===================================== WARNING: bad unlock balance detected! 5.6.0-rc7-syzkaller #0 Not tainted ------------------------------------- syz-executor.2/28483 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.2/28483: #0: ffff8880184620d8 (&type->s_umount_key#58/1){+.+.}, at: alloc_super+0x160/0x760 fs/super.c:229 stack backtrace: CPU: 1 PID: 28483 Comm: syz-executor.2 Not tainted 5.6.0-rc7-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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline] RIP: 0010:console_unlock+0xa25/0xec0 kernel/printk/printk.c:2481 Code: 20 00 74 0c 48 c7 c7 18 d4 0a 89 e8 25 d9 52 00 48 83 3d 15 be ac 07 00 0f 84 65 04 00 00 e8 12 80 16 00 48 8b 7c 24 10 57 9d <0f> 1f 44 00 00 f6 44 24 07 01 75 52 e8 fa 7f 16 00 eb 63 0f 1f 84 RSP: 0018:ffffc9001e087940 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: ffffffff815e160e RBX: 0000000000000200 RCX: 0000000000040000 RDX: ffffc9000d74e000 RSI: 000000000000c184 RDI: 0000000000000282 RBP: ffffc9001e0879f8 R08: ffffffff817a2210 R09: fffffbfff121aff9 R10: fffffbfff121aff9 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff892be758 vprintk_emit+0x1f8/0x3b0 kernel/printk/printk.c:1996 printk+0x62/0x83 kernel/printk/printk.c:2056 __ntfs_warning+0x185/0x190 fs/ntfs/debug.c:46 is_boot_sector_ntfs+0xf7/0x880 fs/ntfs/super.c:586 read_ntfs_boot_sector fs/ntfs/super.c:671 [inline] ntfs_fill_super+0x5de/0x89f0 fs/ntfs/super.c:2784 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:00007f86a3860a68 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f86a38616d4 RCX: 000000000045f29a RDX: 00007f86a3860ae0 RSI: 00000000200004c0 RDI: 00007f86a3860b00 RBP: 000000000076bfa0 R08: 00007f86a3860b40 R09: 00007f86a3860ae0 R10: 0000000000000041 R11: 0000000000000206 R12: 00000000ffffffff R13: 0000000000000be7 R14: 00000000004ce08e R15: 000000000076bfac