and is ignored by this kernel. Remove the mand option from the mount to silence this warning. ======================================================= EXT4-fs: Ignoring removed oldalloc option EXT4-fs: Ignoring removed orlov option EXT4-fs (loop2): mounted filesystem without journal. Quota mode: writeback. ================================================================== BUG: KASAN: use-after-free in ext4_ext_rm_leaf fs/ext4/extents.c:2602 [inline] BUG: KASAN: use-after-free in ext4_ext_remove_space+0x348b/0x40d0 fs/ext4/extents.c:2940 Read of size 4 at addr ffff888129381c18 by task syz.2.17/373 CPU: 1 PID: 373 Comm: syz.2.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x71/0x200 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:420 kasan_report+0x122/0x150 mm/kasan/report.c:524 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:350 ext4_ext_rm_leaf fs/ext4/extents.c:2602 [inline] ext4_ext_remove_space+0x348b/0x40d0 fs/ext4/extents.c:2940 ext4_ext_truncate+0x200/0x320 fs/ext4/extents.c:4470 ext4_truncate+0x9be/0xfb0 fs/ext4/inode.c:4297 ext4_setattr+0x10f1/0x1a60 fs/ext4/inode.c:5647 notify_change+0xcc3/0xf80 fs/attr.c:499 do_truncate+0x1ac/0x240 fs/open.c:66 handle_truncate fs/namei.c:3292 [inline] do_open fs/namei.c:3637 [inline] path_openat+0x28f0/0x2f80 fs/namei.c:3790 do_filp_open+0x1f1/0x430 fs/namei.c:3817 do_sys_openat2+0x15e/0x810 fs/open.c:1341 do_sys_open fs/open.c:1357 [inline] __do_sys_creat fs/open.c:1435 [inline] __se_sys_creat fs/open.c:1429 [inline] __x64_sys_creat+0x8e/0xb0 fs/open.c:1429 x64_sys_call+0x116/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:86 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: 0033:0x7f0bf539acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007ffc62a8bcf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f0bf5615fa0 RCX: 00007f0bf539acb9 RDX: 0000000000000000 RSI: 0000000000000108 RDI: 0000200000000680 RBP: 00007f0bf5408bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0bf5615fac R14: 00007f0bf5615fa0 R15: 00007f0bf5615fa0 The buggy address belongs to the physical page: page:ffffea0004a4e040 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x129381 flags: 0x4000000000000000(zone=1) raw: 4000000000000000 dead000000000100 dead000000000122 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 0x8140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO|__GFP_CMA), pid 292, tgid 292 (syz-executor), ts 23190005450, free_ts 24742831008 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2643 prep_new_page+0x1c/0x110 mm/page_alloc.c:2650 get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4554 __alloc_pages+0x1d9/0x480 mm/page_alloc.c:5868 __folio_alloc+0x12/0x40 mm/page_alloc.c:5900 __folio_alloc_node include/linux/gfp.h:245 [inline] folio_alloc include/linux/gfp.h:274 [inline] alloc_page_vma include/linux/gfp.h:283 [inline] do_anonymous_page mm/memory.c:4283 [inline] handle_pte_fault mm/memory.c:5169 [inline] __handle_mm_fault mm/memory.c:5313 [inline] handle_mm_fault+0x1972/0x26c0 mm/memory.c:5453 do_user_addr_fault+0x905/0x1050 arch/x86/mm/fault.c:1323 handle_page_fault arch/x86/mm/fault.c:1466 [inline] exc_page_fault+0x51/0xb0 arch/x86/mm/fault.c:1522 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:26 [inline] free_pages_prepare mm/page_alloc.c:1551 [inline] free_pcp_prepare mm/page_alloc.c:1625 [inline] free_unref_page_prepare+0x742/0x750 mm/page_alloc.c:3589 free_unref_page_list+0x117/0x8c0 mm/page_alloc.c:3740 release_pages+0xaf2/0xb50 mm/swap.c:1048 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:315 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+0x2b7/0x320 mm/mmap.c:2419 do_mas_align_munmap+0xbed/0x1320 mm/mmap.c:2693 do_mas_munmap+0x241/0x2b0 mm/mmap.c:2751 __vm_munmap+0x1bd/0x330 mm/mmap.c:3050 __do_sys_munmap mm/mmap.c:3076 [inline] __se_sys_munmap mm/mmap.c:3072 [inline] __x64_sys_munmap+0x6b/0x80 mm/mmap.c:3072 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: ffff888129381b00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888129381b80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888129381c00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888129381c80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888129381d00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 55183558011280, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 55183557996849, count = 14437 EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 55183557996848, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 104592811931504, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 104592811909983, count = 21536 EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 104592811909968, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 112589185194640, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 112589185168440, count = 26214 EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 112589185168432, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 119254237302208, count = 16 EXT4-fs error: 33014 callbacks suppressed EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 62012422014864, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 62012421988660, count = 26214 EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 62012421988656, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 119251478963920, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 119251478934388, count = 29541 EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 119251478934384, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 111499019535056, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 111499019509604, count = 25459 EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 111499019509600, count = 16 EXT4-fs error (device loop2): ext4_free_blocks:6205: comm syz.2.17: Freeing blocks not in datazone - block = 109260482075072, count = 16