R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a971e
R13: 0000000000000000 R14: 00007ffe3285c858 R15: 00007ffe3285c9c8
DEBUG_LOCKS_WARN_ON(depth <= 0)
------------[ cut here ]------------
WARNING: CPU: 3 PID: 2989 at kernel/locking/lockdep.c:3766 __lock_release kernel/locking/lockdep.c:3766 [inline]
WARNING: CPU: 3 PID: 2989 at kernel/locking/lockdep.c:3766 lock_release+0x5ec/0xd70 kernel/locking/lockdep.c:4023
Kernel panic - not syncing: panic_on_warn set ...

CPU: 3 PID: 2989 Comm: syz-executor0 Not tainted 4.14.0-rc8-next-20171109+ #11
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
hub 1-0:1.0: activate --> -22
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1c4/0x1e0 kernel/panic.c:546
 report_bug+0x211/0x2d0 lib/bug.c:184
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:176
 do_trap_no_signal arch/x86/kernel/traps.c:210 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:259
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:309
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:926
RIP: 0010:__lock_release kernel/locking/lockdep.c:3766 [inline]
RIP: 0010:lock_release+0x5ec/0xd70 kernel/locking/lockdep.c:4023
RSP: 0018:ffff88002cae74c0 EFLAGS: 00010086
RAX: 000000000000001f RBX: 1ffff1000595ce9d RCX: 0000000000000000
RDX: 000000000000001f RSI: 1ffff1000595ce58 RDI: ffffed000595ce8c
RBP: ffff88002cae7670 R08: 0000000000000001 R09: 0000000000000000
R10: ffff88002ad14080 R11: fffffbfff0e81a5b R12: ffff88002cae7548
R13: ffff88002cae7648 R14: ffff880078668358 R15: ffffffff8744dce0
 up_write+0x6b/0x120 kernel/locking/rwsem.c:131
hub 1-0:1.0: activate --> -22
 destroy_unused_super.part.7+0x18/0xd0 fs/super.c:163
 destroy_unused_super fs/super.c:505 [inline]
 alloc_super fs/super.c:258 [inline]
 sget_userns+0x905/0xe20 fs/super.c:503
 mount_ns+0x6d/0x190 fs/super.c:1026
 mqueue_mount+0xbe/0xe0 ipc/mqueue.c:340
 mount_fs+0x66/0x2d0 fs/super.c:1219
 vfs_kern_mount.part.26+0xc6/0x4a0 fs/namespace.c:1037
 vfs_kern_mount fs/namespace.c:3291 [inline]
 kern_mount_data+0x50/0xb0 fs/namespace.c:3291
 mq_init_ns+0x167/0x220 ipc/mqueue.c:1593
 create_ipc_ns ipc/namespace.c:68 [inline]
 copy_ipcs+0x3a4/0x520 ipc/namespace.c:96
 create_new_namespaces+0x278/0x880 kernel/nsproxy.c:87
 unshare_nsproxy_namespaces+0xae/0x1e0 kernel/nsproxy.c:206
 SYSC_unshare kernel/fork.c:2412 [inline]
 SyS_unshare+0x653/0xfa0 kernel/fork.c:2362
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x447c99
RSP: 002b:00007ffe3285ca68 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00000000016a490c RCX: 0000000000447c99
hub 1-0:1.0: activate --> -22
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000002c000200
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a971e
R13: 0000000000000000 R14: 00007ffe3285c858 R15: 00007ffe3285c9c8
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..