------------[ cut here ]------------
refcount_t: saturated; leaking memory.
WARNING: lib/refcount.c:19 at refcount_warn_saturate+0x13a/0x1d0 lib/refcount.c:19, CPU#0: syz.9.2002/16931
Modules linked in:
CPU: 0 UID: 0 PID: 16931 Comm: syz.9.2002 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:refcount_warn_saturate+0x13a/0x1d0 lib/refcount.c:19
Code: 20 cf be 8b e8 67 9a f3 fc 90 0f 0b 90 90 eb b7 e8 8b 7b 31 fd c6 05 b5 a0 d7 0a 01 90 48 c7 c7 60 ce be 8b e8 47 9a f3 fc 90 <0f> 0b 90 90 eb 97 e8 6b 7b 31 fd c6 05 99 a0 d7 0a 01 90 48 c7 c7
RSP: 0018:ffffc9000ba87528 EFLAGS: 00010246
RAX: 430fd9f67c5abe00 RBX: 0000000000000000 RCX: ffff888032518000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc9000ba87648 R08: ffff8880b86247d3 R09: 1ffff110170c48fa
R10: dffffc0000000000 R11: ffffed10170c48fb R12: ffff8880573ea580
R13: 1ffff92001750eb8 R14: ffff8880573ea580 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125eba000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff507beb000 CR3: 000000007ae6c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __refcount_add_not_zero include/linux/refcount.h:187 [inline]
 refcount_add_not_zero include/linux/refcount.h:212 [inline]
 __vma_enter_locked+0x593/0x5d0 mm/mmap_lock.c:67
 __vma_start_write+0x23/0x140 mm/mmap_lock.c:99
 vma_start_write include/linux/mmap_lock.h:213 [inline]
 free_pgtables+0x72d/0x9d0 mm/memory.c:413
 exit_mmap+0x431/0xb40 mm/mmap.c:1288
 __mmput+0x118/0x430 kernel/fork.c:1173
 exit_mm+0x1da/0x2c0 kernel/exit.c:581
 do_exit+0x658/0x2310 kernel/exit.c:959
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1112
 get_signal+0x1285/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x87/0x4f0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2e9/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f22a1d8f749
Code: Unable to access opcode bytes at 0x7f22a1d8f71f.
RSP: 002b:00007f22a2be2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffffc RBX: 00007f22a1fe5fa0 RCX: 00007f22a1d8f749
RDX: 0000200000000040 RSI: 00000000c028aa05 RDI: 0000000000000006
RBP: 00007f22a1e13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f22a1fe6038 R14: 00007f22a1fe5fa0 R15: 00007ffd839de448
 </TASK>