EXT4-fs (loop0): Remounting filesystem read-only EXT4-fs error (device loop0): ext4_lookup:1859: inode #12: comm syz-executor.0: deleted inode referenced: 13 ================================================================== BUG: KASAN: use-after-free in ext4_search_dir+0xf7/0x1b0 fs/ext4/namei.c:1543 Read of size 1 at addr ffff888117660355 by task syz-executor.0/11136 CPU: 1 PID: 11136 Comm: syz-executor.0 Not tainted 6.1.78-syzkaller-00021-g1a72e2f692ac #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x158/0x4e0 mm/kasan/report.c:427 kasan_report+0x13c/0x170 mm/kasan/report.c:531 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:348 ext4_search_dir+0xf7/0x1b0 fs/ext4/namei.c:1543 ext4_find_inline_entry+0x4b6/0x5e0 fs/ext4/inline.c:1722 __ext4_find_entry+0x2b0/0x1af0 fs/ext4/namei.c:1616 ext4_lookup_entry fs/ext4/namei.c:1771 [inline] ext4_lookup+0x176/0x740 fs/ext4/namei.c:1839 lookup_one_qstr_excl+0x143/0x290 fs/namei.c:1604 filename_create+0x28e/0x530 fs/namei.c:3878 do_mkdirat+0xbd/0x450 fs/namei.c:4122 __do_sys_mkdirat fs/namei.c:4147 [inline] __se_sys_mkdirat fs/namei.c:4145 [inline] __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4145 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f19e627bba7 Code: 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 02 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f19e6f5bef8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f19e6f5bf80 RCX: 00007f19e627bba7 RDX: 00000000000001ff RSI: 0000000020000480 RDI: 00000000ffffff9c RBP: 0000000020000440 R08: 00000000200014c0 R09: 0000000000000000 R10: 0000000020000440 R11: 0000000000000246 R12: 0000000020000480 R13: 00007f19e6f5bf40 R14: 0000000000000000 R15: 0000000020000580 Allocated by task 102: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:333 kasan_slab_alloc include/linux/kasan.h:202 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:768 slab_alloc_node mm/slub.c:3421 [inline] slab_alloc mm/slub.c:3429 [inline] __kmem_cache_alloc_lru mm/slub.c:3436 [inline] kmem_cache_alloc+0x175/0x2c0 mm/slub.c:3445 getname_flags+0xba/0x520 fs/namei.c:139 getname+0x19/0x20 fs/namei.c:218 do_sys_openat2+0xd7/0x850 fs/open.c:1335 do_sys_open fs/open.c:1357 [inline] __do_sys_openat fs/open.c:1373 [inline] __se_sys_openat fs/open.c:1368 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1368 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 102: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x131/0x180 mm/kasan/common.c:241 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:249 kasan_slab_free include/linux/kasan.h:178 [inline] slab_free_hook mm/slub.c:1745 [inline] slab_free_freelist_hook mm/slub.c:1771 [inline] slab_free mm/slub.c:3684 [inline] kmem_cache_free+0x291/0x510 mm/slub.c:3706 putname+0xfa/0x150 fs/namei.c:272 do_sys_openat2+0x466/0x850 fs/open.c:1350 do_sys_open fs/open.c:1357 [inline] __do_sys_openat fs/open.c:1373 [inline] __se_sys_openat fs/open.c:1368 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1368 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888117660000 which belongs to the cache names_cache of size 4096 The buggy address is located 853 bytes inside of 4096-byte region [ffff888117660000, ffff888117661000) The buggy address belongs to the physical page: page:ffffea00045d9800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x117660 head:ffffea00045d9800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 ffff8881002a1b00 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 102, tgid 102 (udevd), ts 2158001956923, free_ts 2143439208932 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x213/0x220 mm/page_alloc.c:2590 prep_new_page+0x1b/0x110 mm/page_alloc.c:2597 get_page_from_freelist+0x27ea/0x2870 mm/page_alloc.c:4425 __alloc_pages+0x3a1/0x780 mm/page_alloc.c:5712 alloc_slab_page+0x6c/0xf0 allocate_slab mm/slub.c:1962 [inline] new_slab+0x90/0x3e0 mm/slub.c:2015 ___slab_alloc+0x6f9/0xb80 mm/slub.c:3203 __slab_alloc+0x5d/0xa0 mm/slub.c:3302 slab_alloc_node mm/slub.c:3387 [inline] slab_alloc mm/slub.c:3429 [inline] __kmem_cache_alloc_lru mm/slub.c:3436 [inline] kmem_cache_alloc+0x1b9/0x2c0 mm/slub.c:3445 getname_flags+0xba/0x520 fs/namei.c:139 vfs_fstatat fs/stat.c:266 [inline] __do_sys_newfstatat fs/stat.c:437 [inline] __se_sys_newfstatat+0xe2/0x7b0 fs/stat.c:431 __x64_sys_newfstatat+0x9b/0xb0 fs/stat.c:431 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1498 [inline] free_pcp_prepare mm/page_alloc.c:1572 [inline] free_unref_page_prepare+0x83d/0x850 mm/page_alloc.c:3498 free_unref_page+0xb2/0x5c0 mm/page_alloc.c:3594 free_the_page mm/page_alloc.c:798 [inline] __free_pages+0x61/0xf0 mm/page_alloc.c:5801 __free_slab+0xce/0x1a0 mm/slub.c:2039 free_slab mm/slub.c:2054 [inline] discard_slab mm/slub.c:2060 [inline] __unfreeze_partials+0x165/0x1a0 mm/slub.c:2609 put_cpu_partial+0xa9/0x100 mm/slub.c:2685 __slab_free+0x1c8/0x280 mm/slub.c:3561 do_slab_free mm/slub.c:3638 [inline] ___cache_free+0xc6/0xd0 mm/slub.c:3691 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0xc5/0x140 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x15a/0x180 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x24/0x80 mm/kasan/common.c:310 kasan_slab_alloc include/linux/kasan.h:202 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:768 slab_alloc_node mm/slub.c:3421 [inline] slab_alloc mm/slub.c:3429 [inline] __kmem_cache_alloc_lru mm/slub.c:3436 [inline] kmem_cache_alloc_lru+0x102/0x220 mm/slub.c:3452 alloc_inode_sb include/linux/fs.h:3187 [inline] sock_alloc_inode+0x28/0xc0 net/socket.c:304 alloc_inode fs/inode.c:261 [inline] new_inode_pseudo+0x65/0x1d0 fs/inode.c:1020 sock_alloc net/socket.c:629 [inline] __sock_create+0x135/0x760 net/socket.c:1504 Memory state around the buggy address: ffff888117660200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888117660280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888117660300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888117660380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888117660400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================