TITLE: WARNING: refcount bug in sys_memfd_secret
ALT: WARNING: refcount bug in __x64_sys_memfd_secret
TYPE: REFCOUNT_WARNING

[   90.146573][ T6540] ------------[ cut here ]------------
[   90.172091][ T6540] refcount_t: addition on 0; use-after-free.
[   90.178798][ T6540] WARNING: CPU: 0 PID: 6540 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0
[   90.188343][ T6540] Modules linked in:
[   90.192280][ T6540] CPU: 0 PID: 6540 Comm: syz-executor161 Not tainted 5.15.0-rc6-syzkaller #0
[   90.201168][ T6540] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   90.211469][ T6540] RIP: 0010:refcount_warn_saturate+0x169/0x1e0
[   90.217710][ T6540] Code: 09 31 ff 89 de e8 87 b4 9b fd 84 db 0f 85 36 ff ff ff e8 ca ac 9b fd 48 c7 c7 c0 65 e3 89 c6 05 ff 56 7f 09 01 e8 0d 45 19 05 <0f> 0b e9 17 ff ff ff e8 ab ac 9b fd 0f b6 1d e4 56 7f 09 31 ff 89
[   90.237430][ T6540] RSP: 0018:ffffc9000c7a7f10 EFLAGS: 00010286
[   90.243496][ T6540] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   90.251513][ T6540] RDX: ffff888073be0300 RSI: ffffffff815dcf58 RDI: fffff520018f4fd4
[   90.259570][ T6540] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
[   90.267606][ T6540] R10: ffffffff815d6cce R11: 0000000000000000 R12: 0000000000000000
[   90.275595][ T6540] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[   90.283632][ T6540] FS:  0000555556a3f300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
[   90.292659][ T6540] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   90.299342][ T6540] CR2: 00007f1bacc3b6c0 CR3: 00000000214ae000 CR4: 00000000003506f0
[   90.307462][ T6540] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   90.315443][ T6540] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   90.323509][ T6540] Call Trace:
[   90.326862][ T6540]  __x64_sys_memfd_secret+0x182/0x1e0
[   90.332246][ T6540]  do_syscall_64+0x35/0xb0
[   90.336736][ T6540]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[   90.342641][ T6540] RIP: 0033:0x7fc28a0a4f79
[   90.347123][ T6540] Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
[   90.366874][ T6540] RSP: 002b:00007ffd689c4668 EFLAGS: 00000246 ORIG_RAX: 00000000000001bf
[   90.375307][ T6540] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc28a0a4f79
[   90.383323][ T6540] RDX: 00007fc28a067e83 RSI: 0000000000000012 RDI: 0000000000000000
[   90.391384][ T6540] RBP: 00007fc28a068f60 R08: 0000000000000000 R09: 0000000000000000
[   90.399422][ T6540] R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fc28a068ff0
[   90.407488][ T6540] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
