------------[ cut here ]------------ refcount_t: decrement hit 0; leaking memory. WARNING: CPU: 2 PID: 9055 at lib/refcount.c:31 refcount_warn_saturate+0x1ed/0x210 lib/refcount.c:31 Modules linked in: CPU: 2 PID: 9055 Comm: syz-executor.2 Not tainted 6.9.0-rc4-syzkaller-00113-g2668e3ae2ef3 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:refcount_warn_saturate+0x1ed/0x210 lib/refcount.c:31 Code: 8b e8 97 6f d3 fc 90 0f 0b 90 90 e9 c3 fe ff ff e8 c8 9a 10 fd c6 05 c1 63 09 0b 01 90 48 c7 c7 c0 ba 6e 8b e8 74 6f d3 fc 90 <0f> 0b 90 90 e9 a0 fe ff ff 48 89 ef e8 e2 17 6d fd e9 44 fe ff ff RSP: 0018:ffffc90002bd6558 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90002ed1000 RDX: 0000000000040000 RSI: ffffffff81512bf6 RDI: 0000000000000001 RBP: ffff888059a77a9c R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000002 R12: ffff888059a77a9c R13: 0000000000000000 R14: 0000000007500478 R15: ffff8880158b7a78 FS: 0000000000000000(0000) GS:ffff88802c400000(0063) knlGS:00000000f5e6cb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000558801cfff78 CR3: 000000006cf08000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __refcount_dec include/linux/refcount.h:336 [inline] refcount_dec include/linux/refcount.h:351 [inline] dec_stack_record_count mm/page_owner.c:228 [inline] __reset_page_owner+0x2ea/0x370 mm/page_owner.c:266 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1141 [inline] free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2347 free_unref_folios+0x256/0xad0 mm/page_alloc.c:2536 shrink_folio_list+0x32e8/0x3f00 mm/vmscan.c:1428 evict_folios+0x6e6/0x1bb0 mm/vmscan.c:4537 try_to_shrink_lruvec+0x618/0x9b0 mm/vmscan.c:4733 lru_gen_shrink_lruvec mm/vmscan.c:4876 [inline] shrink_lruvec+0x2df/0x2a10 mm/vmscan.c:5653 shrink_node_memcgs mm/vmscan.c:5873 [inline] shrink_node.part.0+0x634/0x23e0 mm/vmscan.c:5908 shrink_node+0x73/0xb0 mm/vmscan.c:210 shrink_zones mm/vmscan.c:6152 [inline] do_try_to_free_pages+0x361/0x1a20 mm/vmscan.c:6214 try_to_free_mem_cgroup_pages+0x317/0x7f0 mm/vmscan.c:6529 try_charge_memcg+0x3d1/0x11a0 mm/memcontrol.c:2783 try_charge mm/memcontrol.c:2931 [inline] charge_memcg mm/memcontrol.c:7284 [inline] __mem_cgroup_charge+0xa6/0x140 mm/memcontrol.c:7299 mem_cgroup_charge include/linux/memcontrol.h:691 [inline] __filemap_add_folio+0x83d/0xf00 mm/filemap.c:864 filemap_add_folio+0xaf/0x1e0 mm/filemap.c:947 do_read_cache_folio+0x1dd/0x550 mm/filemap.c:3714 do_read_cache_page mm/filemap.c:3813 [inline] read_cache_page+0x5b/0x160 mm/filemap.c:3822 read_mapping_page include/linux/pagemap.h:888 [inline] dir_get_page fs/sysv/dir.c:64 [inline] sysv_find_entry+0x1e6/0x690 fs/sysv/dir.c:157 sysv_inode_by_name+0x71/0x3b0 fs/sysv/dir.c:374 sysv_lookup fs/sysv/namei.c:38 [inline] sysv_lookup+0x8c/0x100 fs/sysv/namei.c:31 lookup_open.isra.0+0x928/0x13c0 fs/namei.c:3475 open_last_lookups fs/namei.c:3566 [inline] path_openat+0x92f/0x2990 fs/namei.c:3796 do_filp_open+0x1dc/0x430 fs/namei.c:3826 do_sys_openat2+0x17a/0x1e0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_creat fs/open.c:1497 [inline] __se_sys_creat fs/open.c:1491 [inline] __ia32_sys_creat+0xcc/0x120 fs/open.c:1491 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x75/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf727a579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f5e6c5ac EFLAGS: 00000292 ORIG_RAX: 0000000000000008 RAX: ffffffffffffffda RBX: 0000000020000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi