================================ WARNING: inconsistent lock state 5.5.0-next-20200207-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.0/12459 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff8880a26189c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: spin_lock include/linux/spinlock.h:338 [inline] ffff8880a26189c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_one_client_conn net/rxrpc/conn_client.c:948 [inline] ffff8880a26189c8 (&(&local->client_conns_lock)->rlock){+.?.}, at: rxrpc_put_client_conn+0x6ed/0xc90 net/rxrpc/conn_client.c:1001 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:338 [inline] rxrpc_get_client_conn net/rxrpc/conn_client.c:304 [inline] rxrpc_connect_call+0x358/0x4e30 net/rxrpc/conn_client.c:701 rxrpc_new_client_call+0x9c0/0x1ad0 net/rxrpc/call_object.c:290 rxrpc_new_client_call_for_sendmsg net/rxrpc/sendmsg.c:595 [inline] rxrpc_do_sendmsg+0xffa/0x1d5f net/rxrpc/sendmsg.c:652 rxrpc_sendmsg+0x4d6/0x5f0 net/rxrpc/af_rxrpc.c:586 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:672 ____sys_sendmsg+0x358/0x880 net/socket.c:2343 ___sys_sendmsg+0x100/0x170 net/socket.c:2397 __sys_sendmmsg+0x1bf/0x4d0 net/socket.c:2487 __do_sys_sendmmsg net/socket.c:2516 [inline] __se_sys_sendmmsg net/socket.c:2513 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2513 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe irq event stamp: 10326 hardirqs last enabled at (10326): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (10326): [] _raw_spin_unlock_irqrestore+0x66/0xe0 kernel/locking/spinlock.c:191 hardirqs last disabled at (10325): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (10325): [] _raw_spin_lock_irqsave+0x6f/0xcd kernel/locking/spinlock.c:159 softirqs last enabled at (9798): [] __do_softirq+0x6cd/0x98c kernel/softirq.c:319 softirqs last disabled at (10309): [] invoke_softirq kernel/softirq.c:373 [inline] softirqs last disabled at (10309): [] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 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 *** 3 locks held by syz-executor.0/12459: #0: ffff88808e811878 (&bdev->bd_mutex){+.+.}, at: __blkdev_put+0xbb/0x790 fs/block_dev.c:1883 #1: ffffffff89bac700 (rcu_read_lock){....}, at: find_get_entries+0x12b/0xb00 mm/filemap.c:1746 #2: ffffffff89bac640 (rcu_callback){....}, at: rcu_do_batch kernel/rcu/tree.c:2176 [inline] #2: ffffffff89bac640 (rcu_callback){....}, at: rcu_core+0x562/0x1390 kernel/rcu/tree.c:2410 stack backtrace: CPU: 0 PID: 12459 Comm: syz-executor.0 Not tainted 5.5.0-next-20200207-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 print_usage_bug.cold+0x327/0x378 kernel/locking/lockdep.c:3100 valid_state kernel/locking/lockdep.c:3111 [inline] mark_lock_irq kernel/locking/lockdep.c:3308 [inline] mark_lock+0xbb4/0x1220 kernel/locking/lockdep.c:3665 mark_usage kernel/locking/lockdep.c:3565 [inline] __lock_acquire+0x1e8e/0x4a00 kernel/locking/lockdep.c:3908 lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4484 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:338 [inline] rxrpc_put_one_client_conn net/rxrpc/conn_client.c:948 [inline] rxrpc_put_client_conn+0x6ed/0xc90 net/rxrpc/conn_client.c:1001 rxrpc_put_connection net/rxrpc/ar-internal.h:965 [inline] rxrpc_rcu_destroy_call+0xbd/0x200 net/rxrpc/call_object.c:572 rcu_do_batch kernel/rcu/tree.c:2186 [inline] rcu_core+0x5e1/0x1390 kernel/rcu/tree.c:2410 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2419 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x4f/0x80 kernel/locking/spinlock.c:199 Code: c0 88 b5 b3 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 33 48 83 3d 32 a1 c3 01 00 74 20 fb 66 0f 1f 44 00 00 01 00 00 00 e8 d7 d0 60 f9 65 8b 05 18 0a 12 78 85 c0 74 06 41 RSP: 0018:ffffc90004cc7520 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13676b1 RBX: ffff888059106440 RCX: 0000000000000006 RDX: dffffc0000000000 RSI: ffff888059106d08 RDI: ffff888059106cdc RBP: ffffc90004cc7528 R08: 1ffffffff16a3975 R09: fffffbfff16a3976 R10: fffffbfff16a3975 R11: ffffffff8b51cbaf R12: ffff8880ae837540 R13: ffff888097b84440 R14: 0000000000000000 R15: 0000000000000001 finish_lock_switch kernel/sched/core.c:3130 [inline] finish_task_switch+0x147/0x750 kernel/sched/core.c:3230 context_switch kernel/sched/core.c:3394 [inline] __schedule+0x93c/0x1f90 kernel/sched/core.c:4092 preempt_schedule_irq+0xb5/0x160 kernel/sched/core.c:4349 retint_kernel+0x1b/0x2b RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:lock_is_held_type+0x272/0x320 kernel/locking/lockdep.c:4523 Code: ff df c7 83 9c 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 88 00 00 00 48 83 3d 1e 11 59 08 00 74 31 48 8b 7d c0 57 9d <0f> 1f 44 00 00 48 83 c4 20 44 89 e0 5b 41 5c 41 5d 41 5e 41 5f 5d RSP: 0018:ffffc90004cc7740 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13676af RBX: ffff888059106440 RCX: ffff888059106ce0 RDX: dffffc0000000000 RSI: ffff88808e811bc0 RDI: 0000000000000286 RBP: ffffc90004cc7788 R08: ffff888059106440 R09: ffffed1015d0707c R10: ffffed1015d0707b R11: ffff8880ae8383db R12: 0000000000000000 R13: ffff888059106d08 R14: ffff88808e811bc0 R15: 0000000000000002 lock_is_held include/linux/lockdep.h:361 [inline] xa_entry include/linux/xarray.h:1180 [inline] xas_next_entry include/linux/xarray.h:1604 [inline] find_get_entries+0x7c7/0xb00 mm/filemap.c:1714 pagevec_lookup_entries+0x3a/0x80 mm/swap.c:1016 truncate_inode_pages_range+0x20c/0x1980 mm/truncate.c:329 truncate_inode_pages+0x25/0x30 mm/truncate.c:476 kill_bdev+0xdc/0x110 fs/block_dev.c:86 __blkdev_put+0x1b7/0x790 fs/block_dev.c:1890 blkdev_put+0x98/0x560 fs/block_dev.c:1958 kill_block_super+0xd0/0x100 fs/super.c:1447 deactivate_locked_super+0x95/0x100 fs/super.c:335 deactivate_super fs/super.c:366 [inline] deactivate_super+0x1bd/0x1e0 fs/super.c:362 cleanup_mnt+0x351/0x4c0 fs/namespace.c:1102 __cleanup_mnt+0x16/0x20 fs/namespace.c:1109 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b399 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8450ba5c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f8450ba66d4 RCX: 000000000045b399 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000540 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000c07 R14: 00000000004cce86 R15: 000000000075bf2c