syzbot

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refcount_t: addition on 0; use-after-free.
WARNING: CPU: 0 PID: 6540 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0 lib/refcount.c:25
Modules linked in:
CPU: 0 PID: 6540 Comm: syz-executor161 Not tainted 5.15.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:refcount_warn_saturate+0x169/0x1e0 lib/refcount.c:25
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
RSP: 0018:ffffc9000c7a7f10 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888073be0300 RSI: ffffffff815dcf58 RDI: fffff520018f4fd4
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff815d6cce R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000555556a3f300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1bacc3b6c0 CR3: 00000000214ae000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __refcount_add include/linux/refcount.h:199 [inline]
 __refcount_inc include/linux/refcount.h:250 [inline]
 refcount_inc include/linux/refcount.h:267 [inline]
 __do_sys_memfd_secret mm/secretmem.c:221 [inline]
 __se_sys_memfd_secret mm/secretmem.c:194 [inline]
 __x64_sys_memfd_secret+0x182/0x1e0 mm/secretmem.c:194
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fc28a0a4f79
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
RSP: 002b:00007ffd689c4668 EFLAGS: 00000246 ORIG_RAX: 00000000000001bf
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc28a0a4f79
RDX: 00007fc28a067e83 RSI: 0000000000000012 RDI: 0000000000000000
RBP: 00007fc28a068f60 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fc28a068ff0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000