===================================== WARNING: bad unlock balance detected! 5.6.0-rc3-next-20200228-syzkaller #0 Not tainted ------------------------------------- syz-executor.0/12571 is trying to release lock (rcu_callback) at: [] __write_once_size include/linux/compiler.h:250 [inline] [] rcu_do_batch kernel/rcu/tree.c:2217 [inline] [] rcu_core+0x592/0x1370 kernel/rcu/tree.c:2445 but there are no more locks to release! other info that might help us debug this: 1 lock held by syz-executor.0/12571: #0: ffff8880522940d8 (&type->s_umount_key#50/1){+.+.}, at: alloc_super+0x152/0x910 fs/super.c:229 stack backtrace: CPU: 0 PID: 12571 Comm: syz-executor.0 Not tainted 5.6.0-rc3-next-20200228-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 __lock_release kernel/locking/lockdep.c:4477 [inline] lock_release+0x586/0x7c0 kernel/locking/lockdep.c:4738 rcu_lock_release include/linux/rcupdate.h:213 [inline] rcu_do_batch kernel/rcu/tree.c:2220 [inline] rcu_core+0x5b2/0x1370 kernel/rcu/tree.c:2445 __do_softirq+0x26c/0x99d kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x192/0x1d0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:546 [inline] smp_apic_timer_interrupt+0x19e/0x600 arch/x86/kernel/apic/apic.c:1146 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:console_unlock+0xba8/0xf00 kernel/printk/printk.c:2482 Code: 89 48 c1 e8 03 42 80 3c 38 00 0f 85 36 03 00 00 48 83 3d 52 d6 37 08 00 0f 84 8e 01 00 00 e8 8f a3 16 00 48 8b 7c 24 28 57 9d <0f> 1f 44 00 00 eb 88 e8 7c a3 16 00 c7 05 72 1c 04 0b 00 00 00 00 RSP: 0018:ffffc900077879c0 EFLAGS: 00000216 ORIG_RAX: ffffffffffffff13 RAX: 0000000000040000 RBX: 0000000000000200 RCX: ffffc90001ea9000 RDX: 000000000001c84f RSI: ffffffff815bf1f1 RDI: 0000000000000216 RBP: 0000000000000000 R08: ffff888054c545c0 R09: fffffbfff1334569 R10: fffffbfff1334568 R11: 0000000000000001 R12: ffffffff84a5da50 R13: ffffffff8a15c930 R14: 0000000000000066 R15: dffffc0000000000 vprintk_emit+0x2a7/0x710 kernel/printk/printk.c:1994 vprintk_func+0x79/0x17e kernel/printk/printk_safe.c:386 printk+0xba/0xed kernel/printk/printk.c:2054 __ntfs_error.cold+0x91/0xc7 fs/ntfs/debug.c:89 read_ntfs_boot_sector fs/ntfs/super.c:675 [inline] ntfs_fill_super+0x19e2/0x3080 fs/ntfs/super.c:2784 mount_bdev+0x305/0x3c0 fs/super.c:1417 legacy_get_tree+0x105/0x220 fs/fs_context.c:622 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2822 [inline] do_mount+0x1306/0x1a60 fs/namespace.c:3107 __do_sys_mount fs/namespace.c:3316 [inline] __se_sys_mount fs/namespace.c:3293 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3293 do_syscall_64+0xf6/0x790 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45f29a Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 4d 8c fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 2a 8c fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007f269391ca68 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f269391d6d4 RCX: 000000000045f29a RDX: 00007f269391cae0 RSI: 0000000020001040 RDI: 00007f269391cb00 RBP: 000000000076bf00 R08: 00007f269391cb40 R09: 00007f269391cae0 R10: 0000000000000000 R11: 0000000000000206 R12: 00000000ffffffff R13: 0000000000000be7 R14: 0000000000000004 R15: 000000000076bf0c