EXT4-fs (loop5): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) ================================================================== BUG: KASAN: use-after-free in ext4_ext_binsearch fs/ext4/extents.c:826 [inline] BUG: KASAN: use-after-free in ext4_find_extent+0xbeb/0xe20 fs/ext4/extents.c:945 Read of size 4 at addr ffff88812422ee9c by task kworker/u4:2/49 CPU: 0 PID: 49 Comm: kworker/u4:2 Not tainted 5.10.237-syzkaller-1007464-g7e2543346ff7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x169/0x1d8 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0xe2/0x130 mm/kasan/report.c:452 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 ext4_ext_binsearch fs/ext4/extents.c:826 [inline] ext4_find_extent+0xbeb/0xe20 fs/ext4/extents.c:945 ext4_ext_map_blocks+0x1de/0x5d40 fs/ext4/extents.c:4159 ext4_map_blocks+0x978/0x1bc0 fs/ext4/inode.c:674 ext4_convert_unwritten_extents+0x21c/0x3f0 fs/ext4/extents.c:4860 ext4_convert_unwritten_io_end_vec+0x103/0x180 fs/ext4/extents.c:4899 ext4_end_io_end fs/ext4/page-io.c:189 [inline] ext4_do_flush_completed_IO fs/ext4/page-io.c:262 [inline] ext4_end_io_rsv_work+0x2b9/0x600 fs/ext4/page-io.c:276 process_one_work+0x6e1/0xba0 kernel/workqueue.c:2301 worker_thread+0xa6a/0x13b0 kernel/workqueue.c:2447 kthread+0x346/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 The buggy address belongs to the page: page:ffffea0004908b80 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x12422e flags: 0x4000000000000000() raw: 4000000000000000 ffffea0004908b48 ffffea0004908d48 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 0x8100dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|0x8000000), pid 356, ts 51424729508, free_ts 51426034359 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2235/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x268/0x5f0 mm/page_alloc.c:5349 __alloc_pages include/linux/gfp.h:544 [inline] __alloc_pages_node include/linux/gfp.h:557 [inline] alloc_pages_node include/linux/gfp.h:571 [inline] alloc_pages include/linux/gfp.h:590 [inline] do_anonymous_page mm/memory.c:3963 [inline] handle_pte_fault+0x1719/0x3750 mm/memory.c:4786 __handle_mm_fault mm/memory.c:4944 [inline] handle_mm_fault+0xf3f/0x16a0 mm/memory.c:5358 do_user_addr_fault+0x5a2/0xc80 arch/x86/mm/fault.c:1362 handle_page_fault arch/x86/mm/fault.c:1428 [inline] exc_page_fault+0x5a/0xc0 arch/x86/mm/fault.c:1484 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] free_pcp_prepare mm/page_alloc.c:1421 [inline] free_unref_page_prepare+0x2b7/0x2d0 mm/page_alloc.c:3336 free_unref_page_list+0x12e/0x9b0 mm/page_alloc.c:3443 release_pages+0xe38/0xe80 mm/swap.c:1103 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:356 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:240 [inline] tlb_flush_mmu mm/mmu_gather.c:247 [inline] tlb_finish_mmu+0x175/0x300 mm/mmu_gather.c:326 unmap_region+0x32c/0x380 mm/mmap.c:2799 __do_munmap+0x63c/0x850 mm/mmap.c:3029 __vm_munmap mm/mmap.c:3082 [inline] __do_sys_munmap mm/mmap.c:3108 [inline] __se_sys_munmap+0x127/0x1b0 mm/mmap.c:3104 __x64_sys_munmap+0x5b/0x70 mm/mmap.c:3104 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Memory state around the buggy address: ffff88812422ed80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88812422ee00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88812422ee80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88812422ef00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88812422ef80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs warning (device loop5): ext4_convert_unwritten_extents:4867: inode #19: block 40: len 1: ext4_ext_map_blocks returned -28 EXT4-fs error (device loop5): __ext4_get_inode_loc:4438: comm kworker/u4:2: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop5) in ext4_reserve_inode_write:5932: Corrupt filesystem EXT4-fs error (device loop5): ext4_convert_unwritten_extents:4868: inode #19: comm kworker/u4:2: mark_inode_dirty error EXT4-fs (loop5): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -28) EXT4-fs error (device loop5): ext4_ext_split:1073: inode #19: comm kworker/u4:2: p_ext > EXT_MAX_EXTENT! EXT4-fs warning (device loop5): ext4_convert_unwritten_extents:4867: inode #19: block 41: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop5): __ext4_get_inode_loc:4438: comm kworker/u4:2: Invalid inode table block 34360905424 in block_group 0 EXT4-fs (loop5): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs error (device loop2): ext4_map_blocks:740: inode #19: block 225: comm kworker/u4:2: lblock 17 mapped to illegal pblock 225 (length 1) EXT4-fs warning (device loop2): ext4_convert_unwritten_extents:4867: inode #19: block 17: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop2): __ext4_get_inode_loc:4438: comm kworker/u4:2: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop2) in ext4_reserve_inode_write:5932: Corrupt filesystem EXT4-fs error (device loop2): ext4_convert_unwritten_extents:4868: inode #19: comm kworker/u4:2: mark_inode_dirty error EXT4-fs (loop2): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs error (device loop3): __ext4_get_inode_loc:4438: comm kworker/u4:2: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop3): __ext4_get_inode_loc:4438: comm kworker/u4:2: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop1): __ext4_get_inode_loc:4438: comm kworker/u4:2: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop3): __ext4_get_inode_loc:4438: comm kworker/u4:2: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop5): __ext4_get_inode_loc:4438: comm kworker/u4:2: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop2): ext4_map_blocks:740: inode #19: block 237: comm kworker/u4:2: lblock 29 mapped to illegal pblock 237 (length 1) EXT4-fs warning (device loop2): ext4_convert_unwritten_extents:4867: inode #19: block 29: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop2): __ext4_get_inode_loc:4438: comm kworker/u4:2: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop2) in ext4_reserve_inode_write:5932: Corrupt filesystem EXT4-fs error (device loop2): ext4_convert_unwritten_extents:4868: inode #19: comm kworker/u4:2: mark_inode_dirty error EXT4-fs (loop2): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs error (device loop0): __ext4_get_inode_loc:4438: comm kworker/u4:2: Invalid inode table block 34360905424 in block_group 0