------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 1 PID: 26185 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0 lib/refcount.c:25
Modules linked in:
CPU: 1 PID: 26185 Comm: syz-executor.2 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 17 5e 9c fd 84 db 0f 85 36 ff ff ff e8 ca 57 9c fd 48 c7 c7 40 ee e3 89 c6 05 52 67 7f 09 01 e8 52 1c 19 05 <0f> 0b e9 17 ff ff ff e8 ab 57 9c fd 0f b6 1d 37 67 7f 09 31 ff 89
RSP: 0018:ffffc90019057f10 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888024e05580 RSI: ffffffff815e9d98 RDI: fffff5200320afd4
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff815e3b3e R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f3486f94700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3486f73718 CR3: 0000000040b86000 CR4: 0000000000350ee0
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: 0033:0x7f3489a1ea39
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3486f94188 EFLAGS: 00000246 ORIG_RAX: 00000000000001bf
RAX: ffffffffffffffda RBX: 00007f3489b21f60 RCX: 00007f3489a1ea39
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000080000
RBP: 00007f3489a78e8f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd9f59b1af R14: 00007f3486f94300 R15: 0000000000022000