================================ WARNING: inconsistent lock state 4.20.0-rc7-next-20181224 #188 Not tainted -------------------------------- inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage. syz-executor0/19970 [HC0[0]:SC0[0]:HE1:SE1] takes: 000000006a97b974 (slock-AF_NETROM){+.?.}, at: spin_lock include/linux/spinlock.h:329 [inline] 000000006a97b974 (slock-AF_NETROM){+.?.}, at: nr_find_socket+0x113/0x160 net/netrom/af_netrom.c:177 {IN-SOFTIRQ-W} state was registered at: lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3841 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2d/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] nr_find_listener net/netrom/af_netrom.c:156 [inline] nr_rx_frame+0x5f8/0x1da0 net/netrom/af_netrom.c:955 nr_loopback_timer+0x79/0x160 net/netrom/nr_loopback.c:62 call_timer_fn+0x272/0x920 kernel/time/timer.c:1325 expire_timers kernel/time/timer.c:1362 [inline] __run_timers+0x7e5/0xc70 kernel/time/timer.c:1681 run_timer_softirq+0x52/0xb0 kernel/time/timer.c:1694 __do_softirq+0x30c/0xb2e kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x17f/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1cb/0x760 arch/x86/kernel/apic/apic.c:1062 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 arch_local_irq_restore arch/x86/include/asm/paravirt.h:766 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0xaf/0xd0 kernel/locking/spinlock.c:184 try_to_wake_up+0x11c/0x1460 kernel/sched/core.c:2061 wake_up_process kernel/sched/core.c:2129 [inline] wake_up_q+0xa4/0x100 kernel/sched/core.c:440 __mutex_unlock_slowpath+0x43c/0x8c0 kernel/locking/mutex.c:1249 mutex_unlock+0xd/0x10 kernel/locking/mutex.c:713 pipe_unlock fs/pipe.c:77 [inline] pipe_wait+0x24f/0x2c0 fs/pipe.c:115 splice_from_pipe_next.part.11+0xed/0x340 fs/splice.c:567 splice_from_pipe_next fs/splice.c:546 [inline] __splice_from_pipe+0x10a/0x7c0 fs/splice.c:625 vmsplice_to_user fs/splice.c:1266 [inline] do_vmsplice.part.15+0x338/0x3d0 fs/splice.c:1344 do_vmsplice fs/splice.c:1338 [inline] __do_sys_vmsplice+0x251/0x2f0 fs/splice.c:1365 __se_sys_vmsplice fs/splice.c:1347 [inline] __x64_sys_vmsplice+0x97/0xf0 fs/splice.c:1347 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe irq event stamp: 1480 hardirqs last enabled at (1478): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (1479): [] __local_bh_enable_ip+0x120/0x260 kernel/softirq.c:171 softirqs last enabled at (1480): [] spin_unlock_bh include/linux/spinlock.h:374 [inline] softirqs last enabled at (1480): [] nr_find_socket+0x128/0x160 net/netrom/af_netrom.c:183 softirqs last disabled at (1410): [] spin_lock_bh include/linux/spinlock.h:334 [inline] softirqs last disabled at (1410): [] nr_find_socket+0x24/0x160 net/netrom/af_netrom.c:172 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(slock-AF_NETROM); lock(slock-AF_NETROM); *** DEADLOCK *** 1 lock held by syz-executor0/19970: #0: 000000006a97b974 (slock-AF_NETROM){+.?.}, at: spin_lock include/linux/spinlock.h:329 [inline] #0: 000000006a97b974 (slock-AF_NETROM){+.?.}, at: nr_find_socket+0x113/0x160 net/netrom/af_netrom.c:177 stack backtrace: CPU: 1 PID: 19970 Comm: syz-executor0 Not tainted 4.20.0-rc7-next-20181224 #188 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+0x1d3/0x2c6 lib/dump_stack.c:113 print_usage_bug.cold.63+0x320/0x41a kernel/locking/lockdep.c:2475 valid_state kernel/locking/lockdep.c:2488 [inline] mark_lock_irq kernel/locking/lockdep.c:2682 [inline] mark_lock+0x1114/0x1cc0 kernel/locking/lockdep.c:3062 mark_held_locks+0xc7/0x130 kernel/locking/lockdep.c:2740 __trace_hardirqs_on_caller kernel/locking/lockdep.c:2769 [inline] lockdep_hardirqs_on+0x421/0x5c0 kernel/locking/lockdep.c:2814 trace_hardirqs_on+0xbd/0x310 kernel/trace/trace_preemptirq.c:30 __local_bh_enable_ip+0x160/0x260 kernel/softirq.c:194 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline] _raw_spin_unlock_bh+0x30/0x40 kernel/locking/spinlock.c:200 spin_unlock_bh include/linux/spinlock.h:374 [inline] nr_find_socket+0x128/0x160 net/netrom/af_netrom.c:183 nr_find_next_circuit+0x71/0x90 net/netrom/af_netrom.c:225 nr_connect+0x6cb/0x1350 net/netrom/af_netrom.c:704 __sys_connect+0x37d/0x4c0 net/socket.c:1664 __do_sys_connect net/socket.c:1675 [inline] __se_sys_connect net/socket.c:1672 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1672 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457759 Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1fa01adc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457759 RDX: 0000000000000048 RSI: 0000000020000000 RDI: 0000000000000006 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1fa01ae6d4 R13: 00000000004bddbb R14: 00000000004cdee8 R15: 00000000ffffffff kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000601ee576): kobject_uevent_env kobject: 'loop1' (00000000601ee576): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (000000005ed15dc5): kobject_uevent_env kobject: 'loop3' (000000005ed15dc5): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (000000005ed15dc5): kobject_uevent_env kobject: 'loop3' (000000005ed15dc5): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (000000009b63a364): kobject_uevent_env kobject: 'loop4' (000000009b63a364): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop1' (00000000601ee576): kobject_uevent_env kobject: 'loop1' (00000000601ee576): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (0000000002979d2a): kobject_uevent_env kobject: 'loop0' (0000000002979d2a): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (00000000c31813a5): kobject_uevent_env kobject: 'loop2' (00000000c31813a5): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000002979d2a): kobject_uevent_env kobject: 'loop0' (0000000002979d2a): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (000000009b63a364): kobject_uevent_env kobject: 'loop4' (000000009b63a364): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000002979d2a): kobject_uevent_env kobject: 'loop0' (0000000002979d2a): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (000000005ed15dc5): kobject_uevent_env kobject: 'loop3' (000000005ed15dc5): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop1' (00000000601ee576): kobject_uevent_env kobject: 'loop1' (00000000601ee576): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (00000000c31813a5): kobject_uevent_env kobject: 'loop2' (00000000c31813a5): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000601ee576): kobject_uevent_env kobject: 'loop1' (00000000601ee576): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000601ee576): kobject_uevent_env kobject: 'loop1' (00000000601ee576): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (000000009b63a364): kobject_uevent_env kobject: 'loop4' (000000009b63a364): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (000000005ed15dc5): kobject_uevent_env kobject: 'loop3' (000000005ed15dc5): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (0000000002979d2a): kobject_uevent_env kobject: 'loop0' (0000000002979d2a): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (00000000c31813a5): kobject_uevent_env kobject: 'loop2' (00000000c31813a5): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium kobject: 'loop1' (00000000601ee576): kobject_uevent_env kobject: 'loop1' (00000000601ee576): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000002979d2a): kobject_uevent_env kobject: 'loop0' (0000000002979d2a): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000601ee576): kobject_uevent_env kobject: 'loop1' (00000000601ee576): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (0000000002979d2a): kobject_uevent_env kobject: 'loop0' (0000000002979d2a): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (000000009b63a364): kobject_uevent_env kobject: 'loop4' (000000009b63a364): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (000000005ed15dc5): kobject_uevent_env kobject: 'loop3' (000000005ed15dc5): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (00000000c31813a5): kobject_uevent_env kobject: 'loop2' (00000000c31813a5): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000002979d2a): kobject_uevent_env kobject: 'loop0' (0000000002979d2a): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000002979d2a): kobject_uevent_env kobject: 'loop0' (0000000002979d2a): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop1' (00000000601ee576): kobject_uevent_env kobject: 'loop1' (00000000601ee576): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000002979d2a): kobject_uevent_env kobject: 'loop0' (0000000002979d2a): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (000000005ed15dc5): kobject_uevent_env kobject: 'loop3' (000000005ed15dc5): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop1' (00000000601ee576): kobject_uevent_env kobject: 'loop1' (00000000601ee576): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (000000009b63a364): kobject_uevent_env kobject: 'loop4' (000000009b63a364): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (00000000c31813a5): kobject_uevent_env kobject: 'loop2' (00000000c31813a5): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000002979d2a): kobject_uevent_env kobject: 'loop0' (0000000002979d2a): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000002979d2a): kobject_uevent_env kobject: 'loop0' (0000000002979d2a): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (000000005ed15dc5): kobject_uevent_env kobject: 'loop3' (000000005ed15dc5): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000002979d2a): kobject_uevent_env kobject: 'loop0' (0000000002979d2a): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (000000005ed15dc5): kobject_uevent_env kobject: 'loop3' (000000005ed15dc5): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (0000000063ec54f5): kobject_uevent_env kobject: 'loop5' (0000000063ec54f5): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop1' (00000000601ee576): kobject_uevent_env kobject: 'loop1' (00000000601ee576): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop4' (000000009b63a364): kobject_uevent_env kobject: 'loop4' (000000009b63a364): fill_kobj_path: path = '/devices/virtual/block/loop4'