===================================== WARNING: bad unlock balance detected! 5.6.0-syzkaller #0 Not tainted ------------------------------------- syz-executor.0/8792 is trying to release lock (rcu_callback) at: [] rcu_lock_release+0x0/0x20 include/linux/rcupdate.h:209 but there are no more locks to release! other info that might help us debug this: 1 lock held by syz-executor.0/8792: #0: ffff8882096b40d8 (&type->s_umount_key#81/1){+.+.}, at: alloc_super+0x160/0x760 fs/super.c:229 stack backtrace: CPU: 0 PID: 8792 Comm: syz-executor.0 Not tainted 5.6.0-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+0x1e9/0x30e lib/dump_stack.c:118 print_unlock_imbalance_bug+0x20b/0x240 kernel/locking/lockdep.c:4007 __lock_release kernel/locking/lockdep.c:4241 [inline] lock_release+0x37c/0x720 kernel/locking/lockdep.c:4502 rcu_do_batch kernel/rcu/tree.c:2188 [inline] rcu_core+0x7f0/0x1080 kernel/rcu/tree.c:2410 __do_softirq+0x268/0x7c5 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x223/0x230 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:546 [inline] smp_apic_timer_interrupt+0x113/0x280 arch/x86/kernel/apic/apic.c:1146 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:strcmp+0x1/0xa0 lib/string.c:359 Code: 1d 00 00 4c 89 e0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 89 f9 80 e1 07 38 c1 7c e3 e8 7a ec bb f9 eb dc 0f 0b 66 0f 1f 44 00 00 55 <41> 57 41 56 53 49 89 f6 48 89 fb 49 bf 00 00 00 00 00 fc ff df 66 RSP: 0018:ffffc90001ae7af8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: ffff888000ab0540 RBX: 00000000ffffffff RCX: 0000000000000002 RDX: ffffc90001eb9000 RSI: ffffffff88d04508 RDI: ffff888042c5006d RBP: ffff888042c50070 R08: ffffffff826eee8f R09: ffffffff839500a6 R10: ffff888000ab0540 R11: 0000000000000002 R12: 1ffff9200035cf6c R13: dffffc0000000000 R14: ffffc90001ae7b60 R15: ffff888042c5006d parse_options+0x1b6/0x1dd0 fs/ntfs/super.c:180 ntfs_fill_super+0x1e2/0x89f0 fs/ntfs/super.c:2748 mount_bdev+0x232/0x340 fs/super.c:1417 legacy_get_tree+0xea/0x180 fs/fs_context.c:622 vfs_get_tree+0x88/0x270 fs/super.c:1547 do_new_mount fs/namespace.c:2822 [inline] do_mount+0x17d5/0x2440 fs/namespace.c:3107 __do_sys_mount fs/namespace.c:3316 [inline] __se_sys_mount+0xd3/0x100 fs/namespace.c:3293 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:294 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:00007f2d120f2a68 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f2d120f36d4 RCX: 000000000045f29a RDX: 00007f2d120f2ae0 RSI: 0000000020000080 RDI: 00007f2d120f2b00 RBP: 000000000076bf00 R08: 00007f2d120f2b40 R09: 00007f2d120f2ae0 R10: 0000000000000000 R11: 0000000000000206 R12: 00000000ffffffff R13: 0000000000000be7 R14: 00000000004ce08e R15: 000000000076bf0c