raw_spin_unlock_irqrestore+0x67/0xe0 kernel/locking/spinlock.c:184 hardirqs last disabled at (2298527): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (2298527): [] _raw_spin_lock_irqsave+0x66/0xbf kernel/locking/spinlock.c:152 softirqs last enabled at (2298506): [] get_next_corpse net/netfilter/nf_conntrack_core.c:1918 [inline] softirqs last enabled at (2298506): [] nf_ct_iterate_cleanup+0x1f1/0x4b0 net/netfilter/nf_conntrack_core.c:1951 softirqs last disabled at (2298509): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (2298509): [] 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/u4:0/7: #0: 00000000fe9331d0 ((wq_completion)"%s""netns"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 00000000fe9331d0 ((wq_completion)"%s""netns"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000fe9331d0 ((wq_completion)"%s""netns"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 00000000fe9331d0 ((wq_completion)"%s""netns"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 00000000fe9331d0 ((wq_completion)"%s""netns"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 00000000fe9331d0 ((wq_completion)"%s""netns"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 00000000fe9331d0 ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x81a/0x1640 kernel/workqueue.c:2124 #1: 000000002f42b840 (net_cleanup_work){+.+.}, at: process_one_work+0x84e/0x1640 kernel/workqueue.c:2128 #2: 000000008a64e798 (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x850 net/core/net_namespace.c:520 #3: 00000000efb831e5 (rcu_callback){....}, at: __rcu_reclaim kernel/rcu/rcu.h:226 [inline] #3: 00000000efb831e5 (rcu_callback){....}, at: rcu_do_batch kernel/rcu/tree.c:2584 [inline] #3: 00000000efb831e5 (rcu_callback){....}, at: invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline] #3: 00000000efb831e5 (rcu_callback){....}, at: __rcu_process_callbacks kernel/rcu/tree.c:2864 [inline] #3: 00000000efb831e5 (rcu_callback){....}, at: rcu_process_callbacks+0xbff/0x17f0 kernel/rcu/tree.c:2881 stack backtrace: CPU: 1 PID: 7 Comm: kworker/u4:0 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:should_resched arch/x86/include/asm/preempt.h:99 [inline] RIP: 0010:__local_bh_enable_ip+0x18d/0x270 kernel/softirq.c:196 Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 dd 00 00 00 48 83 3d 78 2b 74 07 00 0f 84 8d 00 00 00 fb 66 0f 1f 44 00 00 <65> 8b 05 1c c3 c3 7e 85 c0 74 7d 5b 5d 41 5c c3 80 3d 59 8d 48 08 RSP: 0018:ffff8880a9e8fb78 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1164ac3 RBX: 0000000000000200 RCX: 1ffff110153ced56 RDX: dffffc0000000000 RSI: ffff8880a9e76a90 RDI: ffff8880a9e76a3c RBP: ffffffff85ca21b1 R08: ffff8880a9e761c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a9e761c0 R13: 0000000000000001 R14: dffffc0000000000 R15: 0000000000000000 local_bh_enable include/linux/bottom_half.h:32 [inline] get_next_corpse net/netfilter/nf_conntrack_core.c:1928 [inline] nf_ct_iterate_cleanup+0x217/0x4b0 net/netfilter/nf_conntrack_core.c:1951 nf_conntrack_cleanup_net_list+0x7e/0x250 net/netfilter/nf_conntrack_core.c:2138 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 mmap: syz-executor.5 (8472) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.rst. IPVS: stopping backup sync thread 8479 ... nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: stopping backup sync thread 8482 ... IPVS: stopping backup sync thread 8489 ... IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: stopping backup sync thread 8494 ... IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: stopping backup sync thread 8518 ... IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: stopping backup sync thread 8522 ... IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: stopping backup sync thread 8526 ... IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: stopping backup sync thread 8530 ... IPVS: stopping backup sync thread 8535 ... IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: stopping backup sync thread 8555 ... IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: stopping backup sync thread 8564 ... IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: stopping backup sync thread 8572 ... IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: stopping backup sync thread 8600 ... IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: stopping backup sync thread 8607 ... IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: stopping backup sync thread 8616 ... IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: stopping backup sync thread 8621 ... IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: stopping backup sync thread 8729 ... IPVS: stopping backup sync thread 8772 ... IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: stopping backup sync thread 8776 ... IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0 IPVS: sync thread started: state = BACKUP, mcast_ifn = dummy0, syncid = 0, id = 0