INFO: trying to register non-static key. the code is fine but needs lockdep annotation. turning off the locking correctness validator. CPU: 1 PID: 7202 Comm: syz-executor152 Not tainted 5.6.0-next-20200411-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+0x188/0x20d lib/dump_stack.c:118 assign_lock_key kernel/locking/lockdep.c:913 [inline] register_lock_class+0x1664/0x1760 kernel/locking/lockdep.c:1225 __lock_acquire+0x104/0x4c50 kernel/locking/lockdep.c:4234 lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4934 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x8c/0xbf kernel/locking/spinlock.c:159 prepare_to_wait_event+0x5b/0x650 kernel/sched/wait.c:280 uhid_char_read+0x321/0x6c0 drivers/hid/uhid.c:669 do_loop_readv_writev fs/read_write.c:715 [inline] do_loop_readv_writev fs/read_write.c:702 [inline] do_iter_read+0x483/0x650 fs/read_write.c:936 vfs_readv+0xf0/0x160 fs/read_write.c:1054 do_readv+0x27f/0x300 fs/read_write.c:1091 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x4458d9 Code: e8 bc b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 2b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd20c24bda8 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 00000000006dac28 RCX: 00000000004458d9 RDX: 0000000000000002 RSI: 0000000020001680 RDI: 0000000000000003 RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac2c R13: 0000000020000b40 R14: 00000000004adda8 R15: 20c49ba5e353f7cf list_del corruption. prev->next should be ffffc90001817bc0, but was 0000000000000000 ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:51! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 7202 Comm: syz-executor152 Not tainted 5.6.0-next-20200411-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_del_entry_valid.cold+0xf/0x55 lib/list_debug.c:51 Code: e8 34 5c c2 fd 0f 0b 48 89 f1 48 c7 c7 00 a9 72 88 4c 89 e6 e8 20 5c c2 fd 0f 0b 48 89 ee 48 c7 c7 a0 aa 72 88 e8 0f 5c c2 fd <0f> 0b 4c 89 ea 48 89 ee 48 c7 c7 e0 a9 72 88 e8 fb 5b c2 fd 0f 0b RSP: 0018:ffffc90001817a60 EFLAGS: 00010082 RAX: 0000000000000054 RBX: ffffc90001817ba8 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff815ce321 RDI: fffff52000302f3e RBP: ffffc90001817bc0 R08: 0000000000000054 R09: ffffed1015ce45f1 R10: ffff8880ae722f83 R11: ffffed1015ce45f0 R12: ffff888094741210 R13: ffff888094741210 R14: 0000000000000286 R15: ffffc90001817bc0 FS: 00007fd20c24c700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555c78686c20 CR3: 00000000a30be000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:132 [inline] list_del_init include/linux/list.h:204 [inline] prepare_to_wait_event+0x19c/0x650 kernel/sched/wait.c:294 uhid_char_read+0x321/0x6c0 drivers/hid/uhid.c:669 do_loop_readv_writev fs/read_write.c:715 [inline] do_loop_readv_writev fs/read_write.c:702 [inline] do_iter_read+0x483/0x650 fs/read_write.c:936 vfs_readv+0xf0/0x160 fs/read_write.c:1054 do_readv+0x27f/0x300 fs/read_write.c:1091 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x4458d9 Code: e8 bc b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 2b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd20c24bda8 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 00000000006dac28 RCX: 00000000004458d9 RDX: 0000000000000002 RSI: 0000000020001680 RDI: 0000000000000003 RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac2c R13: 0000000020000b40 R14: 00000000004adda8 R15: 20c49ba5e353f7cf Modules linked in: ---[ end trace e7d42539b3cc4294 ]--- RIP: 0010:__list_del_entry_valid.cold+0xf/0x55 lib/list_debug.c:51 Code: e8 34 5c c2 fd 0f 0b 48 89 f1 48 c7 c7 00 a9 72 88 4c 89 e6 e8 20 5c c2 fd 0f 0b 48 89 ee 48 c7 c7 a0 aa 72 88 e8 0f 5c c2 fd <0f> 0b 4c 89 ea 48 89 ee 48 c7 c7 e0 a9 72 88 e8 fb 5b c2 fd 0f 0b RSP: 0018:ffffc90001817a60 EFLAGS: 00010082 RAX: 0000000000000054 RBX: ffffc90001817ba8 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff815ce321 RDI: fffff52000302f3e RBP: ffffc90001817bc0 R08: 0000000000000054 R09: ffffed1015ce45f1 R10: ffff8880ae722f83 R11: ffffed1015ce45f0 R12: ffff888094741210 R13: ffff888094741210 R14: 0000000000000286 R15: ffffc90001817bc0 FS: 00007fd20c24c700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555c78686c20 CR3: 00000000a30be000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400