===================================== WARNING: bad unlock balance detected! 5.4.0-rc6-next-20191107 #0 Not tainted ------------------------------------- syz-executor721/8874 is trying to release lock (rcu_callback) at: [] __write_once_size include/linux/compiler.h:226 [inline] [] __rcu_reclaim kernel/rcu/rcu.h:221 [inline] [] rcu_do_batch kernel/rcu/tree.c:2183 [inline] [] rcu_core+0x563/0x1540 kernel/rcu/tree.c:2408 but there are no more locks to release! other info that might help us debug this: 1 lock held by syz-executor721/8874: #0: ffff8880a8cd20d8 (&type->s_umount_key#40/1){+.+.}, at: alloc_super+0x158/0x910 fs/super.c:229 stack backtrace: CPU: 1 PID: 8874 Comm: syz-executor721 Not tainted 5.4.0-rc6-next-20191107 #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+0x197/0x210 lib/dump_stack.c:118 print_unlock_imbalance_bug kernel/locking/lockdep.c:4008 [inline] print_unlock_imbalance_bug.cold+0x114/0x123 kernel/locking/lockdep.c:3984 __lock_release kernel/locking/lockdep.c:4244 [inline] lock_release+0x5f2/0x960 kernel/locking/lockdep.c:4505 rcu_lock_release include/linux/rcupdate.h:213 [inline] __rcu_reclaim kernel/rcu/rcu.h:223 [inline] rcu_do_batch kernel/rcu/tree.c:2183 [inline] rcu_core+0x583/0x1540 kernel/rcu/tree.c:2408 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2417 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:756 [inline] RIP: 0010:console_unlock+0xbb8/0xf00 kernel/printk/printk.c:2481 Code: f3 88 48 c1 e8 03 42 80 3c 30 00 0f 85 e4 02 00 00 48 83 3d 29 78 96 07 00 0f 84 91 01 00 00 e8 9e c0 16 00 48 8b 7d 98 57 9d <0f> 1f 44 00 00 e9 6d ff ff ff e8 89 c0 16 00 48 8b 7d 08 c7 05 7b RSP: 0018:ffff8880944878f0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8880a3d5e080 RBX: 0000000000000200 RCX: 1ffffffff13907aa RDX: 0000000000000000 RSI: ffffffff815ca842 RDI: 0000000000000293 RBP: ffff888094487978 R08: ffff8880a3d5e080 R09: fffffbfff11f417d R10: fffffbfff11f417c R11: 0000000000000001 R12: 0000000000000000 R13: ffffffff84437e40 R14: dffffc0000000000 R15: ffffffff895eabd0 vprintk_emit+0x2a0/0x700 kernel/printk/printk.c:1996 vprintk_default+0x28/0x30 kernel/printk/printk.c:2023 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:386 printk+0xba/0xed kernel/printk/printk.c:2056 __ntfs_error.cold+0x91/0xc7 fs/ntfs/debug.c:89 ntfs_fill_super+0x1aee/0x3160 fs/ntfs/super.c:2786 mount_bdev+0x304/0x3c0 fs/super.c:1415 ntfs_mount+0x35/0x40 fs/ntfs/super.c:3051 legacy_get_tree+0x108/0x220 fs/fs_context.c:647 vfs_get_tree+0x8e/0x300 fs/super.c:1545 do_new_mount fs/namespace.c:2822 [inline] do_mount+0x135a/0x1b50 fs/namespace.c:3142 ksys_mount+0xdb/0x150 fs/namespace.c:3351 __do_sys_mount fs/namespace.c:3365 [inline] __se_sys_mount fs/namespace.c:3362 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3362 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4416b9 Code: e8 6c aa 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 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffeff2db508 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004416b9 RDX: 0000000020000140 RSI: 0000000020000280 RDI: 00000000200004c0 RBP: 00000000000241c6 R08: 0000000000000000 R09: 0000000000402570 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004024e0 R13: 0000000000402570 R14: 0000000000000000 R15: 0000000000000000