loop2: detected capacity change from 0 to 512
EXT4-fs (loop2): feature flags set on rev 0 fs, running e2fsck is recommended
==================================================================
BUG: KASAN: use-after-free in check_igot_inode fs/ext4/inode.c:-1 [inline]
BUG: KASAN: use-after-free in __ext4_iget+0x2c0/0x3f40 fs/ext4/inode.c:4843
Read of size 8 at addr ffff88805d7eff30 by task syz.2.418/6882

CPU: 0 PID: 6882 Comm: syz.2.418 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xa8/0x210 mm/kasan/report.c:468
 kasan_report+0x117/0x150 mm/kasan/report.c:581
 check_igot_inode fs/ext4/inode.c:-1 [inline]
 __ext4_iget+0x2c0/0x3f40 fs/ext4/inode.c:4843
 __ext4_fill_super fs/ext4/super.c:5513 [inline]
 ext4_fill_super+0x5020/0x6790 fs/ext4/super.c:5740
 get_tree_bdev+0x3f3/0x520 fs/super.c:1591
 vfs_get_tree+0x8c/0x280 fs/super.c:1764
 do_new_mount+0x24b/0xa40 fs/namespace.c:3386
 do_mount fs/namespace.c:3726 [inline]
 __do_sys_mount fs/namespace.c:3935 [inline]
 __se_sys_mount+0x2e7/0x3d0 fs/namespace.c:3912
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1bd799da8a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1bd8877e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f1bd8877ee0 RCX: 00007f1bd799da8a
RDX: 0000200000000040 RSI: 0000200000000000 RDI: 00007f1bd8877ea0
RBP: 0000200000000040 R08: 00007f1bd8877ee0 R09: 000000000001c917
R10: 000000000001c917 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f1bd8877ea0 R14: 00000000000004ef R15: 0000200000000140
 </TASK>

The buggy address belongs to the physical page:
page:ffffea000175fbc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x2 pfn:0x5d7ef
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000002 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x8(__GFP_MOVABLE), pid 1, tgid 1 (swapper/0), ts 29288581178, free_ts 31587634253
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581
 split_map_pages+0x284/0x4e0 mm/compaction.c:97
 isolate_freepages_range+0x3e8/0x440 mm/compaction.c:775
 alloc_contig_range+0x5d8/0x8a0 mm/page_alloc.c:6295
 __alloc_contig_pages mm/page_alloc.c:6318 [inline]
 alloc_contig_pages+0x478/0x580 mm/page_alloc.c:6398
 debug_vm_pgtable_alloc_huge_page+0xbf/0x110 mm/debug_vm_pgtable.c:1087
 init_args+0x724/0x9b0 mm/debug_vm_pgtable.c:1269
 debug_vm_pgtable+0xe9/0x440 mm/debug_vm_pgtable.c:1307
 do_one_initcall+0x242/0x790 init/main.c:1250
 do_initcall_level+0x137/0x1f0 init/main.c:1312
 do_initcalls+0x69/0xd0 init/main.c:1328
 kernel_init_freeable+0x3ed/0x580 init/main.c:1565
 kernel_init+0x1d/0x1c0 init/main.c:1455
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1181 [inline]
 free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
 free_contig_range+0xa1/0x150 mm/page_alloc.c:6420
 destroy_args+0x80/0x850 mm/debug_vm_pgtable.c:1015
 debug_vm_pgtable+0x411/0x440 mm/debug_vm_pgtable.c:1400
 do_one_initcall+0x242/0x790 init/main.c:1250
 do_initcall_level+0x137/0x1f0 init/main.c:1312
 do_initcalls+0x69/0xd0 init/main.c:1328
 kernel_init_freeable+0x3ed/0x580 init/main.c:1565
 kernel_init+0x1d/0x1c0 init/main.c:1455
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293

Memory state around the buggy address:
 ffff88805d7efe00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88805d7efe80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88805d7eff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                     ^
 ffff88805d7eff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88805d7f0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================