BUG: unable to handle kernel paging request at 0000000048201a2b
IP: lock_release+0x195/0xda0 kernel/locking/lockdep.c:4021
PGD 5e28067 P4D 5e28067 PUD 5e2a067 PMD 0 
Oops: 0002 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 5464 Comm: syz-executor1 Not tainted 4.15.0-rc1-mm1+ #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: 000000001b7a81c0 task.stack: 00000000b64ae5a2
RIP: 0010:lock_release+0x195/0xda0 kernel/locking/lockdep.c:4021
RSP: 0018:ffff8801c14ef0f0 EFLAGS: 00010046
RAX: 0000000000000007 RBX: 1ffff1003829de23 RCX: ffffffff81b78fa1
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801c13f6c84
RBP: ffff8801c14ef260 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff8748cda0 R12: ffff8801c13f6400
R13: ffff8801c14ef238 R14: ffffffff85f44cc0 R15: ffff8801c13f6400
FS:  00007faf17497700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffff8 CR3: 0000000005e25000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000020001000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 rcu_lock_release include/linux/rcupdate.h:249 [inline]
 rcu_read_unlock include/linux/rcupdate.h:686 [inline]
 mntput_no_expire+0x159/0xa90 fs/namespace.c:1199
 mntput+0x61/0x90 fs/namespace.c:1247
 __fput+0x537/0x7f0 fs/file_table.c:229
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9bb/0x1ae0 kernel/exit.c:869
 do_group_exit+0x149/0x400 kernel/exit.c:972
 get_signal+0x73f/0x16c0 kernel/signal.c:2335
 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
 entry_SYSCALL_64_fastpath+0x94/0x96
RIP: 0033:0x4529d9
RSP: 002b:00007faf17496c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: fffffffffffffffc RBX: 0000000000758020 RCX: 00000000004529d9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 000000000000001b
RBP: 000000000000021e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f0370
R13: 00000000ffffffff R14: 00007faf174976d4 R15: 0000000000000000
Code: 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 c4 08 00 00 41 c7 87 84 08 00 00 01 00 00 00 <cc> 3f 05 00 00 65 8b 05 cf d5 aa 7e 89 c0 48 0f a3 05 d5 6e 08 
RIP: lock_release+0x195/0xda0 kernel/locking/lockdep.c:4021 RSP: ffff8801c14ef0f0
CR2: fffffffffffffff8
---[ end trace 0c3ce5e45fd94a41 ]---