------------[ cut here ]------------
WARNING: CPU: 0 PID: 9917 at fs/namespace.c:1186 mntput_no_expire+0xaca/0xcb0 fs/namespace.c:1186
Modules linked in:
CPU: 0 PID: 9917 Comm: syz-executor.3 Not tainted 5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:mntput_no_expire+0xaca/0xcb0 fs/namespace.c:1186
Code: ff 48 c7 c2 60 cb 78 89 be c2 02 00 00 48 c7 c7 20 cb 78 89 c6 05 35 6f e5 0b 01 e8 1d f2 f6 06 e9 3f fd ff ff e8 d6 a5 a8 ff <0f> 0b e9 fc fc ff ff e8 ca a5 a8 ff e8 65 dc 94 ff 31 ff 89 c5 89
RSP: 0018:ffffc90016a9fa38 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff92002d53f4d RCX: 0000000000000000
RDX: ffff8880681f0000 RSI: ffffffff81cb4b3a RDI: 0000000000000003
RBP: ffff8880291f1b00 R08: 0000000000000000 R09: ffffffff8fa988af
R10: ffffffff81cb4834 R11: 0000000000000000 R12: 0000000000000008
R13: ffffc90016a9fa88 R14: dffffc0000000000 R15: 00000000ffffffff
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3382a000 CR3: 000000002554e000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 mntput fs/namespace.c:1232 [inline]
 cleanup_mnt+0x523/0x530 fs/namespace.c:1132
 task_work_run+0xdd/0x1a0 kernel/task_work.c:140
 exit_task_work include/linux/task_work.h:30 [inline]
 do_exit+0xbfc/0x2a60 kernel/exit.c:825
 do_group_exit+0x125/0x310 kernel/exit.c:922
 get_signal+0x47f/0x2150 kernel/signal.c:2781
 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789
 handle_signal_work kernel/entry/common.c:147 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x466459
Code: Unable to access opcode bytes at RIP 0x46642f.
RSP: 002b:00007f4b7be40218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000056c010 RCX: 0000000000466459
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056c010
RBP: 000000000056c008 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c014
R13: 0000000000a9fb1f R14: 00007f4b7be40300 R15: 0000000000022000