EXT4-fs (loop0): 1 truncate cleaned up EXT4-fs (loop0): mounted filesystem without journal. Opts: max_batch_time=0x0000000000000004,max_batch_time=0x0000000000000002,resuid=0x0000000000000000,block_validity,errors=remount-ro,nombcache,. Quota mode: none. ================================================================== BUG: KASAN: use-after-free in ext4_read_inline_data fs/ext4/inline.c:210 [inline] BUG: KASAN: use-after-free in ext4_convert_inline_data_nolock+0x313/0xcd0 fs/ext4/inline.c:1255 Read of size 68 at addr ffff8881372e1c80 by task syz.0.1706/6215 CPU: 1 PID: 6215 Comm: syz.0.1706 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 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+0x10f/0x150 mm/kasan/report.c:444 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189 memcpy+0x2d/0x70 mm/kasan/shadow.c:65 ext4_read_inline_data fs/ext4/inline.c:210 [inline] ext4_convert_inline_data_nolock+0x313/0xcd0 fs/ext4/inline.c:1255 ext4_try_add_inline_entry+0x737/0xa70 fs/ext4/inline.c:1381 ext4_add_entry+0x711/0x1020 fs/ext4/namei.c:2458 ext4_mkdir+0x520/0xc90 fs/ext4/namei.c:3081 vfs_mkdir+0x38b/0x590 fs/namei.c:4073 do_mkdirat+0x174/0x4d0 fs/namei.c:4098 __do_sys_mkdirat fs/namei.c:4113 [inline] __se_sys_mkdirat fs/namei.c:4111 [inline] __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4111 x64_sys_call+0x37e/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:259 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: 0033:0x7ff62f632cc7 Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 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:00007ff62e08de58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007ff62e08dee0 RCX: 00007ff62f632cc7 RDX: 00000000000001ff RSI: 0000200000000080 RDI: 00000000ffffff9c RBP: 0000200000000140 R08: 0000200000000080 R09: 0000000000000000 R10: 0000200000000140 R11: 0000000000000246 R12: 0000200000000080 R13: 00007ff62e08dea0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 400: 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+0xb7/0xe0 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 getname_flags+0xba/0x510 fs/namei.c:138 user_path_at_empty+0x2f/0x1c0 fs/namei.c:2890 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0x109/0xa20 fs/stat.c:221 vfs_fstatat fs/stat.c:243 [inline] __do_sys_newfstatat fs/stat.c:411 [inline] __se_sys_newfstatat+0x10e/0x3d0 fs/stat.c:405 __x64_sys_newfstatat+0x9b/0xb0 fs/stat.c:405 x64_sys_call+0x2c1/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:263 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 Freed by task 400: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754 slab_free mm/slub.c:3526 [inline] kmem_cache_free+0x100/0x320 mm/slub.c:3544 putname fs/namei.c:271 [inline] user_path_at_empty+0x162/0x1c0 fs/namei.c:2893 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0x109/0xa20 fs/stat.c:221 vfs_fstatat fs/stat.c:243 [inline] __do_sys_newfstatat fs/stat.c:411 [inline] __se_sys_newfstatat+0x10e/0x3d0 fs/stat.c:405 __x64_sys_newfstatat+0x9b/0xb0 fs/stat.c:405 x64_sys_call+0x2c1/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:263 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 ffff8881372e1100 which belongs to the cache names_cache of size 4096 The buggy address is located 2944 bytes inside of 4096-byte region [ffff8881372e1100, ffff8881372e2100) The buggy address belongs to the page: page:ffffea0004dcb800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1372e0 head:ffffea0004dcb800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 ffff8881001c4d80 raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 400, ts 183470562179, free_ts 183454524315 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+0x2c3a/0x2cd0 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+0xa0/0x4d0 mm/slub.c:2000 ___slab_alloc+0x3ac/0x840 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 getname_flags+0xba/0x510 fs/namei.c:138 user_path_at_empty+0x2f/0x1c0 fs/namei.c:2890 do_readlinkat+0xd9/0x490 fs/stat.c:442 __do_sys_readlink fs/stat.c:475 [inline] __se_sys_readlink fs/stat.c:472 [inline] __x64_sys_readlink+0x7f/0x90 fs/stat.c:472 x64_sys_call+0x93c/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:90 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 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:5898 __free_slab+0xe5/0x1e0 mm/slub.c:2025 free_slab mm/slub.c:2040 [inline] discard_slab mm/slub.c:2046 [inline] __unfreeze_partials+0x15a/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/0xe0 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 getname_flags+0xba/0x510 fs/namei.c:138 getname+0x19/0x20 fs/namei.c:217 Memory state around the buggy address: ffff8881372e1b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881372e1c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881372e1c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881372e1d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881372e1d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== EXT4-fs error (device loop0): ext4_check_all_de:667: inode #12: block 7: comm syz.0.1706: bad entry in directory: directory entry overrun - offset=0, inode=901261600, rec_len=7976, size=124 fake=0 EXT4-fs (loop0): Remounting filesystem read-only EXT4-fs error (device loop0): xattr_find_entry:297: inode #12: comm syz.0.1706: corrupted xattr entries EXT4-fs (loop0): Remounting filesystem read-only EXT4-fs error (device loop0): xattr_find_entry:297: inode #12: comm syz.0.1706: corrupted xattr entries EXT4-fs (loop0): Remounting filesystem read-only