EXT4-fs (loop2): unmounting filesystem. ================================================================== BUG: KASAN: use-after-free in ext4_ext_rm_leaf fs/ext4/extents.c:2601 [inline] BUG: KASAN: use-after-free in ext4_ext_remove_space+0x2f43/0x3fb0 fs/ext4/extents.c:2939 Read of size 4 at addr ffff888127a1fdb8 by task syz-executor/529 CPU: 0 PID: 529 Comm: syz-executor Not tainted 6.1.141-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106 print_address_description+0x71/0x210 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:427 kasan_report+0x122/0x150 mm/kasan/report.c:531 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:350 ext4_ext_rm_leaf fs/ext4/extents.c:2601 [inline] ext4_ext_remove_space+0x2f43/0x3fb0 fs/ext4/extents.c:2939 ext4_ext_truncate+0x200/0x320 fs/ext4/extents.c:4469 ext4_truncate+0x9a6/0xf90 fs/ext4/inode.c:4289 ext4_evict_inode+0xc42/0x13d0 fs/ext4/inode.c:286 evict+0x493/0x890 fs/inode.c:705 iput_final fs/inode.c:1834 [inline] iput+0x639/0x840 fs/inode.c:1860 do_unlinkat+0x356/0x540 fs/namei.c:4397 __do_sys_unlink fs/namei.c:4438 [inline] __se_sys_unlink fs/namei.c:4436 [inline] __x64_sys_unlink+0x49/0x50 fs/namei.c:4436 x64_sys_call+0x958/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:88 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f677bf8df57 Code: 73 01 c3 48 c7 c1 a8 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 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffec2e00458 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f677bf8df57 RDX: 00007ffec2e00480 RSI: 00007ffec2e00510 RDI: 00007ffec2e00510 RBP: 00007ffec2e00510 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffec2e01600 R13: 00007f677c010b55 R14: 000000000000d3b7 R15: 00007ffec2e026d0 The buggy address belongs to the physical page: page:ffffea00049e87c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x127a1f flags: 0x4000000000000000(zone=1) raw: 4000000000000000 ffffea00049e8808 ffffea00049e8788 0000000000000000 raw: 0000000000000001 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 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO), pid 468, tgid 468 (syz-executor), ts 51110600331, free_ts 51144337954 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1d0/0x1f0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x2e63/0x2ef0 mm/page_alloc.c:4328 __alloc_pages+0x235/0x4b0 mm/page_alloc.c:5614 __folio_alloc+0x12/0x40 mm/page_alloc.c:5646 __folio_alloc_node include/linux/gfp.h:246 [inline] folio_alloc include/linux/gfp.h:275 [inline] alloc_page_vma include/linux/gfp.h:284 [inline] do_anonymous_page mm/memory.c:4191 [inline] handle_pte_fault mm/memory.c:5029 [inline] __handle_mm_fault mm/memory.c:5173 [inline] handle_mm_fault+0x17b4/0x23d0 mm/memory.c:5294 do_user_addr_fault+0x530/0xaf0 arch/x86/mm/fault.c:1340 handle_page_fault arch/x86/mm/fault.c:1431 [inline] exc_page_fault+0x51/0xb0 arch/x86/mm/fault.c:1487 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:608 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1532 [inline] free_unref_page_prepare+0x742/0x750 mm/page_alloc.c:3384 free_unref_page_list+0xba/0x7c0 mm/page_alloc.c:3525 release_pages+0xad1/0xb20 mm/swap.c:1035 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:314 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline] tlb_flush_mmu_free mm/mmu_gather.c:254 [inline] tlb_flush_mmu mm/mmu_gather.c:261 [inline] tlb_finish_mmu+0x1aa/0x370 mm/mmu_gather.c:361 unmap_region+0x272/0x2c0 mm/mmap.c:2331 do_mas_align_munmap+0x83f/0xf20 mm/mmap.c:2580 do_mas_munmap+0x241/0x2b0 mm/mmap.c:2638 __vm_munmap+0x18a/0x290 mm/mmap.c:2924 __do_sys_munmap mm/mmap.c:2949 [inline] __se_sys_munmap mm/mmap.c:2946 [inline] __x64_sys_munmap+0x60/0x70 mm/mmap.c:2946 x64_sys_call+0x8a/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:12 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff888127a1fc80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888127a1fd00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888127a1fd80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888127a1fe00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888127a1fe80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs error (device loop2): ext4_free_blocks:6210: comm syz-executor: Freeing blocks not in datazone - block = 111559400477632, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6210: comm syz-executor: Freeing blocks not in datazone - block = 111559400453219, count = 24421 EXT4-fs error (device loop2): ext4_free_blocks:6210: comm syz-executor: Freeing blocks not in datazone - block = 111559400453216, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6210: comm syz-executor: Freeing blocks not in datazone - block = 120368058782928, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6210: comm syz-executor: Freeing blocks not in datazone - block = 120368058753396, count = 29547 EXT4-fs error (device loop2): ext4_free_blocks:6210: comm syz-executor: Freeing blocks not in datazone - block = 120368058753392, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6210: comm syz-executor: Freeing blocks not in datazone - block = 53000437011296, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6210: comm syz-executor: Freeing blocks not in datazone - block = 53000436998451, count = 12854 EXT4-fs (loop2): unmounting filesystem. EXT4-fs (loop2): unmounting filesystem. EXT4-fs (loop2): unmounting filesystem. EXT4-fs (loop2): unmounting filesystem. EXT4-fs (loop2): unmounting filesystem. EXT4-fs (loop2): unmounting filesystem. EXT4-fs (loop2): unmounting filesystem. EXT4-fs error (device loop2): ext4_free_blocks:6210: comm syz-executor: Freeing blocks not in datazone - block = 112589148534886, count = 26214 EXT4-fs error (device loop2): ext4_free_blocks:6210: comm syz-executor: Freeing blocks not in datazone - block = 112589148534880, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6210: comm syz-executor: Freeing blocks not in datazone - block = 127953072346816, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6210: comm syz-executor: Freeing blocks not in datazone - block = 127953072317025, count = 29793 EXT4-fs error (device loop2): ext4_free_blocks:6210: comm syz-executor: Freeing blocks not in datazone - block = 127953072317024, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6210: comm syz-executor: Freeing blocks not in datazone - block = 119242777551552, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6210: comm syz-executor: Freeing blocks not in datazone - block = 119242777523297, count = 28257 EXT4-fs error (device loop2): ext4_free_blocks:6210: comm syz-executor: Freeing blocks not in datazone - block = 119242777523296, count = 16