------------[ cut here ]------------ refcount_t: decrement hit 0; leaking memory. WARNING: CPU: 1 PID: 5305 at lib/refcount.c:31 refcount_warn_saturate+0x1ed/0x210 lib/refcount.c:31 Modules linked in: CPU: 1 PID: 5305 Comm: syz-executor310 Not tainted 6.9.0-rc4-syzkaller-00034-g4b6b51322118 #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 37 6f d3 fc 90 0f 0b 90 90 e9 c3 fe ff ff e8 68 9a 10 fd c6 05 e1 61 09 0b 01 90 48 c7 c7 80 ba 6e 8b e8 14 6f d3 fc 90 <0f> 0b 90 90 e9 a0 fe ff ff 48 89 ef e8 82 17 6d fd e9 44 fe ff ff RSP: 0018:ffffc90003d2f2c0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81512be9 RDX: ffff88801fadc880 RSI: ffffffff81512bf6 RDI: 0000000000000001 RBP: ffff88801ff4909c R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000003 R12: ffff88801ff4909c R13: 0000000000000000 R14: 000000000210021a R15: ffff888040985ba8 FS: 0000000000000000(0000) GS:ffff88802c300000(0063) knlGS:00000000f7e34b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000002000018c CR3: 000000000020c000 CR4: 0000000000350ef0 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 folios_put_refs+0x49c/0x750 mm/swap.c:1034 folio_batch_release include/linux/pagevec.h:101 [inline] truncate_inode_pages_range+0x334/0xe90 mm/truncate.c:362 truncate_inode_pages mm/truncate.c:439 [inline] truncate_pagecache+0x65/0x90 mm/truncate.c:732 ext4_setattr+0x16b6/0x2700 fs/ext4/inode.c:5448 notify_change+0x742/0x11c0 fs/attr.c:497 do_truncate+0x15c/0x220 fs/open.c:65 handle_truncate fs/namei.c:3300 [inline] do_open fs/namei.c:3646 [inline] path_openat+0x24b9/0x2990 fs/namei.c:3799 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_compat_sys_openat fs/open.c:1481 [inline] __se_compat_sys_openat fs/open.c:1479 [inline] __ia32_compat_sys_openat+0x16e/0x210 fs/open.c:1479 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: 0023:0xf7e39579 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:00000000f7e346dc EFLAGS: 00000296 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 0000000020000180 RDX: 000000000000275a RSI: 0000000000000000 RDI: 00000000f7efe3ac RBP: 0000000000000081 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 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