================================================================== BUG: KASAN: use-after-free in ext4_ext_binsearch fs/ext4/extents.c:827 [inline] BUG: KASAN: use-after-free in ext4_find_extent+0xbeb/0xe20 fs/ext4/extents.c:946 Read of size 4 at addr ffff88812287ad5c by task kworker/u4:3/361 CPU: 1 PID: 361 Comm: kworker/u4:3 Not tainted 5.15.185-syzkaller-1080583-ge678c93d43cc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 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+0xf1/0x140 mm/kasan/report.c:444 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 ext4_ext_binsearch fs/ext4/extents.c:827 [inline] ext4_find_extent+0xbeb/0xe20 fs/ext4/extents.c:946 ext4_ext_map_blocks+0x1de/0x6270 fs/ext4/extents.c:4165 ext4_map_blocks+0x97b/0x1b20 fs/ext4/inode.c:674 ext4_convert_unwritten_extents+0x2a2/0x5c0 fs/ext4/extents.c:4867 ext4_convert_unwritten_io_end_vec+0x103/0x180 fs/ext4/extents.c:4906 ext4_end_io_end fs/ext4/page-io.c:186 [inline] ext4_do_flush_completed_IO fs/ext4/page-io.c:259 [inline] ext4_end_io_rsv_work+0x2b9/0x600 fs/ext4/page-io.c:273 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472 kthread+0x411/0x500 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the page: page:ffffea00048a1e80 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x12287a flags: 0x4000000000000000(zone=1) raw: 4000000000000000 ffffea00048a1e48 ffffea00048a1d88 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 0x100dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO), pid 281, ts 24488071361, free_ts 25598696342 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+0x2cc5/0x2d50 mm/page_alloc.c:4485 __alloc_pages+0x18f/0x440 mm/page_alloc.c:5789 __alloc_pages_node include/linux/gfp.h:591 [inline] alloc_pages_node include/linux/gfp.h:605 [inline] alloc_pages include/linux/gfp.h:618 [inline] do_anonymous_page mm/memory.c:4068 [inline] handle_pte_fault+0xe89/0x2680 mm/memory.c:4908 __handle_mm_fault mm/memory.c:-1 [inline] do_handle_mm_fault+0x1a6d/0x1d50 mm/memory.c:5332 do_user_addr_fault+0x554/0x1180 arch/x86/mm/fault.c:1325 handle_page_fault arch/x86/mm/fault.c:1509 [inline] exc_page_fault+0x51/0xb0 arch/x86/mm/fault.c:1565 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:606 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_list+0x134/0x9d0 mm/page_alloc.c:3671 release_pages+0x1076/0x10d0 mm/swap.c:1009 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:320 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:240 [inline] tlb_flush_mmu+0xd6/0x180 mm/mmu_gather.c:247 zap_pte_range mm/memory.c:1525 [inline] zap_pmd_range mm/memory.c:1574 [inline] zap_pud_range mm/memory.c:1603 [inline] zap_p4d_range mm/memory.c:1624 [inline] unmap_page_range+0x1aea/0x1ce0 mm/memory.c:1645 unmap_single_vma mm/memory.c:1690 [inline] unmap_vmas+0x258/0x360 mm/memory.c:1722 exit_mmap+0x3e6/0x860 mm/mmap.c:3233 __mmput+0x93/0x320 kernel/fork.c:1180 mmput+0x50/0x150 kernel/fork.c:1203 exit_mm kernel/exit.c:554 [inline] do_exit+0x9ca/0x27a0 kernel/exit.c:867 do_group_exit+0x141/0x310 kernel/exit.c:1002 get_signal+0x66a/0x1480 kernel/signal.c:2907 arch_do_signal_or_restart+0xc1/0x10f0 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0xa7/0xe0 kernel/entry/common.c:178 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214 Memory state around the buggy address: ffff88812287ac00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88812287ac80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88812287ad00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88812287ad80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88812287ae00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs error (device loop1): ext4_map_blocks:740: inode #19: block 8: comm kworker/u4:3: lblock 8 mapped to illegal pblock 8 (length 1) EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4874: inode #19: block 8: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop1): __ext4_get_inode_loc:4352: comm kworker/u4:3: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop1) in ext4_reserve_inode_write:5866: Corrupt filesystem EXT4-fs error (device loop1): ext4_convert_unwritten_extents:4875: inode #19: comm kworker/u4:3: mark_inode_dirty error EXT4-fs (loop1): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs error (device loop1): ext4_map_blocks:740: inode #19: block 9: comm kworker/u4:3: lblock 9 mapped to illegal pblock 9 (length 1) EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4874: inode #19: block 9: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop1): __ext4_get_inode_loc:4352: comm kworker/u4:3: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop1) in ext4_reserve_inode_write:5866: Corrupt filesystem EXT4-fs error (device loop1): ext4_convert_unwritten_extents:4875: inode #19: comm kworker/u4:3: mark_inode_dirty error EXT4-fs (loop1): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs error (device loop3): __ext4_get_inode_loc:4352: comm kworker/u4:3: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop2): __ext4_get_inode_loc:4352: comm kworker/u4:3: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop2): __ext4_get_inode_loc:4352: comm kworker/u4:3: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop3): ext4_map_blocks:740: inode #19: block 198: comm kworker/u4:3: lblock 6 mapped to illegal pblock 198 (length 1) EXT4-fs warning (device loop3): ext4_convert_unwritten_extents:4874: inode #19: block 6: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop3): __ext4_get_inode_loc:4352: comm kworker/u4:3: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop3) in ext4_reserve_inode_write:5866: Corrupt filesystem EXT4-fs error (device loop3): ext4_convert_unwritten_extents:4875: inode #19: comm kworker/u4:3: mark_inode_dirty error EXT4-fs (loop3): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs error (device loop3): ext4_map_blocks:740: inode #19: block 7: comm kworker/u4:3: lblock 7 mapped to illegal pblock 7 (length 1) EXT4-fs warning (device loop3): ext4_convert_unwritten_extents:4874: inode #19: block 7: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop3): __ext4_get_inode_loc:4352: comm kworker/u4:3: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop3) in ext4_reserve_inode_write:5866: Corrupt filesystem EXT4-fs error (device loop3): ext4_convert_unwritten_extents:4875: inode #19: comm kworker/u4:3: mark_inode_dirty error EXT4-fs (loop3): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs error (device loop3): ext4_map_blocks:740: inode #19: block 8: comm kworker/u4:3: lblock 8 mapped to illegal pblock 8 (length 1) EXT4-fs warning (device loop3): ext4_convert_unwritten_extents:4874: inode #19: block 8: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop3): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop3): ext4_convert_unwritten_extents:4874: inode #19: block 9: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop3): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop3): ext4_convert_unwritten_extents:4874: inode #19: block 10: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop3): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop3): ext4_convert_unwritten_extents:4874: inode #19: block 11: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop3): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop3): ext4_convert_unwritten_extents:4874: inode #19: block 12: len 1: ext4_ext_map_blocks returned -28 EXT4-fs (loop3): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -28) EXT4-fs warning (device loop3): ext4_convert_unwritten_extents:4874: inode #19: block 13: len 1: ext4_ext_map_blocks returned -28 EXT4-fs (loop3): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -28) EXT4-fs warning (device loop3): ext4_convert_unwritten_extents:4874: inode #19: block 14: len 1: ext4_ext_map_blocks returned -117 EXT4-fs warning (device loop3): ext4_convert_unwritten_extents:4874: inode #19: block 15: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop5): __ext4_get_inode_loc:4352: comm kworker/u4:3: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop5): __ext4_get_inode_loc:4352: comm kworker/u4:3: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop1): __ext4_get_inode_loc:4352: comm kworker/u4:3: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop1): __ext4_get_inode_loc:4352: comm kworker/u4:3: Invalid inode table block 34360905424 in block_group 0