EXT4-fs error (device loop1): ext4_convert_unwritten_extents:4870: inode #19: comm kworker/u4:0: mark_inode_dirty error EXT4-fs (loop1): 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 ffff88812488a784 by task kworker/u4:0/7 CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 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:4160 ext4_map_blocks+0x978/0x1bc0 fs/ext4/inode.c:674 ext4_convert_unwritten_extents+0x21c/0x3f0 fs/ext4/extents.c:4862 ext4_convert_unwritten_io_end_vec+0x103/0x180 fs/ext4/extents.c:4901 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:ffffea0004922280 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x12488a flags: 0x4000000000000000() raw: 4000000000000000 ffffea00049222c8 ffffea00048f9348 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 405, ts 41307899621, free_ts 41479237226 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:5370 __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+0x642/0x930 mm/filemap.c:1848 grab_cache_page_write_begin+0x59/0xb0 mm/filemap.c:3459 ext4_write_begin+0x27b/0x15a0 fs/ext4/inode.c:1208 ext4_da_write_begin+0x455/0xe80 fs/ext4/inode.c:3033 generic_perform_write+0x2be/0x510 mm/filemap.c:3509 ext4_buffered_write_iter+0x4b8/0x640 fs/ext4/file.c:271 ext4_file_write_iter+0x536/0x1980 fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2066 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x725/0xd60 fs/read_write.c:605 ksys_write+0x140/0x240 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+0x31/0x40 arch/x86/entry/common.c:46 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+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 __pagevec_release+0x71/0xe0 mm/swap.c:1123 pagevec_release include/linux/pagevec.h:88 [inline] truncate_inode_pages_range+0x771/0x15b0 mm/truncate.c:367 truncate_inode_pages mm/truncate.c:473 [inline] truncate_inode_pages_final+0xc0/0xd0 mm/truncate.c:524 ext4_evict_inode+0x63a/0x1760 fs/ext4/inode.c:214 evict+0x478/0x910 fs/inode.c:612 dispose_list fs/inode.c:647 [inline] evict_inodes+0x5d4/0x640 fs/inode.c:701 generic_shutdown_super+0x96/0x320 fs/super.c:454 kill_block_super+0x7f/0xf0 fs/super.c:1469 deactivate_locked_super+0xa0/0x100 fs/super.c:335 deactivate_super+0xaf/0xe0 fs/super.c:366 cleanup_mnt+0x446/0x500 fs/namespace.c:1114 __cleanup_mnt+0x19/0x20 fs/namespace.c:1121 task_work_run+0x127/0x190 kernel/task_work.c:189 Memory state around the buggy address: ffff88812488a680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88812488a700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88812488a780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88812488a800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88812488a880: 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 4: comm kworker/u4:0: lblock 4 mapped to illegal pblock 4 (length 1) EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4869: inode #19: block 4: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop1): __ext4_get_inode_loc:4438: comm kworker/u4:0: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop1) in ext4_reserve_inode_write:5933: Corrupt filesystem EXT4-fs error (device loop1): ext4_convert_unwritten_extents:4870: inode #19: comm kworker/u4:0: 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 5: comm kworker/u4:0: lblock 5 mapped to illegal pblock 5 (length 1) EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4869: inode #19: block 5: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop1): __ext4_get_inode_loc:4438: comm kworker/u4:0: Invalid inode table block 34360905424 in block_group 0 EXT4-fs (loop1): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4869: inode #19: block 6: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop1): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4869: inode #19: block 7: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop1): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4869: inode #19: block 8: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop1): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4869: inode #19: block 9: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop1): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4869: inode #19: block 10: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop1): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4869: inode #19: block 11: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop1): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4869: inode #19: block 12: len 1: ext4_ext_map_blocks returned -117 EXT4-fs (loop1): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs error (device loop4): __ext4_get_inode_loc:4438: comm kworker/u4:0: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop0): ext4_map_blocks:740: inode #19: block 230: comm kworker/u4:0: lblock 22 mapped to illegal pblock 230 (length 1) EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4869: inode #19: block 22: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop0): __ext4_get_inode_loc:4438: comm kworker/u4:0: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop0) in ext4_reserve_inode_write:5933: Corrupt filesystem EXT4-fs error (device loop0): ext4_convert_unwritten_extents:4870: inode #19: comm kworker/u4:0: mark_inode_dirty error EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs error (device loop0): ext4_find_extent:928: inode #19: comm kworker/u4:0: pblk 208 bad header/extent: invalid magic - magic 6f69, entries 29795, max 9324(0), depth 20297(0) EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4869: inode #19: block 23: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop0): __ext4_get_inode_loc:4438: comm kworker/u4:0: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop0) in ext4_reserve_inode_write:5933: Corrupt filesystem EXT4-fs error (device loop0): ext4_convert_unwritten_extents:4870: inode #19: comm kworker/u4:0: mark_inode_dirty error EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs error (device loop0): ext4_find_extent:928: inode #19: comm kworker/u4:0: pblk 208 bad header/extent: invalid magic - magic 6f69, entries 29795, max 9324(0), depth 20297(0) EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4869: inode #19: block 24: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop0): __ext4_get_inode_loc:4438: comm kworker/u4:0: Invalid inode table block 34360905424 in block_group 0 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:4869: inode #19: block 25: 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:4869: inode #19: block 26: 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:4869: inode #19: block 27: 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:4869: inode #19: block 28: 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:4869: inode #19: block 29: 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:4869: inode #19: block 30: 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:4869: inode #19: block 31: 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 error (device loop4): __ext4_get_inode_loc:4438: comm kworker/u4:0: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop2): ext4_map_blocks:740: inode #19: block 2975015912: comm kworker/u4:0: lblock 40 mapped to illegal pblock 2975015912 (length 1) EXT4-fs warning (device loop2): ext4_convert_unwritten_extents:4869: inode #19: block 40: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop2): __ext4_get_inode_loc:4438: comm kworker/u4:0: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop2) in ext4_reserve_inode_write:5933: Corrupt filesystem EXT4-fs error (device loop2): ext4_convert_unwritten_extents:4870: inode #19: comm kworker/u4:0: 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/u4:0: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop1): __ext4_get_inode_loc:4438: comm kworker/u4:0: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop1): __ext4_get_inode_loc:4438: comm kworker/u4:0: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop4): __ext4_get_inode_loc:4438: comm kworker/u4:0: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop2): __ext4_get_inode_loc:4438: comm kworker/u4:0: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop3): __ext4_get_inode_loc:4438: comm kworker/u4:0: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop0): ext4_map_blocks:740: inode #19: block 193: comm kworker/u4:0: lblock 1 mapped to illegal pblock 193 (length 1) EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4869: inode #19: block 1: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop0): __ext4_get_inode_loc:4438: comm kworker/u4:0: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop0) in ext4_reserve_inode_write:5933: Corrupt filesystem EXT4-fs error (device loop0): ext4_convert_unwritten_extents:4870: inode #19: comm kworker/u4:0: mark_inode_dirty error EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs error (device loop0): ext4_map_blocks:740: inode #19: block 194: comm kworker/u4:0: lblock 2 mapped to illegal pblock 194 (length 1) EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4869: inode #19: block 2: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop0): __ext4_get_inode_loc:4438: comm kworker/u4:0: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop0) in ext4_reserve_inode_write:5933: Corrupt filesystem EXT4-fs error (device loop0): ext4_convert_unwritten_extents:4870: inode #19: comm kworker/u4:0: mark_inode_dirty error EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs error (device loop0): ext4_find_extent:928: inode #19: comm kworker/u4:0: pblk 208 bad header/extent: invalid magic - magic 6f69, entries 29795, max 9324(0), depth 20297(0) EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4869: 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:4869: 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:4869: 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:4869: 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:4869: 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:4869: inode #19: block 8: 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:4869: inode #19: block 9: len 1: ext4_ext_map_blocks returned -117 EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4869: inode #19: block 10: len 1: ext4_ext_map_blocks returned -117