================================================================== BUG: KASAN: use-after-free in ext4_ext_binsearch fs/ext4/extents.c:826 [inline] BUG: KASAN: use-after-free in ext4_find_extent+0xbab/0xdb0 fs/ext4/extents.c:945 Read of size 4 at addr ffff888123cc3a58 by task kworker/u4:1/9 CPU: 1 PID: 9 Comm: kworker/u4:1 Not tainted 5.10.222-syzkaller-1003210-gfd58936f3c1f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x179/0x1c0 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+0xbab/0xdb0 fs/ext4/extents.c:945 ext4_ext_map_blocks+0x26a/0x6ee0 fs/ext4/extents.c:4137 ext4_map_blocks+0xa65/0x1d10 fs/ext4/inode.c:644 ext4_convert_unwritten_extents+0x2a3/0x5a0 fs/ext4/extents.c:4838 ext4_convert_unwritten_io_end_vec+0x104/0x180 fs/ext4/extents.c:4877 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+0x358/0x690 fs/ext4/page-io.c:276 process_one_work+0x6dc/0xbd0 kernel/workqueue.c:2301 worker_thread+0xaea/0x1510 kernel/workqueue.c:2447 kthread+0x34b/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:ffffea00048f30c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x123cc3 flags: 0x4000000000000000() 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 0x101cca(GFP_HIGHUSER_MOVABLE|__GFP_WRITE), pid 449, ts 55542557619, free_ts 56256684110 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x166/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348 __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] __page_cache_alloc include/linux/pagemap.h:290 [inline] pagecache_get_page+0x669/0x950 mm/filemap.c:1848 grab_cache_page_write_begin+0x5d/0xa0 mm/filemap.c:3459 ext4_da_write_begin+0x587/0xf60 fs/ext4/inode.c:3038 generic_perform_write+0x2cd/0x570 mm/filemap.c:3509 ext4_buffered_write_iter+0x482/0x610 fs/ext4/file.c:271 ext4_file_write_iter+0x193/0x1c80 fs/ext4/file.c:685 call_write_iter include/linux/fs.h:2021 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0xb4c/0xe70 fs/read_write.c:605 ksys_write+0x199/0x2c0 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:667 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb 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+0x2ae/0x2d0 mm/page_alloc.c:3336 free_unref_page_list+0x122/0xb20 mm/page_alloc.c:3443 release_pages+0xea0/0xef0 mm/swap.c:1103 __pagevec_release+0x84/0x100 mm/swap.c:1123 pagevec_release include/linux/pagevec.h:88 [inline] truncate_inode_pages_range+0xa81/0x1ae0 mm/truncate.c:367 truncate_inode_pages mm/truncate.c:473 [inline] truncate_inode_pages_final+0xc1/0xd0 mm/truncate.c:524 ext4_evict_inode+0x4e0/0x1730 fs/ext4/inode.c:225 evict+0x2a3/0x6c0 fs/inode.c:577 iput_final fs/inode.c:1697 [inline] iput+0x632/0x7e0 fs/inode.c:1723 do_unlinkat+0x48e/0x8b0 fs/namei.c:4042 __do_sys_unlink fs/namei.c:4082 [inline] __se_sys_unlink fs/namei.c:4080 [inline] __x64_sys_unlink+0x49/0x50 fs/namei.c:4080 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb Memory state around the buggy address: ffff888123cc3900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888123cc3980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888123cc3a00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888123cc3a80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888123cc3b00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs error (device loop0): ext4_map_blocks:710: inode #19: block 2: comm kworker/u4:1: lblock 2 mapped to illegal pblock 2 (length 1) EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4845: inode #19: block 2: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4845: inode #19: block 3: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4845: inode #19: block 4: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4845: inode #19: block 5: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4845: inode #19: block 6: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4845: inode #19: block 7: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4845: inode #19: block 8: len 1: ext4_ext_map_blocks returned -117 EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4845: inode #19: block 9: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop1): __ext4_get_inode_loc:4409: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop4): ext4_map_blocks:710: inode #19: block 202: comm kworker/u4:1: lblock 10 mapped to illegal pblock 202 (length 1) EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4845: inode #19: block 10: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop4): __ext4_get_inode_loc:4409: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop4) in ext4_reserve_inode_write:5869: Corrupt filesystem EXT4-fs error (device loop4): ext4_convert_unwritten_extents:4846: inode #19: comm kworker/u4:1: mark_inode_dirty error EXT4-fs (loop4): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs error (device loop4): ext4_find_extent:928: inode #19: comm kworker/u4:1: pblk 208 bad header/extent: invalid magic - magic 6f69, entries 29795, max 9324(0), depth 20297(0) EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4845: inode #19: block 11: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop4): __ext4_get_inode_loc:4409: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop4) in ext4_reserve_inode_write:5869: Corrupt filesystem EXT4-fs error (device loop4): ext4_convert_unwritten_extents:4846: inode #19: comm kworker/u4:1: mark_inode_dirty error EXT4-fs (loop4): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs error (device loop4): ext4_find_extent:928: inode #19: comm kworker/u4:1: pblk 208 bad header/extent: invalid magic - magic 6f69, entries 29795, max 9324(0), depth 20297(0) EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4845: inode #19: block 12: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop4): __ext4_get_inode_loc:4409: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0 EXT4-fs (loop4): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4845: inode #19: block 13: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop4): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4845: inode #19: block 14: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop4): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4845: inode #19: block 15: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop4): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4845: inode #19: block 16: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop4): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4845: inode #19: block 17: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop4): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4845: inode #19: block 18: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop4): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117)