loop3: detected capacity change from 0 to 1024 EXT4-fs (loop3): ext4_check_descriptors: Block bitmap for group 0 overlaps block group descriptors EXT4-fs (loop3): ext4_check_descriptors: Checksum for group 0 failed (38281!=20869) ================================================================== 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 ffff8881211cfef8 by task syz.3.3073/6731 CPU: 1 PID: 6731 Comm: syz.3.3073 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 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_get_journal_inode+0x33/0x1c0 fs/ext4/super.c:5176 ext4_calculate_overhead+0xf32/0x1260 fs/ext4/super.c:3809 ext4_fill_super+0x6a74/0x8bd0 fs/ext4/super.c:4835 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: 0033:0x7ff86f22820a 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:00007ff86dc81e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ff86dc81ee0 RCX: 00007ff86f22820a RDX: 0000200000000080 RSI: 0000200000000140 RDI: 00007ff86dc81ea0 RBP: 0000200000000080 R08: 00007ff86dc81ee0 R09: 0000000000000011 R10: 0000000000000011 R11: 0000000000000246 R12: 0000200000000140 R13: 00007ff86dc81ea0 R14: 0000000000000631 R15: 0000200000000780 Allocated by task 1287: 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_slab_alloc+0xbd/0xf0 mm/kasan/common.c:466 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550 slab_alloc_node mm/slub.c:3245 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260 alloc_inode fs/inode.c:266 [inline] iget_locked+0x1d7/0x7e0 fs/inode.c:1318 kernfs_get_inode+0x4b/0x6f0 fs/kernfs/inode.c:254 kernfs_iop_lookup+0x20f/0x310 fs/kernfs/dir.c:1160 lookup_open fs/namei.c:3448 [inline] open_last_lookups fs/namei.c:3540 [inline] path_openat+0xfc9/0x2f20 fs/namei.c:3747 do_filp_open+0x1e2/0x410 fs/namei.c:3777 do_sys_openat2+0x15e/0x7f0 fs/open.c:1236 do_sys_open fs/open.c:1252 [inline] __do_sys_openat fs/open.c:1268 [inline] __se_sys_openat fs/open.c:1263 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1263 x64_sys_call+0x219/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258 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 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu_common kernel/rcu/tree.c:3011 [inline] call_rcu+0x10b/0xf80 kernel/rcu/tree.c:3129 destroy_inode fs/inode.c:319 [inline] evict+0x834/0x8d0 fs/inode.c:665 iput_final fs/inode.c:1779 [inline] iput+0x635/0x7c0 fs/inode.c:1805 dentry_unlink_inode+0x32f/0x3e0 fs/dcache.c:380 __dentry_kill+0x44f/0x650 fs/dcache.c:586 shrink_dentry_list+0x38e/0x500 fs/dcache.c:1181 shrink_dcache_parent+0xa9/0x270 fs/dcache.c:-1 d_invalidate+0x113/0x260 fs/dcache.c:1717 lookup_fast+0x5e1/0x720 fs/namei.c:1636 walk_component+0x80/0x460 fs/namei.c:1980 link_path_walk+0x665/0xd60 fs/namei.c:-1 path_openat+0x27b/0x2f20 fs/namei.c:3746 do_filp_open+0x1e2/0x410 fs/namei.c:3777 do_sys_openat2+0x15e/0x7f0 fs/open.c:1236 do_sys_open fs/open.c:1252 [inline] __do_sys_openat fs/open.c:1268 [inline] __se_sys_openat fs/open.c:1263 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1263 x64_sys_call+0x219/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258 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 Second to last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu_common kernel/rcu/tree.c:3011 [inline] call_rcu+0x10b/0xf80 kernel/rcu/tree.c:3129 destroy_inode fs/inode.c:319 [inline] evict+0x834/0x8d0 fs/inode.c:665 iput_final fs/inode.c:1779 [inline] iput+0x635/0x7c0 fs/inode.c:1805 dentry_unlink_inode+0x32f/0x3e0 fs/dcache.c:380 __dentry_kill+0x44f/0x650 fs/dcache.c:586 shrink_dentry_list+0x38e/0x500 fs/dcache.c:1181 shrink_dcache_parent+0xa9/0x270 fs/dcache.c:-1 d_invalidate+0x113/0x260 fs/dcache.c:1717 lookup_fast+0x5e1/0x720 fs/namei.c:1636 walk_component+0x80/0x460 fs/namei.c:1980 link_path_walk+0x665/0xd60 fs/namei.c:-1 path_openat+0x27b/0x2f20 fs/namei.c:3746 do_filp_open+0x1e2/0x410 fs/namei.c:3777 do_sys_openat2+0x15e/0x7f0 fs/open.c:1236 do_sys_open fs/open.c:1252 [inline] __do_sys_openat fs/open.c:1268 [inline] __se_sys_openat fs/open.c:1263 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1263 x64_sys_call+0x219/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258 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 ffff8881211cfa70 which belongs to the cache inode_cache of size 752 The buggy address is located 408 bytes to the right of 752-byte region [ffff8881211cfa70, ffff8881211cfd60) The buggy address belongs to the page: page:ffffea0004847300 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8881211ccdc0 pfn:0x1211cc head:ffffea0004847300 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea000484b200 0000000200000002 ffff8881001c4000 raw: ffff8881211ccdc0 000000008012000a 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Reclaimable, gfp_mask 0x1d20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 1287, ts 149080945905, free_ts 132776813900 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:5808 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] kmem_cache_alloc+0x138/0x260 mm/slub.c:3260 alloc_inode fs/inode.c:266 [inline] iget_locked+0x1d7/0x7e0 fs/inode.c:1318 kernfs_get_inode+0x4b/0x6f0 fs/kernfs/inode.c:254 kernfs_iop_lookup+0x20f/0x310 fs/kernfs/dir.c:1160 __lookup_slow+0x2b8/0x410 fs/namei.c:1671 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 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534 free_unref_page+0xae/0x540 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5884 __free_slab+0xe8/0x1e0 mm/slub.c:2025 free_slab mm/slub.c:2040 [inline] discard_slab mm/slub.c:2046 [inline] __unfreeze_partials+0x160/0x190 mm/slub.c:2532 put_cpu_partial+0xc6/0x120 mm/slub.c:2612 __slab_free+0x1d4/0x290 mm/slub.c:3395 do_slab_free mm/slub.c:3514 [inline] ___cache_free+0x104/0x120 mm/slub.c:3535 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xf0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550 slab_alloc_node mm/slub.c:3245 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260 __d_alloc+0x2d/0x6a0 fs/dcache.c:1749 d_alloc+0x4b/0x260 fs/dcache.c:1828 Memory state around the buggy address: ffff8881211cfd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881211cfe00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881211cfe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8881211cff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881211cff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== EXT4-fs (loop3): invalid journal inode EXT4-fs (loop3): can't get journal size EXT4-fs (loop3): mounted filesystem without journal. Opts: inode_readahead_blks=0x0000000000000008,noinit_itable,max_dir_size_kb=0x0000000000000005,noblock_validity,noload,data=writeback,,errors=continue. Quota mode: writeback.