------------[ cut here ]------------
page_counter underflow: -512 nr_pages=512
WARNING: mm/page_counter.c:61 at page_counter_cancel mm/page_counter.c:60 [inline], CPU#1: syz.2.2491/14873
WARNING: mm/page_counter.c:61 at page_counter_uncharge+0xd2/0x150 mm/page_counter.c:184, CPU#1: syz.2.2491/14873
Modules linked in:
CPU: 1 UID: 0 PID: 14873 Comm: syz.2.2491 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:page_counter_cancel mm/page_counter.c:60 [inline]
RIP: 0010:page_counter_uncharge+0xd8/0x150 mm/page_counter.c:184
Code: f7 e8 dc 8c f8 ff 4d 8b 36 4d 85 f6 74 6e e8 9f bf 8c ff e9 6c ff ff ff e8 95 bf 8c ff 48 8d 3d be 12 ff 0d 4c 89 fe 48 89 da <67> 48 0f b9 3a 4c 89 f7 be 08 00 00 00 e8 46 8f f8 ff 4c 89 f0 48
RSP: 0018:ffffc9001b0674f0 EFLAGS: 00010093
RAX: ffffffff82389e5b RBX: 0000000000000200 RCX: ffff8880872e8000
RDX: 0000000000000200 RSI: fffffffffffffe00 RDI: ffffffff9037b120
RBP: fffffffffffffe00 R08: ffff88807be44387 R09: 1ffff1100f7c8870
R10: dffffc0000000000 R11: ffffed100f7c8871 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff88807be44380 R15: fffffffffffffe00
FS:  0000000000000000(0000) GS:ffff888125345000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0df148e286 CR3: 0000000069098000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __hugetlb_cgroup_uncharge_folio+0x15e/0x510 mm/hugetlb_cgroup.c:354
 free_huge_folio+0xaef/0x11e0 mm/hugetlb.c:1774
 folios_put_refs+0x553/0x8d0 mm/swap.c:983
 folio_batch_release include/linux/pagevec.h:101 [inline]
 remove_inode_hugepages+0xf53/0x11a0 fs/hugetlbfs/inode.c:608
 hugetlbfs_evict_inode+0xaf/0x230 fs/hugetlbfs/inode.c:623
 evict+0x61e/0xb10 fs/inode.c:841
 __dentry_kill+0x1a2/0x5e0 fs/dcache.c:670
 finish_dput+0xc9/0x480 fs/dcache.c:879
 __fput+0x691/0xa60 fs/file_table.c:518
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x70f/0x23c0 kernel/exit.c:977
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1119
 __do_sys_exit_group kernel/exit.c:1130 [inline]
 __se_sys_exit_group kernel/exit.c:1128 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1128
 x64_sys_call+0x221a/0x2240 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efced99c819
Code: Unable to access opcode bytes at 0x7efced99c7ef.
RSP: 002b:00007ffca5e27778 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007efced99c819
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 000000000000000b
RBP: 0000000000001cde R08: 00007ffca5e27c17 R09: 000000000000000b
R10: 00007efcedc15fa0 R11: 0000000000000246 R12: 0000000000000003
R13: 00007efcedc1627c R14: 00007efcedc16278 R15: 00007efcedc16270
 </TASK>
----------------
Code disassembly (best guess):
   0:	f7 e8                	imul   %eax
   2:	dc 8c f8 ff 4d 8b 36 	fmull  0x368b4dff(%rax,%rdi,8)
   9:	4d 85 f6             	test   %r14,%r14
   c:	74 6e                	je     0x7c
   e:	e8 9f bf 8c ff       	call   0xff8cbfb2
  13:	e9 6c ff ff ff       	jmp    0xffffff84
  18:	e8 95 bf 8c ff       	call   0xff8cbfb2
  1d:	48 8d 3d be 12 ff 0d 	lea    0xdff12be(%rip),%rdi        # 0xdff12e2
  24:	4c 89 fe             	mov    %r15,%rsi
  27:	48 89 da             	mov    %rbx,%rdx
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	4c 89 f7             	mov    %r14,%rdi
  32:	be 08 00 00 00       	mov    $0x8,%esi
  37:	e8 46 8f f8 ff       	call   0xfff88f82
  3c:	4c 89 f0             	mov    %r14,%rax
  3f:	48                   	rex.W