loop1: detected capacity change from 0 to 512 ================================================================== BUG: KASAN: slab-out-of-bounds in check_igot_inode fs/ext4/inode.c:-1 [inline] BUG: KASAN: slab-out-of-bounds in __ext4_iget+0x2bb/0x3e50 fs/ext4/inode.c:4715 Read of size 8 at addr ffff888111ea7ef8 by task syz.1.6078/13081 CPU: 1 PID: 13081 Comm: syz.1.6078 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0xf1/0x140 mm/kasan/report.c:444 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 check_igot_inode fs/ext4/inode.c:-1 [inline] __ext4_iget+0x2bb/0x3e50 fs/ext4/inode.c:4715 ext4_quota_enable fs/ext4/super.c:6433 [inline] ext4_enable_quotas+0x33c/0x6d0 fs/ext4/super.c:6469 ext4_fill_super+0x82fa/0x8bd0 fs/ext4/super.c:4976 mount_bdev+0x2ae/0x3e0 fs/super.c:1400 ext4_mount+0x34/0x40 fs/ext4/super.c:6648 legacy_get_tree+0xed/0x190 fs/fs_context.c:611 vfs_get_tree+0x89/0x260 fs/super.c:1530 do_new_mount+0x25a/0xa20 fs/namespace.c:3034 path_mount+0x659/0xff0 fs/namespace.c:3364 do_mount fs/namespace.c:3377 [inline] __do_sys_mount fs/namespace.c:3585 [inline] __se_sys_mount+0x320/0x390 fs/namespace.c:3562 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3562 x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fa1e4bc4a8a 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:00007fa1e361de58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fa1e361dee0 RCX: 00007fa1e4bc4a8a RDX: 00002000000004c0 RSI: 0000200000000500 RDI: 00007fa1e361dea0 RBP: 00002000000004c0 R08: 00007fa1e361dee0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000500 R13: 00007fa1e361dea0 R14: 00000000000004c4 R15: 0000200000000d00 Allocated by task 2607: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] ____kasan_kmalloc mm/kasan/common.c:512 [inline] __kasan_kmalloc+0xda/0x110 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] __kmalloc+0x13d/0x2c0 mm/slub.c:4436 kmalloc include/linux/slab.h:624 [inline] __d_alloc+0xaf/0x6a0 fs/dcache.c:1765 d_alloc+0x4b/0x260 fs/dcache.c:1828 lookup_one_qstr_excl+0xcb/0x250 fs/namei.c:1567 filename_create+0x235/0x470 fs/namei.c:3844 do_mknodat+0xd7/0x7a0 fs/namei.c:3989 __do_sys_mknod fs/namei.c:4035 [inline] __se_sys_mknod fs/namei.c:4033 [inline] __x64_sys_mknod+0x8e/0xa0 fs/namei.c:4033 x64_sys_call+0x886/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:134 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff888111ea6000 which belongs to the cache kmalloc-rcl-4k of size 4096 The buggy address is located 3832 bytes to the right of 4096-byte region [ffff888111ea6000, ffff888111ea7000) The buggy address belongs to the page: page:ffffea000447a800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888111ea2000 pfn:0x111ea0 head:ffffea000447a800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 ffff88810004c780 raw: ffff888111ea2000 0000000080040002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 554, ts 28082664538, free_ts 0 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x2d3a/0x2dc0 mm/page_alloc.c:4485 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5822 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa1/0x4d0 mm/slub.c:2000 ___slab_alloc+0x381/0x810 mm/slub.c:3033 __slab_alloc+0x49/0x90 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] __kmalloc+0x16a/0x2c0 mm/slub.c:4432 kmalloc include/linux/slab.h:624 [inline] __d_alloc+0xaf/0x6a0 fs/dcache.c:1765 d_alloc fs/dcache.c:1828 [inline] d_alloc_parallel+0xe2/0x1370 fs/dcache.c:2584 __lookup_slow+0x14c/0x410 fs/namei.c:1656 lookup_slow+0x57/0x70 fs/namei.c:1688 walk_component+0x325/0x460 fs/namei.c:1984 lookup_last fs/namei.c:2439 [inline] path_lookupat+0x180/0x490 fs/namei.c:2463 filename_lookup+0x214/0x540 fs/namei.c:2492 do_linkat+0xed/0x750 fs/namei.c:4616 page_owner free stack trace missing Memory state around the buggy address: ffff888111ea7d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888111ea7e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888111ea7e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888111ea7f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888111ea7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== EXT4-fs warning (device loop1): ext4_enable_quotas:6477: Failed to enable quota tracking (type=0, err=-13, ino=3). Please run e2fsck to fix. EXT4-fs (loop1): mount failed