------------[ cut here ]------------
WARNING: CPU: 1 PID: 8856 at fs/namespace.c:1186 mntput_no_expire+0xaca/0xcb0 fs/namespace.c:1186
Modules linked in:
CPU: 1 PID: 8856 Comm: syz-executor.4 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 c9 78 89 be c2 02 00 00 48 c7 c7 20 c9 78 89 c6 05 b5 83 65 0b 01 e8 5e f6 f6 06 e9 3f fd ff ff e8 96 b8 a8 ff <0f> 0b e9 fc fc ff ff e8 8a b8 a8 ff e8 e5 f0 94 ff 31 ff 89 c5 89
RSP: 0018:ffffc9000192fc78 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff92000325f95 RCX: 0000000000000000
RDX: ffff888011a954c0 RSI: ffffffff81cb36fa RDI: 0000000000000003
RBP: ffff888034c44c00 R08: 0000000000000000 R09: ffffffff8f2978af
R10: ffffffff81cb33f4 R11: 0000000000000000 R12: 0000000000000008
R13: ffffc9000192fcc8 R14: dffffc0000000000 R15: 00000000ffffffff
FS:  0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000545f98 CR3: 0000000013813000 CR4: 00000000001506e0
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
 __do_sys_exit_group kernel/exit.c:933 [inline]
 __se_sys_exit_group kernel/exit.c:931 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x466459
Code: Unable to access opcode bytes at RIP 0x46642f.
RSP: 002b:0000000000a9eb58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000064 RCX: 0000000000466459
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 00000000004bec36 R08: 000000000000000b R09: 000000000296e3bc
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000a9fe00 R14: 000000000296e3bc R15: 0000000000a9fe40